domi/forgejo-domi
1
0
Fork 0
forked from forgejo/forgejo
Code Pull requests Activity

Vendor Update (#16121)

Browse source 
* update github.com/PuerkitoBio/goquery

* update github.com/alecthomas/chroma

* update github.com/blevesearch/bleve/v2

* update github.com/caddyserver/certmagic

* update github.com/go-enry/go-enry/v2

* update github.com/go-git/go-billy/v5

* update github.com/go-git/go-git/v5

* update github.com/go-redis/redis/v8

* update github.com/go-testfixtures/testfixtures/v3

* update github.com/jaytaylor/html2text

* update github.com/json-iterator/go

* update github.com/klauspost/compress

* update github.com/markbates/goth

* update github.com/mattn/go-isatty

* update github.com/mholt/archiver/v3

* update github.com/microcosm-cc/bluemonday

* update github.com/minio/minio-go/v7

* update github.com/prometheus/client_golang

* update github.com/unrolled/render

* update github.com/xanzy/go-gitlab

* update github.com/yuin/goldmark

* update github.com/yuin/goldmark-highlighting

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
This commit is contained in:
6543 2021-06-10 16:44:25 +02:00 • committed by GitHub
parent f088dc4ea1
commit 86e2789960
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
819 changed files with 38072 additions and 34969 deletions
Download patch file Download diff file Expand all files Collapse all files

153
vendor/github.com/ProtonMail/go-crypto/openpgp/aes/keywrap/keywrap.go generated vendored Normal file
View file

@ -0,0 +1,153 @@
// Copyright 2014 Matthew Endsley
// All rights reserved
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted providing that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
// IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// Package keywrap is an implementation of the RFC 3394 AES key wrapping
// algorithm. This is used in OpenPGP with elliptic curve keys.
package keywrap
import (
"crypto/aes"
"encoding/binary"
"errors"
)
var (
// ErrWrapPlaintext is returned if the plaintext is not a multiple
// of 64 bits.
ErrWrapPlaintext = errors.New("keywrap: plainText must be a multiple of 64 bits")
// ErrUnwrapCiphertext is returned if the ciphertext is not a
// multiple of 64 bits.
ErrUnwrapCiphertext = errors.New("keywrap: cipherText must by a multiple of 64 bits")
// ErrUnwrapFailed is returned if unwrapping a key fails.
ErrUnwrapFailed = errors.New("keywrap: failed to unwrap key")
// NB: the AES NewCipher call only fails if the key is an invalid length.
// ErrInvalidKey is returned when the AES key is invalid.
ErrInvalidKey = errors.New("keywrap: invalid AES key")
)
// Wrap a key using the RFC 3394 AES Key Wrap Algorithm.
func Wrap(key, plainText []byte) ([]byte, error) {
if len(plainText)%8 != 0 {
return nil, ErrWrapPlaintext
}
c, err := aes.NewCipher(key)
if err != nil {
return nil, ErrInvalidKey
}
nblocks := len(plainText) / 8
// 1) Initialize variables.
var block [aes.BlockSize]byte
// - Set A = IV, an initial value (see 2.2.3)
for ii := 0; ii < 8; ii++ {
block[ii] = 0xA6
}
// - For i = 1 to n
// - Set R[i] = P[i]
intermediate := make([]byte, len(plainText))
copy(intermediate, plainText)
// 2) Calculate intermediate values.
for ii := 0; ii < 6; ii++ {
for jj := 0; jj < nblocks; jj++ {
// - B = AES(K, A | R[i])
copy(block[8:], intermediate[jj*8:jj*8+8])
c.Encrypt(block[:], block[:])
// - A = MSB(64, B) ^ t where t = (n*j)+1
t := uint64(ii*nblocks + jj + 1)
val := binary.BigEndian.Uint64(block[:8]) ^ t
binary.BigEndian.PutUint64(block[:8], val)
// - R[i] = LSB(64, B)
copy(intermediate[jj*8:jj*8+8], block[8:])
}
}
// 3) Output results.
// - Set C[0] = A
// - For i = 1 to n
// - C[i] = R[i]
return append(block[:8], intermediate...), nil
}
// Unwrap a key using the RFC 3394 AES Key Wrap Algorithm.
func Unwrap(key, cipherText []byte) ([]byte, error) {
if len(cipherText)%8 != 0 {
return nil, ErrUnwrapCiphertext
}
c, err := aes.NewCipher(key)
if err != nil {
return nil, ErrInvalidKey
}
nblocks := len(cipherText)/8 - 1
// 1) Initialize variables.
var block [aes.BlockSize]byte
// - Set A = C[0]
copy(block[:8], cipherText[:8])
// - For i = 1 to n
// - Set R[i] = C[i]
intermediate := make([]byte, len(cipherText)-8)
copy(intermediate, cipherText[8:])
// 2) Compute intermediate values.
for jj := 5; jj >= 0; jj-- {
for ii := nblocks - 1; ii >= 0; ii-- {
// - B = AES-1(K, (A ^ t) | R[i]) where t = n*j+1
// - A = MSB(64, B)
t := uint64(jj*nblocks + ii + 1)
val := binary.BigEndian.Uint64(block[:8]) ^ t
binary.BigEndian.PutUint64(block[:8], val)
copy(block[8:], intermediate[ii*8:ii*8+8])
c.Decrypt(block[:], block[:])
// - R[i] = LSB(B, 64)
copy(intermediate[ii*8:ii*8+8], block[8:])
}
}
// 3) Output results.
// - If A is an appropriate initial value (see 2.2.3),
for ii := 0; ii < 8; ii++ {
if block[ii] != 0xA6 {
return nil, ErrUnwrapFailed
}
}
// - For i = 1 to n
// - P[i] = R[i]
return intermediate, nil
}

224
vendor/github.com/ProtonMail/go-crypto/openpgp/armor/armor.go generated vendored Normal file
View file

@ -0,0 +1,224 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
// very similar to PEM except that it has an additional CRC checksum.
package armor // import "github.com/ProtonMail/go-crypto/openpgp/armor"
import (
"bufio"
"bytes"
"encoding/base64"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"io"
)
// A Block represents an OpenPGP armored structure.
//
// The encoded form is:
// -----BEGIN Type-----
// Headers
//
// base64-encoded Bytes
// '=' base64 encoded checksum
// -----END Type-----
// where Headers is a possibly empty sequence of Key: Value lines.
//
// Since the armored data can be very large, this package presents a streaming
// interface.
type Block struct {
Type string // The type, taken from the preamble (i.e. "PGP SIGNATURE").
Header map[string]string // Optional headers.
Body io.Reader // A Reader from which the contents can be read
lReader lineReader
oReader openpgpReader
}
var ArmorCorrupt error = errors.StructuralError("armor invalid")
const crc24Init = 0xb704ce
const crc24Poly = 0x1864cfb
const crc24Mask = 0xffffff
// crc24 calculates the OpenPGP checksum as specified in RFC 4880, section 6.1
func crc24(crc uint32, d []byte) uint32 {
for _, b := range d {
crc ^= uint32(b) << 16
for i := 0; i < 8; i++ {
crc <<= 1
if crc&0x1000000 != 0 {
crc ^= crc24Poly
}
}
}
return crc
}
var armorStart = []byte("-----BEGIN ")
var armorEnd = []byte("-----END ")
var armorEndOfLine = []byte("-----")
// lineReader wraps a line based reader. It watches for the end of an armor
// block and records the expected CRC value.
type lineReader struct {
in *bufio.Reader
buf []byte
eof bool
crc uint32
crcSet bool
}
func (l *lineReader) Read(p []byte) (n int, err error) {
if l.eof {
return 0, io.EOF
}
if len(l.buf) > 0 {
n = copy(p, l.buf)
l.buf = l.buf[n:]
return
}
line, isPrefix, err := l.in.ReadLine()
if err != nil {
return
}
if isPrefix {
return 0, ArmorCorrupt
}
if bytes.HasPrefix(line, armorEnd) {
l.eof = true
return 0, io.EOF
}
if len(line) == 5 && line[0] == '=' {
// This is the checksum line
var expectedBytes [3]byte
var m int
m, err = base64.StdEncoding.Decode(expectedBytes[0:], line[1:])
if m != 3 || err != nil {
return
}
l.crc = uint32(expectedBytes[0])<<16 |
uint32(expectedBytes[1])<<8 |
uint32(expectedBytes[2])
line, _, err = l.in.ReadLine()
if err != nil && err != io.EOF {
return
}
if !bytes.HasPrefix(line, armorEnd) {
return 0, ArmorCorrupt
}
l.eof = true
l.crcSet = true
return 0, io.EOF
}
if len(line) > 96 {
return 0, ArmorCorrupt
}
n = copy(p, line)
bytesToSave := len(line) - n
if bytesToSave > 0 {
if cap(l.buf) < bytesToSave {
l.buf = make([]byte, 0, bytesToSave)
}
l.buf = l.buf[0:bytesToSave]
copy(l.buf, line[n:])
}
return
}
// openpgpReader passes Read calls to the underlying base64 decoder, but keeps
// a running CRC of the resulting data and checks the CRC against the value
// found by the lineReader at EOF.
type openpgpReader struct {
lReader *lineReader
b64Reader io.Reader
currentCRC uint32
}
func (r *openpgpReader) Read(p []byte) (n int, err error) {
n, err = r.b64Reader.Read(p)
r.currentCRC = crc24(r.currentCRC, p[:n])
if err == io.EOF && r.lReader.crcSet && r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
return 0, ArmorCorrupt
}
return
}
// Decode reads a PGP armored block from the given Reader. It will ignore
// leading garbage. If it doesn't find a block, it will return nil, io.EOF. The
// given Reader is not usable after calling this function: an arbitrary amount
// of data may have been read past the end of the block.
func Decode(in io.Reader) (p *Block, err error) {
r := bufio.NewReaderSize(in, 100)
var line []byte
ignoreNext := false
TryNextBlock:
p = nil
// Skip leading garbage
for {
ignoreThis := ignoreNext
line, ignoreNext, err = r.ReadLine()
if err != nil {
return
}
if ignoreNext || ignoreThis {
continue
}
line = bytes.TrimSpace(line)
if len(line) > len(armorStart)+len(armorEndOfLine) && bytes.HasPrefix(line, armorStart) {
break
}
}
p = new(Block)
p.Type = string(line[len(armorStart) : len(line)-len(armorEndOfLine)])
p.Header = make(map[string]string)
nextIsContinuation := false
var lastKey string
// Read headers
for {
isContinuation := nextIsContinuation
line, nextIsContinuation, err = r.ReadLine()
if err != nil {
p = nil
return
}
if isContinuation {
p.Header[lastKey] += string(line)
continue
}
line = bytes.TrimSpace(line)
if len(line) == 0 {
break
}
i := bytes.Index(line, []byte(": "))
if i == -1 {
goto TryNextBlock
}
lastKey = string(line[:i])
p.Header[lastKey] = string(line[i+2:])
}
p.lReader.in = r
p.oReader.currentCRC = crc24Init
p.oReader.lReader = &p.lReader
p.oReader.b64Reader = base64.NewDecoder(base64.StdEncoding, &p.lReader)
p.Body = &p.oReader
return
}

160
vendor/github.com/ProtonMail/go-crypto/openpgp/armor/encode.go generated vendored Normal file
View file

@ -0,0 +1,160 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package armor
import (
"encoding/base64"
"io"
)
var armorHeaderSep = []byte(": ")
var blockEnd = []byte("\n=")
var newline = []byte("\n")
var armorEndOfLineOut = []byte("-----\n")
// writeSlices writes its arguments to the given Writer.
func writeSlices(out io.Writer, slices ...[]byte) (err error) {
for _, s := range slices {
_, err = out.Write(s)
if err != nil {
return err
}
}
return
}
// lineBreaker breaks data across several lines, all of the same byte length
// (except possibly the last). Lines are broken with a single '\n'.
type lineBreaker struct {
lineLength int
line []byte
used int
out io.Writer
haveWritten bool
}
func newLineBreaker(out io.Writer, lineLength int) *lineBreaker {
return &lineBreaker{
lineLength: lineLength,
line: make([]byte, lineLength),
used: 0,
out: out,
}
}
func (l *lineBreaker) Write(b []byte) (n int, err error) {
n = len(b)
if n == 0 {
return
}
if l.used == 0 && l.haveWritten {
_, err = l.out.Write([]byte{'\n'})
if err != nil {
return
}
}
if l.used+len(b) < l.lineLength {
l.used += copy(l.line[l.used:], b)
return
}
l.haveWritten = true
_, err = l.out.Write(l.line[0:l.used])
if err != nil {
return
}
excess := l.lineLength - l.used
l.used = 0
_, err = l.out.Write(b[0:excess])
if err != nil {
return
}
_, err = l.Write(b[excess:])
return
}
func (l *lineBreaker) Close() (err error) {
if l.used > 0 {
_, err = l.out.Write(l.line[0:l.used])
if err != nil {
return
}
}
return
}
// encoding keeps track of a running CRC24 over the data which has been written
// to it and outputs a OpenPGP checksum when closed, followed by an armor
// trailer.
//
// It's built into a stack of io.Writers:
// encoding -> base64 encoder -> lineBreaker -> out
type encoding struct {
out io.Writer
breaker *lineBreaker
b64 io.WriteCloser
crc uint32
blockType []byte
}
func (e *encoding) Write(data []byte) (n int, err error) {
e.crc = crc24(e.crc, data)
return e.b64.Write(data)
}
func (e *encoding) Close() (err error) {
err = e.b64.Close()
if err != nil {
return
}
e.breaker.Close()
var checksumBytes [3]byte
checksumBytes[0] = byte(e.crc >> 16)
checksumBytes[1] = byte(e.crc >> 8)
checksumBytes[2] = byte(e.crc)
var b64ChecksumBytes [4]byte
base64.StdEncoding.Encode(b64ChecksumBytes[:], checksumBytes[:])
return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine)
}
// Encode returns a WriteCloser which will encode the data written to it in
// OpenPGP armor.
func Encode(out io.Writer, blockType string, headers map[string]string) (w io.WriteCloser, err error) {
bType := []byte(blockType)
err = writeSlices(out, armorStart, bType, armorEndOfLineOut)
if err != nil {
return
}
for k, v := range headers {
err = writeSlices(out, []byte(k), armorHeaderSep, []byte(v), newline)
if err != nil {
return
}
}
_, err = out.Write(newline)
if err != nil {
return
}
e := &encoding{
out: out,
breaker: newLineBreaker(out, 64),
crc: crc24Init,
blockType: bType,
}
e.b64 = base64.NewEncoder(base64.StdEncoding, e.breaker)
return e, nil
}

65
vendor/github.com/ProtonMail/go-crypto/openpgp/canonical_text.go generated vendored Normal file
View file

@ -0,0 +1,65 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
"hash"
"io"
)
// NewCanonicalTextHash reformats text written to it into the canonical
// form and then applies the hash h. See RFC 4880, section 5.2.1.
func NewCanonicalTextHash(h hash.Hash) hash.Hash {
return &canonicalTextHash{h, 0}
}
type canonicalTextHash struct {
h hash.Hash
s int
}
var newline = []byte{'\r', '\n'}
func writeCanonical(cw io.Writer, buf []byte, s *int) (int, error) {
start := 0
for i, c := range buf {
switch *s {
case 0:
if c == '\r' {
*s = 1
} else if c == '\n' {
cw.Write(buf[start:i])
cw.Write(newline)
start = i + 1
}
case 1:
*s = 0
}
}
cw.Write(buf[start:])
return len(buf), nil
}
func (cth *canonicalTextHash) Write(buf []byte) (int, error) {
return writeCanonical(cth.h, buf, &cth.s)
}
func (cth *canonicalTextHash) Sum(in []byte) []byte {
return cth.h.Sum(in)
}
func (cth *canonicalTextHash) Reset() {
cth.h.Reset()
cth.s = 0
}
func (cth *canonicalTextHash) Size() int {
return cth.h.Size()
}
func (cth *canonicalTextHash) BlockSize() int {
return cth.h.BlockSize()
}

165
vendor/github.com/ProtonMail/go-crypto/openpgp/ecdh/ecdh.go generated vendored Normal file
View file

@ -0,0 +1,165 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package ecdh implements ECDH encryption, suitable for OpenPGP,
// as specified in RFC 6637, section 8.
package ecdh
import (
"bytes"
"crypto/elliptic"
"errors"
"io"
"math/big"
"github.com/ProtonMail/go-crypto/openpgp/aes/keywrap"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
)
type KDF struct {
Hash algorithm.Hash
Cipher algorithm.Cipher
}
type PublicKey struct {
ecc.CurveType
elliptic.Curve
X, Y *big.Int
KDF
}
type PrivateKey struct {
PublicKey
D []byte
}
func GenerateKey(c elliptic.Curve, kdf KDF, rand io.Reader) (priv *PrivateKey, err error) {
priv = new(PrivateKey)
priv.PublicKey.Curve = c
priv.PublicKey.KDF = kdf
priv.D, priv.PublicKey.X, priv.PublicKey.Y, err = elliptic.GenerateKey(c, rand)
return
}
func Encrypt(random io.Reader, pub *PublicKey, msg, curveOID, fingerprint []byte) (vsG, c []byte, err error) {
if len(msg) > 40 {
return nil, nil, errors.New("ecdh: message too long")
}
// the sender MAY use 21, 13, and 5 bytes of padding for AES-128,
// AES-192, and AES-256, respectively, to provide the same number of
// octets, 40 total, as an input to the key wrapping method.
padding := make([]byte, 40-len(msg))
for i := range padding {
padding[i] = byte(40 - len(msg))
}
m := append(msg, padding...)
if pub.CurveType == ecc.Curve25519 {
return X25519Encrypt(random, pub, m, curveOID, fingerprint)
}
d, x, y, err := elliptic.GenerateKey(pub.Curve, random)
if err != nil {
return nil, nil, err
}
vsG = elliptic.Marshal(pub.Curve, x, y)
zbBig, _ := pub.Curve.ScalarMult(pub.X, pub.Y, d)
byteLen := (pub.Curve.Params().BitSize + 7) >> 3
zb := make([]byte, byteLen)
zbBytes := zbBig.Bytes()
copy(zb[byteLen-len(zbBytes):], zbBytes)
z, err := buildKey(pub, zb, curveOID, fingerprint, false, false)
if err != nil {
return nil, nil, err
}
if c, err = keywrap.Wrap(z, m); err != nil {
return nil, nil, err
}
return vsG, c, nil
}
func Decrypt(priv *PrivateKey, vsG, m, curveOID, fingerprint []byte) (msg []byte, err error) {
if priv.PublicKey.CurveType == ecc.Curve25519 {
return X25519Decrypt(priv, vsG, m, curveOID, fingerprint)
}
x, y := elliptic.Unmarshal(priv.Curve, vsG)
zbBig, _ := priv.Curve.ScalarMult(x, y, priv.D)
byteLen := (priv.Curve.Params().BitSize + 7) >> 3
zb := make([]byte, byteLen)
zbBytes := zbBig.Bytes()
copy(zb[byteLen-len(zbBytes):], zbBytes)
z, err := buildKey(&priv.PublicKey, zb, curveOID, fingerprint, false, false)
if err != nil {
return nil, err
}
c, err := keywrap.Unwrap(z, m)
if err != nil {
return nil, err
}
return c[:len(c)-int(c[len(c)-1])], nil
}
func buildKey(pub *PublicKey, zb []byte, curveOID, fingerprint []byte, stripLeading, stripTrailing bool) ([]byte, error) {
// Param = curve_OID_len || curve_OID || public_key_alg_ID || 03
// || 01 || KDF_hash_ID || KEK_alg_ID for AESKeyWrap
// || "Anonymous Sender " || recipient_fingerprint;
param := new(bytes.Buffer)
if _, err := param.Write(curveOID); err != nil {
return nil, err
}
algKDF := []byte{18, 3, 1, pub.KDF.Hash.Id(), pub.KDF.Cipher.Id()}
if _, err := param.Write(algKDF); err != nil {
return nil, err
}
if _, err := param.Write([]byte("Anonymous Sender ")); err != nil {
return nil, err
}
// For v5 keys, the 20 leftmost octets of the fingerprint are used.
if _, err := param.Write(fingerprint[:20]); err != nil {
return nil, err
}
if param.Len() - len(curveOID) != 45 {
return nil, errors.New("ecdh: malformed KDF Param")
}
// MB = Hash ( 00 || 00 || 00 || 01 || ZB || Param );
h := pub.KDF.Hash.New()
if _, err := h.Write([]byte{0x0, 0x0, 0x0, 0x1}); err != nil {
return nil, err
}
zbLen := len(zb)
i := 0
j := zbLen - 1
if stripLeading {
// Work around old go crypto bug where the leading zeros are missing.
for ; i < zbLen && zb[i] == 0; i++ {}
}
if stripTrailing {
// Work around old OpenPGP.js bug where insignificant trailing zeros in
// this little-endian number are missing.
// (See https://github.com/openpgpjs/openpgpjs/pull/853.)
for ; j >= 0 && zb[j] == 0; j-- {}
}
if _, err := h.Write(zb[i:j+1]); err != nil {
return nil, err
}
if _, err := h.Write(param.Bytes()); err != nil {
return nil, err
}
mb := h.Sum(nil)
return mb[:pub.KDF.Cipher.KeySize()], nil // return oBits leftmost bits of MB.
}

157
vendor/github.com/ProtonMail/go-crypto/openpgp/ecdh/x25519.go generated vendored Normal file
View file

@ -0,0 +1,157 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package ecdh implements ECDH encryption, suitable for OpenPGP,
// as specified in RFC 6637, section 8.
package ecdh
import (
"errors"
"io"
"math/big"
"github.com/ProtonMail/go-crypto/openpgp/aes/keywrap"
"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
"golang.org/x/crypto/curve25519"
)
// Generates a private-public key-pair.
// 'priv' is a private key; a scalar belonging to the set
// 2^{254} + 8 * [0, 2^{251}), in order to avoid the small subgroup of the
// curve. 'pub' is simply 'priv' * G where G is the base point.
// See https://cr.yp.to/ecdh.html and RFC7748, sec 5.
func x25519GenerateKeyPairBytes(rand io.Reader) (priv [32]byte, pub [32]byte, err error) {
var n, helper = new(big.Int), new(big.Int)
n.SetUint64(1)
n.Lsh(n, 252)
helper.SetString("27742317777372353535851937790883648493", 10)
n.Add(n, helper)
for true {
_, err = io.ReadFull(rand, priv[:])
if err != nil {
return
}
// The following ensures that the private key is a number of the form
// 2^{254} + 8 * [0, 2^{251}), in order to avoid the small subgroup of
// of the curve.
priv[0] &= 248
priv[31] &= 127
priv[31] |= 64
// If the scalar is out of range, sample another random number.
if new(big.Int).SetBytes(priv[:]).Cmp(n) >= 0 {
continue
}
curve25519.ScalarBaseMult(&pub, &priv)
return
}
return
}
// X25519GenerateKey samples the key pair according to the correct distribution.
// It also sets the given key-derivation function and returns the *PrivateKey
// object along with an error.
func X25519GenerateKey(rand io.Reader, kdf KDF) (priv *PrivateKey, err error) {
ci := ecc.FindByName("Curve25519")
priv = new(PrivateKey)
priv.PublicKey.Curve = ci.Curve
d, pubKey, err := x25519GenerateKeyPairBytes(rand)
if err != nil {
return nil, err
}
priv.PublicKey.KDF = kdf
priv.D = make([]byte, 32)
copyReversed(priv.D, d[:])
priv.PublicKey.CurveType = ci.CurveType
priv.PublicKey.Curve = ci.Curve
/*
* Note that ECPoint.point differs from the definition of public keys in
* [Curve25519] in two ways: (1) the byte-ordering is big-endian, which is
* more uniform with how big integers are represented in TLS, and (2) there
* is an additional length byte (so ECpoint.point is actually 33 bytes),
* again for uniformity (and extensibility).
*/
var encodedKey = make([]byte, 33)
encodedKey[0] = 0x40
copy(encodedKey[1:], pubKey[:])
priv.PublicKey.X = new(big.Int).SetBytes(encodedKey[:])
priv.PublicKey.Y = new(big.Int)
return priv, nil
}
func X25519Encrypt(random io.Reader, pub *PublicKey, msg, curveOID, fingerprint []byte) (vsG, c []byte, err error) {
d, ephemeralKey, err := x25519GenerateKeyPairBytes(random)
if err != nil {
return nil, nil, err
}
var pubKey [32]byte
if pub.X.BitLen() > 33*264 {
return nil, nil, errors.New("ecdh: invalid key")
}
copy(pubKey[:], pub.X.Bytes()[1:])
var zb [32]byte
curve25519.ScalarBaseMult(&zb, &d)
curve25519.ScalarMult(&zb, &d, &pubKey)
z, err := buildKey(pub, zb[:], curveOID, fingerprint, false, false)
if err != nil {
return nil, nil, err
}
if c, err = keywrap.Wrap(z, msg); err != nil {
return nil, nil, err
}
var vsg [33]byte
vsg[0] = 0x40
copy(vsg[1:], ephemeralKey[:])
return vsg[:], c, nil
}
func X25519Decrypt(priv *PrivateKey, vsG, m, curveOID, fingerprint []byte) (msg []byte, err error) {
var zb, d, ephemeralKey [32]byte
if len(vsG) != 33 || vsG[0] != 0x40 {
return nil, errors.New("ecdh: invalid key")
}
copy(ephemeralKey[:], vsG[1:33])
copyReversed(d[:], priv.D)
curve25519.ScalarBaseMult(&zb, &d)
curve25519.ScalarMult(&zb, &d, &ephemeralKey)
var c []byte
for i := 0; i < 3; i++ {
// Try buildKey three times for compat, see comments in buildKey.
z, err := buildKey(&priv.PublicKey, zb[:], curveOID, fingerprint, i == 1, i == 2)
if err != nil {
return nil, err
}
res, err := keywrap.Unwrap(z, m)
if i == 2 && err != nil {
// Only return an error after we've tried all variants of buildKey.
return nil, err
}
c = res
if err == nil {
break
}
}
return c[:len(c)-int(c[len(c)-1])], nil
}
func copyReversed(out []byte, in []byte) {
l := len(in)
for i := 0; i < l; i++ {
out[i] = in[l-i-1]
}
}

124
vendor/github.com/ProtonMail/go-crypto/openpgp/elgamal/elgamal.go generated vendored Normal file
View file

@ -0,0 +1,124 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package elgamal implements ElGamal encryption, suitable for OpenPGP,
// as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on
// Discrete Logarithms," IEEE Transactions on Information Theory, v. IT-31,
// n. 4, 1985, pp. 469-472.
//
// This form of ElGamal embeds PKCS#1 v1.5 padding, which may make it
// unsuitable for other protocols. RSA should be used in preference in any
// case.
package elgamal // import "github.com/ProtonMail/go-crypto/openpgp/elgamal"
import (
"crypto/rand"
"crypto/subtle"
"errors"
"io"
"math/big"
)
// PublicKey represents an ElGamal public key.
type PublicKey struct {
G, P, Y *big.Int
}
// PrivateKey represents an ElGamal private key.
type PrivateKey struct {
PublicKey
X *big.Int
}
// Encrypt encrypts the given message to the given public key. The result is a
// pair of integers. Errors can result from reading random, or because msg is
// too large to be encrypted to the public key.
func Encrypt(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err error) {
pLen := (pub.P.BitLen() + 7) / 8
if len(msg) > pLen-11 {
err = errors.New("elgamal: message too long")
return
}
// EM = 0x02 || PS || 0x00 || M
em := make([]byte, pLen-1)
em[0] = 2
ps, mm := em[1:len(em)-len(msg)-1], em[len(em)-len(msg):]
err = nonZeroRandomBytes(ps, random)
if err != nil {
return
}
em[len(em)-len(msg)-1] = 0
copy(mm, msg)
m := new(big.Int).SetBytes(em)
k, err := rand.Int(random, pub.P)
if err != nil {
return
}
c1 = new(big.Int).Exp(pub.G, k, pub.P)
s := new(big.Int).Exp(pub.Y, k, pub.P)
c2 = s.Mul(s, m)
c2.Mod(c2, pub.P)
return
}
// Decrypt takes two integers, resulting from an ElGamal encryption, and
// returns the plaintext of the message. An error can result only if the
// ciphertext is invalid. Users should keep in mind that this is a padding
// oracle and thus, if exposed to an adaptive chosen ciphertext attack, can
// be used to break the cryptosystem. See ``Chosen Ciphertext Attacks
// Against Protocols Based on the RSA Encryption Standard PKCS #1'', Daniel
// Bleichenbacher, Advances in Cryptology (Crypto '98),
func Decrypt(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error) {
s := new(big.Int).Exp(c1, priv.X, priv.P)
if s.ModInverse(s, priv.P) == nil {
return nil, errors.New("elgamal: invalid private key")
}
s.Mul(s, c2)
s.Mod(s, priv.P)
em := s.Bytes()
firstByteIsTwo := subtle.ConstantTimeByteEq(em[0], 2)
// The remainder of the plaintext must be a string of non-zero random
// octets, followed by a 0, followed by the message.
// lookingForIndex: 1 iff we are still looking for the zero.
// index: the offset of the first zero byte.
var lookingForIndex, index int
lookingForIndex = 1
for i := 1; i < len(em); i++ {
equals0 := subtle.ConstantTimeByteEq(em[i], 0)
index = subtle.ConstantTimeSelect(lookingForIndex&equals0, i, index)
lookingForIndex = subtle.ConstantTimeSelect(equals0, 0, lookingForIndex)
}
if firstByteIsTwo != 1 || lookingForIndex != 0 || index < 9 {
return nil, errors.New("elgamal: decryption error")
}
return em[index+1:], nil
}
// nonZeroRandomBytes fills the given slice with non-zero random octets.
func nonZeroRandomBytes(s []byte, rand io.Reader) (err error) {
_, err = io.ReadFull(rand, s)
if err != nil {
return
}
for i := 0; i < len(s); i++ {
for s[i] == 0 {
_, err = io.ReadFull(rand, s[i:i+1])
if err != nil {
return
}
}
}
return
}

116
vendor/github.com/ProtonMail/go-crypto/openpgp/errors/errors.go generated vendored Normal file
View file

@ -0,0 +1,116 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package errors contains common error types for the OpenPGP packages.
package errors // import "github.com/ProtonMail/go-crypto/openpgp/errors"
import (
"strconv"
)
// A StructuralError is returned when OpenPGP data is found to be syntactically
// invalid.
type StructuralError string
func (s StructuralError) Error() string {
return "openpgp: invalid data: " + string(s)
}
// UnsupportedError indicates that, although the OpenPGP data is valid, it
// makes use of currently unimplemented features.
type UnsupportedError string
func (s UnsupportedError) Error() string {
return "openpgp: unsupported feature: " + string(s)
}
// InvalidArgumentError indicates that the caller is in error and passed an
// incorrect value.
type InvalidArgumentError string
func (i InvalidArgumentError) Error() string {
return "openpgp: invalid argument: " + string(i)
}
// SignatureError indicates that a syntactically valid signature failed to
// validate.
type SignatureError string
func (b SignatureError) Error() string {
return "openpgp: invalid signature: " + string(b)
}
var ErrMDCHashMismatch error = SignatureError("MDC hash mismatch")
var ErrMDCMissing error = SignatureError("MDC packet not found")
type signatureExpiredError int
func (se signatureExpiredError) Error() string {
return "openpgp: signature expired"
}
var ErrSignatureExpired error = signatureExpiredError(0)
type keyExpiredError int
func (ke keyExpiredError) Error() string {
return "openpgp: key expired"
}
var ErrKeyExpired error = keyExpiredError(0)
type keyIncorrectError int
func (ki keyIncorrectError) Error() string {
return "openpgp: incorrect key"
}
var ErrKeyIncorrect error = keyIncorrectError(0)
// KeyInvalidError indicates that the public key parameters are invalid
// as they do not match the private ones
type KeyInvalidError string
func (e KeyInvalidError) Error() string {
return "openpgp: invalid key: " + string(e)
}
type unknownIssuerError int
func (unknownIssuerError) Error() string {
return "openpgp: signature made by unknown entity"
}
var ErrUnknownIssuer error = unknownIssuerError(0)
type keyRevokedError int
func (keyRevokedError) Error() string {
return "openpgp: signature made by revoked key"
}
var ErrKeyRevoked error = keyRevokedError(0)
type UnknownPacketTypeError uint8
func (upte UnknownPacketTypeError) Error() string {
return "openpgp: unknown packet type: " + strconv.Itoa(int(upte))
}
// AEADError indicates that there is a problem when initializing or using a
// AEAD instance, configuration struct, nonces or index values.
type AEADError string
func (ae AEADError) Error() string {
return "openpgp: aead error: " + string(ae)
}
// ErrDummyPrivateKey results when operations are attempted on a private key
// that is just a dummy key. See
// https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/DETAILS;h=fe55ae16ab4e26d8356dc574c9e8bc935e71aef1;hb=23191d7851eae2217ecdac6484349849a24fd94a#l1109
type ErrDummyPrivateKey string
func (dke ErrDummyPrivateKey) Error() string {
return "openpgp: s2k GNU dummy key: " + string(dke)
}

65
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/algorithm/aead.go generated vendored Normal file
View file

@ -0,0 +1,65 @@
// Copyright (C) 2019 ProtonTech AG
package algorithm
import (
"crypto/cipher"
"github.com/ProtonMail/go-crypto/eax"
"github.com/ProtonMail/go-crypto/ocb"
)
// AEADMode defines the Authenticated Encryption with Associated Data mode of
// operation.
type AEADMode uint8
// Supported modes of operation (see RFC4880bis [EAX] and RFC7253)
const (
AEADModeEAX = AEADMode(1)
AEADModeOCB = AEADMode(2)
AEADModeGCM = AEADMode(100)
)
// TagLength returns the length in bytes of authentication tags.
func (mode AEADMode) TagLength() int {
switch mode {
case AEADModeEAX:
return 16
case AEADModeOCB:
return 16
case AEADModeGCM:
return 16
default:
return 0
}
}
// NonceLength returns the length in bytes of nonces.
func (mode AEADMode) NonceLength() int {
switch mode {
case AEADModeEAX:
return 16
case AEADModeOCB:
return 15
case AEADModeGCM:
return 12
default:
return 0
}
}
// New returns a fresh instance of the given mode
func (mode AEADMode) New(block cipher.Block) (alg cipher.AEAD) {
var err error
switch mode {
case AEADModeEAX:
alg, err = eax.NewEAX(block)
case AEADModeOCB:
alg, err = ocb.NewOCB(block)
case AEADModeGCM:
alg, err = cipher.NewGCM(block)
}
if err != nil {
panic(err.Error())
}
return alg
}

107
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/algorithm/cipher.go generated vendored Normal file
View file

@ -0,0 +1,107 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package algorithm
import (
"crypto/aes"
"crypto/cipher"
"crypto/des"
"golang.org/x/crypto/cast5"
)
// Cipher is an official symmetric key cipher algorithm. See RFC 4880,
// section 9.2.
type Cipher interface {
// Id returns the algorithm ID, as a byte, of the cipher.
Id() uint8
// KeySize returns the key size, in bytes, of the cipher.
KeySize() int
// BlockSize returns the block size, in bytes, of the cipher.
BlockSize() int
// New returns a fresh instance of the given cipher.
New(key []byte) cipher.Block
}
// The following constants mirror the OpenPGP standard (RFC 4880).
const (
TripleDES = CipherFunction(2)
CAST5 = CipherFunction(3)
AES128 = CipherFunction(7)
AES192 = CipherFunction(8)
AES256 = CipherFunction(9)
)
// CipherById represents the different block ciphers specified for OpenPGP. See
// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-13
var CipherById = map[uint8]Cipher{
TripleDES.Id(): TripleDES,
CAST5.Id(): CAST5,
AES128.Id(): AES128,
AES192.Id(): AES192,
AES256.Id(): AES256,
}
type CipherFunction uint8
// ID returns the algorithm Id, as a byte, of cipher.
func (sk CipherFunction) Id() uint8 {
return uint8(sk)
}
var keySizeByID = map[uint8]int{
TripleDES.Id(): 24,
CAST5.Id(): cast5.KeySize,
AES128.Id(): 16,
AES192.Id(): 24,
AES256.Id(): 32,
}
// KeySize returns the key size, in bytes, of cipher.
func (cipher CipherFunction) KeySize() int {
switch cipher {
case TripleDES:
return 24
case CAST5:
return cast5.KeySize
case AES128:
return 16
case AES192:
return 24
case AES256:
return 32
}
return 0
}
// BlockSize returns the block size, in bytes, of cipher.
func (cipher CipherFunction) BlockSize() int {
switch cipher {
case TripleDES:
return des.BlockSize
case CAST5:
return 8
case AES128, AES192, AES256:
return 16
}
return 0
}
// New returns a fresh instance of the given cipher.
func (cipher CipherFunction) New(key []byte) (block cipher.Block) {
var err error
switch cipher {
case TripleDES:
block, err = des.NewTripleDESCipher(key)
case CAST5:
block, err = cast5.NewCipher(key)
case AES128, AES192, AES256:
block, err = aes.NewCipher(key)
}
if err != nil {
panic(err.Error())
}
return
}

