diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/openpgp/packet')
18 files changed, 4478 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/compressed.go b/vendor/golang.org/x/crypto/openpgp/packet/compressed.go new file mode 100644 index 000000000..e8f0b5caa --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/compressed.go @@ -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" + "golang.org/x/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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/config.go b/vendor/golang.org/x/crypto/openpgp/packet/config.go new file mode 100644 index 000000000..c76eecc96 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/config.go @@ -0,0 +1,91 @@ +// 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" + "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 +} + +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() +} + +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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go b/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go new file mode 100644 index 000000000..266840d05 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go @@ -0,0 +1,199 @@ +// 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/rsa" + "encoding/binary" + "io" + "math/big" + "strconv" + + "golang.org/x/crypto/openpgp/elgamal" + "golang.org/x/crypto/openpgp/errors" +) + +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 parsedMPI +} + +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.bytes, e.encryptedMPI1.bitLength, err = readMPI(r) + case PubKeyAlgoElGamal: + e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r) + if err != nil { + return + } + e.encryptedMPI2.bytes, e.encryptedMPI2.bitLength, err = readMPI(r) + } + _, 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 { + 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: + b, err = rsa.DecryptPKCS1v15(config.Random(), priv.PrivateKey.(*rsa.PrivateKey), e.encryptedMPI1.bytes) + 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) + default: + err = errors.InvalidArgumentError("cannot decrypted 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 = 2 + len(e.encryptedMPI1.bytes) + case PubKeyAlgoElGamal: + mpiLen = 2 + len(e.encryptedMPI1.bytes) + 2 + len(e.encryptedMPI2.bytes) + default: + return errors.InvalidArgumentError("don't know how to serialize encrypted key type " + strconv.Itoa(int(e.Algo))) + } + + serializeHeader(w, packetTypeEncryptedKey, 1 /* version */ +8 /* key id */ +1 /* algo */ +mpiLen) + + w.Write([]byte{encryptedKeyVersion}) + binary.Write(w, binary.BigEndian, e.KeyId) + w.Write([]byte{byte(e.Algo)}) + + switch e.Algo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly: + writeMPIs(w, e.encryptedMPI1) + case PubKeyAlgoElGamal: + writeMPIs(w, e.encryptedMPI1, e.encryptedMPI2) + default: + panic("internal error") + } + + return nil +} + +// 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 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()) + } + + packetLen := 10 /* header length */ + 2 /* mpi size */ + len(cipherText) + + err = serializeHeader(w, packetTypeEncryptedKey, packetLen) + if err != nil { + return err + } + _, err = w.Write(header[:]) + if err != nil { + return err + } + return writeMPI(w, 8*uint16(len(cipherText)), cipherText) +} + +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 + } + err = writeBig(w, c1) + if err != nil { + return err + } + return writeBig(w, c2) +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/literal.go b/vendor/golang.org/x/crypto/openpgp/packet/literal.go new file mode 100644 index 000000000..1a9ec6e51 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/literal.go @@ -0,0 +1,89 @@ +// 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 { + 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.IsBinary = buf[0] == '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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go b/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go new file mode 100644 index 000000000..ce2a33a54 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go @@ -0,0 +1,143 @@ +// 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. If an incorrect key is detected then nil is returned. 