86
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/algorithm/hash.go generated vendored Normal file
View file

@ -0,0 +1,86 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package algorithm
import (
"crypto"
"fmt"
"hash"
)
// Hash is an official hash function algorithm. See RFC 4880, section 9.4.
type Hash interface {
// Id returns the algorithm ID, as a byte, of Hash.
Id() uint8
// Available reports whether the given hash function is linked into the binary.
Available() bool
// HashFunc simply returns the value of h so that Hash implements SignerOpts.
HashFunc() crypto.Hash
// New returns a new hash.Hash calculating the given hash function. New
// panics if the hash function is not linked into the binary.
New() hash.Hash
// Size returns the length, in bytes, of a digest resulting from the given
// hash function. It doesn't require that the hash function in question be
// linked into the program.
Size() int
// String is the name of the hash function corresponding to the given
// OpenPGP hash id.
String() string
}
// The following vars mirror the crypto/Hash supported hash functions.
var (
MD5 Hash = cryptoHash{1, crypto.MD5}
SHA1 Hash = cryptoHash{2, crypto.SHA1}
RIPEMD160 Hash = cryptoHash{3, crypto.RIPEMD160}
SHA256 Hash = cryptoHash{8, crypto.SHA256}
SHA384 Hash = cryptoHash{9, crypto.SHA384}
SHA512 Hash = cryptoHash{10, crypto.SHA512}
SHA224 Hash = cryptoHash{11, crypto.SHA224}
)
// HashById represents the different hash functions specified for OpenPGP. See
// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-14
var (
HashById = map[uint8]Hash{
MD5.Id(): MD5,
SHA1.Id(): SHA1,
RIPEMD160.Id(): RIPEMD160,
SHA256.Id(): SHA256,
SHA384.Id(): SHA384,
SHA512.Id(): SHA512,
SHA224.Id(): SHA224,
}
)
// cryptoHash contains pairs relating OpenPGP's hash identifier with
// Go's crypto.Hash type. See RFC 4880, section 9.4.
type cryptoHash struct {
id uint8
crypto.Hash
}
// Id returns the algorithm ID, as a byte, of cryptoHash.
func (h cryptoHash) Id() uint8 {
return h.id
}
var hashNames = map[uint8]string{
MD5.Id(): "MD5",
SHA1.Id(): "SHA1",
RIPEMD160.Id(): "RIPEMD160",
SHA256.Id(): "SHA256",
SHA384.Id(): "SHA384",
SHA512.Id(): "SHA512",
SHA224.Id(): "SHA224",
}
func (h cryptoHash) String() string {
s, ok := hashNames[h.id]
if !ok {
panic(fmt.Sprintf("Unsupported hash function %d", h.id))
}
return s
}

118
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/ecc/curveInfo.go generated vendored Normal file
View file

@ -0,0 +1,118 @@
package ecc
import (
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
"crypto/elliptic"
"bytes"
"github.com/ProtonMail/go-crypto/bitcurves"
"github.com/ProtonMail/go-crypto/brainpool"
)
type SignatureAlgorithm uint8
const (
ECDSA SignatureAlgorithm = 1
EdDSA SignatureAlgorithm = 2
)
type CurveInfo struct {
Name string
Oid *encoding.OID
Curve elliptic.Curve
SigAlgorithm SignatureAlgorithm
CurveType CurveType
}
var curves = []CurveInfo{
{
Name: "NIST curve P-256",
Oid: encoding.NewOID([]byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07}),
Curve: elliptic.P256(),
CurveType: NISTCurve,
SigAlgorithm: ECDSA,
},
{
Name: "NIST curve P-384",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x22}),
Curve: elliptic.P384(),
CurveType: NISTCurve,
SigAlgorithm: ECDSA,
},
{
Name: "NIST curve P-521",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x23}),
Curve: elliptic.P521(),
CurveType: NISTCurve,
SigAlgorithm: ECDSA,
},
{
Name: "SecP256k1",
Oid: encoding.NewOID([]byte{0x2B, 0x81, 0x04, 0x00, 0x0A}),
Curve: bitcurves.S256(),
CurveType: BitCurve,
SigAlgorithm: ECDSA,
},
{
Name: "Curve25519",
Oid: encoding.NewOID([]byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01}),
Curve: elliptic.P256(),// filler
CurveType: Curve25519,
SigAlgorithm: ECDSA,
},
{
Name: "Ed25519",
Oid: encoding.NewOID([]byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0xDA, 0x47, 0x0F, 0x01}),
Curve: elliptic.P256(), // filler
CurveType: NISTCurve,
SigAlgorithm: EdDSA,
},
{
Name: "Brainpool P256r1",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x07}),
Curve: brainpool.P256r1(),
CurveType: BrainpoolCurve,
SigAlgorithm: ECDSA,
},
{
Name: "BrainpoolP384r1",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0B}),
Curve: brainpool.P384r1(),
CurveType: BrainpoolCurve,
SigAlgorithm: ECDSA,
},
{
Name: "BrainpoolP512r1",
Oid: encoding.NewOID([]byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0D}),
Curve: brainpool.P512r1(),
CurveType: BrainpoolCurve,
SigAlgorithm: ECDSA,
},
}
func FindByCurve(curve elliptic.Curve) *CurveInfo {
for _, curveInfo := range curves {
if curveInfo.Curve == curve {
return &curveInfo
}
}
return nil
}
func FindByOid(oid encoding.Field) *CurveInfo {
var rawBytes = oid.Bytes()
for _, curveInfo := range curves {
if bytes.Equal(curveInfo.Oid.Bytes(), rawBytes) {
return &curveInfo
}
}
return nil
}
func FindByName(name string) *CurveInfo {
for _, curveInfo := range curves {
if curveInfo.Name == name {
return &curveInfo
}
}
return nil
}

10
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/ecc/curveType.go generated vendored Normal file
View file

@ -0,0 +1,10 @@
package ecc
type CurveType uint8
const (
NISTCurve CurveType = 1
Curve25519 CurveType = 2
BitCurve CurveType = 3
BrainpoolCurve CurveType = 4
)

27
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/encoding/encoding.go generated vendored Normal file
View file

@ -0,0 +1,27 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package encoding implements openpgp packet field encodings as specified in
// RFC 4880 and 6637.
package encoding
import "io"
// Field is an encoded field of an openpgp packet.
type Field interface {
// Bytes returns the decoded data.
Bytes() []byte
// BitLength is the size in bits of the decoded data.
BitLength() uint16
// EncodedBytes returns the encoded data.
EncodedBytes() []byte
// EncodedLength is the size in bytes of the encoded data.
EncodedLength() uint16
// ReadFrom reads the next Field from r.
ReadFrom(r io.Reader) (int64, error)
}

91
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/encoding/mpi.go generated vendored Normal file
View file

@ -0,0 +1,91 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package encoding
import (
"io"
"math/big"
"math/bits"
)
// An MPI is used to store the contents of a big integer, along with the bit
// length that was specified in the original input. This allows the MPI to be
// reserialized exactly.
type MPI struct {
bytes []byte
bitLength uint16
}
// NewMPI returns a MPI initialized with bytes.
func NewMPI(bytes []byte) *MPI {
for len(bytes) != 0 && bytes[0] == 0 {
bytes = bytes[1:]
}
if len(bytes) == 0 {
bitLength := uint16(0)
return &MPI{bytes, bitLength}
}
bitLength := 8*uint16(len(bytes)-1) + uint16(bits.Len8(bytes[0]))
return &MPI{bytes, bitLength}
}
// Bytes returns the decoded data.
func (m *MPI) Bytes() []byte {
return m.bytes
}
// BitLength is the size in bits of the decoded data.
func (m *MPI) BitLength() uint16 {
return m.bitLength
}
// EncodedBytes returns the encoded data.
func (m *MPI) EncodedBytes() []byte {
return append([]byte{byte(m.bitLength >> 8), byte(m.bitLength)}, m.bytes...)
}
// EncodedLength is the size in bytes of the encoded data.
func (m *MPI) EncodedLength() uint16 {
return uint16(2 + len(m.bytes))
}
// ReadFrom reads into m the next MPI from r.
func (m *MPI) ReadFrom(r io.Reader) (int64, error) {
var buf [2]byte
n, err := io.ReadFull(r, buf[0:])
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return int64(n), err
}
m.bitLength = uint16(buf[0])<<8 | uint16(buf[1])
m.bytes = make([]byte, (int(m.bitLength)+7)/8)
nn, err := io.ReadFull(r, m.bytes)
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
// remove leading zero bytes from malformed GnuPG encoded MPIs:
// https://bugs.gnupg.org/gnupg/issue1853
// for _, b := range m.bytes {
// if b != 0 {
// break
// }
// m.bytes = m.bytes[1:]
// m.bitLength -= 8
// }
return int64(n) + int64(nn), err
}
// SetBig initializes m with the bits from n.
func (m *MPI) SetBig(n *big.Int) *MPI {
m.bytes = n.Bytes()
m.bitLength = uint16(n.BitLen())
return m
}

88
vendor/github.com/ProtonMail/go-crypto/openpgp/internal/encoding/oid.go generated vendored Normal file
View file

@ -0,0 +1,88 @@
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package encoding
import (
"io"
"github.com/ProtonMail/go-crypto/openpgp/errors"
)
// OID is used to store a variable-length field with a one-octet size
// prefix. See https://tools.ietf.org/html/rfc6637#section-9.
type OID struct {
bytes []byte
}
const (
// maxOID is the maximum number of bytes in a OID.
maxOID = 254
// reservedOIDLength1 and reservedOIDLength2 are OID lengths that the RFC
// specifies are reserved.
reservedOIDLength1 = 0
reservedOIDLength2 = 0xff
)
// NewOID returns a OID initialized with bytes.
func NewOID(bytes []byte) *OID {
switch len(bytes) {
case reservedOIDLength1, reservedOIDLength2:
panic("encoding: NewOID argument length is reserved")
default:
if len(bytes) > maxOID {
panic("encoding: NewOID argment too large")
}
}
return &OID{
bytes: bytes,
}
}
// Bytes returns the decoded data.
func (o *OID) Bytes() []byte {
return o.bytes
}
// BitLength is the size in bits of the decoded data.
func (o *OID) BitLength() uint16 {
return uint16(len(o.bytes) * 8)
}
// EncodedBytes returns the encoded data.
func (o *OID) EncodedBytes() []byte {
return append([]byte{byte(len(o.bytes))}, o.bytes...)
}
// EncodedLength is the size in bytes of the encoded data.
func (o *OID) EncodedLength() uint16 {
return uint16(1 + len(o.bytes))
}
// ReadFrom reads into b the next OID from r.
func (o *OID) ReadFrom(r io.Reader) (int64, error) {
var buf [1]byte
n, err := io.ReadFull(r, buf[:])
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return int64(n), err
}
switch buf[0] {
case reservedOIDLength1, reservedOIDLength2:
return int64(n), errors.UnsupportedError("reserved for future extensions")
}
o.bytes = make([]byte, buf[0])
nn, err := io.ReadFull(r, o.bytes)
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return int64(n) + int64(nn), err
}

375
vendor/github.com/ProtonMail/go-crypto/openpgp/key_generation.go generated vendored Normal file
View file

@ -0,0 +1,375 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
"crypto"
"crypto/rand"
"crypto/rsa"
goerrors "errors"
"io"
"math/big"
"github.com/ProtonMail/go-crypto/openpgp/ecdh"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
"github.com/ProtonMail/go-crypto/openpgp/packet"
"golang.org/x/crypto/ed25519"
)
// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
// single identity composed of the given full name, comment and email, any of
// which may be empty but must not contain any of "()<>\x00".
// If config is nil, sensible defaults will be used.
func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
creationTime := config.Now()
keyLifetimeSecs := config.KeyLifetime()
uid := packet.NewUserId(name, comment, email)
if uid == nil {
return nil, errors.InvalidArgumentError("user id field contained invalid characters")
}
// Generate a primary signing key
primaryPrivRaw, err := newSigner(config)
if err != nil {
return nil, err
}
primary := packet.NewSignerPrivateKey(creationTime, primaryPrivRaw)
if config != nil && config.V5Keys {
primary.UpgradeToV5()
}
isPrimaryId := true
selfSignature := &packet.Signature{
Version: primary.PublicKey.Version,
SigType: packet.SigTypePositiveCert,
PubKeyAlgo: primary.PublicKey.PubKeyAlgo,
Hash: config.Hash(),
CreationTime: creationTime,
KeyLifetimeSecs: &keyLifetimeSecs,
IssuerKeyId: &primary.PublicKey.KeyId,
IssuerFingerprint: primary.PublicKey.Fingerprint,
IsPrimaryId: &isPrimaryId,
FlagsValid: true,
FlagSign: true,
FlagCertify: true,
MDC: true, // true by default, see 5.8 vs. 5.14
AEAD: config.AEAD() != nil,
V5Keys: config != nil && config.V5Keys,
}
// Set the PreferredHash for the SelfSignature from the packet.Config.
// If it is not the must-implement algorithm from rfc4880bis, append that.
selfSignature.PreferredHash = []uint8{hashToHashId(config.Hash())}
if config.Hash() != crypto.SHA256 {
selfSignature.PreferredHash = append(selfSignature.PreferredHash, hashToHashId(crypto.SHA256))
}
// Likewise for DefaultCipher.
selfSignature.PreferredSymmetric = []uint8{uint8(config.Cipher())}
if config.Cipher() != packet.CipherAES128 {
selfSignature.PreferredSymmetric = append(selfSignature.PreferredSymmetric, uint8(packet.CipherAES128))
}
// And for DefaultMode.
selfSignature.PreferredAEAD = []uint8{uint8(config.AEAD().Mode())}
if config.AEAD().Mode() != packet.AEADModeEAX {
selfSignature.PreferredAEAD = append(selfSignature.PreferredAEAD, uint8(packet.AEADModeEAX))
}
// User ID binding signature
err = selfSignature.SignUserId(uid.Id, &primary.PublicKey, primary, config)
if err != nil {
return nil, err
}
// Generate an encryption subkey
subPrivRaw, err := newDecrypter(config)
if err != nil {
return nil, err
}
sub := packet.NewDecrypterPrivateKey(creationTime, subPrivRaw)
sub.IsSubkey = true
sub.PublicKey.IsSubkey = true
if config != nil && config.V5Keys {
sub.UpgradeToV5()
}
// NOTE: No KeyLifetimeSecs here, but we will not return this subkey in EncryptionKey()
// if the primary/master key has expired.
subKey := Subkey{
PublicKey: &sub.PublicKey,
PrivateKey: sub,
Sig: &packet.Signature{
Version: primary.PublicKey.Version,
CreationTime: creationTime,
SigType: packet.SigTypeSubkeyBinding,
PubKeyAlgo: primary.PublicKey.PubKeyAlgo,
Hash: config.Hash(),
FlagsValid: true,
FlagEncryptStorage: true,
FlagEncryptCommunications: true,
IssuerKeyId: &primary.PublicKey.KeyId,
},
}
// Subkey binding signature
err = subKey.Sig.SignKey(subKey.PublicKey, primary, config)
if err != nil {
return nil, err
}
return &Entity{
PrimaryKey: &primary.PublicKey,
PrivateKey: primary,
Identities: map[string]*Identity{
uid.Id: &Identity{
Name: uid.Id,
UserId: uid,
SelfSignature: selfSignature,
Signatures: []*packet.Signature{selfSignature},
},
},
Subkeys: []Subkey{subKey},
}, nil
}
// AddSigningSubkey adds a signing keypair as a subkey to the Entity.
// If config is nil, sensible defaults will be used.
func (e *Entity) AddSigningSubkey(config *packet.Config) error {
creationTime := config.Now()
keyLifetimeSecs := config.KeyLifetime()
subPrivRaw, err := newSigner(config)
if err != nil {
return err
}
sub := packet.NewSignerPrivateKey(creationTime, subPrivRaw)
subkey := Subkey{
PublicKey: &sub.PublicKey,
PrivateKey: sub,
Sig: &packet.Signature{
Version: e.PrimaryKey.Version,
CreationTime: creationTime,
KeyLifetimeSecs: &keyLifetimeSecs,
SigType: packet.SigTypeSubkeyBinding,
PubKeyAlgo: e.PrimaryKey.PubKeyAlgo,
Hash: config.Hash(),
FlagsValid: true,
FlagSign: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
EmbeddedSignature: &packet.Signature{
Version: e.PrimaryKey.Version,
CreationTime: creationTime,
SigType: packet.SigTypePrimaryKeyBinding,
PubKeyAlgo: sub.PublicKey.PubKeyAlgo,
Hash: config.Hash(),
IssuerKeyId: &e.PrimaryKey.KeyId,
},
},
}
if config != nil && config.V5Keys {
subkey.PublicKey.UpgradeToV5()
}
err = subkey.Sig.EmbeddedSignature.CrossSignKey(subkey.PublicKey, e.PrimaryKey, subkey.PrivateKey, config)
if err != nil {
return err
}
subkey.PublicKey.IsSubkey = true
subkey.PrivateKey.IsSubkey = true
if err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config); err != nil {
return err
}
e.Subkeys = append(e.Subkeys, subkey)
return nil
}
// AddEncryptionSubkey adds an encryption keypair as a subkey to the Entity.
// If config is nil, sensible defaults will be used.
func (e *Entity) AddEncryptionSubkey(config *packet.Config) error {
creationTime := config.Now()
keyLifetimeSecs := config.KeyLifetime()
subPrivRaw, err := newDecrypter(config)
if err != nil {
return err
}
sub := packet.NewDecrypterPrivateKey(creationTime, subPrivRaw)
subkey := Subkey{
PublicKey: &sub.PublicKey,
PrivateKey: sub,
Sig: &packet.Signature{
Version: e.PrimaryKey.Version,
CreationTime: creationTime,
KeyLifetimeSecs: &keyLifetimeSecs,
SigType: packet.SigTypeSubkeyBinding,
PubKeyAlgo: e.PrimaryKey.PubKeyAlgo,
Hash: config.Hash(),
FlagsValid: true,
FlagEncryptStorage: true,
FlagEncryptCommunications: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
},
}
if config != nil && config.V5Keys {
subkey.PublicKey.UpgradeToV5()
}
subkey.PublicKey.IsSubkey = true
subkey.PrivateKey.IsSubkey = true
if err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config); err != nil {
return err
}
e.Subkeys = append(e.Subkeys, subkey)
return nil
}
// Generates a signing key
func newSigner(config *packet.Config) (signer crypto.Signer, err error) {
switch config.PublicKeyAlgorithm() {
case packet.PubKeyAlgoRSA:
bits := config.RSAModulusBits()
if bits < 1024 {
return nil, errors.InvalidArgumentError("bits must be >= 1024")
}
if config != nil && len(config.RSAPrimes) >= 2 {
primes := config.RSAPrimes[0:2]
config.RSAPrimes = config.RSAPrimes[2:]
return generateRSAKeyWithPrimes(config.Random(), 2, bits, primes)
}
return rsa.GenerateKey(config.Random(), bits)
case packet.PubKeyAlgoEdDSA:
_, priv, err := ed25519.GenerateKey(config.Random())
if err != nil {
return nil, err
}
return &priv, nil
default:
return nil, errors.InvalidArgumentError("unsupported public key algorithm")
}
}
// Generates an encryption/decryption key
func newDecrypter(config *packet.Config) (decrypter interface{}, err error) {
switch config.PublicKeyAlgorithm() {
case packet.PubKeyAlgoRSA:
bits := config.RSAModulusBits()
if bits < 1024 {
return nil, errors.InvalidArgumentError("bits must be >= 1024")
}
if config != nil && len(config.RSAPrimes) >= 2 {
primes := config.RSAPrimes[0:2]
config.RSAPrimes = config.RSAPrimes[2:]
return generateRSAKeyWithPrimes(config.Random(), 2, bits, primes)
}
return rsa.GenerateKey(config.Random(), bits)
case packet.PubKeyAlgoEdDSA:
fallthrough // When passing EdDSA, we generate an ECDH subkey
case packet.PubKeyAlgoECDH:
var kdf = ecdh.KDF{
Hash: algorithm.SHA512,
Cipher: algorithm.AES256,
}
return ecdh.X25519GenerateKey(config.Random(), kdf)
default:
return nil, errors.InvalidArgumentError("unsupported public key algorithm")
}
}
var bigOne = big.NewInt(1)
// generateRSAKeyWithPrimes generates a multi-prime RSA keypair of the
// given bit size, using the given random source and prepopulated primes.
func generateRSAKeyWithPrimes(random io.Reader, nprimes int, bits int, prepopulatedPrimes []*big.Int) (*rsa.PrivateKey, error) {
priv := new(rsa.PrivateKey)
priv.E = 65537
if nprimes < 2 {
return nil, goerrors.New("generateRSAKeyWithPrimes: nprimes must be >= 2")
}
if bits < 1024 {
return nil, goerrors.New("generateRSAKeyWithPrimes: bits must be >= 1024")
}
primes := make([]*big.Int, nprimes)
NextSetOfPrimes:
for {
todo := bits
// crypto/rand should set the top two bits in each prime.
// Thus each prime has the form
// p_i = 2^bitlen(p_i) × 0.11... (in base 2).
// And the product is:
// P = 2^todo × α
// where α is the product of nprimes numbers of the form 0.11...
//
// If α < 1/2 (which can happen for nprimes > 2), we need to
// shift todo to compensate for lost bits: the mean value of 0.11...
// is 7/8, so todo + shift - nprimes * log2(7/8) ~= bits - 1/2
// will give good results.
if nprimes >= 7 {
todo += (nprimes - 2) / 5
}
for i := 0; i < nprimes; i++ {
var err error
if len(prepopulatedPrimes) == 0 {
primes[i], err = rand.Prime(random, todo/(nprimes-i))
if err != nil {
return nil, err
}
} else {
primes[i] = prepopulatedPrimes[0]
prepopulatedPrimes = prepopulatedPrimes[1:]
}
todo -= primes[i].BitLen()
}
// Make sure that primes is pairwise unequal.
for i, prime := range primes {
for j := 0; j < i; j++ {
if prime.Cmp(primes[j]) == 0 {
continue NextSetOfPrimes
}
}
}
n := new(big.Int).Set(bigOne)
totient := new(big.Int).Set(bigOne)
pminus1 := new(big.Int)
for _, prime := range primes {
n.Mul(n, prime)
pminus1.Sub(prime, bigOne)
totient.Mul(totient, pminus1)
}
if n.BitLen() != bits {
// This should never happen for nprimes == 2 because
// crypto/rand should set the top two bits in each prime.
// For nprimes > 2 we hope it does not happen often.
continue NextSetOfPrimes
}
priv.D = new(big.Int)
e := big.NewInt(int64(priv.E))
ok := priv.D.ModInverse(e, totient)
if ok != nil {
priv.Primes = primes
priv.N = n
break
}
}
priv.Precompute()
return priv, nil
}

707
vendor/github.com/ProtonMail/go-crypto/openpgp/keys.go generated vendored Normal file
View file

@ -0,0 +1,707 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
goerrors "errors"
"io"
"time"
"github.com/ProtonMail/go-crypto/openpgp/armor"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/packet"
)
// PublicKeyType is the armor type for a PGP public key.
var PublicKeyType = "PGP PUBLIC KEY BLOCK"
// PrivateKeyType is the armor type for a PGP private key.
var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
// An Entity represents the components of an OpenPGP key: a primary public key
// (which must be a signing key), one or more identities claimed by that key,
// and zero or more subkeys, which may be encryption keys.
type Entity struct {
PrimaryKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Identities map[string]*Identity // indexed by Identity.Name
Revocations []*packet.Signature
Subkeys []Subkey
}
// An Identity represents an identity claimed by an Entity and zero or more
// assertions by other entities about that claim.
type Identity struct {
Name string // by convention, has the form "Full Name (comment) <email@example.com>"
UserId *packet.UserId
SelfSignature *packet.Signature
Signatures []*packet.Signature
}
// A Subkey is an additional public key in an Entity. Subkeys can be used for
// encryption.
type Subkey struct {
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Sig *packet.Signature
}
// A Key identifies a specific public key in an Entity. This is either the
// Entity's primary key or a subkey.
type Key struct {
Entity *Entity
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
SelfSignature *packet.Signature
}
// A KeyRing provides access to public and private keys.
type KeyRing interface {
// KeysById returns the set of keys that have the given key id.
KeysById(id uint64) []Key
// KeysByIdAndUsage returns the set of keys with the given id
// that also meet the key usage given by requiredUsage.
// The requiredUsage is expressed as the bitwise-OR of
// packet.KeyFlag* values.
KeysByIdUsage(id uint64, requiredUsage byte) []Key
// DecryptionKeys returns all private keys that are valid for
// decryption.
DecryptionKeys() []Key
}
// PrimaryIdentity returns the Identity marked as primary or the first identity
// if none are so marked.
func (e *Entity) PrimaryIdentity() *Identity {
var firstIdentity *Identity
for _, ident := range e.Identities {
if firstIdentity == nil {
firstIdentity = ident
}
if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
return ident
}
}
return firstIdentity
}
// EncryptionKey returns the best candidate Key for encrypting a message to the
// given Entity.
func (e *Entity) EncryptionKey(now time.Time) (Key, bool) {
// Fail to find any encryption key if the primary key has expired.
i := e.PrimaryIdentity()
primaryKeyExpired := e.PrimaryKey.KeyExpired(i.SelfSignature, now)
if primaryKeyExpired {
return Key{}, false
}
// Iterate the keys to find the newest, unexpired one
candidateSubkey := -1
var maxTime time.Time
for i, subkey := range e.Subkeys {
if subkey.Sig.FlagsValid &&
subkey.Sig.FlagEncryptCommunications &&
subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
!subkey.PublicKey.KeyExpired(subkey.Sig, now) &&
(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
candidateSubkey = i
maxTime = subkey.Sig.CreationTime
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
}
// If we don't have any candidate subkeys for encryption and
// the primary key doesn't have any usage metadata then we
// assume that the primary key is ok. Or, if the primary key is
// marked as ok to encrypt with, then we can obviously use it.
// Also, check expiry again just to be safe.
if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications &&
e.PrimaryKey.PubKeyAlgo.CanEncrypt() && !primaryKeyExpired {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
}
return Key{}, false
}
// SigningKey return the best candidate Key for signing a message with this
// Entity.
func (e *Entity) SigningKey(now time.Time) (Key, bool) {
return e.SigningKeyById(now, 0)
}
// SigningKeyById return the Key for signing a message with this
// Entity and keyID.
func (e *Entity) SigningKeyById(now time.Time, id uint64) (Key, bool) {
// Fail to find any signing key if the primary key has expired.
i := e.PrimaryIdentity()
primaryKeyExpired := e.PrimaryKey.KeyExpired(i.SelfSignature, now)
if primaryKeyExpired {
return Key{}, false
}
// Iterate the keys to find the newest, unexpired one
candidateSubkey := -1
var maxTime time.Time
for idx, subkey := range e.Subkeys {
if subkey.Sig.FlagsValid &&
subkey.Sig.FlagSign &&
subkey.PublicKey.PubKeyAlgo.CanSign() &&
!subkey.PublicKey.KeyExpired(subkey.Sig, now) &&
(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) &&
(id == 0 || subkey.PrivateKey.KeyId == id) {
candidateSubkey = idx
maxTime = subkey.Sig.CreationTime
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
}
// If we have no candidate subkey then we assume that it's ok to sign
// with the primary key. Or, if the primary key is marked as ok to
// sign with, then we can use it. Also, check expiry again just to be safe.
if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign &&
e.PrimaryKey.PubKeyAlgo.CanSign() && !primaryKeyExpired &&
(id == 0 || e.PrivateKey.KeyId == id) {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
}
// No keys with a valid Signing Flag or no keys matched the id passed in
return Key{}, false
}
// An EntityList contains one or more Entities.
type EntityList []*Entity
// KeysById returns the set of keys that have the given key id.
func (el EntityList) KeysById(id uint64) (keys []Key) {
for _, e := range el {
if e.PrimaryKey.KeyId == id {
var selfSig *packet.Signature
for _, ident := range e.Identities {
if selfSig == nil {
selfSig = ident.SelfSignature
} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
selfSig = ident.SelfSignature
break
}
}
keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig})
}
for _, subKey := range e.Subkeys {
if subKey.PublicKey.KeyId == id {
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
}
}
}
return
}
// KeysByIdAndUsage returns the set of keys with the given id that also meet
// the key usage given by requiredUsage. The requiredUsage is expressed as
// the bitwise-OR of packet.KeyFlag* values.
func (el EntityList) KeysByIdUsage(id uint64, requiredUsage byte) (keys []Key) {
for _, key := range el.KeysById(id) {
if len(key.Entity.Revocations) > 0 {
continue
}
if key.SelfSignature.RevocationReason != nil {
continue
}
if key.SelfSignature.FlagsValid && requiredUsage != 0 {
var usage byte
if key.SelfSignature.FlagCertify {
usage |= packet.KeyFlagCertify
}
if key.SelfSignature.FlagSign {
usage |= packet.KeyFlagSign
}
if key.SelfSignature.FlagEncryptCommunications {
usage |= packet.KeyFlagEncryptCommunications
}
if key.SelfSignature.FlagEncryptStorage {
usage |= packet.KeyFlagEncryptStorage
}
if usage&requiredUsage != requiredUsage {
continue
}
}
keys = append(keys, key)
}
return
}
// DecryptionKeys returns all private keys that are valid for decryption.
func (el EntityList) DecryptionKeys() (keys []Key) {
for _, e := range el {
for _, subKey := range e.Subkeys {
if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
}
}
}
return
}
// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
block, err := armor.Decode(r)
if err == io.EOF {
return nil, errors.InvalidArgumentError("no armored data found")
}
if err != nil {
return nil, err
}
if block.Type != PublicKeyType && block.Type != PrivateKeyType {
return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
}
return ReadKeyRing(block.Body)
}
// ReadKeyRing reads one or more public/private keys. Unsupported keys are
// ignored as long as at least a single valid key is found.
func ReadKeyRing(r io.Reader) (el EntityList, err error) {
packets := packet.NewReader(r)
var lastUnsupportedError error
for {
var e *Entity
e, err = ReadEntity(packets)
if err != nil {
// TODO: warn about skipped unsupported/unreadable keys
if _, ok := err.(errors.UnsupportedError); ok {
lastUnsupportedError = err
err = readToNextPublicKey(packets)
} else if _, ok := err.(errors.StructuralError); ok {
// Skip unreadable, badly-formatted keys
lastUnsupportedError = err
err = readToNextPublicKey(packets)
}
if err == io.EOF {
err = nil
break
}
if err != nil {
el = nil
break
}
} else {
el = append(el, e)
}
}
if len(el) == 0 && err == nil {
err = lastUnsupportedError
}
return
}
// readToNextPublicKey reads packets until the start of the entity and leaves
// the first packet of the new entity in the Reader.
func readToNextPublicKey(packets *packet.Reader) (err error) {
var p packet.Packet
for {
p, err = packets.Next()
if err == io.EOF {
return
} else if err != nil {
if _, ok := err.(errors.UnsupportedError); ok {
err = nil
continue
}
return
}
if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
packets.Unread(p)
return
}
}
}
// ReadEntity reads an entity (public key, identities, subkeys etc) from the
// given Reader.
func ReadEntity(packets *packet.Reader) (*Entity, error) {
e := new(Entity)
e.Identities = make(map[string]*Identity)
p, err := packets.Next()
if err != nil {
return nil, err
}
var ok bool
if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
packets.Unread(p)
return nil, errors.StructuralError("first packet was not a public/private key")
}
e.PrimaryKey = &e.PrivateKey.PublicKey
}
if !e.PrimaryKey.PubKeyAlgo.CanSign() {
return nil, errors.StructuralError("primary key cannot be used for signatures")
}
var revocations []*packet.Signature
EachPacket:
for {
p, err := packets.Next()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
switch pkt := p.(type) {
case *packet.UserId:
if err := addUserID(e, packets, pkt); err != nil {
return nil, err
}
case *packet.Signature:
if pkt.SigType == packet.SigTypeKeyRevocation {
revocations = append(revocations, pkt)
} else if pkt.SigType == packet.SigTypeDirectSignature {
// TODO: RFC4880 5.2.1 permits signatures
// directly on keys (eg. to bind additional
// revocation keys).
}
// Else, ignoring the signature as it does not follow anything
// we would know to attach it to.
case *packet.PrivateKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, &pkt.PublicKey, pkt)
if err != nil {
return nil, err
}
case *packet.PublicKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, pkt, nil)
if err != nil {
return nil, err
}
default:
// we ignore unknown packets
}
}
if len(e.Identities) == 0 {
return nil, errors.StructuralError("entity without any identities")
}
for _, revocation := range revocations {
err = e.PrimaryKey.VerifyRevocationSignature(revocation)
if err == nil {
e.Revocations = append(e.Revocations, revocation)
} else {
// TODO: RFC 4880 5.2.3.15 defines revocation keys.
return nil, errors.StructuralError("revocation signature signed by alternate key")
}
}
return e, nil
}
func addUserID(e *Entity, packets *packet.Reader, pkt *packet.UserId) error {
// Make a new Identity object, that we might wind up throwing away.
// We'll only add it if we get a valid self-signature over this
// userID.
identity := new(Identity)
identity.Name = pkt.Id
identity.UserId = pkt
for {
p, err := packets.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
sig, ok := p.(*packet.Signature)
if !ok {
packets.Unread(p)
break
}
if (sig.SigType == packet.SigTypePositiveCert || sig.SigType == packet.SigTypeGenericCert) && sig.CheckKeyIdOrFingerprint(e.PrimaryKey) {
if err = e.PrimaryKey.VerifyUserIdSignature(pkt.Id, e.PrimaryKey, sig); err != nil {
return errors.StructuralError("user ID self-signature invalid: " + err.Error())
}
if identity.SelfSignature == nil || sig.CreationTime.After(identity.SelfSignature.CreationTime) {
identity.SelfSignature = sig
}
identity.Signatures = append(identity.Signatures, sig)
e.Identities[pkt.Id] = identity
} else {
identity.Signatures = append(identity.Signatures, sig)
}
}
return nil
}
func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
var subKey Subkey
subKey.PublicKey = pub
subKey.PrivateKey = priv
for {
p, err := packets.Next()
if err == io.EOF {
break
} else if err != nil {
return errors.StructuralError("subkey signature invalid: " + err.Error())
}
sig, ok := p.(*packet.Signature)
if !ok {
packets.Unread(p)
break
}
if sig.SigType != packet.SigTypeSubkeyBinding && sig.SigType != packet.SigTypeSubkeyRevocation {
return errors.StructuralError("subkey signature with wrong type")
}
if err := e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, sig); err != nil {
return errors.StructuralError("subkey signature invalid: " + err.Error())
}
switch sig.SigType {
case packet.SigTypeSubkeyRevocation:
subKey.Sig = sig
case packet.SigTypeSubkeyBinding:
if shouldReplaceSubkeySig(subKey.Sig, sig) {
subKey.Sig = sig
}
}
}
if subKey.Sig == nil {
return errors.StructuralError("subkey packet not followed by signature")
}
e.Subkeys = append(e.Subkeys, subKey)
return nil
}
func shouldReplaceSubkeySig(existingSig, potentialNewSig *packet.Signature) bool {
if potentialNewSig == nil {
return false
}
if existingSig == nil {
return true
}
if existingSig.SigType == packet.SigTypeSubkeyRevocation {
return false // never override a revocation signature
}
return potentialNewSig.CreationTime.After(existingSig.CreationTime)
}
// SerializePrivate serializes an Entity, including private key material, but
// excluding signatures from other entities, to the given Writer.
// Identities and subkeys are re-signed in case they changed since NewEntry.
// If config is nil, sensible defaults will be used.
func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
if e.PrivateKey.Dummy() {
return errors.ErrDummyPrivateKey("dummy private key cannot re-sign identities")
}
return e.serializePrivate(w, config, true)
}
// SerializePrivateWithoutSigning serializes an Entity, including private key
// material, but excluding signatures from other entities, to the given Writer.
// Self-signatures of identities and subkeys are not re-signed. This is useful
// when serializing GNU dummy keys, among other things.
// If config is nil, sensible defaults will be used.
func (e *Entity) SerializePrivateWithoutSigning(w io.Writer, config *packet.Config) (err error) {
return e.serializePrivate(w, config, false)
}
func (e *Entity) serializePrivate(w io.Writer, config *packet.Config, reSign bool) (err error) {
if e.PrivateKey == nil {
return goerrors.New("openpgp: private key is missing")
}
err = e.PrivateKey.Serialize(w)
if err != nil {
return
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return
}
if reSign {
err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
if err != nil {
return
}
}
err = ident.SelfSignature.Serialize(w)
if err != nil {
return
}
}
for _, subkey := range e.Subkeys {
err = subkey.PrivateKey.Serialize(w)
if err != nil {
return
}
if reSign {
err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
if err != nil {
return
}
if subkey.Sig.EmbeddedSignature != nil {
err = subkey.Sig.EmbeddedSignature.CrossSignKey(subkey.PublicKey, e.PrimaryKey,
subkey.PrivateKey, config)
if err != nil {
return
}
}
}
err = subkey.Sig.Serialize(w)
if err != nil {
return
}
}
return nil
}
// Serialize writes the public part of the given Entity to w, including
// signatures from other entities. No private key material will be output.
func (e *Entity) Serialize(w io.Writer) error {
err := e.PrimaryKey.Serialize(w)
if err != nil {
return err
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return err
}
for _, sig := range ident.Signatures {
err = sig.Serialize(w)
if err != nil {
return err
}
}
}
for _, subkey := range e.Subkeys {
err = subkey.PublicKey.Serialize(w)
if err != nil {
return err
}
err = subkey.Sig.Serialize(w)
if err != nil {
return err
}
}
return nil
}
// SignIdentity adds a signature to e, from signer, attesting that identity is
// associated with e. The provided identity must already be an element of
// e.Identities and the private key of signer must have been decrypted if
// necessary.
// If config is nil, sensible defaults will be used.
func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
if signer.PrivateKey == nil {
return errors.InvalidArgumentError("signing Entity must have a private key")
}
if signer.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
}
ident, ok := e.Identities[identity]
if !ok {
return errors.InvalidArgumentError("given identity string not found in Entity")
}
sig := &packet.Signature{
Version: signer.PrivateKey.Version,
SigType: packet.SigTypeGenericCert,
PubKeyAlgo: signer.PrivateKey.PubKeyAlgo,
Hash: config.Hash(),
CreationTime: config.Now(),
IssuerKeyId: &signer.PrivateKey.KeyId,
}
if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
return err
}
ident.Signatures = append(ident.Signatures, sig)
return nil
}
// RevokeKey generates a key revocation signature (packet.SigTypeKeyRevocation) with the
// specified reason code and text (RFC4880 section-5.2.3.23).
// If config is nil, sensible defaults will be used.
func (e *Entity) RevokeKey(reason packet.ReasonForRevocation, reasonText string, config *packet.Config) error {
reasonCode := uint8(reason)
revSig := &packet.Signature{
Version: e.PrimaryKey.Version,
CreationTime: config.Now(),
SigType: packet.SigTypeKeyRevocation,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
RevocationReason: &reasonCode,
RevocationReasonText: reasonText,
IssuerKeyId: &e.PrimaryKey.KeyId,
}
if err := revSig.RevokeKey(e.PrimaryKey, e.PrivateKey, config); err != nil {
return err
}
e.Revocations = append(e.Revocations, revSig)
return nil
}
// RevokeSubkey generates a subkey revocation signature (packet.SigTypeSubkeyRevocation) for
// a subkey with the specified reason code and text (RFC4880 section-5.2.3.23).
// If config is nil, sensible defaults will be used.
func (e *Entity) RevokeSubkey(sk *Subkey, reason packet.ReasonForRevocation, reasonText string, config *packet.Config) error {
if err := e.PrimaryKey.VerifyKeySignature(sk.PublicKey, sk.Sig); err != nil {
return errors.InvalidArgumentError("given subkey is not associated with this key")
}
reasonCode := uint8(reason)
revSig := &packet.Signature{
Version: e.PrimaryKey.Version,
CreationTime: config.Now(),
SigType: packet.SigTypeSubkeyRevocation,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
RevocationReason: &reasonCode,
RevocationReasonText: reasonText,
IssuerKeyId: &e.PrimaryKey.KeyId,
}
if err := revSig.RevokeKey(sk.PublicKey, e.PrivateKey, config); err != nil {
return err
}
sk.Sig = revSig
return nil
}

336
vendor/github.com/ProtonMail/go-crypto/openpgp/keys_test_data.go generated vendored Normal file
View file

File diff suppressed because one or more lines are too long

56
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/aead_config.go generated vendored Normal file
View file

@ -0,0 +1,56 @@
// Copyright (C) 2019 ProtonTech AG
package packet
import "math/bits"
// AEADConfig collects a number of AEAD parameters along with sensible defaults.
// A nil AEADConfig is valid and results in all default values.
type AEADConfig struct {
// The AEAD mode of operation.
DefaultMode AEADMode
// Amount of octets in each chunk of data
ChunkSize uint64
}
// Mode returns the AEAD mode of operation.
func (conf *AEADConfig) Mode() AEADMode {
if conf == nil || conf.DefaultMode == 0 {
return AEADModeEAX
}
mode := conf.DefaultMode
if mode != AEADModeEAX && mode != AEADModeOCB &&
mode != AEADModeExperimentalGCM {
panic("AEAD mode unsupported")
}
return mode
}
// ChunkSizeByte returns the byte indicating the chunk size. The effective
// chunk size is computed with the formula uint64(1) << (chunkSizeByte + 6)
func (conf *AEADConfig) ChunkSizeByte() byte {
if conf == nil || conf.ChunkSize == 0 {
return 12 // 1 << (12 + 6) == 262144 bytes
}
chunkSize := conf.ChunkSize
exponent := bits.Len64(chunkSize) - 1
switch {
case exponent < 6:
exponent = 6
case exponent > 27:
exponent = 27
}
return byte(exponent - 6)
}
// decodeAEADChunkSize returns the effective chunk size. In 32-bit systems, the
// maximum returned value is 1 << 30.
func decodeAEADChunkSize(c byte) int {
size := uint64(1 << (c + 6))
if size != uint64(int(size)) {
return 1 << 30
}
return int(size)
}

364
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/aead_encrypted.go generated vendored Normal file
View file

@ -0,0 +1,364 @@
// Copyright (C) 2019 ProtonTech AG
package packet
import (
"bytes"
"crypto/cipher"
"crypto/rand"
"encoding/binary"
"io"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
)
// AEADEncrypted represents an AEAD Encrypted Packet (tag 20, RFC4880bis-5.16).
type AEADEncrypted struct {
cipher CipherFunction
mode AEADMode
chunkSizeByte byte
Contents io.Reader // Encrypted chunks and tags
initialNonce []byte // Referred to as IV in RFC4880-bis
}
// Only currently defined version
const aeadEncryptedVersion = 1
// An AEAD opener/sealer, its configuration, and data for en/decryption.
type aeadCrypter struct {
aead cipher.AEAD
chunkSize int
initialNonce []byte
associatedData []byte // Chunk-independent associated data
chunkIndex []byte // Chunk counter
bytesProcessed int // Amount of plaintext bytes encrypted/decrypted
buffer bytes.Buffer // Buffered bytes accross chunks
}
// aeadEncrypter encrypts and writes bytes. It encrypts when necessary according
// to the AEAD block size, and buffers the extra encrypted bytes for next write.
type aeadEncrypter struct {
aeadCrypter // Embedded plaintext sealer
writer io.WriteCloser // 'writer' is a partialLengthWriter
}
// aeadDecrypter reads and decrypts bytes. It buffers extra decrypted bytes when
// necessary, similar to aeadEncrypter.
type aeadDecrypter struct {
aeadCrypter // Embedded ciphertext opener
reader io.Reader // 'reader' is a partialLengthReader
peekedBytes []byte // Used to detect last chunk
eof bool
}
func (ae *AEADEncrypted) parse(buf io.Reader) error {
headerData := make([]byte, 4)
if n, err := io.ReadFull(buf, headerData); n < 4 {
return errors.AEADError("could not read aead header:" + err.Error())
}
// Read initial nonce
mode := AEADMode(headerData[2])
nonceLen := mode.NonceLength()
if nonceLen == 0 {
return errors.AEADError("unknown mode")
}
initialNonce := make([]byte, nonceLen)
if n, err := io.ReadFull(buf, initialNonce); n < nonceLen {
return errors.AEADError("could not read aead nonce:" + err.Error())
}
ae.Contents = buf
ae.initialNonce = initialNonce
c := headerData[1]
if _, ok := algorithm.CipherById[c]; !ok {
return errors.UnsupportedError("unknown cipher: " + string(c))
}
ae.cipher = CipherFunction(c)
ae.mode = mode
ae.chunkSizeByte = byte(headerData[3])
return nil
}
// Decrypt returns a io.ReadCloser from which decrypted bytes can be read, or
// an error.
func (ae *AEADEncrypted) Decrypt(ciph CipherFunction, key []byte) (io.ReadCloser, error) {
return ae.decrypt(key)
}
// decrypt prepares an aeadCrypter and returns a ReadCloser from which
// decrypted bytes can be read (see aeadDecrypter.Read()).
func (ae *AEADEncrypted) decrypt(key []byte) (io.ReadCloser, error) {
blockCipher := ae.cipher.new(key)
aead := ae.mode.new(blockCipher)
// Carry the first tagLen bytes
tagLen := ae.mode.TagLength()
peekedBytes := make([]byte, tagLen)
n, err := io.ReadFull(ae.Contents, peekedBytes)
if n < tagLen || (err != nil && err != io.EOF) {
return nil, errors.AEADError("Not enough data to decrypt:" + err.Error())
}
chunkSize := decodeAEADChunkSize(ae.chunkSizeByte)
return &aeadDecrypter{
aeadCrypter: aeadCrypter{
aead: aead,
chunkSize: chunkSize,
initialNonce: ae.initialNonce,
associatedData: ae.associatedData(),
chunkIndex: make([]byte, 8),
},
reader: ae.Contents,
peekedBytes: peekedBytes}, nil
}
// Read decrypts bytes and reads them into dst. It decrypts when necessary and
// buffers extra decrypted bytes. It returns the number of bytes copied into dst
// and an error.
func (ar *aeadDecrypter) Read(dst []byte) (n int, err error) {
// Return buffered plaintext bytes from previous calls
if ar.buffer.Len() > 0 {
return ar.buffer.Read(dst)
}
// Return EOF if we've previously validated the final tag
if ar.eof {
return 0, io.EOF
}
// Read a chunk
tagLen := ar.aead.Overhead()
cipherChunkBuf := new(bytes.Buffer)
_, errRead := io.CopyN(cipherChunkBuf, ar.reader, int64(ar.chunkSize + tagLen))
cipherChunk := cipherChunkBuf.Bytes()
if errRead != nil && errRead != io.EOF {
return 0, errRead
}
decrypted, errChunk := ar.openChunk(cipherChunk)
if errChunk != nil {
return 0, errChunk
}
// Return decrypted bytes, buffering if necessary
if len(dst) < len(decrypted) {
n = copy(dst, decrypted[:len(dst)])
ar.buffer.Write(decrypted[len(dst):])
} else {
n = copy(dst, decrypted)
}
// Check final authentication tag
if errRead == io.EOF {
errChunk := ar.validateFinalTag(ar.peekedBytes)
if errChunk != nil {
return n, errChunk
}
ar.eof = true // Mark EOF for when we've returned all buffered data
}
return
}
// Close is noOp. The final authentication tag of the stream was already
// checked in the last Read call. In the future, this function could be used to
// wipe the reader and peeked, decrypted bytes, if necessary.
func (ar *aeadDecrypter) Close() (err error) {
return nil
}
// SerializeAEADEncrypted initializes the aeadCrypter and returns a writer.
// This writer encrypts and writes bytes (see aeadEncrypter.Write()).
func SerializeAEADEncrypted(w io.Writer, key []byte, cipher CipherFunction, mode AEADMode, config *Config) (io.WriteCloser, error) {
writeCloser := noOpCloser{w}
writer, err := serializeStreamHeader(writeCloser, packetTypeAEADEncrypted)
if err != nil {
return nil, err
}
// Data for en/decryption: tag, version, cipher, aead mode, chunk size
aeadConf := config.AEAD()
prefix := []byte{
0xD4,
aeadEncryptedVersion,
byte(config.Cipher()),
byte(aeadConf.Mode()),
aeadConf.ChunkSizeByte(),
}
n, err := writer.Write(prefix[1:])
if err != nil || n < 4 {
return nil, errors.AEADError("could not write AEAD headers")
}
// Sample nonce
nonceLen := aeadConf.Mode().NonceLength()
nonce := make([]byte, nonceLen)
n, err = rand.Read(nonce)
if err != nil {
panic("Could not sample random nonce")
}
_, err = writer.Write(nonce)
if err != nil {
return nil, err
}
blockCipher := CipherFunction(config.Cipher()).new(key)
alg := AEADMode(aeadConf.Mode()).new(blockCipher)
chunkSize := decodeAEADChunkSize(aeadConf.ChunkSizeByte())
return &aeadEncrypter{
aeadCrypter: aeadCrypter{
aead: alg,
chunkSize: chunkSize,
associatedData: prefix,
chunkIndex: make([]byte, 8),
initialNonce: nonce,
},
writer: writer}, nil
}
// Write encrypts and writes bytes. It encrypts when necessary and buffers extra
// plaintext bytes for next call. When the stream is finished, Close() MUST be
// called to append the final tag.
func (aw *aeadEncrypter) Write(plaintextBytes []byte) (n int, err error) {
// Append plaintextBytes to existing buffered bytes
n, err = aw.buffer.Write(plaintextBytes)
if err != nil {
return n, err
}
// Encrypt and write chunks
for aw.buffer.Len() >= aw.chunkSize {
plainChunk := aw.buffer.Next(aw.chunkSize)
encryptedChunk, err := aw.sealChunk(plainChunk)
if err != nil {
return n, err
}
_, err = aw.writer.Write(encryptedChunk)
if err != nil {
return n, err
}
}
return
}
// Close encrypts and writes the remaining buffered plaintext if any, appends
// the final authentication tag, and closes the embedded writer. This function
// MUST be called at the end of a stream.
func (aw *aeadEncrypter) Close() (err error) {
// Encrypt and write a chunk if there's buffered data left, or if we haven't
// written any chunks yet.
if aw.buffer.Len() > 0 || aw.bytesProcessed == 0 {
plainChunk := aw.buffer.Bytes()
lastEncryptedChunk, err := aw.sealChunk(plainChunk)
if err != nil {
return err
}
_, err = aw.writer.Write(lastEncryptedChunk)
if err != nil {
return err
}
}
// Compute final tag (associated data: packet tag, version, cipher, aead,
// chunk size, index, total number of encrypted octets).
adata := append(aw.associatedData[:], aw.chunkIndex[:]...)
adata = append(adata, make([]byte, 8)...)
binary.BigEndian.PutUint64(adata[13:], uint64(aw.bytesProcessed))
nonce := aw.computeNextNonce()
finalTag := aw.aead.Seal(nil, nonce, nil, adata)
_, err = aw.writer.Write(finalTag)
if err != nil {
return err
}
return aw.writer.Close()
}
// sealChunk Encrypts and authenticates the given chunk.
func (aw *aeadEncrypter) sealChunk(data []byte) ([]byte, error) {
if len(data) > aw.chunkSize {
return nil, errors.AEADError("chunk exceeds maximum length")
}
if aw.associatedData == nil {
return nil, errors.AEADError("can't seal without headers")
}
adata := append(aw.associatedData, aw.chunkIndex...)
nonce := aw.computeNextNonce()
encrypted := aw.aead.Seal(nil, nonce, data, adata)
aw.bytesProcessed += len(data)
if err := aw.aeadCrypter.incrementIndex(); err != nil {
return nil, err
}
return encrypted, nil
}
// openChunk decrypts and checks integrity of an encrypted chunk, returning
// the underlying plaintext and an error. It access peeked bytes from next
// chunk, to identify the last chunk and decrypt/validate accordingly.
func (ar *aeadDecrypter) openChunk(data []byte) ([]byte, error) {
tagLen := ar.aead.Overhead()
// Restore carried bytes from last call
chunkExtra := append(ar.peekedBytes, data...)
// 'chunk' contains encrypted bytes, followed by an authentication tag.
chunk := chunkExtra[:len(chunkExtra)-tagLen]
ar.peekedBytes = chunkExtra[len(chunkExtra)-tagLen:]
adata := append(ar.associatedData, ar.chunkIndex...)
nonce := ar.computeNextNonce()
plainChunk, err := ar.aead.Open(nil, nonce, chunk, adata)
if err != nil {
return nil, err
}
ar.bytesProcessed += len(plainChunk)
if err = ar.aeadCrypter.incrementIndex(); err != nil {
return nil, err
}
return plainChunk, nil
}
// Checks the summary tag. It takes into account the total decrypted bytes into
// the associated data. It returns an error, or nil if the tag is valid.
func (ar *aeadDecrypter) validateFinalTag(tag []byte) error {
// Associated: tag, version, cipher, aead, chunk size, index, and octets
amountBytes := make([]byte, 8)
binary.BigEndian.PutUint64(amountBytes, uint64(ar.bytesProcessed))
adata := append(ar.associatedData, ar.chunkIndex...)
adata = append(adata, amountBytes...)
nonce := ar.computeNextNonce()
_, err := ar.aead.Open(nil, nonce, tag, adata)
if err != nil {
return err
}
return nil
}
// Associated data for chunks: tag, version, cipher, mode, chunk size byte
func (ae *AEADEncrypted) associatedData() []byte {
return []byte{
0xD4,
aeadEncryptedVersion,
byte(ae.cipher),
byte(ae.mode),
ae.chunkSizeByte}
}
// computeNonce takes the incremental index and computes an eXclusive OR with
// the least significant 8 bytes of the receivers' initial nonce (see sec.
// 5.16.1 and 5.16.2). It returns the resulting nonce.
func (wo *aeadCrypter) computeNextNonce() (nonce []byte) {
nonce = make([]byte, len(wo.initialNonce))
copy(nonce, wo.initialNonce)
offset := len(wo.initialNonce) - 8
for i := 0; i < 8; i++ {
nonce[i+offset] ^= wo.chunkIndex[i]
}
return
}
// incrementIndex perfoms an integer increment by 1 of the integer represented by the
// slice, modifying it accordingly.
func (wo *aeadCrypter) incrementIndex() error {
index := wo.chunkIndex
if len(index) == 0 {
return errors.AEADError("Index has length 0")
}
for i := len(index) - 1; i >= 0; i-- {
if index[i] < 255 {
index[i]++
return nil
}
index[i] = 0
}
return errors.AEADError("cannot further increment index")
}

123
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/compressed.go generated vendored Normal file
View file

@ -0,0 +1,123 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"compress/bzip2"
"compress/flate"
"compress/zlib"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"io"
"strconv"
)
// Compressed represents a compressed OpenPGP packet. The decompressed contents
// will contain more OpenPGP packets. See RFC 4880, section 5.6.
type Compressed struct {
Body io.Reader
}
const (
NoCompression = flate.NoCompression
BestSpeed = flate.BestSpeed
BestCompression = flate.BestCompression
DefaultCompression = flate.DefaultCompression
)
// CompressionConfig contains compressor configuration settings.
type CompressionConfig struct {
// Level is the compression level to use. It must be set to
// between -1 and 9, with -1 causing the compressor to use the
// default compression level, 0 causing the compressor to use
// no compression and 1 to 9 representing increasing (better,
// slower) compression levels. If Level is less than -1 or
// more then 9, a non-nil error will be returned during
// encryption. See the constants above for convenient common
// settings for Level.
Level int
}
func (c *Compressed) parse(r io.Reader) error {
var buf [1]byte
_, err := readFull(r, buf[:])
if err != nil {
return err
}
switch buf[0] {
case 1:
c.Body = flate.NewReader(r)
case 2:
c.Body, err = zlib.NewReader(r)
case 3:
c.Body = bzip2.NewReader(r)
default:
err = errors.UnsupportedError("unknown compression algorithm: " + strconv.Itoa(int(buf[0])))
}
return err
}
// compressedWriterCloser represents the serialized compression stream
// header and the compressor. Its Close() method ensures that both the
// compressor and serialized stream header are closed. Its Write()
// method writes to the compressor.
type compressedWriteCloser struct {
sh io.Closer // Stream Header
c io.WriteCloser // Compressor
}
func (cwc compressedWriteCloser) Write(p []byte) (int, error) {
return cwc.c.Write(p)
}
func (cwc compressedWriteCloser) Close() (err error) {
err = cwc.c.Close()
if err != nil {
return err
}
return cwc.sh.Close()
}
// SerializeCompressed serializes a compressed data packet to w and
// returns a WriteCloser to which the literal data packets themselves
// can be written and which MUST be closed on completion. If cc is
// nil, sensible defaults will be used to configure the compression
// algorithm.
func SerializeCompressed(w io.WriteCloser, algo CompressionAlgo, cc *CompressionConfig) (literaldata io.WriteCloser, err error) {
compressed, err := serializeStreamHeader(w, packetTypeCompressed)
if err != nil {
return
}
_, err = compressed.Write([]byte{uint8(algo)})
if err != nil {
return
}
level := DefaultCompression
if cc != nil {
level = cc.Level
}
var compressor io.WriteCloser
switch algo {
case CompressionZIP:
compressor, err = flate.NewWriter(compressed, level)
case CompressionZLIB:
compressor, err = zlib.NewWriterLevel(compressed, level)
default:
s := strconv.Itoa(int(algo))
err = errors.UnsupportedError("Unsupported compression algorithm: " + s)
}
if err != nil {
return
}
literaldata = compressedWriteCloser{compressed, compressor}
return
}

167
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/config.go generated vendored Normal file
View file

@ -0,0 +1,167 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"crypto"
"crypto/rand"
"io"
"math/big"
"time"
)
// Config collects a number of parameters along with sensible defaults.
// A nil *Config is valid and results in all default values.
type Config struct {
// Rand provides the source of entropy.
// If nil, the crypto/rand Reader is used.
Rand io.Reader
// DefaultHash is the default hash function to be used.
// If zero, SHA-256 is used.
DefaultHash crypto.Hash
// DefaultCipher is the cipher to be used.
// If zero, AES-128 is used.
DefaultCipher CipherFunction
// Time returns the current time as the number of seconds since the
// epoch. If Time is nil, time.Now is used.
Time func() time.Time
// DefaultCompressionAlgo is the compression algorithm to be
// applied to the plaintext before encryption. If zero, no
// compression is done.
DefaultCompressionAlgo CompressionAlgo
// CompressionConfig configures the compression settings.
CompressionConfig *CompressionConfig
// S2KCount is only used for symmetric encryption. It
// determines the strength of the passphrase stretching when
// the said passphrase is hashed to produce a key. S2KCount
// should be between 1024 and 65011712, inclusive. If Config
// is nil or S2KCount is 0, the value 65536 used. Not all
// values in the above range can be represented. S2KCount will
// be rounded up to the next representable value if it cannot
// be encoded exactly. When set, it is strongly encrouraged to
// use a value that is at least 65536. See RFC 4880 Section
// 3.7.1.3.
S2KCount int
// RSABits is the number of bits in new RSA keys made with NewEntity.
// If zero, then 2048 bit keys are created.
RSABits int
// The public key algorithm to use - will always create a signing primary
// key and encryption subkey.
Algorithm PublicKeyAlgorithm
// Some known primes that are optionally prepopulated by the caller
RSAPrimes []*big.Int
// AEADConfig configures the use of the new AEAD Encrypted Data Packet,
// defined in the draft of the next version of the OpenPGP specification.
// If a non-nil AEADConfig is passed, usage of this packet is enabled. By
// default, it is disabled. See the documentation of AEADConfig for more
// configuration options related to AEAD.
// **Note: using this option may break compatibility with other OpenPGP
// implementations, as well as future versions of this library.**
AEADConfig *AEADConfig
// V5Keys configures version 5 key generation. If false, this package still
// supports version 5 keys, but produces version 4 keys.
V5Keys bool
// "The validity period of the key. This is the number of seconds after
// the key creation time that the key expires. If this is not present
// or has a value of zero, the key never expires. This is found only on
// a self-signature.""
// https://tools.ietf.org/html/rfc4880#section-5.2.3.6
KeyLifetimeSecs uint32
// "The validity period of the signature. This is the number of seconds
// after the signature creation time that the signature expires. If
// this is not present or has a value of zero, it never expires."
// https://tools.ietf.org/html/rfc4880#section-5.2.3.10
SigLifetimeSecs uint32
// SigningKeyId is used to specify the signing key to use (by Key ID).
// By default, the signing key is selected automatically, preferring
// signing subkeys if available.
SigningKeyId uint64
}
func (c *Config) Random() io.Reader {
if c == nil || c.Rand == nil {
return rand.Reader
}
return c.Rand
}
func (c *Config) Hash() crypto.Hash {
if c == nil || uint(c.DefaultHash) == 0 {
return crypto.SHA256
}
return c.DefaultHash
}
func (c *Config) Cipher() CipherFunction {
if c == nil || uint8(c.DefaultCipher) == 0 {
return CipherAES128
}
return c.DefaultCipher
}
func (c *Config) Now() time.Time {
if c == nil || c.Time == nil {
return time.Now()
}
return c.Time()
}
// KeyLifetime returns the validity period of the key.
func (c *Config) KeyLifetime() uint32 {
if c == nil {
return 0
}
return c.KeyLifetimeSecs
}
// SigLifetime returns the validity period of the signature.
func (c *Config) SigLifetime() uint32 {
if c == nil {
return 0
}
return c.SigLifetimeSecs
}
func (c *Config) Compression() CompressionAlgo {
if c == nil {
return CompressionNone
}
return c.DefaultCompressionAlgo
}
func (c *Config) PasswordHashIterations() int {
if c == nil || c.S2KCount == 0 {
return 0
}
return c.S2KCount
}
func (c *Config) RSAModulusBits() int {
if c == nil || c.RSABits == 0 {
return 2048
}
return c.RSABits
}
func (c *Config) PublicKeyAlgorithm() PublicKeyAlgorithm {
if c == nil || c.Algorithm == 0 {
return PubKeyAlgoRSA
}
return c.Algorithm
}
func (c *Config) AEAD() *AEADConfig {
if c == nil {
return nil
}
return c.AEADConfig
}
func (c *Config) SigningKey() uint64 {
if c == nil {
return 0
}
return c.SigningKeyId
}

282
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/encrypted_key.go generated vendored Normal file
View file

@ -0,0 +1,282 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"crypto"
"crypto/rsa"
"encoding/binary"
"io"
"math/big"
"strconv"
"github.com/ProtonMail/go-crypto/openpgp/ecdh"
"github.com/ProtonMail/go-crypto/openpgp/elgamal"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
)
const encryptedKeyVersion = 3
// EncryptedKey represents a public-key encrypted session key. See RFC 4880,
// section 5.1.
type EncryptedKey struct {
KeyId uint64
Algo PublicKeyAlgorithm
CipherFunc CipherFunction // only valid after a successful Decrypt
Key []byte // only valid after a successful Decrypt
encryptedMPI1, encryptedMPI2 encoding.Field
}
func (e *EncryptedKey) parse(r io.Reader) (err error) {
var buf [10]byte
_, err = readFull(r, buf[:])
if err != nil {
return
}
if buf[0] != encryptedKeyVersion {
return errors.UnsupportedError("unknown EncryptedKey version " + strconv.Itoa(int(buf[0])))
}
e.KeyId = binary.BigEndian.Uint64(buf[1:9])
e.Algo = PublicKeyAlgorithm(buf[9])
switch e.Algo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
e.encryptedMPI1 = new(encoding.MPI)
if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
return
}
case PubKeyAlgoElGamal:
e.encryptedMPI1 = new(encoding.MPI)
if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
return
}
e.encryptedMPI2 = new(encoding.MPI)
if _, err = e.encryptedMPI2.ReadFrom(r); err != nil {
return
}
case PubKeyAlgoECDH:
e.encryptedMPI1 = new(encoding.MPI)
if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
return
}
e.encryptedMPI2 = new(encoding.OID)
if _, err = e.encryptedMPI2.ReadFrom(r); err != nil {
return
}
}
_, err = consumeAll(r)
return
}
func checksumKeyMaterial(key []byte) uint16 {
var checksum uint16
for _, v := range key {
checksum += uint16(v)
}
return checksum
}
// Decrypt decrypts an encrypted session key with the given private key. The
// private key must have been decrypted first.
// If config is nil, sensible defaults will be used.
func (e *EncryptedKey) Decrypt(priv *PrivateKey, config *Config) error {
if e.KeyId != 0 && e.KeyId != priv.KeyId {
return errors.InvalidArgumentError("cannot decrypt encrypted session key for key id " + strconv.FormatUint(e.KeyId, 16) + " with private key id " + strconv.FormatUint(priv.KeyId, 16))
}
if e.Algo != priv.PubKeyAlgo {
return errors.InvalidArgumentError("cannot decrypt encrypted session key of type " + strconv.Itoa(int(e.Algo)) + " with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
}
if priv.Dummy() {
return errors.ErrDummyPrivateKey("dummy key found")
}
var err error
var b []byte
// TODO(agl): use session key decryption routines here to avoid
// padding oracle attacks.
switch priv.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
// Supports both *rsa.PrivateKey and crypto.Decrypter
k := priv.PrivateKey.(crypto.Decrypter)
b, err = k.Decrypt(config.Random(), padToKeySize(k.Public().(*rsa.PublicKey), e.encryptedMPI1.Bytes()), nil)
case PubKeyAlgoElGamal:
c1 := new(big.Int).SetBytes(e.encryptedMPI1.Bytes())
c2 := new(big.Int).SetBytes(e.encryptedMPI2.Bytes())
b, err = elgamal.Decrypt(priv.PrivateKey.(*elgamal.PrivateKey), c1, c2)
case PubKeyAlgoECDH:
vsG := e.encryptedMPI1.Bytes()
m := e.encryptedMPI2.Bytes()
oid := priv.PublicKey.oid.EncodedBytes()
b, err = ecdh.Decrypt(priv.PrivateKey.(*ecdh.PrivateKey), vsG, m, oid, priv.PublicKey.Fingerprint[:])
default:
err = errors.InvalidArgumentError("cannot decrypt encrypted session key with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
}
if err != nil {
return err
}
e.CipherFunc = CipherFunction(b[0])
e.Key = b[1 : len(b)-2]
expectedChecksum := uint16(b[len(b)-2])<<8 | uint16(b[len(b)-1])
checksum := checksumKeyMaterial(e.Key)
if checksum != expectedChecksum {
return errors.StructuralError("EncryptedKey checksum incorrect")
}
return nil
}
// Serialize writes the encrypted key packet, e, to w.
func (e *EncryptedKey) Serialize(w io.Writer) error {
var mpiLen int
switch e.Algo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
mpiLen = int(e.encryptedMPI1.EncodedLength())
case PubKeyAlgoElGamal:
mpiLen = int(e.encryptedMPI1.EncodedLength()) + int(e.encryptedMPI2.EncodedLength())
case PubKeyAlgoECDH:
mpiLen = int(e.encryptedMPI1.EncodedLength()) + int(e.encryptedMPI2.EncodedLength())
default:
return errors.InvalidArgumentError("don't know how to serialize encrypted key type " + strconv.Itoa(int(e.Algo)))
}
err := serializeHeader(w, packetTypeEncryptedKey, 1 /* version */ +8 /* key id */ +1 /* algo */ +mpiLen)
if err != nil {
return err
}
w.Write([]byte{encryptedKeyVersion})
binary.Write(w, binary.BigEndian, e.KeyId)
w.Write([]byte{byte(e.Algo)})
switch e.Algo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
_, err := w.Write(e.encryptedMPI1.EncodedBytes())
return err
case PubKeyAlgoElGamal:
if _, err := w.Write(e.encryptedMPI1.EncodedBytes()); err != nil {
return err
}
_, err := w.Write(e.encryptedMPI2.EncodedBytes())
return err
case PubKeyAlgoECDH:
if _, err := w.Write(e.encryptedMPI1.EncodedBytes()); err != nil {
return err
}
_, err := w.Write(e.encryptedMPI2.EncodedBytes())
return err
default:
panic("internal error")
}
}
// SerializeEncryptedKey serializes an encrypted key packet to w that contains
// key, encrypted to pub.
// If config is nil, sensible defaults will be used.
func SerializeEncryptedKey(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, key []byte, config *Config) error {
var buf [10]byte
buf[0] = encryptedKeyVersion
binary.BigEndian.PutUint64(buf[1:9], pub.KeyId)
buf[9] = byte(pub.PubKeyAlgo)
keyBlock := make([]byte, 1 /* cipher type */ +len(key)+2 /* checksum */)
keyBlock[0] = byte(cipherFunc)
copy(keyBlock[1:], key)
checksum := checksumKeyMaterial(key)
keyBlock[1+len(key)] = byte(checksum >> 8)
keyBlock[1+len(key)+1] = byte(checksum)
switch pub.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
return serializeEncryptedKeyRSA(w, config.Random(), buf, pub.PublicKey.(*rsa.PublicKey), keyBlock)
case PubKeyAlgoElGamal:
return serializeEncryptedKeyElGamal(w, config.Random(), buf, pub.PublicKey.(*elgamal.PublicKey), keyBlock)
case PubKeyAlgoECDH:
return serializeEncryptedKeyECDH(w, config.Random(), buf, pub.PublicKey.(*ecdh.PublicKey), keyBlock, pub.oid, pub.Fingerprint)
case PubKeyAlgoDSA, PubKeyAlgoRSASignOnly:
return errors.InvalidArgumentError("cannot encrypt to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
}
return errors.UnsupportedError("encrypting a key to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
}
func serializeEncryptedKeyRSA(w io.Writer, rand io.Reader, header [10]byte, pub *rsa.PublicKey, keyBlock []byte) error {
cipherText, err := rsa.EncryptPKCS1v15(rand, pub, keyBlock)
if err != nil {
return errors.InvalidArgumentError("RSA encryption failed: " + err.Error())
}
cipherMPI := encoding.NewMPI(cipherText)
packetLen := 10 /* header length */ + int(cipherMPI.EncodedLength())
err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
if err != nil {
return err
}
_, err = w.Write(header[:])
if err != nil {
return err
}
_, err = w.Write(cipherMPI.EncodedBytes())
return err
}
func serializeEncryptedKeyElGamal(w io.Writer, rand io.Reader, header [10]byte, pub *elgamal.PublicKey, keyBlock []byte) error {
c1, c2, err := elgamal.Encrypt(rand, pub, keyBlock)
if err != nil {
return errors.InvalidArgumentError("ElGamal encryption failed: " + err.Error())
}
packetLen := 10 /* header length */
packetLen += 2 /* mpi size */ + (c1.BitLen()+7)/8
packetLen += 2 /* mpi size */ + (c2.BitLen()+7)/8
err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
if err != nil {
return err
}
_, err = w.Write(header[:])
if err != nil {
return err
}
if _, err = w.Write(new(encoding.MPI).SetBig(c1).EncodedBytes()); err != nil {
return err
}
_, err = w.Write(new(encoding.MPI).SetBig(c2).EncodedBytes())
return err
}
func serializeEncryptedKeyECDH(w io.Writer, rand io.Reader, header [10]byte, pub *ecdh.PublicKey, keyBlock []byte, oid encoding.Field, fingerprint []byte) error {
vsG, c, err := ecdh.Encrypt(rand, pub, keyBlock, oid.EncodedBytes(), fingerprint)
if err != nil {
return errors.InvalidArgumentError("ECDH encryption failed: " + err.Error())
}
g := encoding.NewMPI(vsG)
m := encoding.NewOID(c)
packetLen := 10 /* header length */
packetLen += int(g.EncodedLength()) + int(m.EncodedLength())
err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
if err != nil {
return err
}
_, err = w.Write(header[:])
if err != nil {
return err
}
if _, err = w.Write(g.EncodedBytes()); err != nil {
return err
}
_, err = w.Write(m.EncodedBytes())
return err
}

91
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/literal.go generated vendored Normal file
View file

@ -0,0 +1,91 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"encoding/binary"
"io"
)
// LiteralData represents an encrypted file. See RFC 4880, section 5.9.
type LiteralData struct {
Format uint8
IsBinary bool
FileName string
Time uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
Body io.Reader
}
// ForEyesOnly returns whether the contents of the LiteralData have been marked
// as especially sensitive.
func (l *LiteralData) ForEyesOnly() bool {
return l.FileName == "_CONSOLE"
}
func (l *LiteralData) parse(r io.Reader) (err error) {
var buf [256]byte
_, err = readFull(r, buf[:2])
if err != nil {
return
}
l.Format = buf[0]
l.IsBinary = l.Format == 'b'
fileNameLen := int(buf[1])
_, err = readFull(r, buf[:fileNameLen])
if err != nil {
return
}
l.FileName = string(buf[:fileNameLen])
_, err = readFull(r, buf[:4])
if err != nil {
return
}
l.Time = binary.BigEndian.Uint32(buf[:4])
l.Body = r
return
}
// SerializeLiteral serializes a literal data packet to w and returns a
// WriteCloser to which the data itself can be written and which MUST be closed
// on completion. The fileName is truncated to 255 bytes.
func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uint32) (plaintext io.WriteCloser, err error) {
var buf [4]byte
buf[0] = 't'
if isBinary {
buf[0] = 'b'
}
if len(fileName) > 255 {
fileName = fileName[:255]
}
buf[1] = byte(len(fileName))
inner, err := serializeStreamHeader(w, packetTypeLiteralData)
if err != nil {
return
}
_, err = inner.Write(buf[:2])
if err != nil {
return
}
_, err = inner.Write([]byte(fileName))
if err != nil {
return
}
binary.BigEndian.PutUint32(buf[:], time)
_, err = inner.Write(buf[:])
if err != nil {
return
}
plaintext = inner
return
}

137
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/ocfb.go generated vendored Normal file
View file

@ -0,0 +1,137 @@
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// OpenPGP CFB Mode. http://tools.ietf.org/html/rfc4880#section-13.9
package packet
import (
"crypto/cipher"
)
type ocfbEncrypter struct {
b cipher.Block
fre []byte
outUsed int
}
// An OCFBResyncOption determines if the "resynchronization step" of OCFB is
// performed.
type OCFBResyncOption bool
const (
OCFBResync OCFBResyncOption = true
OCFBNoResync OCFBResyncOption = false
)
// NewOCFBEncrypter returns a cipher.Stream which encrypts data with OpenPGP's
// cipher feedback mode using the given cipher.Block, and an initial amount of
// ciphertext. randData must be random bytes and be the same length as the
// cipher.Block's block size. Resync determines if the "resynchronization step"
// from RFC 4880, 13.9 step 7 is performed. Different parts of OpenPGP vary on
// this point.
func NewOCFBEncrypter(block cipher.Block, randData []byte, resync OCFBResyncOption) (cipher.Stream, []byte) {
blockSize := block.BlockSize()
if len(randData) != blockSize {
return nil, nil
}
x := &ocfbEncrypter{
b: block,
fre: make([]byte, blockSize),
outUsed: 0,
}
prefix := make([]byte, blockSize+2)
block.Encrypt(x.fre, x.fre)
for i := 0; i < blockSize; i++ {
prefix[i] = randData[i] ^ x.fre[i]
}
block.Encrypt(x.fre, prefix[:blockSize])
prefix[blockSize] = x.fre[0] ^ randData[blockSize-2]
prefix[blockSize+1] = x.fre[1] ^ randData[blockSize-1]
if resync {
block.Encrypt(x.fre, prefix[2:])
} else {
x.fre[0] = prefix[blockSize]
x.fre[1] = prefix[blockSize+1]
x.outUsed = 2
}
return x, prefix
}
func (x *ocfbEncrypter) XORKeyStream(dst, src []byte) {
for i := 0; i < len(src); i++ {
if x.outUsed == len(x.fre) {
x.b.Encrypt(x.fre, x.fre)
x.outUsed = 0
}
x.fre[x.outUsed] ^= src[i]
dst[i] = x.fre[x.outUsed]
x.outUsed++
}
}
type ocfbDecrypter struct {
b cipher.Block
fre []byte
outUsed int
}
// NewOCFBDecrypter returns a cipher.Stream which decrypts data with OpenPGP's
// cipher feedback mode using the given cipher.Block. Prefix must be the first
// blockSize + 2 bytes of the ciphertext, where blockSize is the cipher.Block's
// block size. On successful exit, blockSize+2 bytes of decrypted data are written into
// prefix. Resync determines if the "resynchronization step" from RFC 4880,
// 13.9 step 7 is performed. Different parts of OpenPGP vary on this point.
func NewOCFBDecrypter(block cipher.Block, prefix []byte, resync OCFBResyncOption) cipher.Stream {
blockSize := block.BlockSize()
if len(prefix) != blockSize+2 {
return nil
}
x := &ocfbDecrypter{
b: block,
fre: make([]byte, blockSize),
outUsed: 0,
}
prefixCopy := make([]byte, len(prefix))
copy(prefixCopy, prefix)
block.Encrypt(x.fre, x.fre)
for i := 0; i < blockSize; i++ {
prefixCopy[i] ^= x.fre[i]
}
block.Encrypt(x.fre, prefix[:blockSize])
prefixCopy[blockSize] ^= x.fre[0]
prefixCopy[blockSize+1] ^= x.fre[1]
if resync {
block.Encrypt(x.fre, prefix[2:])
} else {
x.fre[0] = prefix[blockSize]
x.fre[1] = prefix[blockSize+1]
x.outUsed = 2
}
copy(prefix, prefixCopy)
return x
}
func (x *ocfbDecrypter) XORKeyStream(dst, src []byte) {
for i := 0; i < len(src); i++ {
if x.outUsed == len(x.fre) {
x.b.Encrypt(x.fre, x.fre)
x.outUsed = 0
}
c := src[i]
dst[i] = x.fre[x.outUsed] ^ src[i]
x.fre[x.outUsed] = c
x.outUsed++
}
}

73
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/one_pass_signature.go generated vendored Normal file
View file

@ -0,0 +1,73 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"crypto"
"encoding/binary"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/s2k"
"io"
"strconv"
)
// OnePassSignature represents a one-pass signature packet. See RFC 4880,
// section 5.4.
type OnePassSignature struct {
SigType SignatureType
Hash crypto.Hash
PubKeyAlgo PublicKeyAlgorithm
KeyId uint64
IsLast bool
}
const onePassSignatureVersion = 3
func (ops *OnePassSignature) parse(r io.Reader) (err error) {
var buf [13]byte
_, err = readFull(r, buf[:])
if err != nil {
return
}
if buf[0] != onePassSignatureVersion {
err = errors.UnsupportedError("one-pass-signature packet version " + strconv.Itoa(int(buf[0])))
}
var ok bool
ops.Hash, ok = s2k.HashIdToHash(buf[2])
if !ok {
return errors.UnsupportedError("hash function: " + strconv.Itoa(int(buf[2])))
}
ops.SigType = SignatureType(buf[1])
ops.PubKeyAlgo = PublicKeyAlgorithm(buf[3])
ops.KeyId = binary.BigEndian.Uint64(buf[4:12])
ops.IsLast = buf[12] != 0
return
}
// Serialize marshals the given OnePassSignature to w.
func (ops *OnePassSignature) Serialize(w io.Writer) error {
var buf [13]byte
buf[0] = onePassSignatureVersion
buf[1] = uint8(ops.SigType)
var ok bool
buf[2], ok = s2k.HashToHashId(ops.Hash)
if !ok {
return errors.UnsupportedError("hash type: " + strconv.Itoa(int(ops.Hash)))
}
buf[3] = uint8(ops.PubKeyAlgo)
binary.BigEndian.PutUint64(buf[4:12], ops.KeyId)
if ops.IsLast {
buf[12] = 1
}
if err := serializeHeader(w, packetTypeOnePassSignature, len(buf)); err != nil {
return err
}
_, err := w.Write(buf[:])
return err
}

162
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/opaque.go generated vendored Normal file
View file

@ -0,0 +1,162 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"bytes"
"io"
"io/ioutil"
"github.com/ProtonMail/go-crypto/openpgp/errors"
)
// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is
// useful for splitting and storing the original packet contents separately,
// handling unsupported packet types or accessing parts of the packet not yet
// implemented by this package.
type OpaquePacket struct {
// Packet type
Tag uint8
// Reason why the packet was parsed opaquely
Reason error
// Binary contents of the packet data
Contents []byte
}
func (op *OpaquePacket) parse(r io.Reader) (err error) {
op.Contents, err = ioutil.ReadAll(r)
return
}
// Serialize marshals the packet to a writer in its original form, including
// the packet header.
func (op *OpaquePacket) Serialize(w io.Writer) (err error) {
err = serializeHeader(w, packetType(op.Tag), len(op.Contents))
if err == nil {
_, err = w.Write(op.Contents)
}
return
}
// Parse attempts to parse the opaque contents into a structure supported by
// this package. If the packet is not known then the result will be another
// OpaquePacket.
func (op *OpaquePacket) Parse() (p Packet, err error) {
hdr := bytes.NewBuffer(nil)
err = serializeHeader(hdr, packetType(op.Tag), len(op.Contents))
if err != nil {
op.Reason = err
return op, err
}
p, err = Read(io.MultiReader(hdr, bytes.NewBuffer(op.Contents)))
if err != nil {
op.Reason = err
p = op
}
return
}
// OpaqueReader reads OpaquePackets from an io.Reader.
type OpaqueReader struct {
r io.Reader
}
func NewOpaqueReader(r io.Reader) *OpaqueReader {
return &OpaqueReader{r: r}
}
// Read the next OpaquePacket.
func (or *OpaqueReader) Next() (op *OpaquePacket, err error) {
tag, _, contents, err := readHeader(or.r)
if err != nil {
return
}
op = &OpaquePacket{Tag: uint8(tag), Reason: err}
err = op.parse(contents)
if err != nil {
consumeAll(contents)
}
return
}
// OpaqueSubpacket represents an unparsed OpenPGP subpacket,
// as found in signature and user attribute packets.
type OpaqueSubpacket struct {
SubType uint8
Contents []byte
}
// OpaqueSubpackets extracts opaque, unparsed OpenPGP subpackets from
// their byte representation.
func OpaqueSubpackets(contents []byte) (result []*OpaqueSubpacket, err error) {
var (
subHeaderLen int
subPacket *OpaqueSubpacket
)
for len(contents) > 0 {
subHeaderLen, subPacket, err = nextSubpacket(contents)
if err != nil {
break
}
result = append(result, subPacket)
contents = contents[subHeaderLen+len(subPacket.Contents):]
}
return
}
func nextSubpacket(contents []byte) (subHeaderLen int, subPacket *OpaqueSubpacket, err error) {
// RFC 4880, section 5.2.3.1
var subLen uint32
if len(contents) < 1 {
goto Truncated
}
subPacket = &OpaqueSubpacket{}
switch {
case contents[0] < 192:
subHeaderLen = 2 // 1 length byte, 1 subtype byte
if len(contents) < subHeaderLen {
goto Truncated
}
subLen = uint32(contents[0])
contents = contents[1:]
case contents[0] < 255:
subHeaderLen = 3 // 2 length bytes, 1 subtype
if len(contents) < subHeaderLen {
goto Truncated
}
subLen = uint32(contents[0]-192)<<8 + uint32(contents[1]) + 192
contents = contents[2:]
default:
subHeaderLen = 6 // 5 length bytes, 1 subtype
if len(contents) < subHeaderLen {
goto Truncated
}
subLen = uint32(contents[1])<<24 |
uint32(contents[2])<<16 |
uint32(contents[3])<<8 |
uint32(contents[4])
contents = contents[5:]
}
if subLen > uint32(len(contents)) || subLen == 0 {
goto Truncated
}
subPacket.SubType = contents[0]
subPacket.Contents = contents[1:subLen]
return
Truncated:
err = errors.StructuralError("subpacket truncated")
return
}
func (osp *OpaqueSubpacket) Serialize(w io.Writer) (err error) {
buf := make([]byte, 6)
n := serializeSubpacketLength(buf, len(osp.Contents)+1)
buf[n] = osp.SubType
if _, err = w.Write(buf[:n+1]); err != nil {
return
}
_, err = w.Write(osp.Contents)
return
}

522
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/packet.go generated vendored Normal file
View file

@ -0,0 +1,522 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package packet implements parsing and serialization of OpenPGP packets, as
// specified in RFC 4880.
package packet // import "github.com/ProtonMail/go-crypto/openpgp/packet"
import (
"bytes"
"crypto/cipher"
"crypto/rsa"
"io"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
)
// readFull is the same as io.ReadFull except that reading zero bytes returns
// ErrUnexpectedEOF rather than EOF.
func readFull(r io.Reader, buf []byte) (n int, err error) {
n, err = io.ReadFull(r, buf)
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return
}
// readLength reads an OpenPGP length from r. See RFC 4880, section 4.2.2.
func readLength(r io.Reader) (length int64, isPartial bool, err error) {
var buf [4]byte
_, err = readFull(r, buf[:1])
if err != nil {
return
}
switch {
case buf[0] < 192:
length = int64(buf[0])
case buf[0] < 224:
length = int64(buf[0]-192) << 8
_, err = readFull(r, buf[0:1])
if err != nil {
return
}
length += int64(buf[0]) + 192
case buf[0] < 255:
length = int64(1) << (buf[0] & 0x1f)
isPartial = true
default:
_, err = readFull(r, buf[0:4])
if err != nil {
return
}
length = int64(buf[0])<<24 |
int64(buf[1])<<16 |
int64(buf[2])<<8 |
int64(buf[3])
}
return
}
// partialLengthReader wraps an io.Reader and handles OpenPGP partial lengths.
// The continuation lengths are parsed and removed from the stream and EOF is
// returned at the end of the packet. See RFC 4880, section 4.2.2.4.
type partialLengthReader struct {
r io.Reader
remaining int64
isPartial bool
}
func (r *partialLengthReader) Read(p []byte) (n int, err error) {
for r.remaining == 0 {
if !r.isPartial {
return 0, io.EOF
}
r.remaining, r.isPartial, err = readLength(r.r)
if err != nil {
return 0, err
}
}
toRead := int64(len(p))
if toRead > r.remaining {
toRead = r.remaining
}
n, err = r.r.Read(p[:int(toRead)])
r.remaining -= int64(n)
if n < int(toRead) && err == io.EOF {
err = io.ErrUnexpectedEOF
}
return
}
// partialLengthWriter writes a stream of data using OpenPGP partial lengths.
// See RFC 4880, section 4.2.2.4.
type partialLengthWriter struct {
w io.WriteCloser
buf bytes.Buffer
lengthByte [1]byte
}
func (w *partialLengthWriter) Write(p []byte) (n int, err error) {
bufLen := w.buf.Len()
if bufLen > 512 {
for power := uint(30); ; power-- {
l := 1 << power
if bufLen >= l {
w.lengthByte[0] = 224 + uint8(power)
_, err = w.w.Write(w.lengthByte[:])
if err != nil {
return
}
var m int
m, err = w.w.Write(w.buf.Next(l))
if err != nil {
return
}
if m != l {
return 0, io.ErrShortWrite
}
break
}
}
}
return w.buf.Write(p)
}
func (w *partialLengthWriter) Close() (err error) {
len := w.buf.Len()
err = serializeLength(w.w, len)
if err != nil {
return err
}
_, err = w.buf.WriteTo(w.w)
if err != nil {
return err
}
return w.w.Close()
}
// A spanReader is an io.LimitReader, but it returns ErrUnexpectedEOF if the
// underlying Reader returns EOF before the limit has been reached.
type spanReader struct {
r io.Reader
n int64
}
func (l *spanReader) Read(p []byte) (n int, err error) {
if l.n <= 0 {
return 0, io.EOF
}
if int64(len(p)) > l.n {
p = p[0:l.n]
}
n, err = l.r.Read(p)
l.n -= int64(n)
if l.n > 0 && err == io.EOF {
err = io.ErrUnexpectedEOF
}
return
}
// readHeader parses a packet header and returns an io.Reader which will return
// the contents of the packet. See RFC 4880, section 4.2.
func readHeader(r io.Reader) (tag packetType, length int64, contents io.Reader, err error) {
var buf [4]byte
_, err = io.ReadFull(r, buf[:1])
if err != nil {
return
}
if buf[0]&0x80 == 0 {
err = errors.StructuralError("tag byte does not have MSB set")
return
}
if buf[0]&0x40 == 0 {
// Old format packet
tag = packetType((buf[0] & 0x3f) >> 2)
lengthType := buf[0] & 3
if lengthType == 3 {
length = -1
contents = r
return
}
lengthBytes := 1 << lengthType
_, err = readFull(r, buf[0:lengthBytes])
if err != nil {
return
}
for i := 0; i < lengthBytes; i++ {
length <<= 8
length |= int64(buf[i])
}
contents = &spanReader{r, length}
return
}
// New format packet
tag = packetType(buf[0] & 0x3f)
length, isPartial, err := readLength(r)
if err != nil {
return
}
if isPartial {
contents = &partialLengthReader{
remaining: length,
isPartial: true,
r: r,
}
length = -1
} else {
contents = &spanReader{r, length}
}
return
}
// serializeHeader writes an OpenPGP packet header to w. See RFC 4880, section
// 4.2.
func serializeHeader(w io.Writer, ptype packetType, length int) (err error) {
err = serializeType(w, ptype)
if err != nil {
return
}
return serializeLength(w, length)
}
// serializeType writes an OpenPGP packet type to w. See RFC 4880, section
// 4.2.
func serializeType(w io.Writer, ptype packetType) (err error) {
var buf [1]byte
buf[0] = 0x80 | 0x40 | byte(ptype)
_, err = w.Write(buf[:])
return
}
// serializeLength writes an OpenPGP packet length to w. See RFC 4880, section
// 4.2.2.
func serializeLength(w io.Writer, length int) (err error) {
var buf [5]byte
var n int
if length < 192 {
buf[0] = byte(length)
n = 1
} else if length < 8384 {
length -= 192
buf[0] = 192 + byte(length>>8)
buf[1] = byte(length)
n = 2
} else {
buf[0] = 255
buf[1] = byte(length >> 24)
buf[2] = byte(length >> 16)
buf[3] = byte(length >> 8)
buf[4] = byte(length)
n = 5
}
_, err = w.Write(buf[:n])
return
}
// serializeStreamHeader writes an OpenPGP packet header to w where the
// length of the packet is unknown. It returns a io.WriteCloser which can be
// used to write the contents of the packet. See RFC 4880, section 4.2.
func serializeStreamHeader(w io.WriteCloser, ptype packetType) (out io.WriteCloser, err error) {
err = serializeType(w, ptype)
if err != nil {
return
}
out = &partialLengthWriter{w: w}
return
}
// Packet represents an OpenPGP packet. Users are expected to try casting
// instances of this interface to specific packet types.
type Packet interface {
parse(io.Reader) error
}
// consumeAll reads from the given Reader until error, returning the number of
// bytes read.
func consumeAll(r io.Reader) (n int64, err error) {
var m int
var buf [1024]byte
for {
m, err = r.Read(buf[:])
n += int64(m)
if err == io.EOF {
err = nil
return
}
if err != nil {
return
}
}
}
// packetType represents the numeric ids of the different OpenPGP packet types. See
// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-2
type packetType uint8
const (
packetTypeEncryptedKey packetType = 1
packetTypeSignature packetType = 2
packetTypeSymmetricKeyEncrypted packetType = 3
packetTypeOnePassSignature packetType = 4
packetTypePrivateKey packetType = 5
packetTypePublicKey packetType = 6
packetTypePrivateSubkey packetType = 7
packetTypeCompressed packetType = 8
packetTypeSymmetricallyEncrypted packetType = 9
packetTypeLiteralData packetType = 11
packetTypeUserId packetType = 13
packetTypePublicSubkey packetType = 14
packetTypeUserAttribute packetType = 17
packetTypeSymmetricallyEncryptedMDC packetType = 18
packetTypeAEADEncrypted packetType = 20
)
// EncryptedDataPacket holds encrypted data. It is currently implemented by
// SymmetricallyEncrypted and AEADEncrypted.
type EncryptedDataPacket interface {
Decrypt(CipherFunction, []byte) (io.ReadCloser, error)
}
// Read reads a single OpenPGP packet from the given io.Reader. If there is an
// error parsing a packet, the whole packet is consumed from the input.
func Read(r io.Reader) (p Packet, err error) {
tag, _, contents, err := readHeader(r)
if err != nil {
return
}
switch tag {
case packetTypeEncryptedKey:
p = new(EncryptedKey)
case packetTypeSignature:
p = new(Signature)
case packetTypeSymmetricKeyEncrypted:
p = new(SymmetricKeyEncrypted)
case packetTypeOnePassSignature:
p = new(OnePassSignature)
case packetTypePrivateKey, packetTypePrivateSubkey:
pk := new(PrivateKey)
if tag == packetTypePrivateSubkey {
pk.IsSubkey = true
}
p = pk
case packetTypePublicKey, packetTypePublicSubkey:
isSubkey := tag == packetTypePublicSubkey
p = &PublicKey{IsSubkey: isSubkey}
case packetTypeCompressed:
p = new(Compressed)
case packetTypeSymmetricallyEncrypted:
err = errors.UnsupportedError("Symmetrically encrypted packets without MDC are not supported")
case packetTypeLiteralData:
p = new(LiteralData)
case packetTypeUserId:
p = new(UserId)
case packetTypeUserAttribute:
p = new(UserAttribute)
case packetTypeSymmetricallyEncryptedMDC:
se := new(SymmetricallyEncrypted)
se.MDC = true
p = se
case packetTypeAEADEncrypted:
p = new(AEADEncrypted)
default:
err = errors.UnknownPacketTypeError(tag)
}
if p != nil {
err = p.parse(contents)
}
if err != nil {
consumeAll(contents)
}
return
}
// SignatureType represents the different semantic meanings of an OpenPGP
// signature. See RFC 4880, section 5.2.1.
type SignatureType uint8
const (
SigTypeBinary SignatureType = 0x00
SigTypeText = 0x01
SigTypeGenericCert = 0x10
SigTypePersonaCert = 0x11
SigTypeCasualCert = 0x12
SigTypePositiveCert = 0x13
SigTypeSubkeyBinding = 0x18
SigTypePrimaryKeyBinding = 0x19
SigTypeDirectSignature = 0x1F
SigTypeKeyRevocation = 0x20
SigTypeSubkeyRevocation = 0x28
)
// PublicKeyAlgorithm represents the different public key system specified for
// OpenPGP. See
// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-12
type PublicKeyAlgorithm uint8
const (
PubKeyAlgoRSA PublicKeyAlgorithm = 1
PubKeyAlgoElGamal PublicKeyAlgorithm = 16
PubKeyAlgoDSA PublicKeyAlgorithm = 17
// RFC 6637, Section 5.
PubKeyAlgoECDH PublicKeyAlgorithm = 18
PubKeyAlgoECDSA PublicKeyAlgorithm = 19
// https://www.ietf.org/archive/id/draft-koch-eddsa-for-openpgp-04.txt
PubKeyAlgoEdDSA PublicKeyAlgorithm = 22
// Deprecated in RFC 4880, Section 13.5. Use key flags instead.
PubKeyAlgoRSAEncryptOnly PublicKeyAlgorithm = 2
PubKeyAlgoRSASignOnly PublicKeyAlgorithm = 3
)
// CanEncrypt returns true if it's possible to encrypt a message to a public
// key of the given type.
func (pka PublicKeyAlgorithm) CanEncrypt() bool {
switch pka {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal, PubKeyAlgoECDH:
return true
}
return false
}
// CanSign returns true if it's possible for a public key of the given type to
// sign a message.
func (pka PublicKeyAlgorithm) CanSign() bool {
switch pka {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA, PubKeyAlgoEdDSA:
return true
}
return false
}
// CipherFunction represents the different block ciphers specified for OpenPGP. See
// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-13
type CipherFunction algorithm.CipherFunction
const (
Cipher3DES CipherFunction = 2
CipherCAST5 CipherFunction = 3
CipherAES128 CipherFunction = 7
CipherAES192 CipherFunction = 8
CipherAES256 CipherFunction = 9
)
// KeySize returns the key size, in bytes, of cipher.
func (cipher CipherFunction) KeySize() int {
return algorithm.CipherFunction(cipher).KeySize()
}
// blockSize returns the block size, in bytes, of cipher.
func (cipher CipherFunction) blockSize() int {
return algorithm.CipherFunction(cipher).BlockSize()
}
// new returns a fresh instance of the given cipher.
func (cipher CipherFunction) new(key []byte) (block cipher.Block) {
return algorithm.CipherFunction(cipher).New(key)
}
// padToKeySize left-pads a MPI with zeroes to match the length of the
// specified RSA public.
func padToKeySize(pub *rsa.PublicKey, b []byte) []byte {
k := (pub.N.BitLen() + 7) / 8
if len(b) >= k {
return b
}
bb := make([]byte, k)
copy(bb[len(bb)-len(b):], b)
return bb
}
// CompressionAlgo Represents the different compression algorithms
// supported by OpenPGP (except for BZIP2, which is not currently
// supported). See Section 9.3 of RFC 4880.
type CompressionAlgo uint8
const (
CompressionNone CompressionAlgo = 0
CompressionZIP CompressionAlgo = 1
CompressionZLIB CompressionAlgo = 2
)
// AEADMode represents the different Authenticated Encryption with Associated
// Data specified for OpenPGP.
type AEADMode algorithm.AEADMode
const (
AEADModeEAX AEADMode = 1
AEADModeOCB AEADMode = 2
AEADModeExperimentalGCM AEADMode = 100
)
func (mode AEADMode) NonceLength() int {
return algorithm.AEADMode(mode).NonceLength()
}
func (mode AEADMode) TagLength() int {
return algorithm.AEADMode(mode).TagLength()
}
// new returns a fresh instance of the given mode.
func (mode AEADMode) new(block cipher.Block) cipher.AEAD {
return algorithm.AEADMode(mode).New(block)
}
// ReasonForRevocation represents a revocation reason code as per RFC4880
// section 5.2.3.23.
type ReasonForRevocation uint8
const (
NoReason ReasonForRevocation = 0
KeySuperseded ReasonForRevocation = 1
KeyCompromised ReasonForRevocation = 2
KeyRetired ReasonForRevocation = 3
)

780
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/private_key.go generated vendored Normal file
View file

@ -0,0 +1,780 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"bytes"
"crypto"
"crypto/cipher"
"crypto/dsa"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"fmt"
"io"
"io/ioutil"
"math/big"
"strconv"
"time"
"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
"golang.org/x/crypto/curve25519"
"github.com/ProtonMail/go-crypto/openpgp/ecdh"
"github.com/ProtonMail/go-crypto/openpgp/elgamal"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
"github.com/ProtonMail/go-crypto/openpgp/s2k"
"golang.org/x/crypto/ed25519"
)
// PrivateKey represents a possibly encrypted private key. See RFC 4880,
// section 5.5.3.
type PrivateKey struct {
PublicKey
Encrypted bool // if true then the private key is unavailable until Decrypt has been called.
encryptedData []byte
cipher CipherFunction
s2k func(out, in []byte)
// An *{rsa|dsa|elgamal|ecdh|ecdsa|ed25519}.PrivateKey or
// crypto.Signer/crypto.Decrypter (Decryptor RSA only).
PrivateKey interface{}
sha1Checksum bool
iv []byte
// Type of encryption of the S2K packet
// Allowed values are 0 (Not encrypted), 254 (SHA1), or
// 255 (2-byte checksum)
s2kType S2KType
// Full parameters of the S2K packet
s2kParams *s2k.Params
}
//S2KType s2k packet type
type S2KType uint8
const (
// S2KNON unencrypt
S2KNON S2KType = 0
// S2KSHA1 sha1 sum check
S2KSHA1 S2KType = 254
// S2KCHECKSUM sum check
S2KCHECKSUM S2KType = 255
)
func NewRSAPrivateKey(creationTime time.Time, priv *rsa.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pk.PublicKey = *NewRSAPublicKey(creationTime, &priv.PublicKey)
pk.PrivateKey = priv
return pk
}
func NewDSAPrivateKey(creationTime time.Time, priv *dsa.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pk.PublicKey = *NewDSAPublicKey(creationTime, &priv.PublicKey)
pk.PrivateKey = priv
return pk
}
func NewElGamalPrivateKey(creationTime time.Time, priv *elgamal.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pk.PublicKey = *NewElGamalPublicKey(creationTime, &priv.PublicKey)
pk.PrivateKey = priv
return pk
}
func NewECDSAPrivateKey(creationTime time.Time, priv *ecdsa.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pk.PublicKey = *NewECDSAPublicKey(creationTime, &priv.PublicKey)
pk.PrivateKey = priv
return pk
}
func NewEdDSAPrivateKey(creationTime time.Time, priv *ed25519.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pub := priv.Public().(ed25519.PublicKey)
pk.PublicKey = *NewEdDSAPublicKey(creationTime, &pub)
pk.PrivateKey = priv
return pk
}
func NewECDHPrivateKey(creationTime time.Time, priv *ecdh.PrivateKey) *PrivateKey {
pk := new(PrivateKey)
pk.PublicKey = *NewECDHPublicKey(creationTime, &priv.PublicKey)
pk.PrivateKey = priv
return pk
}
// NewSignerPrivateKey creates a PrivateKey from a crypto.Signer that
// implements RSA, ECDSA or EdDSA.
func NewSignerPrivateKey(creationTime time.Time, signer crypto.Signer) *PrivateKey {
pk := new(PrivateKey)
// In general, the public Keys should be used as pointers. We still
// type-switch on the values, for backwards-compatibility.
switch pubkey := signer.Public().(type) {
case *rsa.PublicKey:
pk.PublicKey = *NewRSAPublicKey(creationTime, pubkey)
case rsa.PublicKey:
pk.PublicKey = *NewRSAPublicKey(creationTime, &pubkey)
case *ecdsa.PublicKey:
pk.PublicKey = *NewECDSAPublicKey(creationTime, pubkey)
case ecdsa.PublicKey:
pk.PublicKey = *NewECDSAPublicKey(creationTime, &pubkey)
case *ed25519.PublicKey:
pk.PublicKey = *NewEdDSAPublicKey(creationTime, pubkey)
case ed25519.PublicKey:
pk.PublicKey = *NewEdDSAPublicKey(creationTime, &pubkey)
default:
panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey")
}
pk.PrivateKey = signer
return pk
}
// NewDecrypterPrivateKey creates a PrivateKey from a *{rsa|elgamal|ecdh}.PrivateKey.
func NewDecrypterPrivateKey(creationTime time.Time, decrypter interface{}) *PrivateKey {
pk := new(PrivateKey)
switch priv := decrypter.(type) {
case *rsa.PrivateKey:
pk.PublicKey = *NewRSAPublicKey(creationTime, &priv.PublicKey)
case *elgamal.PrivateKey:
pk.PublicKey = *NewElGamalPublicKey(creationTime, &priv.PublicKey)
case *ecdh.PrivateKey:
pk.PublicKey = *NewECDHPublicKey(creationTime, &priv.PublicKey)
default:
panic("openpgp: unknown decrypter type in NewDecrypterPrivateKey")
}
pk.PrivateKey = decrypter
return pk
}
func (pk *PrivateKey) parse(r io.Reader) (err error) {
err = (&pk.PublicKey).parse(r)
if err != nil {
return
}
v5 := pk.PublicKey.Version == 5
var buf [1]byte
_, err = readFull(r, buf[:])
if err != nil {
return
}
pk.s2kType = S2KType(buf[0])
var optCount [1]byte
if v5 {
if _, err = readFull(r, optCount[:]); err != nil {
return
}
}
switch pk.s2kType {
case S2KNON:
pk.s2k = nil
pk.Encrypted = false
case S2KSHA1, S2KCHECKSUM:
if v5 && pk.s2kType == S2KCHECKSUM {
return errors.StructuralError("wrong s2k identifier for version 5")
}
_, err = readFull(r, buf[:])
if err != nil {
return
}
pk.cipher = CipherFunction(buf[0])
pk.s2kParams, err = s2k.ParseIntoParams(r)
if err != nil {
return
}
if pk.s2kParams.Dummy() {
return
}
pk.s2k, err = pk.s2kParams.Function()
if err != nil {
return
}
pk.Encrypted = true
if pk.s2kType == S2KSHA1 {
pk.sha1Checksum = true
}
default:
return errors.UnsupportedError("deprecated s2k function in private key")
}
if pk.Encrypted {
blockSize := pk.cipher.blockSize()
if blockSize == 0 {
return errors.UnsupportedError("unsupported cipher in private key: " + strconv.Itoa(int(pk.cipher)))
}
pk.iv = make([]byte, blockSize)
_, err = readFull(r, pk.iv)
if err != nil {
return
}
}
var privateKeyData []byte
if v5 {
var n [4]byte /* secret material four octet count */
_, err = readFull(r, n[:])
if err != nil {
return
}
count := uint32(uint32(n[0])<<24 | uint32(n[1])<<16 | uint32(n[2])<<8 | uint32(n[3]))
if !pk.Encrypted {
count = count + 2 /* two octet checksum */
}
privateKeyData = make([]byte, count)
_, err = readFull(r, privateKeyData)
if err != nil {
return
}
} else {
privateKeyData, err = ioutil.ReadAll(r)
if err != nil {
return
}
}
if !pk.Encrypted {
return pk.parsePrivateKey(privateKeyData)
}
pk.encryptedData = privateKeyData
return
}
// Dummy returns true if the private key is a dummy key. This is a GNU extension.
func (pk *PrivateKey) Dummy() bool {
return pk.s2kParams.Dummy()
}
func mod64kHash(d []byte) uint16 {
var h uint16
for _, b := range d {
h += uint16(b)
}
return h
}
func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
contents := bytes.NewBuffer(nil)
err = pk.PublicKey.serializeWithoutHeaders(contents)
if err != nil {
return
}
if _, err = contents.Write([]byte{uint8(pk.s2kType)}); err != nil {
return
}
optional := bytes.NewBuffer(nil)
if pk.Encrypted || pk.Dummy() {
optional.Write([]byte{uint8(pk.cipher)})
if err := pk.s2kParams.Serialize(optional); err != nil {
return err
}
if pk.Encrypted {
optional.Write(pk.iv)
}
}
if pk.Version == 5 {
contents.Write([]byte{uint8(optional.Len())})
}
io.Copy(contents, optional)
if !pk.Dummy() {
l := 0
var priv []byte
if !pk.Encrypted {
buf := bytes.NewBuffer(nil)
err = pk.serializePrivateKey(buf)
if err != nil {
return err
}
l = buf.Len()
if pk.sha1Checksum {
h := sha1.New()
h.Write(buf.Bytes())
buf.Write(h.Sum(nil))
} else {
checksum := mod64kHash(buf.Bytes())
buf.Write([]byte{byte(checksum >> 8), byte(checksum)})
}
priv = buf.Bytes()
} else {
priv, l = pk.encryptedData, len(pk.encryptedData)
}
if pk.Version == 5 {
contents.Write([]byte{byte(l >> 24), byte(l >> 16), byte(l >> 8), byte(l)})
}
contents.Write(priv)
}
ptype := packetTypePrivateKey
if pk.IsSubkey {
ptype = packetTypePrivateSubkey
}
err = serializeHeader(w, ptype, contents.Len())
if err != nil {
return
}
_, err = io.Copy(w, contents)
if err != nil {
return
}
return
}
func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error {
if _, err := w.Write(new(encoding.MPI).SetBig(priv.D).EncodedBytes()); err != nil {
return err
}
if _, err := w.Write(new(encoding.MPI).SetBig(priv.Primes[1]).EncodedBytes()); err != nil {
return err
}
if _, err := w.Write(new(encoding.MPI).SetBig(priv.Primes[0]).EncodedBytes()); err != nil {
return err
}
_, err := w.Write(new(encoding.MPI).SetBig(priv.Precomputed.Qinv).EncodedBytes())
return err
}
func serializeDSAPrivateKey(w io.Writer, priv *dsa.PrivateKey) error {
_, err := w.Write(new(encoding.MPI).SetBig(priv.X).EncodedBytes())
return err
}
func serializeElGamalPrivateKey(w io.Writer, priv *elgamal.PrivateKey) error {
_, err := w.Write(new(encoding.MPI).SetBig(priv.X).EncodedBytes())
return err
}
func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error {
_, err := w.Write(new(encoding.MPI).SetBig(priv.D).EncodedBytes())
return err
}
func serializeEdDSAPrivateKey(w io.Writer, priv *ed25519.PrivateKey) error {
keySize := ed25519.PrivateKeySize - ed25519.PublicKeySize
_, err := w.Write(encoding.NewMPI((*priv)[:keySize]).EncodedBytes())
return err
}
func serializeECDHPrivateKey(w io.Writer, priv *ecdh.PrivateKey) error {
_, err := w.Write(encoding.NewMPI(priv.D).EncodedBytes())
return err
}
// Decrypt decrypts an encrypted private key using a passphrase.
func (pk *PrivateKey) Decrypt(passphrase []byte) error {
if pk.Dummy() {
return errors.ErrDummyPrivateKey("dummy key found")
}
if !pk.Encrypted {
return nil
}
key := make([]byte, pk.cipher.KeySize())
pk.s2k(key, passphrase)
block := pk.cipher.new(key)
cfb := cipher.NewCFBDecrypter(block, pk.iv)
data := make([]byte, len(pk.encryptedData))
cfb.XORKeyStream(data, pk.encryptedData)
if pk.sha1Checksum {
if len(data) < sha1.Size {
return errors.StructuralError("truncated private key data")
}
h := sha1.New()
h.Write(data[:len(data)-sha1.Size])
sum := h.Sum(nil)
if !bytes.Equal(sum, data[len(data)-sha1.Size:]) {
return errors.StructuralError("private key checksum failure")
}
data = data[:len(data)-sha1.Size]
} else {
if len(data) < 2 {
return errors.StructuralError("truncated private key data")
}
var sum uint16
for i := 0; i < len(data)-2; i++ {
sum += uint16(data[i])
}
if data[len(data)-2] != uint8(sum>>8) ||
data[len(data)-1] != uint8(sum) {
return errors.StructuralError("private key checksum failure")
}
data = data[:len(data)-2]
}
err := pk.parsePrivateKey(data)
if _, ok := err.(errors.KeyInvalidError); ok {
return errors.KeyInvalidError("invalid key parameters")
}
if err != nil {
return err
}
// Mark key as unencrypted
pk.s2kType = S2KNON
pk.s2k = nil
pk.Encrypted = false
pk.encryptedData = nil
return nil
}
// Encrypt encrypts an unencrypted private key using a passphrase.
func (pk *PrivateKey) Encrypt(passphrase []byte) error {
priv := bytes.NewBuffer(nil)
err := pk.serializePrivateKey(priv)
if err != nil {
return err
}
//Default config of private key encryption
pk.cipher = CipherAES256
s2kConfig := &s2k.Config{
S2KMode: 3, //Iterated
S2KCount: 65536,
Hash: crypto.SHA256,
}
pk.s2kParams, err = s2k.Generate(rand.Reader, s2kConfig)
if err != nil {
return err
}
privateKeyBytes := priv.Bytes()
key := make([]byte, pk.cipher.KeySize())
pk.sha1Checksum = true
pk.s2k, err = pk.s2kParams.Function()
if err != nil {
return err
}
pk.s2k(key, passphrase)
block := pk.cipher.new(key)
pk.iv = make([]byte, pk.cipher.blockSize())
_, err = rand.Read(pk.iv)
if err != nil {
return err
}
cfb := cipher.NewCFBEncrypter(block, pk.iv)
if pk.sha1Checksum {
pk.s2kType = S2KSHA1
h := sha1.New()
h.Write(privateKeyBytes)
sum := h.Sum(nil)
privateKeyBytes = append(privateKeyBytes, sum...)
} else {
pk.s2kType = S2KCHECKSUM
var sum uint16
for _, b := range privateKeyBytes {
sum += uint16(b)
}
priv.Write([]byte{uint8(sum >> 8), uint8(sum)})
}
pk.encryptedData = make([]byte, len(privateKeyBytes))
cfb.XORKeyStream(pk.encryptedData, privateKeyBytes)
pk.Encrypted = true
pk.PrivateKey = nil
return err
}
func (pk *PrivateKey) serializePrivateKey(w io.Writer) (err error) {
switch priv := pk.PrivateKey.(type) {
case *rsa.PrivateKey:
err = serializeRSAPrivateKey(w, priv)
case *dsa.PrivateKey:
err = serializeDSAPrivateKey(w, priv)
case *elgamal.PrivateKey:
err = serializeElGamalPrivateKey(w, priv)
case *ecdsa.PrivateKey:
err = serializeECDSAPrivateKey(w, priv)
case *ed25519.PrivateKey:
err = serializeEdDSAPrivateKey(w, priv)
case *ecdh.PrivateKey:
err = serializeECDHPrivateKey(w, priv)
default:
err = errors.InvalidArgumentError("unknown private key type")
}
return
}
func (pk *PrivateKey) parsePrivateKey(data []byte) (err error) {
switch pk.PublicKey.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoRSAEncryptOnly:
return pk.parseRSAPrivateKey(data)
case PubKeyAlgoDSA:
return pk.parseDSAPrivateKey(data)
case PubKeyAlgoElGamal:
return pk.parseElGamalPrivateKey(data)
case PubKeyAlgoECDSA:
return pk.parseECDSAPrivateKey(data)
case PubKeyAlgoECDH:
return pk.parseECDHPrivateKey(data)
case PubKeyAlgoEdDSA:
return pk.parseEdDSAPrivateKey(data)
}
panic("impossible")
}
func (pk *PrivateKey) parseRSAPrivateKey(data []byte) (err error) {
rsaPub := pk.PublicKey.PublicKey.(*rsa.PublicKey)
rsaPriv := new(rsa.PrivateKey)
rsaPriv.PublicKey = *rsaPub
buf := bytes.NewBuffer(data)
d := new(encoding.MPI)
if _, err := d.ReadFrom(buf); err != nil {
return err
}
p := new(encoding.MPI)
if _, err := p.ReadFrom(buf); err != nil {
return err
}
q := new(encoding.MPI)
if _, err := q.ReadFrom(buf); err != nil {
return err
}
rsaPriv.D = new(big.Int).SetBytes(d.Bytes())
rsaPriv.Primes = make([]*big.Int, 2)
rsaPriv.Primes[0] = new(big.Int).SetBytes(p.Bytes())
rsaPriv.Primes[1] = new(big.Int).SetBytes(q.Bytes())
if err := rsaPriv.Validate(); err != nil {
return errors.KeyInvalidError(err.Error())
}
rsaPriv.Precompute()
pk.PrivateKey = rsaPriv
return nil
}
func (pk *PrivateKey) parseDSAPrivateKey(data []byte) (err error) {
dsaPub := pk.PublicKey.PublicKey.(*dsa.PublicKey)
dsaPriv := new(dsa.PrivateKey)
dsaPriv.PublicKey = *dsaPub
buf := bytes.NewBuffer(data)
x := new(encoding.MPI)
if _, err := x.ReadFrom(buf); err != nil {
return err
}
dsaPriv.X = new(big.Int).SetBytes(x.Bytes())
if err := validateDSAParameters(dsaPriv); err != nil {
return err
}
pk.PrivateKey = dsaPriv
return nil
}
func (pk *PrivateKey) parseElGamalPrivateKey(data []byte) (err error) {
pub := pk.PublicKey.PublicKey.(*elgamal.PublicKey)
priv := new(elgamal.PrivateKey)
priv.PublicKey = *pub
buf := bytes.NewBuffer(data)
x := new(encoding.MPI)
if _, err := x.ReadFrom(buf); err != nil {
return err
}
priv.X = new(big.Int).SetBytes(x.Bytes())
if err := validateElGamalParameters(priv); err != nil {
return err
}
pk.PrivateKey = priv
return nil
}
func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
ecdsaPriv := new(ecdsa.PrivateKey)
ecdsaPriv.PublicKey = *ecdsaPub
buf := bytes.NewBuffer(data)
d := new(encoding.MPI)
if _, err := d.ReadFrom(buf); err != nil {
return err
}
ecdsaPriv.D = new(big.Int).SetBytes(d.Bytes())
if err := validateECDSAParameters(ecdsaPriv); err != nil {
return err
}
pk.PrivateKey = ecdsaPriv
return nil
}
func (pk *PrivateKey) parseECDHPrivateKey(data []byte) (err error) {
ecdhPub := pk.PublicKey.PublicKey.(*ecdh.PublicKey)
ecdhPriv := new(ecdh.PrivateKey)
ecdhPriv.PublicKey = *ecdhPub
buf := bytes.NewBuffer(data)
d := new(encoding.MPI)
if _, err := d.ReadFrom(buf); err != nil {
return err
}
ecdhPriv.D = d.Bytes()
if err := validateECDHParameters(ecdhPriv); err != nil {
return err
}
pk.PrivateKey = ecdhPriv
return nil
}
func (pk *PrivateKey) parseEdDSAPrivateKey(data []byte) (err error) {
eddsaPub := pk.PublicKey.PublicKey.(*ed25519.PublicKey)
eddsaPriv := make(ed25519.PrivateKey, ed25519.PrivateKeySize)
buf := bytes.NewBuffer(data)
d := new(encoding.MPI)
if _, err := d.ReadFrom(buf); err != nil {
return err
}
priv := d.Bytes()
copy(eddsaPriv[32-len(priv):32], priv)
copy(eddsaPriv[32:], (*eddsaPub)[:])
if err := validateEdDSAParameters(&eddsaPriv); err != nil {
return err
}
pk.PrivateKey = &eddsaPriv
return nil
}
func validateECDSAParameters(priv *ecdsa.PrivateKey) error {
return validateCommonECC(priv.Curve, priv.D.Bytes(), priv.X, priv.Y)
}
func validateECDHParameters(priv *ecdh.PrivateKey) error {
if priv.CurveType != ecc.Curve25519 {
return validateCommonECC(priv.Curve, priv.D, priv.X, priv.Y)
}
// Handle Curve25519
Q := priv.X.Bytes()[1:]
var d [32]byte
// Copy reversed d
l := len(priv.D)
for i := 0; i < l; i++ {
d[i] = priv.D[l-i-1]
}
var expectedQ [32]byte
curve25519.ScalarBaseMult(&expectedQ, &d)
if !bytes.Equal(Q, expectedQ[:]) {
return errors.KeyInvalidError("ECDH curve25519: invalid point")
}
return nil
}
func validateCommonECC(curve elliptic.Curve, d []byte, X, Y *big.Int) error {
// the public point should not be at infinity (0,0)
zero := new(big.Int)
if X.Cmp(zero) == 0 && Y.Cmp(zero) == 0 {
return errors.KeyInvalidError(fmt.Sprintf("ecc (%s): infinity point", curve.Params().Name))
}
// re-derive the public point Q' = (X,Y) = dG
// to compare to declared Q in public key
expectedX, expectedY := curve.ScalarBaseMult(d)
if X.Cmp(expectedX) != 0 || Y.Cmp(expectedY) != 0 {
return errors.KeyInvalidError(fmt.Sprintf("ecc (%s): invalid point", curve.Params().Name))
}
return nil
}
func validateEdDSAParameters(priv *ed25519.PrivateKey) error {
// In EdDSA, the serialized public point is stored as part of private key (together with the seed),
// hence we can re-derive the key from the seed
seed := priv.Seed()
expectedPriv := ed25519.NewKeyFromSeed(seed)
if !bytes.Equal(*priv, expectedPriv) {
return errors.KeyInvalidError("eddsa: invalid point")
}
return nil
}
func validateDSAParameters(priv *dsa.PrivateKey) error {
p := priv.P // group prime
q := priv.Q // subgroup order
g := priv.G // g has order q mod p
x := priv.X // secret
y := priv.Y // y == g**x mod p
one := big.NewInt(1)
// expect g, y >= 2 and g < p
if g.Cmp(one) <= 0 || y.Cmp(one) <= 0 || g.Cmp(p) > 0 {
return errors.KeyInvalidError("dsa: invalid group")
}
// expect p > q
if p.Cmp(q) <= 0 {
return errors.KeyInvalidError("dsa: invalid group prime")
}
// q should be large enough and divide p-1
pSub1 := new(big.Int).Sub(p, one)
if q.BitLen() < 150 || new(big.Int).Mod(pSub1, q).Cmp(big.NewInt(0)) != 0 {
return errors.KeyInvalidError("dsa: invalid order")
}
// confirm that g has order q mod p
if !q.ProbablyPrime(32) || new(big.Int).Exp(g, q, p).Cmp(one) != 0 {
return errors.KeyInvalidError("dsa: invalid order")
}
// check y
if new(big.Int).Exp(g, x, p).Cmp(y) != 0 {
return errors.KeyInvalidError("dsa: mismatching values")
}
return nil
}
func validateElGamalParameters(priv *elgamal.PrivateKey) error {
p := priv.P // group prime
g := priv.G // g has order p-1 mod p
x := priv.X // secret
y := priv.Y // y == g**x mod p
one := big.NewInt(1)
// Expect g, y >= 2 and g < p
if g.Cmp(one) <= 0 || y.Cmp(one) <= 0 || g.Cmp(p) > 0 {
return errors.KeyInvalidError("elgamal: invalid group")
}
if p.BitLen() < 1024 {
return errors.KeyInvalidError("elgamal: group order too small")
}
pSub1 := new(big.Int).Sub(p, one)
if new(big.Int).Exp(g, pSub1, p).Cmp(one) != 0 {
return errors.KeyInvalidError("elgamal: invalid group")
}
// Since p-1 is not prime, g might have a smaller order that divides p-1.
// We cannot confirm the exact order of g, but we make sure it is not too small.
gExpI := new(big.Int).Set(g)
i := 1
threshold := 2 << 17 // we want order > threshold
for i < threshold {
i++ // we check every order to make sure key validation is not easily bypassed by guessing y'
gExpI.Mod(new(big.Int).Mul(gExpI, g), p)
if gExpI.Cmp(one) == 0 {
return errors.KeyInvalidError("elgamal: order too small")
}
}
// Check y
if new(big.Int).Exp(g, x, p).Cmp(y) != 0 {
return errors.KeyInvalidError("elgamal: mismatching values")
}
return nil
}

12
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/private_key_test_data.go generated vendored Normal file
View file

@ -0,0 +1,12 @@
package packet
// Generated with `gpg --export-secret-keys "Test Key 2"`
const privKeyRSAHex = "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"
// Generated by `gpg --export-secret-keys` followed by a manual extraction of
// the ElGamal subkey from the packets.
const privKeyElGamalHex = "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"
// pkcs1PrivKeyHex is a PKCS#1, RSA private key.
// Generated by `openssl genrsa 1024 | openssl rsa -outform DER | xxd -p`
const pkcs1PrivKeyHex = "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"

825
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/public_key.go generated vendored Normal file
View file

@ -0,0 +1,825 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"crypto"
"crypto/dsa"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
_ "crypto/sha512"
"encoding/binary"
"fmt"
"hash"
"io"
"math/big"
"strconv"
"time"
"github.com/ProtonMail/go-crypto/openpgp/ecdh"
"github.com/ProtonMail/go-crypto/openpgp/elgamal"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
"golang.org/x/crypto/ed25519"
)
type kdfHashFunction byte
type kdfAlgorithm byte
// PublicKey represents an OpenPGP public key. See RFC 4880, section 5.5.2.
type PublicKey struct {
Version int
CreationTime time.Time
PubKeyAlgo PublicKeyAlgorithm
PublicKey interface{} // *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey or *eddsa.PublicKey
Fingerprint []byte
KeyId uint64
IsSubkey bool
// RFC 4880 fields
n, e, p, q, g, y encoding.Field
// RFC 6637 fields
// oid contains the OID byte sequence identifying the elliptic curve used
oid encoding.Field
// kdf stores key derivation function parameters
// used for ECDH encryption. See RFC 6637, Section 9.
kdf encoding.Field
}
// UpgradeToV5 updates the version of the key to v5, and updates all necessary
// fields.
func (pk *PublicKey) UpgradeToV5() {
pk.Version = 5
pk.setFingerprintAndKeyId()
}
// signingKey provides a convenient abstraction over signature verification
// for v3 and v4 public keys.
type signingKey interface {
SerializeForHash(io.Writer) error
SerializeSignaturePrefix(io.Writer)
serializeWithoutHeaders(io.Writer) error
}
// NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey.
func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey) *PublicKey {
pk := &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoRSA,
PublicKey: pub,
n: new(encoding.MPI).SetBig(pub.N),
e: new(encoding.MPI).SetBig(big.NewInt(int64(pub.E))),
}
pk.setFingerprintAndKeyId()
return pk
}
// NewDSAPublicKey returns a PublicKey that wraps the given dsa.PublicKey.
func NewDSAPublicKey(creationTime time.Time, pub *dsa.PublicKey) *PublicKey {
pk := &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoDSA,
PublicKey: pub,
p: new(encoding.MPI).SetBig(pub.P),
q: new(encoding.MPI).SetBig(pub.Q),
g: new(encoding.MPI).SetBig(pub.G),
y: new(encoding.MPI).SetBig(pub.Y),
}
pk.setFingerprintAndKeyId()
return pk
}
// NewElGamalPublicKey returns a PublicKey that wraps the given elgamal.PublicKey.
func NewElGamalPublicKey(creationTime time.Time, pub *elgamal.PublicKey) *PublicKey {
pk := &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoElGamal,
PublicKey: pub,
p: new(encoding.MPI).SetBig(pub.P),
g: new(encoding.MPI).SetBig(pub.G),
y: new(encoding.MPI).SetBig(pub.Y),
}
pk.setFingerprintAndKeyId()
return pk
}
func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey {
pk := &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoECDSA,
PublicKey: pub,
p: encoding.NewMPI(elliptic.Marshal(pub.Curve, pub.X, pub.Y)),
}
curveInfo := ecc.FindByCurve(pub.Curve)
if curveInfo == nil {
panic("unknown elliptic curve")
}
pk.oid = curveInfo.Oid
pk.setFingerprintAndKeyId()
return pk
}
func NewECDHPublicKey(creationTime time.Time, pub *ecdh.PublicKey) *PublicKey {
var pk *PublicKey
var curveInfo *ecc.CurveInfo
var kdf = encoding.NewOID([]byte{0x1, pub.Hash.Id(), pub.Cipher.Id()})
if pub.CurveType == ecc.Curve25519 {
pk = &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoECDH,
PublicKey: pub,
p: encoding.NewMPI(pub.X.Bytes()),
kdf: kdf,
}
curveInfo = ecc.FindByName("Curve25519")
} else {
pk = &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoECDH,
PublicKey: pub,
p: encoding.NewMPI(elliptic.Marshal(pub.Curve, pub.X, pub.Y)),
kdf: kdf,
}
curveInfo = ecc.FindByCurve(pub.Curve)
}
if curveInfo == nil {
panic("unknown elliptic curve")
}
pk.oid = curveInfo.Oid
pk.setFingerprintAndKeyId()
return pk
}
func NewEdDSAPublicKey(creationTime time.Time, pub *ed25519.PublicKey) *PublicKey {
curveInfo := ecc.FindByName("Ed25519")
pk := &PublicKey{
Version: 4,
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoEdDSA,
PublicKey: pub,
oid: curveInfo.Oid,
// Native point format, see draft-koch-eddsa-for-openpgp-04, Appendix B
p: encoding.NewMPI(append([]byte{0x40}, *pub...)),
}
pk.setFingerprintAndKeyId()
return pk
}
func (pk *PublicKey) parse(r io.Reader) (err error) {
// RFC 4880, section 5.5.2
var buf [6]byte
_, err = readFull(r, buf[:])
if err != nil {
return
}
if buf[0] != 4 && buf[0] != 5 {
return errors.UnsupportedError("public key version " + strconv.Itoa(int(buf[0])))
}
pk.Version = int(buf[0])
if pk.Version == 5 {
var n [4]byte
_, err = readFull(r, n[:])
if err != nil {
return
}
}
pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
pk.PubKeyAlgo = PublicKeyAlgorithm(buf[5])
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
err = pk.parseRSA(r)
case PubKeyAlgoDSA:
err = pk.parseDSA(r)
case PubKeyAlgoElGamal:
err = pk.parseElGamal(r)
case PubKeyAlgoECDSA:
err = pk.parseECDSA(r)
case PubKeyAlgoECDH:
err = pk.parseECDH(r)
case PubKeyAlgoEdDSA:
err = pk.parseEdDSA(r)
default:
err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
}
if err != nil {
return
}
pk.setFingerprintAndKeyId()
return
}
func (pk *PublicKey) setFingerprintAndKeyId() {
// RFC 4880, section 12.2
if pk.Version == 5 {
fingerprint := sha256.New()
pk.SerializeForHash(fingerprint)
pk.Fingerprint = make([]byte, 32)
copy(pk.Fingerprint, fingerprint.Sum(nil))
pk.KeyId = binary.BigEndian.Uint64(pk.Fingerprint[:8])
} else {
fingerprint := sha1.New()
pk.SerializeForHash(fingerprint)
pk.Fingerprint = make([]byte, 20)
copy(pk.Fingerprint, fingerprint.Sum(nil))
pk.KeyId = binary.BigEndian.Uint64(pk.Fingerprint[12:20])
}
}
// parseRSA parses RSA public key material from the given Reader. See RFC 4880,
// section 5.5.2.
func (pk *PublicKey) parseRSA(r io.Reader) (err error) {
pk.n = new(encoding.MPI)
if _, err = pk.n.ReadFrom(r); err != nil {
return
}
pk.e = new(encoding.MPI)
if _, err = pk.e.ReadFrom(r); err != nil {
return
}
if len(pk.e.Bytes()) > 3 {
err = errors.UnsupportedError("large public exponent")
return
}
rsa := &rsa.PublicKey{
N: new(big.Int).SetBytes(pk.n.Bytes()),
E: 0,
}
for i := 0; i < len(pk.e.Bytes()); i++ {
rsa.E <<= 8
rsa.E |= int(pk.e.Bytes()[i])
}
pk.PublicKey = rsa
return
}
// parseDSA parses DSA public key material from the given Reader. See RFC 4880,
// section 5.5.2.
func (pk *PublicKey) parseDSA(r io.Reader) (err error) {
pk.p = new(encoding.MPI)
if _, err = pk.p.ReadFrom(r); err != nil {
return
}
pk.q = new(encoding.MPI)
if _, err = pk.q.ReadFrom(r); err != nil {
return
}
pk.g = new(encoding.MPI)
if _, err = pk.g.ReadFrom(r); err != nil {
return
}
pk.y = new(encoding.MPI)
if _, err = pk.y.ReadFrom(r); err != nil {
return
}
dsa := new(dsa.PublicKey)
dsa.P = new(big.Int).SetBytes(pk.p.Bytes())
dsa.Q = new(big.Int).SetBytes(pk.q.Bytes())
dsa.G = new(big.Int).SetBytes(pk.g.Bytes())
dsa.Y = new(big.Int).SetBytes(pk.y.Bytes())
pk.PublicKey = dsa
return
}
// parseElGamal parses ElGamal public key material from the given Reader. See
// RFC 4880, section 5.5.2.
func (pk *PublicKey) parseElGamal(r io.Reader) (err error) {
pk.p = new(encoding.MPI)
if _, err = pk.p.ReadFrom(r); err != nil {
return
}
pk.g = new(encoding.MPI)
if _, err = pk.g.ReadFrom(r); err != nil {
return
}
pk.y = new(encoding.MPI)
if _, err = pk.y.ReadFrom(r); err != nil {
return
}
elgamal := new(elgamal.PublicKey)
elgamal.P = new(big.Int).SetBytes(pk.p.Bytes())
elgamal.G = new(big.Int).SetBytes(pk.g.Bytes())
elgamal.Y = new(big.Int).SetBytes(pk.y.Bytes())
pk.PublicKey = elgamal
return
}
// parseECDSA parses ECDSA public key material from the given Reader. See
// RFC 6637, Section 9.
func (pk *PublicKey) parseECDSA(r io.Reader) (err error) {
pk.oid = new(encoding.OID)
if _, err = pk.oid.ReadFrom(r); err != nil {
return
}
pk.p = new(encoding.MPI)
if _, err = pk.p.ReadFrom(r); err != nil {
return
}
var c elliptic.Curve
curveInfo := ecc.FindByOid(pk.oid)
if curveInfo == nil || curveInfo.SigAlgorithm != ecc.ECDSA {
return errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", pk.oid))
}
c = curveInfo.Curve
x, y := elliptic.Unmarshal(c, pk.p.Bytes())
if x == nil {
return errors.UnsupportedError("failed to parse EC point")
}
pk.PublicKey = &ecdsa.PublicKey{Curve: c, X: x, Y: y}
return
}
// parseECDH parses ECDH public key material from the given Reader. See
// RFC 6637, Section 9.
func (pk *PublicKey) parseECDH(r io.Reader) (err error) {
pk.oid = new(encoding.OID)
if _, err = pk.oid.ReadFrom(r); err != nil {
return
}
pk.p = new(encoding.MPI)
if _, err = pk.p.ReadFrom(r); err != nil {
return
}
pk.kdf = new(encoding.OID)
if _, err = pk.kdf.ReadFrom(r); err != nil {
return
}
curveInfo := ecc.FindByOid(pk.oid)
if curveInfo == nil {
return errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", pk.oid))
}
c := curveInfo.Curve
cType := curveInfo.CurveType
var x, y *big.Int
if cType == ecc.Curve25519 {
x = new(big.Int)
x.SetBytes(pk.p.Bytes())
} else {
x, y = elliptic.Unmarshal(c, pk.p.Bytes())
}
if x == nil {
return errors.UnsupportedError("failed to parse EC point")
}
if kdfLen := len(pk.kdf.Bytes()); kdfLen < 3 {
return errors.UnsupportedError("unsupported ECDH KDF length: " + strconv.Itoa(kdfLen))
}
if reserved := pk.kdf.Bytes()[0]; reserved != 0x01 {
return errors.UnsupportedError("unsupported KDF reserved field: " + strconv.Itoa(int(reserved)))
}
kdfHash, ok := algorithm.HashById[pk.kdf.Bytes()[1]]
if !ok {
return errors.UnsupportedError("unsupported ECDH KDF hash: " + strconv.Itoa(int(pk.kdf.Bytes()[1])))
}
kdfCipher, ok := algorithm.CipherById[pk.kdf.Bytes()[2]]
if !ok {
return errors.UnsupportedError("unsupported ECDH KDF cipher: " + strconv.Itoa(int(pk.kdf.Bytes()[2])))
}
pk.PublicKey = &ecdh.PublicKey{
CurveType: cType,
Curve: c,
X: x,
Y: y,
KDF: ecdh.KDF{
Hash: kdfHash,
Cipher: kdfCipher,
},
}
return
}
func (pk *PublicKey) parseEdDSA(r io.Reader) (err error) {
pk.oid = new(encoding.OID)
if _, err = pk.oid.ReadFrom(r); err != nil {
return
}
curveInfo := ecc.FindByOid(pk.oid)
if curveInfo == nil || curveInfo.SigAlgorithm != ecc.EdDSA {
return errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", pk.oid))
}
pk.p = new(encoding.MPI)
if _, err = pk.p.ReadFrom(r); err != nil {
return
}
eddsa := make(ed25519.PublicKey, ed25519.PublicKeySize)
switch flag := pk.p.Bytes()[0]; flag {
case 0x04:
// TODO: see _grcy_ecc_eddsa_ensure_compact in grcypt
return errors.UnsupportedError("unsupported EdDSA compression: " + strconv.Itoa(int(flag)))
case 0x40:
copy(eddsa[:], pk.p.Bytes()[1:])
default:
return errors.UnsupportedError("unsupported EdDSA compression: " + strconv.Itoa(int(flag)))
}
pk.PublicKey = &eddsa
return
}
// SerializeForHash serializes the PublicKey to w with the special packet
// header format needed for hashing.
func (pk *PublicKey) SerializeForHash(w io.Writer) error {
pk.SerializeSignaturePrefix(w)
return pk.serializeWithoutHeaders(w)
}
// SerializeSignaturePrefix writes the prefix for this public key to the given Writer.
// The prefix is used when calculating a signature over this public key. See
// RFC 4880, section 5.2.4.
func (pk *PublicKey) SerializeSignaturePrefix(w io.Writer) {
var pLength = pk.algorithmSpecificByteCount()
if pk.Version == 5 {
pLength += 10 // version, timestamp (4), algorithm, key octet count (4).
w.Write([]byte{
0x9A,
byte(pLength >> 24),
byte(pLength >> 16),
byte(pLength >> 8),
byte(pLength),
})
return
}
pLength += 6
w.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)})
}
func (pk *PublicKey) Serialize(w io.Writer) (err error) {
length := 6 // 6 byte header
length += pk.algorithmSpecificByteCount()
if pk.Version == 5 {
length += 4 // octet key count
}
packetType := packetTypePublicKey
if pk.IsSubkey {
packetType = packetTypePublicSubkey
}
err = serializeHeader(w, packetType, length)
if err != nil {
return
}
return pk.serializeWithoutHeaders(w)
}
func (pk *PublicKey) algorithmSpecificByteCount() int {
length := 0
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
length += int(pk.n.EncodedLength())
length += int(pk.e.EncodedLength())
case PubKeyAlgoDSA:
length += int(pk.p.EncodedLength())
length += int(pk.q.EncodedLength())
length += int(pk.g.EncodedLength())
length += int(pk.y.EncodedLength())
case PubKeyAlgoElGamal:
length += int(pk.p.EncodedLength())
length += int(pk.g.EncodedLength())
length += int(pk.y.EncodedLength())
case PubKeyAlgoECDSA:
length += int(pk.oid.EncodedLength())
length += int(pk.p.EncodedLength())
case PubKeyAlgoECDH:
length += int(pk.oid.EncodedLength())
length += int(pk.p.EncodedLength())
length += int(pk.kdf.EncodedLength())
case PubKeyAlgoEdDSA:
length += int(pk.oid.EncodedLength())
length += int(pk.p.EncodedLength())
default:
panic("unknown public key algorithm")
}
return length
}
// serializeWithoutHeaders marshals the PublicKey to w in the form of an
// OpenPGP public key packet, not including the packet header.
func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) {
t := uint32(pk.CreationTime.Unix())
if _, err = w.Write([]byte{
byte(pk.Version),
byte(t >> 24), byte(t >> 16), byte(t >> 8), byte(t),
byte(pk.PubKeyAlgo),
}); err != nil {
return
}
if pk.Version == 5 {
n := pk.algorithmSpecificByteCount()
if _, err = w.Write([]byte{
byte(n >> 24), byte(n >> 16), byte(n >> 8), byte(n),
}); err != nil {
return
}
}
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
if _, err = w.Write(pk.n.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.e.EncodedBytes())
return
case PubKeyAlgoDSA:
if _, err = w.Write(pk.p.EncodedBytes()); err != nil {
return
}
if _, err = w.Write(pk.q.EncodedBytes()); err != nil {
return
}
if _, err = w.Write(pk.g.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.y.EncodedBytes())
return
case PubKeyAlgoElGamal:
if _, err = w.Write(pk.p.EncodedBytes()); err != nil {
return
}
if _, err = w.Write(pk.g.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.y.EncodedBytes())
return
case PubKeyAlgoECDSA:
if _, err = w.Write(pk.oid.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.p.EncodedBytes())
return
case PubKeyAlgoECDH:
if _, err = w.Write(pk.oid.EncodedBytes()); err != nil {
return
}
if _, err = w.Write(pk.p.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.kdf.EncodedBytes())
return
case PubKeyAlgoEdDSA:
if _, err = w.Write(pk.oid.EncodedBytes()); err != nil {
return
}
_, err = w.Write(pk.p.EncodedBytes())
return
}
return errors.InvalidArgumentError("bad public-key algorithm")
}
// CanSign returns true iff this public key can generate signatures
func (pk *PublicKey) CanSign() bool {
return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly && pk.PubKeyAlgo != PubKeyAlgoElGamal && pk.PubKeyAlgo != PubKeyAlgoECDH
}
// VerifySignature returns nil iff sig is a valid signature, made by this
// public key, of the data hashed into signed. signed is mutated by this call.
func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err error) {
if !pk.CanSign() {
return errors.InvalidArgumentError("public key cannot generate signatures")
}
if sig.Version == 5 && (sig.SigType == 0x00 || sig.SigType == 0x01) {
sig.AddMetadataToHashSuffix()
}
signed.Write(sig.HashSuffix)
hashBytes := signed.Sum(nil)
if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
return errors.SignatureError("hash tag doesn't match")
}
if pk.PubKeyAlgo != sig.PubKeyAlgo {
return errors.InvalidArgumentError("public key and signature use different algorithms")
}
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
rsaPublicKey, _ := pk.PublicKey.(*rsa.PublicKey)
err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, padToKeySize(rsaPublicKey, sig.RSASignature.Bytes()))
if err != nil {
return errors.SignatureError("RSA verification failure")
}
return nil
case PubKeyAlgoDSA:
dsaPublicKey, _ := pk.PublicKey.(*dsa.PublicKey)
// Need to truncate hashBytes to match FIPS 186-3 section 4.6.
subgroupSize := (dsaPublicKey.Q.BitLen() + 7) / 8
if len(hashBytes) > subgroupSize {
hashBytes = hashBytes[:subgroupSize]
}
if !dsa.Verify(dsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.DSASigR.Bytes()), new(big.Int).SetBytes(sig.DSASigS.Bytes())) {
return errors.SignatureError("DSA verification failure")
}
return nil
case PubKeyAlgoECDSA:
ecdsaPublicKey := pk.PublicKey.(*ecdsa.PublicKey)
if !ecdsa.Verify(ecdsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.ECDSASigR.Bytes()), new(big.Int).SetBytes(sig.ECDSASigS.Bytes())) {
return errors.SignatureError("ECDSA verification failure")
}
return nil
case PubKeyAlgoEdDSA:
eddsaPublicKey := pk.PublicKey.(*ed25519.PublicKey)
sigR := sig.EdDSASigR.Bytes()
sigS := sig.EdDSASigS.Bytes()
eddsaSig := make([]byte, ed25519.SignatureSize)
copy(eddsaSig[32-len(sigR):32], sigR)
copy(eddsaSig[64-len(sigS):], sigS)
if !ed25519.Verify(*eddsaPublicKey, hashBytes, eddsaSig) {
return errors.SignatureError("EdDSA verification failure")
}
return nil
default:
return errors.SignatureError("Unsupported public key algorithm used in signature")
}
}
// keySignatureHash returns a Hash of the message that needs to be signed for
// pk to assert a subkey relationship to signed.
func keySignatureHash(pk, signed signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
if !hashFunc.Available() {
return nil, errors.UnsupportedError("hash function")
}
h = hashFunc.New()
// RFC 4880, section 5.2.4
err = pk.SerializeForHash(h)
if err != nil {
return nil, err
}
err = signed.SerializeForHash(h)
return
}
// VerifyKeySignature returns nil iff sig is a valid signature, made by this
// public key, of signed.
func (pk *PublicKey) VerifyKeySignature(signed *PublicKey, sig *Signature) error {
h, err := keySignatureHash(pk, signed, sig.Hash)
if err != nil {
return err
}
if err = pk.VerifySignature(h, sig); err != nil {
return err
}
if sig.FlagSign {
// Signing subkeys must be cross-signed. See
// https://www.gnupg.org/faq/subkey-cross-certify.html.
if sig.EmbeddedSignature == nil {
return errors.StructuralError("signing subkey is missing cross-signature")
}
// Verify the cross-signature. This is calculated over the same
// data as the main signature, so we cannot just recursively
// call signed.VerifyKeySignature(...)
if h, err = keySignatureHash(pk, signed, sig.EmbeddedSignature.Hash); err != nil {
return errors.StructuralError("error while hashing for cross-signature: " + err.Error())
}
if err := signed.VerifySignature(h, sig.EmbeddedSignature); err != nil {
return errors.StructuralError("error while verifying cross-signature: " + err.Error())
}
}
return nil
}
func keyRevocationHash(pk signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
if !hashFunc.Available() {
return nil, errors.UnsupportedError("hash function")
}
h = hashFunc.New()
// RFC 4880, section 5.2.4
err = pk.SerializeForHash(h)
return
}
// VerifyRevocationSignature returns nil iff sig is a valid signature, made by this
// public key.
func (pk *PublicKey) VerifyRevocationSignature(sig *Signature) (err error) {
h, err := keyRevocationHash(pk, sig.Hash)
if err != nil {
return err
}
return pk.VerifySignature(h, sig)
}
// VerifySubkeyRevocationSignature returns nil iff sig is a valid subkey revocation signature,
// made by the passed in signingKey.
func (pk *PublicKey) VerifySubkeyRevocationSignature(sig *Signature, signingKey *PublicKey) (err error) {
h, err := keyRevocationHash(pk, sig.Hash)
if err != nil {
return err
}
return signingKey.VerifySignature(h, sig)
}
// userIdSignatureHash returns a Hash of the message that needs to be signed
// to assert that pk is a valid key for id.
func userIdSignatureHash(id string, pk *PublicKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
if !hashFunc.Available() {
return nil, errors.UnsupportedError("hash function")
}
h = hashFunc.New()
// RFC 4880, section 5.2.4
pk.SerializeSignaturePrefix(h)
pk.serializeWithoutHeaders(h)
var buf [5]byte
buf[0] = 0xb4
buf[1] = byte(len(id) >> 24)
buf[2] = byte(len(id) >> 16)
buf[3] = byte(len(id) >> 8)
buf[4] = byte(len(id))
h.Write(buf[:])
h.Write([]byte(id))
return
}
// VerifyUserIdSignature returns nil iff sig is a valid signature, made by this
// public key, that id is the identity of pub.
func (pk *PublicKey) VerifyUserIdSignature(id string, pub *PublicKey, sig *Signature) (err error) {
h, err := userIdSignatureHash(id, pub, sig.Hash)
if err != nil {
return err
}
return pk.VerifySignature(h, sig)
}
// KeyIdString returns the public key's fingerprint in capital hex
// (e.g. "6C7EE1B8621CC013").
func (pk *PublicKey) KeyIdString() string {
return fmt.Sprintf("%X", pk.Fingerprint[12:20])
}
// KeyIdShortString returns the short form of public key's fingerprint
// in capital hex, as shown by gpg --list-keys (e.g. "621CC013").
func (pk *PublicKey) KeyIdShortString() string {
return fmt.Sprintf("%X", pk.Fingerprint[16:20])
}
// BitLength returns the bit length for the given public key.
func (pk *PublicKey) BitLength() (bitLength uint16, err error) {
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
bitLength = pk.n.BitLength()
case PubKeyAlgoDSA:
bitLength = pk.p.BitLength()
case PubKeyAlgoElGamal:
bitLength = pk.p.BitLength()
case PubKeyAlgoECDSA:
bitLength = pk.p.BitLength()
case PubKeyAlgoECDH:
bitLength = pk.p.BitLength()
case PubKeyAlgoEdDSA:
bitLength = pk.p.BitLength()
default:
err = errors.InvalidArgumentError("bad public-key algorithm")
}
return
}
// KeyExpired returns whether sig is a self-signature of a key that has
// expired or is created in the future.
func (pk *PublicKey) KeyExpired(sig *Signature, currentTime time.Time) bool {
if pk.CreationTime.After(currentTime) {
return true
}
if sig.KeyLifetimeSecs == nil || *sig.KeyLifetimeSecs == 0 {
return false
}
expiry := pk.CreationTime.Add(time.Duration(*sig.KeyLifetimeSecs) * time.Second)
return currentTime.After(expiry)
}

24
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/public_key_test_data.go generated vendored Normal file
View file

@ -0,0 +1,24 @@
package packet
const rsaFingerprintHex = "5fb74b1d03b1e3cb31bc2f8aa34d7e18c20c31bb"
const rsaPkDataHex = "988d044d3c5c10010400b1d13382944bd5aba23a4312968b5095d14f947f600eb478e14a6fcb16b0e0cac764884909c020bc495cfcc39a935387c661507bdb236a0612fb582cac3af9b29cc2c8c70090616c41b662f4da4c1201e195472eb7f4ae1ccbcbf9940fe21d985e379a5563dde5b9a23d35f1cfaa5790da3b79db26f23695107bfaca8e7b5bcd0011010001"
const dsaFingerprintHex = "eece4c094db002103714c63c8e8fbe54062f19ed"
const dsaPkDataHex = "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"
const ecdsaFingerprintHex = "9892270b38b8980b05c8d56d43fe956c542ca00b"
const ecdsaPkDataHex = "9893045071c29413052b8104002304230401f4867769cedfa52c325018896245443968e52e51d0c2df8d939949cb5b330f2921711fbee1c9b9dddb95d15cb0255e99badeddda7cc23d9ddcaacbc290969b9f24019375d61c2e4e3b36953a28d8b2bc95f78c3f1d592fb24499be348656a7b17e3963187b4361afe497bc5f9f81213f04069f8e1fb9e6a6290ae295ca1a92b894396cb4"
const ecdhFingerprintHex = "722354df2475a42164d1d49faa8b938f9a201946"
const ecdhPkDataHex = "b90073044d53059212052b810400220303042faa84024a20b6735c4897efa5bfb41bf85b7eefeab5ca0cb9ffc8ea04a46acb25534a577694f9e25340a4ab5223a9dd1eda530c8aa2e6718db10d7e672558c7736fe09369ea5739a2a3554bf16d41faa50562f11c6d39bbd5dffb6b9a9ec91803010909"
const eddsaFingerprintHex = "b2d5e5ec0e6deca6bc8eeeb00907e75e1dd99ad8"
const eddsaPkDataHex = "98330456e2132b16092b06010401da470f01010740bbda39266affa511a8c2d02edf690fb784b0499c4406185811a163539ef11dc1b41d74657374696e67203c74657374696e674074657374696e672e636f6d3e8879041316080021050256e2132b021b03050b09080702061508090a0b020416020301021e01021780000a09100907e75e1dd99ad86d0c00fe39d2008359352782bc9b61ac382584cd8eff3f57a18c2287e3afeeb05d1f04ba00fe2d0bc1ddf3ff8adb9afa3e7d9287244b4ec567f3db4d60b74a9b5465ed528203"
// Source: https://sites.google.com/site/brainhub/pgpecckeys#TOC-ECC-NIST-P-384-key
const ecc384PubHex = `99006f044d53059213052b81040022030304f6b8c5aced5b84ef9f4a209db2e4a9dfb70d28cb8c10ecd57674a9fa5a67389942b62d5e51367df4c7bfd3f8e500feecf07ed265a621a8ebbbe53e947ec78c677eba143bd1533c2b350e1c29f82313e1e1108eba063be1e64b10e6950e799c2db42465635f6473615f64685f333834203c6f70656e70677040627261696e6875622e6f72673e8900cb04101309005305024d530592301480000000002000077072656665727265642d656d61696c2d656e636f64696e67407067702e636f6d7067706d696d65040b090807021901051b03000000021602051e010000000415090a08000a0910098033880f54719fca2b0180aa37350968bd5f115afd8ce7bc7b103822152dbff06d0afcda835329510905b98cb469ba208faab87c7412b799e7b633017f58364ea480e8a1a3f253a0c5f22c446e8be9a9fce6210136ee30811abbd49139de28b5bdf8dc36d06ae748579e9ff503b90073044d53059212052b810400220303042faa84024a20b6735c4897efa5bfb41bf85b7eefeab5ca0cb9ffc8ea04a46acb25534a577694f9e25340a4ab5223a9dd1eda530c8aa2e6718db10d7e672558c7736fe09369ea5739a2a3554bf16d41faa50562f11c6d39bbd5dffb6b9a9ec9180301090989008404181309000c05024d530592051b0c000000000a0910098033880f54719f80970180eee7a6d8fcee41ee4f9289df17f9bcf9d955dca25c583b94336f3a2b2d4986dc5cf417b8d2dc86f741a9e1a6d236c0e3017d1c76575458a0cfb93ae8a2b274fcc65ceecd7a91eec83656ba13219969f06945b48c56bd04152c3a0553c5f2f4bd1267`

78
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/reader.go generated vendored Normal file
View file

@ -0,0 +1,78 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"io"
"github.com/ProtonMail/go-crypto/openpgp/errors"
)
// Reader reads packets from an io.Reader and allows packets to be 'unread' so
// that they result from the next call to Next.
type Reader struct {
q []Packet
readers []io.Reader
}
// New io.Readers are pushed when a compressed or encrypted packet is processed
// and recursively treated as a new source of packets. However, a carefully
// crafted packet can trigger an infinite recursive sequence of packets. See
// http://mumble.net/~campbell/misc/pgp-quine
// https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4402
// This constant limits the number of recursive packets that may be pushed.
const maxReaders = 32
// Next returns the most recently unread Packet, or reads another packet from
// the top-most io.Reader. Unknown packet types are skipped.
func (r *Reader) Next() (p Packet, err error) {
if len(r.q) > 0 {
p = r.q[len(r.q)-1]
r.q = r.q[:len(r.q)-1]
return
}
for len(r.readers) > 0 {
p, err = Read(r.readers[len(r.readers)-1])
if err == nil {
return
}
if err == io.EOF {
r.readers = r.readers[:len(r.readers)-1]
continue
}
// TODO: Add strict mode that rejects unknown packets, instead of ignoring them.
if _, ok := err.(errors.UnknownPacketTypeError); !ok {
return nil, err
}
}
return nil, io.EOF
}
// Push causes the Reader to start reading from a new io.Reader. When an EOF
// error is seen from the new io.Reader, it is popped and the Reader continues
// to read from the next most recent io.Reader. Push returns a StructuralError
// if pushing the reader would exceed the maximum recursion level, otherwise it
// returns nil.
func (r *Reader) Push(reader io.Reader) (err error) {
if len(r.readers) >= maxReaders {
return errors.StructuralError("too many layers of packets")
}
r.readers = append(r.readers, reader)
return nil
}
// Unread causes the given Packet to be returned from the next call to Next.
func (r *Reader) Unread(p Packet) {
r.q = append(r.q, p)
}
func NewReader(r io.Reader) *Reader {
return &Reader{
q: nil,
readers: []io.Reader{r},
}
}

964
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/signature.go generated vendored Normal file
View file

@ -0,0 +1,964 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"bytes"
"crypto"
"crypto/dsa"
"crypto/ecdsa"
"encoding/asn1"
"encoding/binary"
"hash"
"io"
"math/big"
"strconv"
"time"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
"github.com/ProtonMail/go-crypto/openpgp/s2k"
)
const (
// See RFC 4880, section 5.2.3.21 for details.
KeyFlagCertify = 1 << iota
KeyFlagSign
KeyFlagEncryptCommunications
KeyFlagEncryptStorage
)
// Signature represents a signature. See RFC 4880, section 5.2.
type Signature struct {
Version int
SigType SignatureType
PubKeyAlgo PublicKeyAlgorithm
Hash crypto.Hash
// HashSuffix is extra data that is hashed in after the signed data.
HashSuffix []byte
// HashTag contains the first two bytes of the hash for fast rejection
// of bad signed data.
HashTag [2]byte
// Metadata includes format, filename and time, and is protected by v5
// signatures of type 0x00 or 0x01. This metadata is included into the hash
// computation; if nil, six 0x00 bytes are used instead. See section 5.2.4.
Metadata *LiteralData
CreationTime time.Time
RSASignature encoding.Field
DSASigR, DSASigS encoding.Field
ECDSASigR, ECDSASigS encoding.Field
EdDSASigR, EdDSASigS encoding.Field
// rawSubpackets contains the unparsed subpackets, in order.
rawSubpackets []outputSubpacket
// The following are optional so are nil when not included in the
// signature.
SigLifetimeSecs, KeyLifetimeSecs *uint32
PreferredSymmetric, PreferredHash, PreferredCompression []uint8
PreferredAEAD []uint8
IssuerKeyId *uint64
IssuerFingerprint []byte
IsPrimaryId *bool
// FlagsValid is set if any flags were given. See RFC 4880, section
// 5.2.3.21 for details.
FlagsValid bool
FlagCertify, FlagSign, FlagEncryptCommunications, FlagEncryptStorage bool
// RevocationReason is set if this signature has been revoked.
// See RFC 4880, section 5.2.3.23 for details.
RevocationReason *uint8
RevocationReasonText string
// In a self-signature, these flags are set there is a features subpacket
// indicating that the issuer implementation supports these features
// (section 5.2.5.25).
MDC, AEAD, V5Keys bool
// EmbeddedSignature, if non-nil, is a signature of the parent key, by
// this key. This prevents an attacker from claiming another's signing
// subkey as their own.
EmbeddedSignature *Signature
outSubpackets []outputSubpacket
}
func (sig *Signature) parse(r io.Reader) (err error) {
// RFC 4880, section 5.2.3
var buf [5]byte
_, err = readFull(r, buf[:1])
if err != nil {
return
}
if buf[0] != 4 && buf[0] != 5 {
err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0])))
return
}
sig.Version = int(buf[0])
_, err = readFull(r, buf[:5])
if err != nil {
return
}
sig.SigType = SignatureType(buf[0])
sig.PubKeyAlgo = PublicKeyAlgorithm(buf[1])
switch sig.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA, PubKeyAlgoEdDSA:
default:
err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
return
}
var ok bool
sig.Hash, ok = s2k.HashIdToHash(buf[2])
if !ok {
return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2])))
}
hashedSubpacketsLength := int(buf[3])<<8 | int(buf[4])
hashedSubpackets := make([]byte, hashedSubpacketsLength)
_, err = readFull(r, hashedSubpackets)
if err != nil {
return
}
sig.buildHashSuffix(hashedSubpackets)
err = parseSignatureSubpackets(sig, hashedSubpackets, true)
if err != nil {
return
}
_, err = readFull(r, buf[:2])
if err != nil {
return
}
unhashedSubpacketsLength := int(buf[0])<<8 | int(buf[1])
unhashedSubpackets := make([]byte, unhashedSubpacketsLength)
_, err = readFull(r, unhashedSubpackets)
if err != nil {
return
}
err = parseSignatureSubpackets(sig, unhashedSubpackets, false)
if err != nil {
return
}
_, err = readFull(r, sig.HashTag[:2])
if err != nil {
return
}
switch sig.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
sig.RSASignature = new(encoding.MPI)
_, err = sig.RSASignature.ReadFrom(r)
case PubKeyAlgoDSA:
sig.DSASigR = new(encoding.MPI)
if _, err = sig.DSASigR.ReadFrom(r); err != nil {
return
}
sig.DSASigS = new(encoding.MPI)
_, err = sig.DSASigS.ReadFrom(r)
case PubKeyAlgoECDSA:
sig.ECDSASigR = new(encoding.MPI)
if _, err = sig.ECDSASigR.ReadFrom(r); err != nil {
return
}
sig.ECDSASigS = new(encoding.MPI)
_, err = sig.ECDSASigS.ReadFrom(r)
case PubKeyAlgoEdDSA:
sig.EdDSASigR = new(encoding.MPI)
if _, err = sig.EdDSASigR.ReadFrom(r); err != nil {
return
}
sig.EdDSASigS = new(encoding.MPI)
if _, err = sig.EdDSASigS.ReadFrom(r); err != nil {
return
}
default:
panic("unreachable")
}
return
}
// parseSignatureSubpackets parses subpackets of the main signature packet. See
// RFC 4880, section 5.2.3.1.
func parseSignatureSubpackets(sig *Signature, subpackets []byte, isHashed bool) (err error) {
for len(subpackets) > 0 {
subpackets, err = parseSignatureSubpacket(sig, subpackets, isHashed)
if err != nil {
return
}
}
if sig.CreationTime.IsZero() {
err = errors.StructuralError("no creation time in signature")
}
return
}
type signatureSubpacketType uint8
const (
creationTimeSubpacket signatureSubpacketType = 2
signatureExpirationSubpacket signatureSubpacketType = 3
keyExpirationSubpacket signatureSubpacketType = 9
prefSymmetricAlgosSubpacket signatureSubpacketType = 11
issuerSubpacket signatureSubpacketType = 16
prefHashAlgosSubpacket signatureSubpacketType = 21
prefCompressionSubpacket signatureSubpacketType = 22
primaryUserIdSubpacket signatureSubpacketType = 25
keyFlagsSubpacket signatureSubpacketType = 27
reasonForRevocationSubpacket signatureSubpacketType = 29
featuresSubpacket signatureSubpacketType = 30
embeddedSignatureSubpacket signatureSubpacketType = 32
issuerFingerprintSubpacket signatureSubpacketType = 33
prefAeadAlgosSubpacket signatureSubpacketType = 34
)
// parseSignatureSubpacket parses a single subpacket. len(subpacket) is >= 1.
func parseSignatureSubpacket(sig *Signature, subpacket []byte, isHashed bool) (rest []byte, err error) {
// RFC 4880, section 5.2.3.1
var (
length uint32
packetType signatureSubpacketType
isCritical bool
)
switch {
case subpacket[0] < 192:
length = uint32(subpacket[0])
subpacket = subpacket[1:]
case subpacket[0] < 255:
if len(subpacket) < 2 {
goto Truncated
}
length = uint32(subpacket[0]-192)<<8 + uint32(subpacket[1]) + 192
subpacket = subpacket[2:]
default:
if len(subpacket) < 5 {
goto Truncated
}
length = uint32(subpacket[1])<<24 |
uint32(subpacket[2])<<16 |
uint32(subpacket[3])<<8 |
uint32(subpacket[4])
subpacket = subpacket[5:]
}
if length > uint32(len(subpacket)) {
goto Truncated
}
rest = subpacket[length:]
subpacket = subpacket[:length]
if len(subpacket) == 0 {
err = errors.StructuralError("zero length signature subpacket")
return
}
packetType = signatureSubpacketType(subpacket[0] & 0x7f)
isCritical = subpacket[0]&0x80 == 0x80
subpacket = subpacket[1:]
sig.rawSubpackets = append(sig.rawSubpackets, outputSubpacket{isHashed, packetType, isCritical, subpacket})
switch packetType {
case creationTimeSubpacket:
if !isHashed {
err = errors.StructuralError("signature creation time in non-hashed area")
return
}
if len(subpacket) != 4 {
err = errors.StructuralError("signature creation time not four bytes")
return
}
t := binary.BigEndian.Uint32(subpacket)
sig.CreationTime = time.Unix(int64(t), 0)
case signatureExpirationSubpacket:
// Signature expiration time, section 5.2.3.10
if !isHashed {
return
}
if len(subpacket) != 4 {
err = errors.StructuralError("expiration subpacket with bad length")
return
}
sig.SigLifetimeSecs = new(uint32)
*sig.SigLifetimeSecs = binary.BigEndian.Uint32(subpacket)
case keyExpirationSubpacket:
// Key expiration time, section 5.2.3.6
if !isHashed {
return
}
if len(subpacket) != 4 {
err = errors.StructuralError("key expiration subpacket with bad length")
return
}
sig.KeyLifetimeSecs = new(uint32)
*sig.KeyLifetimeSecs = binary.BigEndian.Uint32(subpacket)
case prefSymmetricAlgosSubpacket:
// Preferred symmetric algorithms, section 5.2.3.7
if !isHashed {
return
}
sig.PreferredSymmetric = make([]byte, len(subpacket))
copy(sig.PreferredSymmetric, subpacket)
case issuerSubpacket:
if sig.Version > 4 {
err = errors.StructuralError("issuer subpacket found in v5 key")
}
// Issuer, section 5.2.3.5
if len(subpacket) != 8 {
err = errors.StructuralError("issuer subpacket with bad length")
return
}
sig.IssuerKeyId = new(uint64)
*sig.IssuerKeyId = binary.BigEndian.Uint64(subpacket)
case prefHashAlgosSubpacket:
// Preferred hash algorithms, section 5.2.3.8
if !isHashed {
return
}
sig.PreferredHash = make([]byte, len(subpacket))
copy(sig.PreferredHash, subpacket)
case prefCompressionSubpacket:
// Preferred compression algorithms, section 5.2.3.9
if !isHashed {
return
}
sig.PreferredCompression = make([]byte, len(subpacket))
copy(sig.PreferredCompression, subpacket)
case primaryUserIdSubpacket:
// Primary User ID, section 5.2.3.19
if !isHashed {
return
}
if len(subpacket) != 1 {
err = errors.StructuralError("primary user id subpacket with bad length")
return
}
sig.IsPrimaryId = new(bool)
if subpacket[0] > 0 {
*sig.IsPrimaryId = true
}
case keyFlagsSubpacket:
// Key flags, section 5.2.3.21
if !isHashed {
return
}
if len(subpacket) == 0 {
err = errors.StructuralError("empty key flags subpacket")
return
}
sig.FlagsValid = true
if subpacket[0]&KeyFlagCertify != 0 {
sig.FlagCertify = true
}
if subpacket[0]&KeyFlagSign != 0 {
sig.FlagSign = true
}
if subpacket[0]&KeyFlagEncryptCommunications != 0 {
sig.FlagEncryptCommunications = true
}
if subpacket[0]&KeyFlagEncryptStorage != 0 {
sig.FlagEncryptStorage = true
}
case reasonForRevocationSubpacket:
// Reason For Revocation, section 5.2.3.23
if !isHashed {
return
}
if len(subpacket) == 0 {
err = errors.StructuralError("empty revocation reason subpacket")
return
}
sig.RevocationReason = new(uint8)
*sig.RevocationReason = subpacket[0]
sig.RevocationReasonText = string(subpacket[1:])
case featuresSubpacket:
// Features subpacket, section 5.2.3.24 specifies a very general
// mechanism for OpenPGP implementations to signal support for new
// features.
if !isHashed {
return
}
if len(subpacket) > 0 {
if subpacket[0]&0x01 != 0 {
sig.MDC = true
}
if subpacket[0]&0x02 != 0 {
sig.AEAD = true
}
if subpacket[0]&0x04 != 0 {
sig.V5Keys = true
}
}
case embeddedSignatureSubpacket:
// Only usage is in signatures that cross-certify
// signing subkeys. section 5.2.3.26 describes the
// format, with its usage described in section 11.1
if sig.EmbeddedSignature != nil {
err = errors.StructuralError("Cannot have multiple embedded signatures")
return
}
sig.EmbeddedSignature = new(Signature)
// Embedded signatures are required to be v4 signatures see
// section 12.1. However, we only parse v4 signatures in this
// file anyway.
if err := sig.EmbeddedSignature.parse(bytes.NewBuffer(subpacket)); err != nil {
return nil, err
}
if sigType := sig.EmbeddedSignature.SigType; sigType != SigTypePrimaryKeyBinding {
return nil, errors.StructuralError("cross-signature has unexpected type " + strconv.Itoa(int(sigType)))
}
case issuerFingerprintSubpacket:
v, l := subpacket[0], len(subpacket[1:])
if v == 5 && l != 32 || v != 5 && l != 20 {
return nil, errors.StructuralError("bad fingerprint length")
}
sig.IssuerFingerprint = make([]byte, l)
copy(sig.IssuerFingerprint, subpacket[1:])
sig.IssuerKeyId = new(uint64)
if v == 5 {
*sig.IssuerKeyId = binary.BigEndian.Uint64(subpacket[1:9])
} else {
*sig.IssuerKeyId = binary.BigEndian.Uint64(subpacket[13:21])
}
case prefAeadAlgosSubpacket:
// Preferred symmetric algorithms, section 5.2.3.8
if !isHashed {
return
}
sig.PreferredAEAD = make([]byte, len(subpacket))
copy(sig.PreferredAEAD, subpacket)
default:
if isCritical {
err = errors.UnsupportedError("unknown critical signature subpacket type " + strconv.Itoa(int(packetType)))
return
}
}
return
Truncated:
err = errors.StructuralError("signature subpacket truncated")
return
}
// subpacketLengthLength returns the length, in bytes, of an encoded length value.
func subpacketLengthLength(length int) int {
if length < 192 {
return 1
}
if length < 16320 {
return 2
}
return 5
}
func (sig *Signature) CheckKeyIdOrFingerprint(pk *PublicKey) bool {
if sig.IssuerFingerprint != nil && len(sig.IssuerFingerprint) >= 20 {
return bytes.Equal(sig.IssuerFingerprint, pk.Fingerprint)
}
return sig.IssuerKeyId != nil && *sig.IssuerKeyId == pk.KeyId
}
// serializeSubpacketLength marshals the given length into to.
func serializeSubpacketLength(to []byte, length int) int {
// RFC 4880, Section 4.2.2.
if length < 192 {
to[0] = byte(length)
return 1
}
if length < 16320 {
length -= 192
to[0] = byte((length >> 8) + 192)
to[1] = byte(length)
return 2
}
to[0] = 255
to[1] = byte(length >> 24)
to[2] = byte(length >> 16)
to[3] = byte(length >> 8)
to[4] = byte(length)
return 5
}
// subpacketsLength returns the serialized length, in bytes, of the given
// subpackets.
func subpacketsLength(subpackets []outputSubpacket, hashed bool) (length int) {
for _, subpacket := range subpackets {
if subpacket.hashed == hashed {
length += subpacketLengthLength(len(subpacket.contents) + 1)
length += 1 // type byte
length += len(subpacket.contents)
}
}
return
}
// serializeSubpackets marshals the given subpackets into to.
func serializeSubpackets(to []byte, subpackets []outputSubpacket, hashed bool) {
for _, subpacket := range subpackets {
if subpacket.hashed == hashed {
n := serializeSubpacketLength(to, len(subpacket.contents)+1)
to[n] = byte(subpacket.subpacketType)
to = to[1+n:]
n = copy(to, subpacket.contents)
to = to[n:]
}
}
return
}
// SigExpired returns whether sig is a signature that has expired or is created
// in the future.
func (sig *Signature) SigExpired(currentTime time.Time) bool {
if sig.CreationTime.After(currentTime) {
return true
}
if sig.SigLifetimeSecs == nil || *sig.SigLifetimeSecs == 0 {
return false
}
expiry := sig.CreationTime.Add(time.Duration(*sig.SigLifetimeSecs) * time.Second)
return currentTime.After(expiry)
}
// buildHashSuffix constructs the HashSuffix member of sig in preparation for signing.
func (sig *Signature) buildHashSuffix(hashedSubpackets []byte) (err error) {
hash, ok := s2k.HashToHashId(sig.Hash)
if !ok {
sig.HashSuffix = nil
return errors.InvalidArgumentError("hash cannot be represented in OpenPGP: " + strconv.Itoa(int(sig.Hash)))
}
hashedFields := bytes.NewBuffer([]byte{
uint8(sig.Version),
uint8(sig.SigType),
uint8(sig.PubKeyAlgo),
uint8(hash),
uint8(len(hashedSubpackets) >> 8),
uint8(len(hashedSubpackets)),
})
hashedFields.Write(hashedSubpackets)
var l uint64 = uint64(6 + len(hashedSubpackets))
if sig.Version == 5 {
hashedFields.Write([]byte{0x05, 0xff})
hashedFields.Write([]byte{
uint8(l >> 56), uint8(l >> 48), uint8(l >> 40), uint8(l >> 32),
uint8(l >> 24), uint8(l >> 16), uint8(l >> 8), uint8(l),
})
} else {
hashedFields.Write([]byte{0x04, 0xff})
hashedFields.Write([]byte{
uint8(l >> 24), uint8(l >> 16), uint8(l >> 8), uint8(l),
})
}
sig.HashSuffix = make([]byte, hashedFields.Len())
copy(sig.HashSuffix, hashedFields.Bytes())
return
}
func (sig *Signature) signPrepareHash(h hash.Hash) (digest []byte, err error) {
hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true)
hashedSubpackets := make([]byte, hashedSubpacketsLen)
serializeSubpackets(hashedSubpackets, sig.outSubpackets, true)
err = sig.buildHashSuffix(hashedSubpackets)
if err != nil {
return
}
if sig.Version == 5 && (sig.SigType == 0x00 || sig.SigType == 0x01) {
sig.AddMetadataToHashSuffix()
}
h.Write(sig.HashSuffix)
digest = h.Sum(nil)
copy(sig.HashTag[:], digest)
return
}
// Sign signs a message with a private key. The hash, h, must contain
// the hash of the message to be signed and will be mutated by this function.
// On success, the signature is stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err error) {
if priv.Dummy() {
return errors.ErrDummyPrivateKey("dummy key found")
}
sig.Version = priv.PublicKey.Version
sig.IssuerFingerprint = priv.PublicKey.Fingerprint
sig.outSubpackets, err = sig.buildSubpackets(priv.PublicKey)
if err != nil {
return err
}
digest, err := sig.signPrepareHash(h)
if err != nil {
return
}
switch priv.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
// supports both *rsa.PrivateKey and crypto.Signer
sigdata, err := priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash)
if err == nil {
sig.RSASignature = encoding.NewMPI(sigdata)
}
case PubKeyAlgoDSA:
dsaPriv := priv.PrivateKey.(*dsa.PrivateKey)
// Need to truncate hashBytes to match FIPS 186-3 section 4.6.
subgroupSize := (dsaPriv.Q.BitLen() + 7) / 8
if len(digest) > subgroupSize {
digest = digest[:subgroupSize]
}
r, s, err := dsa.Sign(config.Random(), dsaPriv, digest)
if err == nil {
sig.DSASigR = new(encoding.MPI).SetBig(r)
sig.DSASigS = new(encoding.MPI).SetBig(s)
}
case PubKeyAlgoECDSA:
var r, s *big.Int
if pk, ok := priv.PrivateKey.(*ecdsa.PrivateKey); ok {
// direct support, avoid asn1 wrapping/unwrapping
r, s, err = ecdsa.Sign(config.Random(), pk, digest)
} else {
var b []byte
b, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash)
if err == nil {
r, s, err = unwrapECDSASig(b)
}
}
if err == nil {
sig.ECDSASigR = new(encoding.MPI).SetBig(r)
sig.ECDSASigS = new(encoding.MPI).SetBig(s)
}
case PubKeyAlgoEdDSA:
sigdata, err := priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, crypto.Hash(0))
if err == nil {
sig.EdDSASigR = encoding.NewMPI(sigdata[:32])
sig.EdDSASigS = encoding.NewMPI(sigdata[32:])
}
default:
err = errors.UnsupportedError("public key algorithm: " + strconv.Itoa(int(sig.PubKeyAlgo)))
}
return
}
// unwrapECDSASig parses the two integer components of an ASN.1-encoded ECDSA
// signature.
func unwrapECDSASig(b []byte) (r, s *big.Int, err error) {
var ecsdaSig struct {
R, S *big.Int
}
_, err = asn1.Unmarshal(b, &ecsdaSig)
if err != nil {
return
}
return ecsdaSig.R, ecsdaSig.S, nil
}
// SignUserId computes a signature from priv, asserting that pub is a valid
// key for the identity id. On success, the signature is stored in sig. Call
// Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) SignUserId(id string, pub *PublicKey, priv *PrivateKey, config *Config) error {
if priv.Dummy() {
return errors.ErrDummyPrivateKey("dummy key found")
}
h, err := userIdSignatureHash(id, pub, sig.Hash)
if err != nil {
return err
}
return sig.Sign(h, priv, config)
}
// CrossSignKey computes a signature from signingKey on pub hashed using hashKey. On success,
// the signature is stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) CrossSignKey(pub *PublicKey, hashKey *PublicKey, signingKey *PrivateKey,
config *Config) error {
h, err := keySignatureHash(hashKey, pub, sig.Hash)
if err != nil {
return err
}
return sig.Sign(h, signingKey, config)
}
// SignKey computes a signature from priv, asserting that pub is a subkey. On
// success, the signature is stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) SignKey(pub *PublicKey, priv *PrivateKey, config *Config) error {
if priv.Dummy() {
return errors.ErrDummyPrivateKey("dummy key found")
}
h, err := keySignatureHash(&priv.PublicKey, pub, sig.Hash)
if err != nil {
return err
}
return sig.Sign(h, priv, config)
}
// RevokeKey computes a revocation signature of pub using priv. On success, the signature is
// stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) RevokeKey(pub *PublicKey, priv *PrivateKey, config *Config) error {
h, err := keyRevocationHash(pub, sig.Hash)
if err != nil {
return err
}
return sig.Sign(h, priv, config)
}
// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
// called first.
func (sig *Signature) Serialize(w io.Writer) (err error) {
if len(sig.outSubpackets) == 0 {
sig.outSubpackets = sig.rawSubpackets
}
if sig.RSASignature == nil && sig.DSASigR == nil && sig.ECDSASigR == nil && sig.EdDSASigR == nil {
return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
}
sigLength := 0
switch sig.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
sigLength = int(sig.RSASignature.EncodedLength())
case PubKeyAlgoDSA:
sigLength = int(sig.DSASigR.EncodedLength())
sigLength += int(sig.DSASigS.EncodedLength())
case PubKeyAlgoECDSA:
sigLength = int(sig.ECDSASigR.EncodedLength())
sigLength += int(sig.ECDSASigS.EncodedLength())
case PubKeyAlgoEdDSA:
sigLength = int(sig.EdDSASigR.EncodedLength())
sigLength += int(sig.EdDSASigS.EncodedLength())
default:
panic("impossible")
}
unhashedSubpacketsLen := subpacketsLength(sig.outSubpackets, false)
length := len(sig.HashSuffix) - 6 /* trailer not included */ +
2 /* length of unhashed subpackets */ + unhashedSubpacketsLen +
2 /* hash tag */ + sigLength
if sig.Version == 5 {
length -= 4 // eight-octet instead of four-octet big endian
}
err = serializeHeader(w, packetTypeSignature, length)
if err != nil {
return
}
err = sig.serializeBody(w)
if err != nil {
return err
}
return
}
func (sig *Signature) serializeBody(w io.Writer) (err error) {
hashedSubpacketsLen := uint16(uint16(sig.HashSuffix[4])<<8) | uint16(sig.HashSuffix[5])
fields := sig.HashSuffix[:6+hashedSubpacketsLen]
_, err = w.Write(fields)
if err != nil {
return
}
unhashedSubpacketsLen := subpacketsLength(sig.outSubpackets, false)
unhashedSubpackets := make([]byte, 2+unhashedSubpacketsLen)
unhashedSubpackets[0] = byte(unhashedSubpacketsLen >> 8)
unhashedSubpackets[1] = byte(unhashedSubpacketsLen)
serializeSubpackets(unhashedSubpackets[2:], sig.outSubpackets, false)
_, err = w.Write(unhashedSubpackets)
if err != nil {
return
}
_, err = w.Write(sig.HashTag[:])
if err != nil {
return
}
switch sig.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
_, err = w.Write(sig.RSASignature.EncodedBytes())
case PubKeyAlgoDSA:
if _, err = w.Write(sig.DSASigR.EncodedBytes()); err != nil {
return
}
_, err = w.Write(sig.DSASigS.EncodedBytes())
case PubKeyAlgoECDSA:
if _, err = w.Write(sig.ECDSASigR.EncodedBytes()); err != nil {
return
}
_, err = w.Write(sig.ECDSASigS.EncodedBytes())
case PubKeyAlgoEdDSA:
if _, err = w.Write(sig.EdDSASigR.EncodedBytes()); err != nil {
return
}
_, err = w.Write(sig.EdDSASigS.EncodedBytes())
default:
panic("impossible")
}
return
}
// outputSubpacket represents a subpacket to be marshaled.
type outputSubpacket struct {
hashed bool // true if this subpacket is in the hashed area.
subpacketType signatureSubpacketType
isCritical bool
contents []byte
}
func (sig *Signature) buildSubpackets(issuer PublicKey) (subpackets []outputSubpacket, err error) {
creationTime := make([]byte, 4)
binary.BigEndian.PutUint32(creationTime, uint32(sig.CreationTime.Unix()))
subpackets = append(subpackets, outputSubpacket{true, creationTimeSubpacket, false, creationTime})
if sig.IssuerKeyId != nil && sig.Version == 4 {
keyId := make([]byte, 8)
binary.BigEndian.PutUint64(keyId, *sig.IssuerKeyId)
subpackets = append(subpackets, outputSubpacket{true, issuerSubpacket, true, keyId})
}
if sig.IssuerFingerprint != nil {
contents := append([]uint8{uint8(issuer.Version)}, sig.IssuerFingerprint...)
subpackets = append(subpackets, outputSubpacket{true, issuerFingerprintSubpacket, true, contents})
}
if sig.SigLifetimeSecs != nil && *sig.SigLifetimeSecs != 0 {
sigLifetime := make([]byte, 4)
binary.BigEndian.PutUint32(sigLifetime, *sig.SigLifetimeSecs)
subpackets = append(subpackets, outputSubpacket{true, signatureExpirationSubpacket, true, sigLifetime})
}
// Key flags may only appear in self-signatures or certification signatures.
if sig.FlagsValid {
var flags byte
if sig.FlagCertify {
flags |= KeyFlagCertify
}
if sig.FlagSign {
flags |= KeyFlagSign
}
if sig.FlagEncryptCommunications {
flags |= KeyFlagEncryptCommunications
}
if sig.FlagEncryptStorage {
flags |= KeyFlagEncryptStorage
}
subpackets = append(subpackets, outputSubpacket{true, keyFlagsSubpacket, false, []byte{flags}})
}
// The following subpackets may only appear in self-signatures.
var features = byte(0x00)
if sig.MDC {
features |= 0x01
}
if sig.AEAD {
features |= 0x02
}
if sig.V5Keys {
features |= 0x04
}
if features != 0x00 {
subpackets = append(subpackets, outputSubpacket{true, featuresSubpacket, false, []byte{features}})
}
if sig.KeyLifetimeSecs != nil && *sig.KeyLifetimeSecs != 0 {
keyLifetime := make([]byte, 4)
binary.BigEndian.PutUint32(keyLifetime, *sig.KeyLifetimeSecs)
subpackets = append(subpackets, outputSubpacket{true, keyExpirationSubpacket, true, keyLifetime})
}
if sig.IsPrimaryId != nil && *sig.IsPrimaryId {
subpackets = append(subpackets, outputSubpacket{true, primaryUserIdSubpacket, false, []byte{1}})
}
if len(sig.PreferredSymmetric) > 0 {
subpackets = append(subpackets, outputSubpacket{true, prefSymmetricAlgosSubpacket, false, sig.PreferredSymmetric})
}
if len(sig.PreferredHash) > 0 {
subpackets = append(subpackets, outputSubpacket{true, prefHashAlgosSubpacket, false, sig.PreferredHash})
}
if len(sig.PreferredCompression) > 0 {
subpackets = append(subpackets, outputSubpacket{true, prefCompressionSubpacket, false, sig.PreferredCompression})
}
if len(sig.PreferredAEAD) > 0 {
subpackets = append(subpackets, outputSubpacket{true, prefAeadAlgosSubpacket, false, sig.PreferredAEAD})
}
// Revocation reason appears only in revocation signatures and is serialized as per section 5.2.3.23.
if sig.RevocationReason != nil {
subpackets = append(subpackets, outputSubpacket{true, reasonForRevocationSubpacket, true,
append([]uint8{*sig.RevocationReason}, []uint8(sig.RevocationReasonText)...)})
}
// EmbeddedSignature appears only in subkeys capable of signing and is serialized as per section 5.2.3.26.
if sig.EmbeddedSignature != nil {
var buf bytes.Buffer
err = sig.EmbeddedSignature.serializeBody(&buf)
if err != nil {
return
}
subpackets = append(subpackets, outputSubpacket{true, embeddedSignatureSubpacket, true, buf.Bytes()})
}
return
}
// AddMetadataToHashSuffix modifies the current hash suffix to include metadata
// (format, filename, and time). Version 5 keys protect this data including it
// in the hash computation. See section 5.2.4.
func (sig *Signature) AddMetadataToHashSuffix() {
if sig == nil || sig.Version != 5 {
return
}
if sig.SigType != 0x00 && sig.SigType != 0x01 {
return
}
lit := sig.Metadata
if lit == nil {
// This will translate into six 0x00 bytes.
lit = &LiteralData{}
}
// Extract the current byte count
n := sig.HashSuffix[len(sig.HashSuffix)-8:]
l := uint64(
uint64(n[0])<<56 | uint64(n[1])<<48 | uint64(n[2])<<40 | uint64(n[3])<<32 |
uint64(n[4])<<24 | uint64(n[5])<<16 | uint64(n[6])<<8 | uint64(n[7]))
suffix := bytes.NewBuffer(nil)
suffix.Write(sig.HashSuffix[:l])
// Add the metadata
var buf [4]byte
buf[0] = lit.Format
fileName := lit.FileName
if len(lit.FileName) > 255 {
fileName = fileName[:255]
}
buf[1] = byte(len(fileName))
suffix.Write(buf[:2])
suffix.Write([]byte(lit.FileName))
binary.BigEndian.PutUint32(buf[:], lit.Time)
suffix.Write(buf[:])
// Update the counter and restore trailing bytes
l = uint64(suffix.Len())
suffix.Write([]byte{0x05, 0xff})
suffix.Write([]byte{
uint8(l >> 56), uint8(l >> 48), uint8(l >> 40), uint8(l >> 32),
uint8(l >> 24), uint8(l >> 16), uint8(l >> 8), uint8(l),
})
sig.HashSuffix = suffix.Bytes()
}

267
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetric_key_encrypted.go generated vendored Normal file
View file

@ -0,0 +1,267 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"bytes"
"crypto/cipher"
"io"
"strconv"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/s2k"
)
// This is the largest session key that we'll support. Since no 512-bit cipher
// has even been seriously used, this is comfortably large.
const maxSessionKeySizeInBytes = 64
// SymmetricKeyEncrypted represents a passphrase protected session key. See RFC
// 4880, section 5.3.
type SymmetricKeyEncrypted struct {
Version int
CipherFunc CipherFunction
Mode AEADMode
s2k func(out, in []byte)
aeadNonce []byte
encryptedKey []byte
}
func (ske *SymmetricKeyEncrypted) parse(r io.Reader) error {
// RFC 4880, section 5.3.
var buf [2]byte
if _, err := readFull(r, buf[:]); err != nil {
return err
}
ske.Version = int(buf[0])
if ske.Version != 4 && ske.Version != 5 {
return errors.UnsupportedError("unknown SymmetricKeyEncrypted version")
}
ske.CipherFunc = CipherFunction(buf[1])
if ske.CipherFunc.KeySize() == 0 {
return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(buf[1])))
}
if ske.Version == 5 {
mode := make([]byte, 1)
if _, err := r.Read(mode); err != nil {
return errors.StructuralError("cannot read AEAD octect from packet")
}
ske.Mode = AEADMode(mode[0])
}
var err error
if ske.s2k, err = s2k.Parse(r); err != nil {
if _, ok := err.(errors.ErrDummyPrivateKey); ok {
return errors.UnsupportedError("missing key GNU extension in session key")
}
return err
}
if ske.Version == 5 {
// AEAD nonce
nonce := make([]byte, ske.Mode.NonceLength())
_, err := readFull(r, nonce)
if err != nil && err != io.ErrUnexpectedEOF {
return err
}
ske.aeadNonce = nonce
}
encryptedKey := make([]byte, maxSessionKeySizeInBytes)
// The session key may follow. We just have to try and read to find
// out. If it exists then we limit it to maxSessionKeySizeInBytes.
n, err := readFull(r, encryptedKey)
if err != nil && err != io.ErrUnexpectedEOF {
return err
}
if n != 0 {
if n == maxSessionKeySizeInBytes {
return errors.UnsupportedError("oversized encrypted session key")
}
ske.encryptedKey = encryptedKey[:n]
}
return nil
}
// Decrypt attempts to decrypt an encrypted session key and returns the key and
// the cipher to use when decrypting a subsequent Symmetrically Encrypted Data
// packet.
func (ske *SymmetricKeyEncrypted) Decrypt(passphrase []byte) ([]byte, CipherFunction, error) {
key := make([]byte, ske.CipherFunc.KeySize())
ske.s2k(key, passphrase)
if len(ske.encryptedKey) == 0 {
return key, ske.CipherFunc, nil
}
switch ske.Version {
case 4:
plaintextKey, cipherFunc, err := ske.decryptV4(key)
return plaintextKey, cipherFunc, err
case 5:
plaintextKey, err := ske.decryptV5(key)
return plaintextKey, CipherFunction(0), err
}
err := errors.UnsupportedError("unknown SymmetricKeyEncrypted version")
return nil, CipherFunction(0), err
}
func (ske *SymmetricKeyEncrypted) decryptV4(key []byte) ([]byte, CipherFunction, error) {
// the IV is all zeros
iv := make([]byte, ske.CipherFunc.blockSize())
c := cipher.NewCFBDecrypter(ske.CipherFunc.new(key), iv)
plaintextKey := make([]byte, len(ske.encryptedKey))
c.XORKeyStream(plaintextKey, ske.encryptedKey)
cipherFunc := CipherFunction(plaintextKey[0])
if cipherFunc.blockSize() == 0 {
return nil, ske.CipherFunc, errors.UnsupportedError(
"unknown cipher: " + strconv.Itoa(int(cipherFunc)))
}
plaintextKey = plaintextKey[1:]
if len(plaintextKey) != cipherFunc.KeySize() {
return nil, cipherFunc, errors.StructuralError(
"length of decrypted key not equal to cipher keysize")
}
return plaintextKey, cipherFunc, nil
}
func (ske *SymmetricKeyEncrypted) decryptV5(key []byte) ([]byte, error) {
blockCipher := CipherFunction(ske.CipherFunc).new(key)
aead := ske.Mode.new(blockCipher)
adata := []byte{0xc3, byte(5), byte(ske.CipherFunc), byte(ske.Mode)}
plaintextKey, err := aead.Open(nil, ske.aeadNonce, ske.encryptedKey, adata)
if err != nil {
return nil, err
}
return plaintextKey, nil
}
// SerializeSymmetricKeyEncrypted serializes a symmetric key packet to w.
// The packet contains a random session key, encrypted by a key derived from
// the given passphrase. The session key is returned and must be passed to
// SerializeSymmetricallyEncrypted or SerializeAEADEncrypted, depending on
// whether config.AEADConfig != nil.
// If config is nil, sensible defaults will be used.
func SerializeSymmetricKeyEncrypted(w io.Writer, passphrase []byte, config *Config) (key []byte, err error) {
cipherFunc := config.Cipher()
keySize := cipherFunc.KeySize()
if keySize == 0 {
return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
}
sessionKey := make([]byte, keySize)
_, err = io.ReadFull(config.Random(), sessionKey)
if err != nil {
return
}
err = SerializeSymmetricKeyEncryptedReuseKey(w, sessionKey, passphrase, config)
if err != nil {
return
}
key = sessionKey
return
}
// SerializeSymmetricKeyEncryptedReuseKey serializes a symmetric key packet to w.
// The packet contains the given session key, encrypted by a key derived from
// the given passphrase. The session key must be passed to
// SerializeSymmetricallyEncrypted or SerializeAEADEncrypted, depending on
// whether config.AEADConfig != nil.
// If config is nil, sensible defaults will be used.
func SerializeSymmetricKeyEncryptedReuseKey(w io.Writer, sessionKey []byte, passphrase []byte, config *Config) (err error) {
var version int
if config.AEAD() != nil {
version = 5
} else {
version = 4
}
cipherFunc := config.Cipher()
keySize := cipherFunc.KeySize()
if keySize == 0 {
return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
}
s2kBuf := new(bytes.Buffer)
keyEncryptingKey := make([]byte, keySize)
// s2k.Serialize salts and stretches the passphrase, and writes the
// resulting key to keyEncryptingKey and the s2k descriptor to s2kBuf.
err = s2k.Serialize(s2kBuf, keyEncryptingKey, config.Random(), passphrase, &s2k.Config{Hash: config.Hash(), S2KCount: config.PasswordHashIterations()})
if err != nil {
return
}
s2kBytes := s2kBuf.Bytes()
var packetLength int
switch version {
case 4:
packetLength = 2 /* header */ + len(s2kBytes) + 1 /* cipher type */ + keySize
case 5:
nonceLen := config.AEAD().Mode().NonceLength()
tagLen := config.AEAD().Mode().TagLength()
packetLength = 3 + len(s2kBytes) + nonceLen + keySize + tagLen
}
err = serializeHeader(w, packetTypeSymmetricKeyEncrypted, packetLength)
if err != nil {
return
}
buf := make([]byte, 2)
// Symmetric Key Encrypted Version
buf[0] = byte(version)
// Cipher function
buf[1] = byte(cipherFunc)
if version == 5 {
// AEAD mode
buf = append(buf, byte(config.AEAD().Mode()))
}
_, err = w.Write(buf)
if err != nil {
return
}
_, err = w.Write(s2kBytes)
if err != nil {
return
}
switch version {
case 4:
iv := make([]byte, cipherFunc.blockSize())
c := cipher.NewCFBEncrypter(cipherFunc.new(keyEncryptingKey), iv)
encryptedCipherAndKey := make([]byte, keySize+1)
c.XORKeyStream(encryptedCipherAndKey, buf[1:])
c.XORKeyStream(encryptedCipherAndKey[1:], sessionKey)
_, err = w.Write(encryptedCipherAndKey)
if err != nil {
return
}
case 5:
blockCipher := cipherFunc.new(keyEncryptingKey)
mode := config.AEAD().Mode()
aead := mode.new(blockCipher)
// Sample nonce using random reader
nonce := make([]byte, config.AEAD().Mode().NonceLength())
_, err = io.ReadFull(config.Random(), nonce)
if err != nil {
return
}
// Seal and write (encryptedData includes auth. tag)
adata := []byte{0xc3, byte(5), byte(cipherFunc), byte(mode)}
encryptedData := aead.Seal(nil, nonce, sessionKey, adata)
_, err = w.Write(nonce)
if err != nil {
return
}
_, err = w.Write(encryptedData)
if err != nil {
return
}
}
return
}

290
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetrically_encrypted.go generated vendored Normal file
View file

@ -0,0 +1,290 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"crypto/cipher"
"crypto/sha1"
"crypto/subtle"
"hash"
"io"
"strconv"
"github.com/ProtonMail/go-crypto/openpgp/errors"
)
// SymmetricallyEncrypted represents a symmetrically encrypted byte string. The
// encrypted Contents will consist of more OpenPGP packets. See RFC 4880,
// sections 5.7 and 5.13.
type SymmetricallyEncrypted struct {
MDC bool // true iff this is a type 18 packet and thus has an embedded MAC.
Contents io.Reader
prefix []byte
}
const symmetricallyEncryptedVersion = 1
func (se *SymmetricallyEncrypted) parse(r io.Reader) error {
if se.MDC {
// See RFC 4880, section 5.13.
var buf [1]byte
_, err := readFull(r, buf[:])
if err != nil {
return err
}
if buf[0] != symmetricallyEncryptedVersion {
return errors.UnsupportedError("unknown SymmetricallyEncrypted version")
}
}
se.Contents = r
return nil
}
// Decrypt returns a ReadCloser, from which the decrypted Contents of the
// packet can be read. An incorrect key will only be detected after trying
// to decrypt the entire data.
func (se *SymmetricallyEncrypted) Decrypt(c CipherFunction, key []byte) (io.ReadCloser, error) {
keySize := c.KeySize()
if keySize == 0 {
return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(c)))
}
if len(key) != keySize {
return nil, errors.InvalidArgumentError("SymmetricallyEncrypted: incorrect key length")
}
if se.prefix == nil {
se.prefix = make([]byte, c.blockSize()+2)
_, err := readFull(se.Contents, se.prefix)
if err != nil {
return nil, err
}
} else if len(se.prefix) != c.blockSize()+2 {
return nil, errors.InvalidArgumentError("can't try ciphers with different block lengths")
}
ocfbResync := OCFBResync
if se.MDC {
// MDC packets use a different form of OCFB mode.
ocfbResync = OCFBNoResync
}
s := NewOCFBDecrypter(c.new(key), se.prefix, ocfbResync)
plaintext := cipher.StreamReader{S: s, R: se.Contents}
if se.MDC {
// MDC packets have an embedded hash that we need to check.
h := sha1.New()
h.Write(se.prefix)
return &seMDCReader{in: plaintext, h: h}, nil
}
// Otherwise, we just need to wrap plaintext so that it's a valid ReadCloser.
return seReader{plaintext}, nil
}
// seReader wraps an io.Reader with a no-op Close method.
type seReader struct {
in io.Reader
}
func (ser seReader) Read(buf []byte) (int, error) {
return ser.in.Read(buf)
}
func (ser seReader) Close() error {
return nil
}
const mdcTrailerSize = 1 /* tag byte */ + 1 /* length byte */ + sha1.Size
// An seMDCReader wraps an io.Reader, maintains a running hash and keeps hold
// of the most recent 22 bytes (mdcTrailerSize). Upon EOF, those bytes form an
// MDC packet containing a hash of the previous Contents which is checked
// against the running hash. See RFC 4880, section 5.13.
type seMDCReader struct {
in io.Reader
h hash.Hash
trailer [mdcTrailerSize]byte
scratch [mdcTrailerSize]byte
trailerUsed int
error bool
eof bool
}
func (ser *seMDCReader) Read(buf []byte) (n int, err error) {
if ser.error {
err = io.ErrUnexpectedEOF
return
}
if ser.eof {
err = io.EOF
return
}
// If we haven't yet filled the trailer buffer then we must do that
// first.
for ser.trailerUsed < mdcTrailerSize {
n, err = ser.in.Read(ser.trailer[ser.trailerUsed:])
ser.trailerUsed += n
if err == io.EOF {
if ser.trailerUsed != mdcTrailerSize {
n = 0
err = io.ErrUnexpectedEOF
ser.error = true
return
}
ser.eof = true
n = 0
return
}
if err != nil {
n = 0
return
}
}
// If it's a short read then we read into a temporary buffer and shift
// the data into the caller's buffer.
if len(buf) <= mdcTrailerSize {
n, err = readFull(ser.in, ser.scratch[:len(buf)])
copy(buf, ser.trailer[:n])
ser.h.Write(buf[:n])
copy(ser.trailer[:], ser.trailer[n:])
copy(ser.trailer[mdcTrailerSize-n:], ser.scratch[:])
if n < len(buf) {
ser.eof = true
err = io.EOF
}
return
}
n, err = ser.in.Read(buf[mdcTrailerSize:])
copy(buf, ser.trailer[:])
ser.h.Write(buf[:n])
copy(ser.trailer[:], buf[n:])
if err == io.EOF {
ser.eof = true
}
return
}
// This is a new-format packet tag byte for a type 19 (MDC) packet.
const mdcPacketTagByte = byte(0x80) | 0x40 | 19
func (ser *seMDCReader) Close() error {
if ser.error {
return errors.ErrMDCMissing
}
for !ser.eof {
// We haven't seen EOF so we need to read to the end
var buf [1024]byte
_, err := ser.Read(buf[:])
if err == io.EOF {
break
}
if err != nil {
return errors.ErrMDCMissing
}
}
ser.h.Write(ser.trailer[:2])
final := ser.h.Sum(nil)
if subtle.ConstantTimeCompare(final, ser.trailer[2:]) != 1 {
return errors.ErrMDCHashMismatch
}
// The hash already includes the MDC header, but we still check its value
// to confirm encryption correctness
if ser.trailer[0] != mdcPacketTagByte || ser.trailer[1] != sha1.Size {
return errors.ErrMDCMissing
}
return nil
}
// An seMDCWriter writes through to an io.WriteCloser while maintains a running
// hash of the data written. On close, it emits an MDC packet containing the
// running hash.
type seMDCWriter struct {
w io.WriteCloser
h hash.Hash
}
func (w *seMDCWriter) Write(buf []byte) (n int, err error) {
w.h.Write(buf)
return w.w.Write(buf)
}
func (w *seMDCWriter) Close() (err error) {
var buf [mdcTrailerSize]byte
buf[0] = mdcPacketTagByte
buf[1] = sha1.Size
w.h.Write(buf[:2])
digest := w.h.Sum(nil)
copy(buf[2:], digest)
_, err = w.w.Write(buf[:])
if err != nil {
return
}
return w.w.Close()
}
// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
type noOpCloser struct {
w io.Writer
}
func (c noOpCloser) Write(data []byte) (n int, err error) {
return c.w.Write(data)
}
func (c noOpCloser) Close() error {
return nil
}
// SerializeSymmetricallyEncrypted serializes a symmetrically encrypted packet
// to w and returns a WriteCloser to which the to-be-encrypted packets can be
// written.
// If config is nil, sensible defaults will be used.
func SerializeSymmetricallyEncrypted(w io.Writer, c CipherFunction, key []byte, config *Config) (Contents io.WriteCloser, err error) {
if c.KeySize() != len(key) {
return nil, errors.InvalidArgumentError("SymmetricallyEncrypted.Serialize: bad key length")
}
writeCloser := noOpCloser{w}
ciphertext, err := serializeStreamHeader(writeCloser, packetTypeSymmetricallyEncryptedMDC)
if err != nil {
return
}
_, err = ciphertext.Write([]byte{symmetricallyEncryptedVersion})
if err != nil {
return
}
block := c.new(key)
blockSize := block.BlockSize()
iv := make([]byte, blockSize)
_, err = config.Random().Read(iv)
if err != nil {
return
}
s, prefix := NewOCFBEncrypter(block, iv, OCFBNoResync)
_, err = ciphertext.Write(prefix)
if err != nil {
return
}
plaintext := cipher.StreamWriter{S: s, W: ciphertext}
h := sha1.New()
h.Write(iv)
h.Write(iv[blockSize-2:])
Contents = &seMDCWriter{w: plaintext, h: h}
return
}

94
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/userattribute.go generated vendored Normal file
View file

@ -0,0 +1,94 @@
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"bytes"
"image"
"image/jpeg"
"io"
"io/ioutil"
)
const UserAttrImageSubpacket = 1
// UserAttribute is capable of storing other types of data about a user
// beyond name, email and a text comment. In practice, user attributes are typically used
// to store a signed thumbnail photo JPEG image of the user.
// See RFC 4880, section 5.12.
type UserAttribute struct {
Contents []*OpaqueSubpacket
}
// NewUserAttributePhoto creates a user attribute packet
// containing the given images.
func NewUserAttributePhoto(photos ...image.Image) (uat *UserAttribute, err error) {
uat = new(UserAttribute)
for _, photo := range photos {
var buf bytes.Buffer
// RFC 4880, Section 5.12.1.
data := []byte{
0x10, 0x00, // Little-endian image header length (16 bytes)
0x01, // Image header version 1
0x01, // JPEG
0, 0, 0, 0, // 12 reserved octets, must be all zero.
0, 0, 0, 0,
0, 0, 0, 0}
if _, err = buf.Write(data); err != nil {
return
}
if err = jpeg.Encode(&buf, photo, nil); err != nil {
return
}
uat.Contents = append(uat.Contents, &OpaqueSubpacket{
SubType: UserAttrImageSubpacket,
Contents: buf.Bytes()})
}
return
}
// NewUserAttribute creates a new user attribute packet containing the given subpackets.
func NewUserAttribute(contents ...*OpaqueSubpacket) *UserAttribute {
return &UserAttribute{Contents: contents}
}
func (uat *UserAttribute) parse(r io.Reader) (err error) {
// RFC 4880, section 5.13
b, err := ioutil.ReadAll(r)
if err != nil {
return
}
uat.Contents, err = OpaqueSubpackets(b)
return
}
// Serialize marshals the user attribute to w in the form of an OpenPGP packet, including
// header.
func (uat *UserAttribute) Serialize(w io.Writer) (err error) {
var buf bytes.Buffer
for _, sp := range uat.Contents {
err = sp.Serialize(&buf)
if err != nil {
return err
}
}
if err = serializeHeader(w, packetTypeUserAttribute, buf.Len()); err != nil {
return err
}
_, err = w.Write(buf.Bytes())
return
}
// ImageData returns zero or more byte slices, each containing
// JPEG File Interchange Format (JFIF), for each photo in the
// user attribute packet.
func (uat *UserAttribute) ImageData() (imageData [][]byte) {
for _, sp := range uat.Contents {
if sp.SubType == UserAttrImageSubpacket && len(sp.Contents) > 16 {
imageData = append(imageData, sp.Contents[16:])
}
}
return
}

160
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/userid.go generated vendored Normal file
View file

@ -0,0 +1,160 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package packet
import (
"io"
"io/ioutil"
"strings"
)
// UserId contains text that is intended to represent the name and email
// address of the key holder. See RFC 4880, section 5.11. By convention, this
// takes the form "Full Name (Comment) <email@example.com>"
type UserId struct {
Id string // By convention, this takes the form "Full Name (Comment) <email@example.com>" which is split out in the fields below.
Name, Comment, Email string
}
func hasInvalidCharacters(s string) bool {
for _, c := range s {
switch c {
case '(', ')', '<', '>', 0:
return true
}
}
return false
}
// NewUserId returns a UserId or nil if any of the arguments contain invalid
// characters. The invalid characters are '\x00', '(', ')', '<' and '>'
func NewUserId(name, comment, email string) *UserId {
// RFC 4880 doesn't deal with the structure of userid strings; the
// name, comment and email form is just a convention. However, there's
// no convention about escaping the metacharacters and GPG just refuses
// to create user ids where, say, the name contains a '('. We mirror
// this behaviour.
if hasInvalidCharacters(name) || hasInvalidCharacters(comment) || hasInvalidCharacters(email) {
return nil
}
uid := new(UserId)
uid.Name, uid.Comment, uid.Email = name, comment, email
uid.Id = name
if len(comment) > 0 {
if len(uid.Id) > 0 {
uid.Id += " "
}
uid.Id += "("
uid.Id += comment
uid.Id += ")"
}
if len(email) > 0 {
if len(uid.Id) > 0 {
uid.Id += " "
}
uid.Id += "<"
uid.Id += email
uid.Id += ">"
}
return uid
}
func (uid *UserId) parse(r io.Reader) (err error) {
// RFC 4880, section 5.11
b, err := ioutil.ReadAll(r)
if err != nil {
return
}
uid.Id = string(b)
uid.Name, uid.Comment, uid.Email = parseUserId(uid.Id)
return
}
// Serialize marshals uid to w in the form of an OpenPGP packet, including
// header.
func (uid *UserId) Serialize(w io.Writer) error {
err := serializeHeader(w, packetTypeUserId, len(uid.Id))
if err != nil {
return err
}
_, err = w.Write([]byte(uid.Id))
return err
}
// parseUserId extracts the name, comment and email from a user id string that
// is formatted as "Full Name (Comment) <email@example.com>".
func parseUserId(id string) (name, comment, email string) {
var n, c, e struct {
start, end int
}
var state int
for offset, rune := range id {
switch state {
case 0:
// Entering name
n.start = offset
state = 1
fallthrough
case 1:
// In name
if rune == '(' {
state = 2
n.end = offset
} else if rune == '<' {
state = 5
n.end = offset
}
case 2:
// Entering comment
c.start = offset
state = 3
fallthrough
case 3:
// In comment
if rune == ')' {
state = 4
c.end = offset
}
case 4:
// Between comment and email
if rune == '<' {
state = 5
}
case 5:
// Entering email
e.start = offset
state = 6
fallthrough
case 6:
// In email
if rune == '>' {
state = 7
e.end = offset
}
default:
// After email
}
}
switch state {
case 1:
// ended in the name
n.end = len(id)
case 3:
// ended in comment
c.end = len(id)
case 6:
// ended in email
e.end = len(id)
}
name = strings.TrimSpace(id[n.start:n.end])
comment = strings.TrimSpace(id[c.start:c.end])
email = strings.TrimSpace(id[e.start:e.end])
return
}

508
vendor/github.com/ProtonMail/go-crypto/openpgp/read.go generated vendored Normal file
View file

@ -0,0 +1,508 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package openpgp implements high level operations on OpenPGP messages.
package openpgp // import "github.com/ProtonMail/go-crypto/openpgp"
import (
"crypto"
_ "crypto/sha256"
"hash"
"io"
"strconv"
"github.com/ProtonMail/go-crypto/openpgp/armor"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/packet"
)
// SignatureType is the armor type for a PGP signature.
var SignatureType = "PGP SIGNATURE"
// readArmored reads an armored block with the given type.
func readArmored(r io.Reader, expectedType string) (body io.Reader, err error) {
block, err := armor.Decode(r)
if err != nil {
return
}
if block.Type != expectedType {
return nil, errors.InvalidArgumentError("expected '" + expectedType + "', got: " + block.Type)
}
return block.Body, nil
}
// MessageDetails contains the result of parsing an OpenPGP encrypted and/or
// signed message.
type MessageDetails struct {
IsEncrypted bool // true if the message was encrypted.
EncryptedToKeyIds []uint64 // the list of recipient key ids.
IsSymmetricallyEncrypted bool // true if a passphrase could have decrypted the message.
DecryptedWith Key // the private key used to decrypt the message, if any.
IsSigned bool // true if the message is signed.
SignedByKeyId uint64 // the key id of the signer, if any.
SignedBy *Key // the key of the signer, if available.
LiteralData *packet.LiteralData // the metadata of the contents
UnverifiedBody io.Reader // the contents of the message.
// If IsSigned is true and SignedBy is non-zero then the signature will
// be verified as UnverifiedBody is read. The signature cannot be
// checked until the whole of UnverifiedBody is read so UnverifiedBody
// must be consumed until EOF before the data can be trusted. Even if a
// message isn't signed (or the signer is unknown) the data may contain
// an authentication code that is only checked once UnverifiedBody has
// been consumed. Once EOF has been seen, the following fields are
// valid. (An authentication code failure is reported as a
// SignatureError error when reading from UnverifiedBody.)
Signature *packet.Signature // the signature packet itself.
SignatureError error // nil if the signature is good.
UnverifiedSignatures []*packet.Signature // all other unverified signature packets.
decrypted io.ReadCloser
}
// A PromptFunction is used as a callback by functions that may need to decrypt
// a private key, or prompt for a passphrase. It is called with a list of
// acceptable, encrypted private keys and a boolean that indicates whether a
// passphrase is usable. It should either decrypt a private key or return a
// passphrase to try. If the decrypted private key or given passphrase isn't
// correct, the function will be called again, forever. Any error returned will
// be passed up.
type PromptFunction func(keys []Key, symmetric bool) ([]byte, error)
// A keyEnvelopePair is used to store a private key with the envelope that
// contains a symmetric key, encrypted with that key.
type keyEnvelopePair struct {
key Key
encryptedKey *packet.EncryptedKey
}
// ReadMessage parses an OpenPGP message that may be signed and/or encrypted.
// The given KeyRing should contain both public keys (for signature
// verification) and, possibly encrypted, private keys for decrypting.
// If config is nil, sensible defaults will be used.
func ReadMessage(r io.Reader, keyring KeyRing, prompt PromptFunction, config *packet.Config) (md *MessageDetails, err error) {
var p packet.Packet
var symKeys []*packet.SymmetricKeyEncrypted
var pubKeys []keyEnvelopePair
// Integrity protected encrypted packet: SymmetricallyEncrypted or AEADEncrypted
var edp packet.EncryptedDataPacket
packets := packet.NewReader(r)
md = new(MessageDetails)
md.IsEncrypted = true
// The message, if encrypted, starts with a number of packets
// containing an encrypted decryption key. The decryption key is either
// encrypted to a public key, or with a passphrase. This loop
// collects these packets.
ParsePackets:
for {
p, err = packets.Next()
if err != nil {
return nil, err
}
switch p := p.(type) {
case *packet.SymmetricKeyEncrypted:
// This packet contains the decryption key encrypted with a passphrase.
md.IsSymmetricallyEncrypted = true
symKeys = append(symKeys, p)
case *packet.EncryptedKey:
// This packet contains the decryption key encrypted to a public key.
md.EncryptedToKeyIds = append(md.EncryptedToKeyIds, p.KeyId)
switch p.Algo {
case packet.PubKeyAlgoRSA, packet.PubKeyAlgoRSAEncryptOnly, packet.PubKeyAlgoElGamal, packet.PubKeyAlgoECDH:
break
default:
continue
}
var keys []Key
if p.KeyId == 0 {
keys = keyring.DecryptionKeys()
} else {
keys = keyring.KeysById(p.KeyId)
}
for _, k := range keys {
pubKeys = append(pubKeys, keyEnvelopePair{k, p})
}
case *packet.SymmetricallyEncrypted, *packet.AEADEncrypted:
edp = p.(packet.EncryptedDataPacket)
break ParsePackets
case *packet.Compressed, *packet.LiteralData, *packet.OnePassSignature:
// This message isn't encrypted.
if len(symKeys) != 0 || len(pubKeys) != 0 {
return nil, errors.StructuralError("key material not followed by encrypted message")
}
packets.Unread(p)
return readSignedMessage(packets, nil, keyring, config)
}
}
var candidates []Key
var decrypted io.ReadCloser
// Now that we have the list of encrypted keys we need to decrypt at
// least one of them or, if we cannot, we need to call the prompt
// function so that it can decrypt a key or give us a passphrase.
FindKey:
for {
// See if any of the keys already have a private key available
candidates = candidates[:0]
candidateFingerprints := make(map[string]bool)
for _, pk := range pubKeys {
if pk.key.PrivateKey == nil {
continue
}
if !pk.key.PrivateKey.Encrypted {
if len(pk.encryptedKey.Key) == 0 {
errDec := pk.encryptedKey.Decrypt(pk.key.PrivateKey, config)
if errDec != nil {
continue
}
}
// Try to decrypt symmetrically encrypted
decrypted, err = edp.Decrypt(pk.encryptedKey.CipherFunc, pk.encryptedKey.Key)
if err != nil && err != errors.ErrKeyIncorrect {
return nil, err
}
if decrypted != nil {
md.DecryptedWith = pk.key
break FindKey
}
} else {
fpr := string(pk.key.PublicKey.Fingerprint[:])
if v := candidateFingerprints[fpr]; v {
continue
}
candidates = append(candidates, pk.key)
candidateFingerprints[fpr] = true
}
}
if len(candidates) == 0 && len(symKeys) == 0 {
return nil, errors.ErrKeyIncorrect
}
if prompt == nil {
return nil, errors.ErrKeyIncorrect
}
passphrase, err := prompt(candidates, len(symKeys) != 0)
if err != nil {
return nil, err
}
// Try the symmetric passphrase first
if len(symKeys) != 0 && passphrase != nil {
for _, s := range symKeys {
key, cipherFunc, err := s.Decrypt(passphrase)
// On wrong passphrase, session key decryption is very likely to result in an invalid cipherFunc:
// only for < 5% of cases we will proceed to decrypt the data
if err == nil {
decrypted, err = edp.Decrypt(cipherFunc, key)
// TODO: ErrKeyIncorrect is no longer thrown on SEIP decryption,
// but it might still be relevant for when we implement AEAD decryption (otherwise, remove?)
if err != nil && err != errors.ErrKeyIncorrect {
return nil, err
}
if decrypted != nil {
break FindKey
}
}
}
}
}
md.decrypted = decrypted
if err := packets.Push(decrypted); err != nil {
return nil, err
}
mdFinal, sensitiveParsingErr := readSignedMessage(packets, md, keyring, config)
if sensitiveParsingErr != nil {
return nil, errors.StructuralError("parsing error")
}
return mdFinal, nil
}
// readSignedMessage reads a possibly signed message if mdin is non-zero then
// that structure is updated and returned. Otherwise a fresh MessageDetails is
// used.
func readSignedMessage(packets *packet.Reader, mdin *MessageDetails, keyring KeyRing, config *packet.Config) (md *MessageDetails, err error) {
if mdin == nil {
mdin = new(MessageDetails)
}
md = mdin
var p packet.Packet
var h hash.Hash
var wrappedHash hash.Hash
var prevLast bool
FindLiteralData:
for {
p, err = packets.Next()
if err != nil {
return nil, err
}
switch p := p.(type) {
case *packet.Compressed:
if err := packets.Push(p.Body); err != nil {
return nil, err
}
case *packet.OnePassSignature:
if prevLast {
return nil, errors.UnsupportedError("nested signature packets")
}
if p.IsLast {
prevLast = true
}
h, wrappedHash, err = hashForSignature(p.Hash, p.SigType)
if err != nil {
md.SignatureError = err
}
md.IsSigned = true
md.SignedByKeyId = p.KeyId
keys := keyring.KeysByIdUsage(p.KeyId, packet.KeyFlagSign)
if len(keys) > 0 {
md.SignedBy = &keys[0]
}
case *packet.LiteralData:
md.LiteralData = p
break FindLiteralData
}
}
if md.IsSigned && md.SignatureError == nil {
md.UnverifiedBody = &signatureCheckReader{packets, h, wrappedHash, md, config}
} else if md.decrypted != nil {
md.UnverifiedBody = checkReader{md}
} else {
md.UnverifiedBody = md.LiteralData.Body
}
return md, nil
}
// hashForSignature returns a pair of hashes that can be used to verify a
// signature. The signature may specify that the contents of the signed message
// should be preprocessed (i.e. to normalize line endings). Thus this function
// returns two hashes. The second should be used to hash the message itself and
// performs any needed preprocessing.
func hashForSignature(hashId crypto.Hash, sigType packet.SignatureType) (hash.Hash, hash.Hash, error) {
if hashId == crypto.MD5 {
return nil, nil, errors.UnsupportedError("insecure hash algorithm: MD5")
}
if !hashId.Available() {
return nil, nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hashId)))
}
h := hashId.New()
switch sigType {
case packet.SigTypeBinary:
return h, h, nil
case packet.SigTypeText:
return h, NewCanonicalTextHash(h), nil
}
return nil, nil, errors.UnsupportedError("unsupported signature type: " + strconv.Itoa(int(sigType)))
}
// checkReader wraps an io.Reader from a LiteralData packet. When it sees EOF
// it closes the ReadCloser from any SymmetricallyEncrypted packet to trigger
// MDC checks.
type checkReader struct {
md *MessageDetails
}
func (cr checkReader) Read(buf []byte) (int, error) {
n, sensitiveParsingError := cr.md.LiteralData.Body.Read(buf)
if sensitiveParsingError == io.EOF {
mdcErr := cr.md.decrypted.Close()
if mdcErr != nil {
return n, mdcErr
}
return n, io.EOF
}
if sensitiveParsingError != nil {
return n, errors.StructuralError("parsing error")
}
return n, nil
}
// signatureCheckReader wraps an io.Reader from a LiteralData packet and hashes
// the data as it is read. When it sees an EOF from the underlying io.Reader
// it parses and checks a trailing Signature packet and triggers any MDC checks.
type signatureCheckReader struct {
packets *packet.Reader
h, wrappedHash hash.Hash
md *MessageDetails
config *packet.Config
}
func (scr *signatureCheckReader) Read(buf []byte) (int, error) {
n, sensitiveParsingError := scr.md.LiteralData.Body.Read(buf)
// Hash only if required
if scr.md.SignedBy != nil {
scr.wrappedHash.Write(buf[:n])
}
if sensitiveParsingError == io.EOF {
var p packet.Packet
var readError error
var sig *packet.Signature
p, readError = scr.packets.Next()
for readError == nil {
var ok bool
if sig, ok = p.(*packet.Signature); ok {
if sig.Version == 5 && (sig.SigType == 0x00 || sig.SigType == 0x01) {
sig.Metadata = scr.md.LiteralData
}
// If signature KeyID matches
if scr.md.SignedBy != nil && *sig.IssuerKeyId == scr.md.SignedByKeyId {
scr.md.Signature = sig
scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
if scr.md.SignatureError == nil && scr.md.Signature.SigExpired(scr.config.Now()) {
scr.md.SignatureError = errors.ErrSignatureExpired
}
} else {
scr.md.UnverifiedSignatures = append(scr.md.UnverifiedSignatures, sig)
}
}
p, readError = scr.packets.Next()
}
if scr.md.SignedBy != nil && scr.md.Signature == nil {
if scr.md.UnverifiedSignatures == nil {
scr.md.SignatureError = errors.StructuralError("LiteralData not followed by signature")
} else {
scr.md.SignatureError = errors.StructuralError("No matching signature found")
}
}
// The SymmetricallyEncrypted packet, if any, might have an
// unsigned hash of its own. In order to check this we need to
// close that Reader.
if scr.md.decrypted != nil {
mdcErr := scr.md.decrypted.Close()
if mdcErr != nil {
return n, mdcErr
}
}
return n, io.EOF
}
if sensitiveParsingError != nil {
return n, errors.StructuralError("parsing error")
}
return n, nil
}
// CheckDetachedSignature takes a signed file and a detached signature and
// returns the signer if the signature is valid. If the signer isn't known,
// ErrUnknownIssuer is returned.
func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader, config *packet.Config) (signer *Entity, err error) {
var expectedHashes []crypto.Hash
return CheckDetachedSignatureAndHash(keyring, signed, signature, expectedHashes, config)
}
// CheckDetachedSignatureAndHash performs the same actions as
// CheckDetachedSignature and checks that the expected hash functions were used.
func CheckDetachedSignatureAndHash(keyring KeyRing, signed, signature io.Reader, expectedHashes []crypto.Hash, config *packet.Config) (signer *Entity, err error) {
var issuerKeyId uint64
var hashFunc crypto.Hash
var sigType packet.SignatureType
var keys []Key
var p packet.Packet
expectedHashesLen := len(expectedHashes)
packets := packet.NewReader(signature)
var sig *packet.Signature
for {
p, err = packets.Next()
if err == io.EOF {
return nil, errors.ErrUnknownIssuer
}
if err != nil {
return nil, err
}
var ok bool
sig, ok = p.(*packet.Signature)
if !ok {
return nil, errors.StructuralError("non signature packet found")
}
if sig.IssuerKeyId == nil {
return nil, errors.StructuralError("signature doesn't have an issuer")
}
issuerKeyId = *sig.IssuerKeyId
hashFunc = sig.Hash
sigType = sig.SigType
for i, expectedHash := range expectedHashes {
if hashFunc == expectedHash {
break
}
if i+1 == expectedHashesLen {
return nil, errors.StructuralError("hash algorithm mismatch with cleartext message headers")
}
}
keys = keyring.KeysByIdUsage(issuerKeyId, packet.KeyFlagSign)
if len(keys) > 0 {
break
}
}
if len(keys) == 0 {
panic("unreachable")
}
h, wrappedHash, err := hashForSignature(hashFunc, sigType)
if err != nil {
return nil, err
}
if _, err := io.Copy(wrappedHash, signed); err != nil && err != io.EOF {
return nil, err
}
for _, key := range keys {
err = key.PublicKey.VerifySignature(h, sig)
if err == nil {
now := config.Now()
if sig.SigExpired(now) {
return key.Entity, errors.ErrSignatureExpired
}
if key.PublicKey.KeyExpired(key.SelfSignature, now) {
return key.Entity, errors.ErrKeyExpired
}
return key.Entity, nil
}
}
return nil, err
}
// CheckArmoredDetachedSignature performs the same actions as
// CheckDetachedSignature but expects the signature to be armored.
func CheckArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader, config *packet.Config) (signer *Entity, err error) {
body, err := readArmored(signature, SignatureType)
if err != nil {
return
}
return CheckDetachedSignature(keyring, signed, body, config)
}

173
vendor/github.com/ProtonMail/go-crypto/openpgp/read_write_test_data.go generated vendored Normal file
View file

File diff suppressed because one or more lines are too long

367
vendor/github.com/ProtonMail/go-crypto/openpgp/s2k/s2k.go generated vendored Normal file
View file

@ -0,0 +1,367 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package s2k implements the various OpenPGP string-to-key transforms as
// specified in RFC 4800 section 3.7.1.
package s2k // import "github.com/ProtonMail/go-crypto/openpgp/s2k"
import (
"crypto"
"hash"
"io"
"strconv"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
)
// Config collects configuration parameters for s2k key-stretching
// transformations. A nil *Config is valid and results in all default
// values. Currently, Config is used only by the Serialize function in
// this package.
type Config struct {
// S2KMode is the mode of s2k function.
// It can be 0 (simple), 1(salted), 3(iterated)
// 2(reserved) 100-110(private/experimental).
S2KMode uint8
// Hash is the default hash function to be used. If
// nil, SHA256 is used.
Hash crypto.Hash
// S2KCount is only used for symmetric encryption. It
// determines the strength of the passphrase stretching when
// the said passphrase is hashed to produce a key. S2KCount
// should be between 65536 and 65011712, inclusive. If Config
// is nil or S2KCount is 0, the value 16777216 used. Not all
// values in the above range can be represented. S2KCount will
// be rounded up to the next representable value if it cannot
// be encoded exactly. See RFC 4880 Section 3.7.1.3.
S2KCount int
}
// Params contains all the parameters of the s2k packet
type Params struct {
// mode is the mode of s2k function.
// It can be 0 (simple), 1(salted), 3(iterated)
// 2(reserved) 100-110(private/experimental).
mode uint8
// hashId is the ID of the hash function used in any of the modes
hashId byte
// salt is a byte array to use as a salt in hashing process
salt []byte
// countByte is used to determine how many rounds of hashing are to
// be performed in s2k mode 3. See RFC 4880 Section 3.7.1.3.
countByte byte
}
func (c *Config) hash() crypto.Hash {
if c == nil || uint(c.Hash) == 0 {
return crypto.SHA256
}
return c.Hash
}
// EncodedCount get encoded count
func (c *Config) EncodedCount() uint8 {
if c == nil || c.S2KCount == 0 {
return 224 // The common case. Corresponding to 16777216
}
i := c.S2KCount
switch {
case i < 65536:
i = 65536
case i > 65011712:
i = 65011712
}
return encodeCount(i)
}
// encodeCount converts an iterative "count" in the range 1024 to
// 65011712, inclusive, to an encoded count. The return value is the
// octet that is actually stored in the GPG file. encodeCount panics
// if i is not in the above range (encodedCount above takes care to
// pass i in the correct range). See RFC 4880 Section 3.7.7.1.
func encodeCount(i int) uint8 {
if i < 65536 || i > 65011712 {
panic("count arg i outside the required range")
}
for encoded := 96; encoded < 256; encoded++ {
count := decodeCount(uint8(encoded))
if count >= i {
return uint8(encoded)
}
}
return 255
}
// decodeCount returns the s2k mode 3 iterative "count" corresponding to
// the encoded octet c.
func decodeCount(c uint8) int {
return (16 + int(c&15)) << (uint32(c>>4) + 6)
}
// Simple writes to out the result of computing the Simple S2K function (RFC
// 4880, section 3.7.1.1) using the given hash and input passphrase.
func Simple(out []byte, h hash.Hash, in []byte) {
Salted(out, h, in, nil)
}
var zero [1]byte
// Salted writes to out the result of computing the Salted S2K function (RFC
// 4880, section 3.7.1.2) using the given hash, input passphrase and salt.
func Salted(out []byte, h hash.Hash, in []byte, salt []byte) {
done := 0
var digest []byte
for i := 0; done < len(out); i++ {
h.Reset()
for j := 0; j < i; j++ {
h.Write(zero[:])
}
h.Write(salt)
h.Write(in)
digest = h.Sum(digest[:0])
n := copy(out[done:], digest)
done += n
}
}
// Iterated writes to out the result of computing the Iterated and Salted S2K
// function (RFC 4880, section 3.7.1.3) using the given hash, input passphrase,
// salt and iteration count.
func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
combined := make([]byte, len(in)+len(salt))
copy(combined, salt)
copy(combined[len(salt):], in)
if count < len(combined) {
count = len(combined)
}
done := 0
var digest []byte
for i := 0; done < len(out); i++ {
h.Reset()
for j := 0; j < i; j++ {
h.Write(zero[:])
}
written := 0
for written < count {
if written+len(combined) > count {
todo := count - written
h.Write(combined[:todo])
written = count
} else {
h.Write(combined)
written += len(combined)
}
}
digest = h.Sum(digest[:0])
n := copy(out[done:], digest)
done += n
}
}
// Generate generates valid parameters from given configuration.
// It will enforce salted + hashed s2k method
func Generate(rand io.Reader, c *Config) (*Params, error) {
hashId, ok := HashToHashId(c.Hash)
if !ok {
return nil, errors.UnsupportedError("no such hash")
}
params := &Params{
mode: 3, // Enforce iterared + salted method
hashId: hashId,
salt: make([]byte, 8),
countByte: c.EncodedCount(),
}
if _, err := io.ReadFull(rand, params.salt); err != nil {
return nil, err
}
return params, nil
}
// Parse reads a binary specification for a string-to-key transformation from r
// and returns a function which performs that transform. If the S2K is a special
// GNU extension that indicates that the private key is missing, then the error
// returned is errors.ErrDummyPrivateKey.
func Parse(r io.Reader) (f func(out, in []byte), err error) {
params, err := ParseIntoParams(r)
if err != nil {
return nil, err
}
return params.Function()
}
// ParseIntoParams reads a binary specification for a string-to-key
// transformation from r and returns a struct describing the s2k parameters.
func ParseIntoParams(r io.Reader) (params *Params, err error) {
var buf [9]byte
_, err = io.ReadFull(r, buf[:2])
if err != nil {
return
}
params = &Params{
mode: buf[0],
hashId: buf[1],
}
switch params.mode {
case 0:
return params, nil
case 1:
_, err = io.ReadFull(r, buf[:8])
if err != nil {
return nil, err
}
params.salt = buf[:8]
return params, nil
case 3:
_, err = io.ReadFull(r, buf[:9])
if err != nil {
return nil, err
}
params.salt = buf[:8]
params.countByte = buf[8]
return params, nil
case 101:
// This is a GNU extension. See
// https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/DETAILS;h=fe55ae16ab4e26d8356dc574c9e8bc935e71aef1;hb=23191d7851eae2217ecdac6484349849a24fd94a#l1109
if _, err = io.ReadFull(r, buf[:4]); err != nil {
return nil, err
}
if buf[0] == 'G' && buf[1] == 'N' && buf[2] == 'U' && buf[3] == 1 {
return params, nil
}
return nil, errors.UnsupportedError("GNU S2K extension")
}
return nil, errors.UnsupportedError("S2K function")
}
func (params *Params) Dummy() bool {
return params != nil && params.mode == 101
}
func (params *Params) Function() (f func(out, in []byte), err error) {
if params.Dummy() {
return nil, errors.ErrDummyPrivateKey("dummy key found")
}
hashObj, ok := HashIdToHash(params.hashId)
if !ok {
return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(params.hashId)))
}
if !hashObj.Available() {
return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hashObj)))
}
switch params.mode {
case 0:
f := func(out, in []byte) {
Simple(out, hashObj.New(), in)
}
return f, nil
case 1:
f := func(out, in []byte) {
Salted(out, hashObj.New(), in, params.salt)
}
return f, nil
case 3:
f := func(out, in []byte) {
Iterated(out, hashObj.New(), in, params.salt, decodeCount(params.countByte))
}
return f, nil
}
return nil, errors.UnsupportedError("S2K function")
}
func (params *Params) Serialize(w io.Writer) (err error) {
if _, err = w.Write([]byte{params.mode}); err != nil {
return
}
if _, err = w.Write([]byte{params.hashId}); err != nil {
return
}
if params.Dummy() {
_, err = w.Write(append([]byte("GNU"), 1))
return
}
if params.mode > 0 {
if _, err = w.Write(params.salt); err != nil {
return
}
if params.mode == 3 {
_, err = w.Write([]byte{params.countByte})
}
}
return
}
// Serialize salts and stretches the given passphrase and writes the
// resulting key into key. It also serializes an S2K descriptor to
// w. The key stretching can be configured with c, which may be
// nil. In that case, sensible defaults will be used.
func Serialize(w io.Writer, key []byte, rand io.Reader, passphrase []byte, c *Config) error {
params, err := Generate(rand, c)
if err != nil {
return err
}
err = params.Serialize(w)
if err != nil {
return err
}
f, err := params.Function()
if err != nil {
return err
}
f(key, passphrase)
return nil
}
// HashIdToHash returns a crypto.Hash which corresponds to the given OpenPGP
// hash id.
func HashIdToHash(id byte) (h crypto.Hash, ok bool) {
if hash, ok := algorithm.HashById[id]; ok {
return hash.HashFunc(), true
}
return 0, false
}
// HashIdToString returns the name of the hash function corresponding to the
// given OpenPGP hash id.
func HashIdToString(id byte) (name string, ok bool) {
if hash, ok := algorithm.HashById[id]; ok {
return hash.String(), true
}
return "", false
}
// HashIdToHash returns an OpenPGP hash id which corresponds the given Hash.
func HashToHashId(h crypto.Hash) (id byte, ok bool) {
for id, hash := range algorithm.HashById {
if hash.HashFunc() == h {
return id, true
}
}
return 0, false
}

568
vendor/github.com/ProtonMail/go-crypto/openpgp/write.go generated vendored Normal file
View file

@ -0,0 +1,568 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
"crypto"
"hash"
"io"
"strconv"
"time"
"github.com/ProtonMail/go-crypto/openpgp/armor"
"github.com/ProtonMail/go-crypto/openpgp/errors"
"github.com/ProtonMail/go-crypto/openpgp/packet"
"github.com/ProtonMail/go-crypto/openpgp/s2k"
)
// DetachSign signs message with the private key from signer (which must
// already have been decrypted) and writes the signature to w.
// If config is nil, sensible defaults will be used.
func DetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
return detachSign(w, signer, message, packet.SigTypeBinary, config)
}
// ArmoredDetachSign signs message with the private key from signer (which
// must already have been decrypted) and writes an armored signature to w.
// If config is nil, sensible defaults will be used.
func ArmoredDetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) (err error) {
return armoredDetachSign(w, signer, message, packet.SigTypeBinary, config)
}
// DetachSignText signs message (after canonicalising the line endings) with
// the private key from signer (which must already have been decrypted) and
// writes the signature to w.
// If config is nil, sensible defaults will be used.
func DetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
return detachSign(w, signer, message, packet.SigTypeText, config)
}
// ArmoredDetachSignText signs message (after canonicalising the line endings)
// with the private key from signer (which must already have been decrypted)
// and writes an armored signature to w.
// If config is nil, sensible defaults will be used.
func ArmoredDetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
return armoredDetachSign(w, signer, message, packet.SigTypeText, config)
}
func armoredDetachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
out, err := armor.Encode(w, SignatureType, nil)
if err != nil {
return
}
err = detachSign(out, signer, message, sigType, config)
if err != nil {
return
}
return out.Close()
}
func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
signingKey, ok := signer.SigningKeyById(config.Now(), config.SigningKey())
if !ok {
return errors.InvalidArgumentError("no valid signing keys")
}
if signingKey.PrivateKey == nil {
return errors.InvalidArgumentError("signing key doesn't have a private key")
}
if signingKey.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing key is encrypted")
}
sig := new(packet.Signature)
sig.SigType = sigType
sig.PubKeyAlgo = signingKey.PrivateKey.PubKeyAlgo
sig.Hash = config.Hash()
sig.CreationTime = config.Now()
sigLifetimeSecs := config.SigLifetime()
sig.SigLifetimeSecs = &sigLifetimeSecs
sig.IssuerKeyId = &signingKey.PrivateKey.KeyId
h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
if err != nil {
return
}
if _, err = io.Copy(wrappedHash, message); err != nil {
return err
}
err = sig.Sign(h, signingKey.PrivateKey, config)
if err != nil {
return
}
return sig.Serialize(w)
}
// FileHints contains metadata about encrypted files. This metadata is, itself,
// encrypted.
type FileHints struct {
// IsBinary can be set to hint that the contents are binary data.
IsBinary bool
// FileName hints at the name of the file that should be written. It's
// truncated to 255 bytes if longer. It may be empty to suggest that the
// file should not be written to disk. It may be equal to "_CONSOLE" to
// suggest the data should not be written to disk.
FileName string
// ModTime contains the modification time of the file, or the zero time if not applicable.
ModTime time.Time
}
// SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
// The resulting WriteCloser must be closed after the contents of the file have
// been written.
// If config is nil, sensible defaults will be used.
func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
if hints == nil {
hints = &FileHints{}
}
key, err := packet.SerializeSymmetricKeyEncrypted(ciphertext, passphrase, config)
if err != nil {
return
}
var w io.WriteCloser
if config.AEAD() != nil {
w, err = packet.SerializeAEADEncrypted(ciphertext, key, config.Cipher(), config.AEAD().Mode(), config)
if err != nil {
return
}
} else {
w, err = packet.SerializeSymmetricallyEncrypted(ciphertext, config.Cipher(), key, config)
if err != nil {
return
}
}
literalData := w
if algo := config.Compression(); algo != packet.CompressionNone {
var compConfig *packet.CompressionConfig
if config != nil {
compConfig = config.CompressionConfig
}
literalData, err = packet.SerializeCompressed(w, algo, compConfig)
if err != nil {
return
}
}
var epochSeconds uint32
if !hints.ModTime.IsZero() {
epochSeconds = uint32(hints.ModTime.Unix())
}
return packet.SerializeLiteral(literalData, hints.IsBinary, hints.FileName, epochSeconds)
}
// intersectPreferences mutates and returns a prefix of a that contains only
// the values in the intersection of a and b. The order of a is preserved.
func intersectPreferences(a []uint8, b []uint8) (intersection []uint8) {
var j int
for _, v := range a {
for _, v2 := range b {
if v == v2 {
a[j] = v
j++
break
}
}
}
return a[:j]
}
func hashToHashId(h crypto.Hash) uint8 {
v, ok := s2k.HashToHashId(h)
if !ok {
panic("tried to convert unknown hash")
}
return v
}
// EncryptText encrypts a message to a number of recipients and, optionally,
// signs it. Optional information is contained in 'hints', also encrypted, that
// aids the recipients in processing the message. The resulting WriteCloser
// must be closed after the contents of the file have been written. If config
// is nil, sensible defaults will be used. The signing is done in text mode.
func EncryptText(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
return encrypt(ciphertext, ciphertext, to, signed, hints, packet.SigTypeText, config)
}
// Encrypt encrypts a message to a number of recipients and, optionally, signs
// it. hints contains optional information, that is also encrypted, that aids
// the recipients in processing the message. The resulting WriteCloser must
// be closed after the contents of the file have been written.
// If config is nil, sensible defaults will be used.
func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
return encrypt(ciphertext, ciphertext, to, signed, hints, packet.SigTypeBinary, config)
}
// EncryptSplit encrypts a message to a number of recipients and, optionally, signs
// it. hints contains optional information, that is also encrypted, that aids
// the recipients in processing the message. The resulting WriteCloser must
// be closed after the contents of the file have been written.
// If config is nil, sensible defaults will be used.
func EncryptSplit(keyWriter io.Writer, dataWriter io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
return encrypt(keyWriter, dataWriter, to, signed, hints, packet.SigTypeBinary, config)
}
// EncryptTextSplit encrypts a message to a number of recipients and, optionally, signs
// it. hints contains optional information, that is also encrypted, that aids
// the recipients in processing the message. The resulting WriteCloser must
// be closed after the contents of the file have been written.
// If config is nil, sensible defaults will be used.
func EncryptTextSplit(keyWriter io.Writer, dataWriter io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
return encrypt(keyWriter, dataWriter, to, signed, hints, packet.SigTypeText, config)
}
// writeAndSign writes the data as a payload package and, optionally, signs
// it. hints contains optional information, that is also encrypted,
// that aids the recipients in processing the message. The resulting
// WriteCloser must be closed after the contents of the file have been
// written. If config is nil, sensible defaults will be used.
func writeAndSign(payload io.WriteCloser, candidateHashes []uint8, signed *Entity, hints *FileHints, sigType packet.SignatureType, config *packet.Config) (plaintext io.WriteCloser, err error) {
var signer *packet.PrivateKey
if signed != nil {
signKey, ok := signed.SigningKeyById(config.Now(), config.SigningKey())
if !ok {
return nil, errors.InvalidArgumentError("no valid signing keys")
}
signer = signKey.PrivateKey
if signer == nil {
return nil, errors.InvalidArgumentError("no private key in signing key")
}
if signer.Encrypted {
return nil, errors.InvalidArgumentError("signing key must be decrypted")
}
}
var hash crypto.Hash
for _, hashId := range candidateHashes {
if h, ok := s2k.HashIdToHash(hashId); ok && h.Available() {
hash = h
break
}
}
// If the hash specified by config is a candidate, we'll use that.
if configuredHash := config.Hash(); configuredHash.Available() {
for _, hashId := range candidateHashes {
if h, ok := s2k.HashIdToHash(hashId); ok && h == configuredHash {
hash = h
break
}
}
}
if hash == 0 {
hashId := candidateHashes[0]
name, ok := s2k.HashIdToString(hashId)
if !ok {
name = "#" + strconv.Itoa(int(hashId))
}
return nil, errors.InvalidArgumentError("cannot encrypt because no candidate hash functions are compiled in. (Wanted " + name + " in this case.)")
}
if signer != nil {
ops := &packet.OnePassSignature{
SigType: sigType,
Hash: hash,
PubKeyAlgo: signer.PubKeyAlgo,
KeyId: signer.KeyId,
IsLast: true,
}
if err := ops.Serialize(payload); err != nil {
return nil, err
}
}
if hints == nil {
hints = &FileHints{}
}
w := payload
if signer != nil {
// If we need to write a signature packet after the literal
// data then we need to stop literalData from closing
// encryptedData.
w = noOpCloser{w}
}
var epochSeconds uint32
if !hints.ModTime.IsZero() {
epochSeconds = uint32(hints.ModTime.Unix())
}
literalData, err := packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
if err != nil {
return nil, err
}
if signer != nil {
h, wrappedHash, err := hashForSignature(hash, sigType)
if err != nil {
return nil, err
}
metadata := &packet.LiteralData{
Format: 't',
FileName: hints.FileName,
Time: epochSeconds,
}
if hints.IsBinary {
metadata.Format = 'b'
}
return signatureWriter{payload, literalData, hash, wrappedHash, h, signer, sigType, config, metadata}, nil
}
return literalData, nil
}
// encrypt encrypts a message to a number of recipients and, optionally, signs
// it. hints contains optional information, that is also encrypted, that aids
// the recipients in processing the message. The resulting WriteCloser must
// be closed after the contents of the file have been written.
// If config is nil, sensible defaults will be used.
func encrypt(keyWriter io.Writer, dataWriter io.Writer, to []*Entity, signed *Entity, hints *FileHints, sigType packet.SignatureType, config *packet.Config) (plaintext io.WriteCloser, err error) {
if len(to) == 0 {
return nil, errors.InvalidArgumentError("no encryption recipient provided")
}
// These are the possible ciphers that we'll use for the message.
candidateCiphers := []uint8{
uint8(packet.CipherAES128),
uint8(packet.CipherAES256),
uint8(packet.CipherCAST5),
}
// These are the possible hash functions that we'll use for the signature.
candidateHashes := []uint8{
hashToHashId(crypto.SHA256),
hashToHashId(crypto.SHA384),
hashToHashId(crypto.SHA512),
hashToHashId(crypto.SHA1),
hashToHashId(crypto.RIPEMD160),
}
candidateAeadModes := []uint8{
uint8(packet.AEADModeEAX),
uint8(packet.AEADModeOCB),
uint8(packet.AEADModeExperimentalGCM),
}
candidateCompression := []uint8{
uint8(packet.CompressionNone),
uint8(packet.CompressionZIP),
uint8(packet.CompressionZLIB),
}
// In the event that a recipient doesn't specify any supported ciphers
// or hash functions, these are the ones that we assume that every
// implementation supports.
defaultCiphers := candidateCiphers[0:1]
defaultHashes := candidateHashes[0:1]
defaultAeadModes := candidateAeadModes[0:1]
defaultCompression := candidateCompression[0:1]
encryptKeys := make([]Key, len(to))
// AEAD is used only if every key supports it.
aeadSupported := true
for i := range to {
var ok bool
encryptKeys[i], ok = to[i].EncryptionKey(config.Now())
if !ok {
return nil, errors.InvalidArgumentError("cannot encrypt a message to key id " + strconv.FormatUint(to[i].PrimaryKey.KeyId, 16) + " because it has no encryption keys")
}
sig := to[i].PrimaryIdentity().SelfSignature
if sig.AEAD == false {
aeadSupported = false
}
preferredSymmetric := sig.PreferredSymmetric
if len(preferredSymmetric) == 0 {
preferredSymmetric = defaultCiphers
}
preferredHashes := sig.PreferredHash
if len(preferredHashes) == 0 {
preferredHashes = defaultHashes
}
preferredAeadModes := sig.PreferredAEAD
if len(preferredAeadModes) == 0 {
preferredAeadModes = defaultAeadModes
}
preferredCompression := sig.PreferredCompression
if len(preferredCompression) == 0 {
preferredCompression = defaultCompression
}
candidateCiphers = intersectPreferences(candidateCiphers, preferredSymmetric)
candidateHashes = intersectPreferences(candidateHashes, preferredHashes)
candidateAeadModes = intersectPreferences(candidateAeadModes, preferredAeadModes)
candidateCompression = intersectPreferences(candidateCompression, preferredCompression)
}
if len(candidateCiphers) == 0 || len(candidateHashes) == 0 || len(candidateAeadModes) == 0 {
return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common algorithms")
}
cipher := packet.CipherFunction(candidateCiphers[0])
mode := packet.AEADMode(candidateAeadModes[0])
// If the cipher specified by config is a candidate, we'll use that.
configuredCipher := config.Cipher()
for _, c := range candidateCiphers {
cipherFunc := packet.CipherFunction(c)
if cipherFunc == configuredCipher {
cipher = cipherFunc
break
}
}
symKey := make([]byte, cipher.KeySize())
if _, err := io.ReadFull(config.Random(), symKey); err != nil {
return nil, err
}
for _, key := range encryptKeys {
if err := packet.SerializeEncryptedKey(keyWriter, key.PublicKey, cipher, symKey, config); err != nil {
return nil, err
}
}
var payload io.WriteCloser
if aeadSupported {
payload, err = packet.SerializeAEADEncrypted(dataWriter, symKey, cipher, mode, config)
if err != nil {
return
}
} else {
payload, err = packet.SerializeSymmetricallyEncrypted(dataWriter, cipher, symKey, config)
if err != nil {
return
}
}
payload, err = handleCompression(payload, candidateCompression, config)
if err != nil {
return nil, err
}
return writeAndSign(payload, candidateHashes, signed, hints, sigType, config)
}
// Sign signs a message. The resulting WriteCloser must be closed after the
// contents of the file have been written. hints contains optional information
// that aids the recipients in processing the message.
// If config is nil, sensible defaults will be used.
func Sign(output io.Writer, signed *Entity, hints *FileHints, config *packet.Config) (input io.WriteCloser, err error) {
if signed == nil {
return nil, errors.InvalidArgumentError("no signer provided")
}
// These are the possible hash functions that we'll use for the signature.
candidateHashes := []uint8{
hashToHashId(crypto.SHA256),
hashToHashId(crypto.SHA384),
hashToHashId(crypto.SHA512),
hashToHashId(crypto.SHA1),
hashToHashId(crypto.RIPEMD160),
}
defaultHashes := candidateHashes[0:1]
preferredHashes := signed.PrimaryIdentity().SelfSignature.PreferredHash
if len(preferredHashes) == 0 {
preferredHashes = defaultHashes
}
candidateHashes = intersectPreferences(candidateHashes, preferredHashes)
if len(candidateHashes) == 0 {
return nil, errors.InvalidArgumentError("cannot sign because signing key shares no common algorithms with candidate hashes")
}
return writeAndSign(noOpCloser{output}, candidateHashes, signed, hints, packet.SigTypeBinary, config)
}
// signatureWriter hashes the contents of a message while passing it along to
// literalData. When closed, it closes literalData, writes a signature packet
// to encryptedData and then also closes encryptedData.
type signatureWriter struct {
encryptedData io.WriteCloser
literalData io.WriteCloser
hashType crypto.Hash
wrappedHash hash.Hash
h hash.Hash
signer *packet.PrivateKey
sigType packet.SignatureType
config *packet.Config
metadata *packet.LiteralData // V5 signatures protect document metadata
}
func (s signatureWriter) Write(data []byte) (int, error) {
s.wrappedHash.Write(data)
switch s.sigType {
case packet.SigTypeBinary:
return s.literalData.Write(data)
case packet.SigTypeText:
flag := 0
return writeCanonical(s.literalData, data, &flag)
}
return 0, errors.UnsupportedError("unsupported signature type: " + strconv.Itoa(int(s.sigType)))
}
func (s signatureWriter) Close() error {
sig := &packet.Signature{
Version: s.signer.Version,
SigType: s.sigType,
PubKeyAlgo: s.signer.PubKeyAlgo,
Hash: s.hashType,
CreationTime: s.config.Now(),
IssuerKeyId: &s.signer.KeyId,
Metadata: s.metadata,
}
if err := sig.Sign(s.h, s.signer, s.config); err != nil {
return err
}
if err := s.literalData.Close(); err != nil {
return err
}
if err := sig.Serialize(s.encryptedData); err != nil {
return err
}
return s.encryptedData.Close()
}
// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
// TODO: we have two of these in OpenPGP packages alone. This probably needs
// to be promoted somewhere more common.
type noOpCloser struct {
w io.Writer
}
func (c noOpCloser) Write(data []byte) (n int, err error) {
return c.w.Write(data)
}
func (c noOpCloser) Close() error {
return nil
}
func handleCompression(compressed io.WriteCloser, candidateCompression []uint8, config *packet.Config) (data io.WriteCloser, err error) {
data = compressed
confAlgo := config.Compression()
if confAlgo == packet.CompressionNone {
return
}
finalAlgo := packet.CompressionNone
// if compression specified by config available we will use it
for _, c := range candidateCompression {
if uint8(confAlgo) == c {
finalAlgo = confAlgo
break
}
}
if finalAlgo != packet.CompressionNone {
var compConfig *packet.CompressionConfig
if config != nil {
compConfig = config.CompressionConfig
}
data, err = packet.SerializeCompressed(compressed, finalAlgo, compConfig)
if err != nil {
return
}
}
return data, nil
}