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 prefixCopy[blockSize-2] != prefixCopy[blockSize] || + prefixCopy[blockSize-1] != prefixCopy[blockSize+1] { + return nil + } + + 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++ + } +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go b/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go new file mode 100644 index 000000000..171350339 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go @@ -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" + "golang.org/x/crypto/openpgp/errors" + "golang.org/x/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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/opaque.go b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go new file mode 100644 index 000000000..456d807f2 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go @@ -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" + + "golang.org/x/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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/packet.go b/vendor/golang.org/x/crypto/openpgp/packet/packet.go new file mode 100644 index 000000000..e2bde1111 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/packet.go @@ -0,0 +1,539 @@ +// 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 "golang.org/x/crypto/openpgp/packet" + +import ( + "bufio" + "crypto/aes" + "crypto/cipher" + "crypto/des" + "golang.org/x/crypto/cast5" + "golang.org/x/crypto/openpgp/errors" + "io" + "math/big" +) + +// 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 + lengthByte [1]byte +} + +func (w *partialLengthWriter) Write(p []byte) (n int, err error) { + for len(p) > 0 { + for power := uint(14); power < 32; power-- { + l := 1 << power + if len(p) >= 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(p[:l]) + n += m + if err != nil { + return + } + p = p[l:] + break + } + } + } + return +} + +func (w *partialLengthWriter) Close() error { + w.lengthByte[0] = 0 + _, err := w.w.Write(w.lengthByte[:]) + 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) { + var buf [6]byte + var n int + + buf[0] = 0x80 | 0x40 | byte(ptype) + if length < 192 { + buf[1] = byte(length) + n = 2 + } else if length < 8384 { + length -= 192 + buf[1] = 192 + byte(length>>8) + buf[2] = byte(length) + n = 3 + } else { + buf[1] = 255 + buf[2] = byte(length >> 24) + buf[3] = byte(length >> 16) + buf[4] = byte(length >> 8) + buf[5] = byte(length) + n = 6 + } + + _, 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) { + var buf [1]byte + buf[0] = 0x80 | 0x40 | byte(ptype) + _, err = w.Write(buf[:]) + 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 + } + } + + panic("unreachable") +} + +// 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 +) + +// peekVersion detects the version of a public key packet about to +// be read. A bufio.Reader at the original position of the io.Reader +// is returned. +func peekVersion(r io.Reader) (bufr *bufio.Reader, ver byte, err error) { + bufr = bufio.NewReader(r) + var verBuf []byte + if verBuf, err = bufr.Peek(1); err != nil { + return + } + ver = verBuf[0] + return +} + +// 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: + var version byte + // Detect signature version + if contents, version, err = peekVersion(contents); err != nil { + return + } + if version < 4 { + p = new(SignatureV3) + } else { + 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: + var version byte + if contents, version, err = peekVersion(contents); err != nil { + return + } + isSubkey := tag == packetTypePublicSubkey + if version < 4 { + p = &PublicKeyV3{IsSubkey: isSubkey} + } else { + p = &PublicKey{IsSubkey: isSubkey} + } + case packetTypeCompressed: + p = new(Compressed) + case packetTypeSymmetricallyEncrypted: + p = new(SymmetricallyEncrypted) + 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 + 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 = 0 + SigTypeText = 1 + 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 + PubKeyAlgoRSAEncryptOnly PublicKeyAlgorithm = 2 + PubKeyAlgoRSASignOnly PublicKeyAlgorithm = 3 + PubKeyAlgoElGamal PublicKeyAlgorithm = 16 + PubKeyAlgoDSA PublicKeyAlgorithm = 17 + // RFC 6637, Section 5. + PubKeyAlgoECDH PublicKeyAlgorithm = 18 + PubKeyAlgoECDSA PublicKeyAlgorithm = 19 +) + +// 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: + 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: + 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 uint8 + +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 { + switch cipher { + case Cipher3DES: + return 24 + case CipherCAST5: + return cast5.KeySize + case CipherAES128: + return 16 + case CipherAES192: + return 24 + case CipherAES256: + return 32 + } + return 0 +} + +// blockSize returns the block size, in bytes, of cipher. +func (cipher CipherFunction) blockSize() int { + switch cipher { + case Cipher3DES: + return des.BlockSize + case CipherCAST5: + return 8 + case CipherAES128, CipherAES192, CipherAES256: + return 16 + } + return 0 +} + +// new returns a fresh instance of the given cipher. +func (cipher CipherFunction) new(key []byte) (block cipher.Block) { + switch cipher { + case Cipher3DES: + block, _ = des.NewTripleDESCipher(key) + case CipherCAST5: + block, _ = cast5.NewCipher(key) + case CipherAES128, CipherAES192, CipherAES256: + block, _ = aes.NewCipher(key) + } + return +} + +// readMPI reads a big integer from r. The bit length returned is the bit +// length that was specified in r. This is preserved so that the integer can be +// reserialized exactly. +func readMPI(r io.Reader) (mpi []byte, bitLength uint16, err error) { + var buf [2]byte + _, err = readFull(r, buf[0:]) + if err != nil { + return + } + bitLength = uint16(buf[0])<<8 | uint16(buf[1]) + numBytes := (int(bitLength) + 7) / 8 + mpi = make([]byte, numBytes) + _, err = readFull(r, mpi) + return +} + +// mpiLength returns the length of the given *big.Int when serialized as an +// MPI. +func mpiLength(n *big.Int) (mpiLengthInBytes int) { + mpiLengthInBytes = 2 /* MPI length */ + mpiLengthInBytes += (n.BitLen() + 7) / 8 + return +} + +// writeMPI serializes a big integer to w. +func writeMPI(w io.Writer, bitLength uint16, mpiBytes []byte) (err error) { + _, err = w.Write([]byte{byte(bitLength >> 8), byte(bitLength)}) + if err == nil { + _, err = w.Write(mpiBytes) + } + return +} + +// writeBig serializes a *big.Int to w. +func writeBig(w io.Writer, i *big.Int) error { + return writeMPI(w, uint16(i.BitLen()), i.Bytes()) +} + +// 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 +) diff --git a/vendor/golang.org/x/crypto/openpgp/packet/private_key.go b/vendor/golang.org/x/crypto/openpgp/packet/private_key.go new file mode 100644 index 000000000..34734cc63 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/private_key.go @@ -0,0 +1,380 @@ +// 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/rsa" + "crypto/sha1" + "io" + "io/ioutil" + "math/big" + "strconv" + "time" + + "golang.org/x/crypto/openpgp/elgamal" + "golang.org/x/crypto/openpgp/errors" + "golang.org/x/crypto/openpgp/s2k" +) + +// 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) + PrivateKey interface{} // An *{rsa|dsa|ecdsa}.PrivateKey or a crypto.Signer. + sha1Checksum bool + iv []byte +} + +func NewRSAPrivateKey(currentTime time.Time, priv *rsa.PrivateKey) *PrivateKey { + pk := new(PrivateKey) + pk.PublicKey = *NewRSAPublicKey(currentTime, &priv.PublicKey) + pk.PrivateKey = priv + return pk +} + +func NewDSAPrivateKey(currentTime time.Time, priv *dsa.PrivateKey) *PrivateKey { + pk := new(PrivateKey) + pk.PublicKey = *NewDSAPublicKey(currentTime, &priv.PublicKey) + pk.PrivateKey = priv + return pk +} + +func NewElGamalPrivateKey(currentTime time.Time, priv *elgamal.PrivateKey) *PrivateKey { + pk := new(PrivateKey) + pk.PublicKey = *NewElGamalPublicKey(currentTime, &priv.PublicKey) + pk.PrivateKey = priv + return pk +} + +func NewECDSAPrivateKey(currentTime time.Time, priv *ecdsa.PrivateKey) *PrivateKey { + pk := new(PrivateKey) + pk.PublicKey = *NewECDSAPublicKey(currentTime, &priv.PublicKey) + pk.PrivateKey = priv + return pk +} + +// NewSignerPrivateKey creates a sign-only PrivateKey from a crypto.Signer that +// implements RSA or ECDSA. +func NewSignerPrivateKey(currentTime time.Time, signer crypto.Signer) *PrivateKey { + pk := new(PrivateKey) + switch pubkey := signer.Public().(type) { + case rsa.PublicKey: + pk.PublicKey = *NewRSAPublicKey(currentTime, &pubkey) + pk.PubKeyAlgo = PubKeyAlgoRSASignOnly + case ecdsa.PublicKey: + pk.PublicKey = *NewECDSAPublicKey(currentTime, &pubkey) + default: + panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey") + } + pk.PrivateKey = signer + return pk +} + +func (pk *PrivateKey) parse(r io.Reader) (err error) { + err = (&pk.PublicKey).parse(r) + if err != nil { + return + } + var buf [1]byte + _, err = readFull(r, buf[:]) + if err != nil { + return + } + + s2kType := buf[0] + + switch s2kType { + case 0: + pk.s2k = nil + pk.Encrypted = false + case 254, 255: + _, err = readFull(r, buf[:]) + if err != nil { + return + } + pk.cipher = CipherFunction(buf[0]) + pk.Encrypted = true + pk.s2k, err = s2k.Parse(r) + if err != nil { + return + } + if s2kType == 254 { + 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 + } + } + + pk.encryptedData, err = ioutil.ReadAll(r) + if err != nil { + return + } + + if !pk.Encrypted { + return pk.parsePrivateKey(pk.encryptedData) + } + + return +} + +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) { + // TODO(agl): support encrypted private keys + buf := bytes.NewBuffer(nil) + err = pk.PublicKey.serializeWithoutHeaders(buf) + if err != nil { + return + } + buf.WriteByte(0 /* no encryption */) + + privateKeyBuf := bytes.NewBuffer(nil) + + switch priv := pk.PrivateKey.(type) { + case *rsa.PrivateKey: + err = serializeRSAPrivateKey(privateKeyBuf, priv) + case *dsa.PrivateKey: + err = serializeDSAPrivateKey(privateKeyBuf, priv) + case *elgamal.PrivateKey: + err = serializeElGamalPrivateKey(privateKeyBuf, priv) + case *ecdsa.PrivateKey: + err = serializeECDSAPrivateKey(privateKeyBuf, priv) + default: + err = errors.InvalidArgumentError("unknown private key type") + } + if err != nil { + return + } + + ptype := packetTypePrivateKey + contents := buf.Bytes() + privateKeyBytes := privateKeyBuf.Bytes() + if pk.IsSubkey { + ptype = packetTypePrivateSubkey + } + err = serializeHeader(w, ptype, len(contents)+len(privateKeyBytes)+2) + if err != nil { + return + } + _, err = w.Write(contents) + if err != nil { + return + } + _, err = w.Write(privateKeyBytes) + if err != nil { + return + } + + checksum := mod64kHash(privateKeyBytes) + var checksumBytes [2]byte + checksumBytes[0] = byte(checksum >> 8) + checksumBytes[1] = byte(checksum) + _, err = w.Write(checksumBytes[:]) + + return +} + +func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error { + err := writeBig(w, priv.D) + if err != nil { + return err + } + err = writeBig(w, priv.Primes[1]) + if err != nil { + return err + } + err = writeBig(w, priv.Primes[0]) + if err != nil { + return err + } + return writeBig(w, priv.Precomputed.Qinv) +} + +func serializeDSAPrivateKey(w io.Writer, priv *dsa.PrivateKey) error { + return writeBig(w, priv.X) +} + +func serializeElGamalPrivateKey(w io.Writer, priv *elgamal.PrivateKey) error { + return writeBig(w, priv.X) +} + +func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error { + return writeBig(w, priv.D) +} + +// Decrypt decrypts an encrypted private key using a passphrase. +func (pk *PrivateKey) Decrypt(passphrase []byte) error { + 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] + } + + return pk.parsePrivateKey(data) +} + +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) + } + 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, _, err := readMPI(buf) + if err != nil { + return + } + p, _, err := readMPI(buf) + if err != nil { + return + } + q, _, err := readMPI(buf) + if err != nil { + return + } + + rsaPriv.D = new(big.Int).SetBytes(d) + rsaPriv.Primes = make([]*big.Int, 2) + rsaPriv.Primes[0] = new(big.Int).SetBytes(p) + rsaPriv.Primes[1] = new(big.Int).SetBytes(q) + if err := rsaPriv.Validate(); err != nil { + return err + } + rsaPriv.Precompute() + pk.PrivateKey = rsaPriv + pk.Encrypted = false + pk.encryptedData = nil + + 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, _, err := readMPI(buf) + if err != nil { + return + } + + dsaPriv.X = new(big.Int).SetBytes(x) + pk.PrivateKey = dsaPriv + pk.Encrypted = false + pk.encryptedData = nil + + 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, _, err := readMPI(buf) + if err != nil { + return + } + + priv.X = new(big.Int).SetBytes(x) + pk.PrivateKey = priv + pk.Encrypted = false + pk.encryptedData = nil + + return nil +} + +func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) { + ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey) + + buf := bytes.NewBuffer(data) + d, _, err := readMPI(buf) + if err != nil { + return + } + + pk.PrivateKey = &ecdsa.PrivateKey{ + PublicKey: *ecdsaPub, + D: new(big.Int).SetBytes(d), + } + pk.Encrypted = false + pk.encryptedData = nil + + return nil +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/public_key.go b/vendor/golang.org/x/crypto/openpgp/packet/public_key.go new file mode 100644 index 000000000..c769933ce --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/public_key.go @@ -0,0 +1,750 @@ +// 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" + "crypto/elliptic" + "crypto/rsa" + "crypto/sha1" + _ "crypto/sha256" + _ "crypto/sha512" + "encoding/binary" + "fmt" + "hash" + "io" + "math/big" + "strconv" + "time" + + "golang.org/x/crypto/openpgp/elgamal" + "golang.org/x/crypto/openpgp/errors" +) + +var ( + // NIST curve P-256 + oidCurveP256 []byte = []byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07} + // NIST curve P-384 + oidCurveP384 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x22} + // NIST curve P-521 + oidCurveP521 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x23} +) + +const maxOIDLength = 8 + +// ecdsaKey stores the algorithm-specific fields for ECDSA keys. +// as defined in RFC 6637, Section 9. +type ecdsaKey struct { + // oid contains the OID byte sequence identifying the elliptic curve used + oid []byte + // p contains the elliptic curve point that represents the public key + p parsedMPI +} + +// parseOID reads the OID for the curve as defined in RFC 6637, Section 9. +func parseOID(r io.Reader) (oid []byte, err error) { + buf := make([]byte, maxOIDLength) + if _, err = readFull(r, buf[:1]); err != nil { + return + } + oidLen := buf[0] + if int(oidLen) > len(buf) { + err = errors.UnsupportedError("invalid oid length: " + strconv.Itoa(int(oidLen))) + return + } + oid = buf[:oidLen] + _, err = readFull(r, oid) + return +} + +func (f *ecdsaKey) parse(r io.Reader) (err error) { + if f.oid, err = parseOID(r); err != nil { + return err + } + f.p.bytes, f.p.bitLength, err = readMPI(r) + return +} + +func (f *ecdsaKey) serialize(w io.Writer) (err error) { + buf := make([]byte, maxOIDLength+1) + buf[0] = byte(len(f.oid)) + copy(buf[1:], f.oid) + if _, err = w.Write(buf[:len(f.oid)+1]); err != nil { + return + } + return writeMPIs(w, f.p) +} + +func (f *ecdsaKey) newECDSA() (*ecdsa.PublicKey, error) { + var c elliptic.Curve + if bytes.Equal(f.oid, oidCurveP256) { + c = elliptic.P256() + } else if bytes.Equal(f.oid, oidCurveP384) { + c = elliptic.P384() + } else if bytes.Equal(f.oid, oidCurveP521) { + c = elliptic.P521() + } else { + return nil, errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", f.oid)) + } + x, y := elliptic.Unmarshal(c, f.p.bytes) + if x == nil { + return nil, errors.UnsupportedError("failed to parse EC point") + } + return &ecdsa.PublicKey{Curve: c, X: x, Y: y}, nil +} + +func (f *ecdsaKey) byteLen() int { + return 1 + len(f.oid) + 2 + len(f.p.bytes) +} + +type kdfHashFunction byte +type kdfAlgorithm byte + +// ecdhKdf stores key derivation function parameters +// used for ECDH encryption. See RFC 6637, Section 9. +type ecdhKdf struct { + KdfHash kdfHashFunction + KdfAlgo kdfAlgorithm +} + +func (f *ecdhKdf) parse(r io.Reader) (err error) { + buf := make([]byte, 1) + if _, err = readFull(r, buf); err != nil { + return + } + kdfLen := int(buf[0]) + if kdfLen < 3 { + return errors.UnsupportedError("Unsupported ECDH KDF length: " + strconv.Itoa(kdfLen)) + } + buf = make([]byte, kdfLen) + if _, err = readFull(r, buf); err != nil { + return + } + reserved := int(buf[0]) + f.KdfHash = kdfHashFunction(buf[1]) + f.KdfAlgo = kdfAlgorithm(buf[2]) + if reserved != 0x01 { + return errors.UnsupportedError("Unsupported KDF reserved field: " + strconv.Itoa(reserved)) + } + return +} + +func (f *ecdhKdf) serialize(w io.Writer) (err error) { + buf := make([]byte, 4) + // See RFC 6637, Section 9, Algorithm-Specific Fields for ECDH keys. + buf[0] = byte(0x03) // Length of the following fields + buf[1] = byte(0x01) // Reserved for future extensions, must be 1 for now + buf[2] = byte(f.KdfHash) + buf[3] = byte(f.KdfAlgo) + _, err = w.Write(buf[:]) + return +} + +func (f *ecdhKdf) byteLen() int { + return 4 +} + +// PublicKey represents an OpenPGP public key. See RFC 4880, section 5.5.2. +type PublicKey struct { + CreationTime time.Time + PubKeyAlgo PublicKeyAlgorithm + PublicKey interface{} // *rsa.PublicKey, *dsa.PublicKey or *ecdsa.PublicKey + Fingerprint [20]byte + KeyId uint64 + IsSubkey bool + + n, e, p, q, g, y parsedMPI + + // RFC 6637 fields + ec *ecdsaKey + ecdh *ecdhKdf +} + +// signingKey provides a convenient abstraction over signature verification +// for v3 and v4 public keys. +type signingKey interface { + SerializeSignaturePrefix(io.Writer) + serializeWithoutHeaders(io.Writer) error +} + +func fromBig(n *big.Int) parsedMPI { + return parsedMPI{ + bytes: n.Bytes(), + bitLength: uint16(n.BitLen()), + } +} + +// NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey. +func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey) *PublicKey { + pk := &PublicKey{ + CreationTime: creationTime, + PubKeyAlgo: PubKeyAlgoRSA, + PublicKey: pub, + n: fromBig(pub.N), + e: fromBig(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{ + CreationTime: creationTime, + PubKeyAlgo: PubKeyAlgoDSA, + PublicKey: pub, + p: fromBig(pub.P), + q: fromBig(pub.Q), + g: fromBig(pub.G), + y: fromBig(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{ + CreationTime: creationTime, + PubKeyAlgo: PubKeyAlgoElGamal, + PublicKey: pub, + p: fromBig(pub.P), + g: fromBig(pub.G), + y: fromBig(pub.Y), + } + + pk.setFingerPrintAndKeyId() + return pk +} + +func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey { + pk := &PublicKey{ + CreationTime: creationTime, + PubKeyAlgo: PubKeyAlgoECDSA, + PublicKey: pub, + ec: new(ecdsaKey), + } + + switch pub.Curve { + case elliptic.P256(): + pk.ec.oid = oidCurveP256 + case elliptic.P384(): + pk.ec.oid = oidCurveP384 + case elliptic.P521(): + pk.ec.oid = oidCurveP521 + default: + panic("unknown elliptic curve") + } + + pk.ec.p.bytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y) + pk.ec.p.bitLength = uint16(8 * len(pk.ec.p.bytes)) + + 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 { + return errors.UnsupportedError("public key version") + } + 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: + pk.ec = new(ecdsaKey) + if err = pk.ec.parse(r); err != nil { + return err + } + pk.PublicKey, err = pk.ec.newECDSA() + case PubKeyAlgoECDH: + pk.ec = new(ecdsaKey) + if err = pk.ec.parse(r); err != nil { + return + } + pk.ecdh = new(ecdhKdf) + if err = pk.ecdh.parse(r); err != nil { + return + } + // The ECDH key is stored in an ecdsa.PublicKey for convenience. + pk.PublicKey, err = pk.ec.newECDSA() + 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 + fingerPrint := sha1.New() + pk.SerializeSignaturePrefix(fingerPrint) + pk.serializeWithoutHeaders(fingerPrint) + 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.bytes, pk.n.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.e.bytes, pk.e.bitLength, err = readMPI(r) + if 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.bytes, pk.p.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.q.bytes, pk.q.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.g.bytes, pk.g.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.y.bytes, pk.y.bitLength, err = readMPI(r) + if 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.bytes, pk.p.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.g.bytes, pk.g.bitLength, err = readMPI(r) + if err != nil { + return + } + pk.y.bytes, pk.y.bitLength, err = readMPI(r) + if 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 +} + +// 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(h io.Writer) { + var pLength uint16 + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + pLength += 2 + uint16(len(pk.n.bytes)) + pLength += 2 + uint16(len(pk.e.bytes)) + case PubKeyAlgoDSA: + pLength += 2 + uint16(len(pk.p.bytes)) + pLength += 2 + uint16(len(pk.q.bytes)) + pLength += 2 + uint16(len(pk.g.bytes)) + pLength += 2 + uint16(len(pk.y.bytes)) + case PubKeyAlgoElGamal: + pLength += 2 + uint16(len(pk.p.bytes)) + pLength += 2 + uint16(len(pk.g.bytes)) + pLength += 2 + uint16(len(pk.y.bytes)) + case PubKeyAlgoECDSA: + pLength += uint16(pk.ec.byteLen()) + case PubKeyAlgoECDH: + pLength += uint16(pk.ec.byteLen()) + pLength += uint16(pk.ecdh.byteLen()) + default: + panic("unknown public key algorithm") + } + pLength += 6 + h.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)}) + return +} + +func (pk *PublicKey) Serialize(w io.Writer) (err error) { + length := 6 // 6 byte header + + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + length += 2 + len(pk.n.bytes) + length += 2 + len(pk.e.bytes) + case PubKeyAlgoDSA: + length += 2 + len(pk.p.bytes) + length += 2 + len(pk.q.bytes) + length += 2 + len(pk.g.bytes) + length += 2 + len(pk.y.bytes) + case PubKeyAlgoElGamal: + length += 2 + len(pk.p.bytes) + length += 2 + len(pk.g.bytes) + length += 2 + len(pk.y.bytes) + case PubKeyAlgoECDSA: + length += pk.ec.byteLen() + case PubKeyAlgoECDH: + length += pk.ec.byteLen() + length += pk.ecdh.byteLen() + default: + panic("unknown public key algorithm") + } + + packetType := packetTypePublicKey + if pk.IsSubkey { + packetType = packetTypePublicSubkey + } + err = serializeHeader(w, packetType, length) + if err != nil { + return + } + return pk.serializeWithoutHeaders(w) +} + +// 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) { + var buf [6]byte + buf[0] = 4 + t := uint32(pk.CreationTime.Unix()) + buf[1] = byte(t >> 24) + buf[2] = byte(t >> 16) + buf[3] = byte(t >> 8) + buf[4] = byte(t) + buf[5] = byte(pk.PubKeyAlgo) + + _, err = w.Write(buf[:]) + if err != nil { + return + } + + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + return writeMPIs(w, pk.n, pk.e) + case PubKeyAlgoDSA: + return writeMPIs(w, pk.p, pk.q, pk.g, pk.y) + case PubKeyAlgoElGamal: + return writeMPIs(w, pk.p, pk.g, pk.y) + case PubKeyAlgoECDSA: + return pk.ec.serialize(w) + case PubKeyAlgoECDH: + if err = pk.ec.serialize(w); err != nil { + return + } + return pk.ecdh.serialize(w) + } + 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 +} + +// 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") + } + + 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, 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 + default: + return errors.SignatureError("Unsupported public key algorithm used in signature") + } + panic("unreachable") +} + +// VerifySignatureV3 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) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) { + if !pk.CanSign() { + return errors.InvalidArgumentError("public key cannot generate signatures") + } + + suffix := make([]byte, 5) + suffix[0] = byte(sig.SigType) + binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix())) + signed.Write(suffix) + 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) + if err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil { + return errors.SignatureError("RSA verification failure") + } + return + 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 + default: + panic("shouldn't happen") + } + panic("unreachable") +} + +// 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 + pk.SerializeSignaturePrefix(h) + pk.serializeWithoutHeaders(h) + signed.SerializeSignaturePrefix(h) + signed.serializeWithoutHeaders(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 + pk.SerializeSignaturePrefix(h) + pk.serializeWithoutHeaders(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) +} + +// 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) +} + +// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this +// public key, that id is the identity of pub. +func (pk *PublicKey) VerifyUserIdSignatureV3(id string, pub *PublicKey, sig *SignatureV3) (err error) { + h, err := userIdSignatureV3Hash(id, pub, sig.Hash) + if err != nil { + return err + } + return pk.VerifySignatureV3(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]) +} + +// A parsedMPI 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 parsedMPI struct { + bytes []byte + bitLength uint16 +} + +// writeMPIs is a utility function for serializing several big integers to the +// given Writer. +func writeMPIs(w io.Writer, mpis ...parsedMPI) (err error) { + for _, mpi := range mpis { + err = writeMPI(w, mpi.bitLength, mpi.bytes) + if err != nil { + return + } + } + return +} + +// 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 + default: + err = errors.InvalidArgumentError("bad public-key algorithm") + } + return +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go b/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go new file mode 100644 index 000000000..26337f5aa --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go @@ -0,0 +1,280 @@ +// 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 ( + "crypto" + "crypto/md5" + "crypto/rsa" + "encoding/binary" + "fmt" + "hash" + "io" + "math/big" + "strconv" + "time" + + "golang.org/x/crypto/openpgp/errors" +) + +// PublicKeyV3 represents older, version 3 public keys. These keys are less secure and +// should not be used for signing or encrypting. They are supported here only for +// parsing version 3 key material and validating signatures. +// See RFC 4880, section 5.5.2. +type PublicKeyV3 struct { + CreationTime time.Time + DaysToExpire uint16 + PubKeyAlgo PublicKeyAlgorithm + PublicKey *rsa.PublicKey + Fingerprint [16]byte + KeyId uint64 + IsSubkey bool + + n, e parsedMPI +} + +// newRSAPublicKeyV3 returns a PublicKey that wraps the given rsa.PublicKey. +// Included here for testing purposes only. RFC 4880, section 5.5.2: +// "an implementation MUST NOT generate a V3 key, but MAY accept it." +func newRSAPublicKeyV3(creationTime time.Time, pub *rsa.PublicKey) *PublicKeyV3 { + pk := &PublicKeyV3{ + CreationTime: creationTime, + PublicKey: pub, + n: fromBig(pub.N), + e: fromBig(big.NewInt(int64(pub.E))), + } + + pk.setFingerPrintAndKeyId() + return pk +} + +func (pk *PublicKeyV3) parse(r io.Reader) (err error) { + // RFC 4880, section 5.5.2 + var buf [8]byte + if _, err = readFull(r, buf[:]); err != nil { + return + } + if buf[0] < 2 || buf[0] > 3 { + return errors.UnsupportedError("public key version") + } + pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0) + pk.DaysToExpire = binary.BigEndian.Uint16(buf[5:7]) + pk.PubKeyAlgo = PublicKeyAlgorithm(buf[7]) + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + err = pk.parseRSA(r) + default: + err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo))) + } + if err != nil { + return + } + + pk.setFingerPrintAndKeyId() + return +} + +func (pk *PublicKeyV3) setFingerPrintAndKeyId() { + // RFC 4880, section 12.2 + fingerPrint := md5.New() + fingerPrint.Write(pk.n.bytes) + fingerPrint.Write(pk.e.bytes) + fingerPrint.Sum(pk.Fingerprint[:0]) + pk.KeyId = binary.BigEndian.Uint64(pk.n.bytes[len(pk.n.bytes)-8:]) +} + +// parseRSA parses RSA public key material from the given Reader. See RFC 4880, +// section 5.5.2. +func (pk *PublicKeyV3) parseRSA(r io.Reader) (err error) { + if pk.n.bytes, pk.n.bitLength, err = readMPI(r); err != nil { + return + } + if pk.e.bytes, pk.e.bitLength, err = readMPI(r); err != nil { + return + } + + // RFC 4880 Section 12.2 requires the low 8 bytes of the + // modulus to form the key id. + if len(pk.n.bytes) < 8 { + return errors.StructuralError("v3 public key modulus is too short") + } + if len(pk.e.bytes) > 3 { + err = errors.UnsupportedError("large public exponent") + return + } + rsa := &rsa.PublicKey{N: new(big.Int).SetBytes(pk.n.bytes)} + for i := 0; i < len(pk.e.bytes); i++ { + rsa.E <<= 8 + rsa.E |= int(pk.e.bytes[i]) + } + pk.PublicKey = rsa + return +} + +// 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 *PublicKeyV3) SerializeSignaturePrefix(w io.Writer) { + var pLength uint16 + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + pLength += 2 + uint16(len(pk.n.bytes)) + pLength += 2 + uint16(len(pk.e.bytes)) + default: + panic("unknown public key algorithm") + } + pLength += 6 + w.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)}) + return +} + +func (pk *PublicKeyV3) Serialize(w io.Writer) (err error) { + length := 8 // 8 byte header + + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + length += 2 + len(pk.n.bytes) + length += 2 + len(pk.e.bytes) + default: + panic("unknown public key algorithm") + } + + packetType := packetTypePublicKey + if pk.IsSubkey { + packetType = packetTypePublicSubkey + } + if err = serializeHeader(w, packetType, length); err != nil { + return + } + return pk.serializeWithoutHeaders(w) +} + +// serializeWithoutHeaders marshals the PublicKey to w in the form of an +// OpenPGP public key packet, not including the packet header. +func (pk *PublicKeyV3) serializeWithoutHeaders(w io.Writer) (err error) { + var buf [8]byte + // Version 3 + buf[0] = 3 + // Creation time + t := uint32(pk.CreationTime.Unix()) + buf[1] = byte(t >> 24) + buf[2] = byte(t >> 16) + buf[3] = byte(t >> 8) + buf[4] = byte(t) + // Days to expire + buf[5] = byte(pk.DaysToExpire >> 8) + buf[6] = byte(pk.DaysToExpire) + // Public key algorithm + buf[7] = byte(pk.PubKeyAlgo) + + if _, err = w.Write(buf[:]); err != nil { + return + } + + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + return writeMPIs(w, pk.n, pk.e) + } + return errors.InvalidArgumentError("bad public-key algorithm") +} + +// CanSign returns true iff this public key can generate signatures +func (pk *PublicKeyV3) CanSign() bool { + return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly +} + +// VerifySignatureV3 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 *PublicKeyV3) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) { + if !pk.CanSign() { + return errors.InvalidArgumentError("public key cannot generate signatures") + } + + suffix := make([]byte, 5) + suffix[0] = byte(sig.SigType) + binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix())) + signed.Write(suffix) + 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: + if err = rsa.VerifyPKCS1v15(pk.PublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil { + return errors.SignatureError("RSA verification failure") + } + return + default: + // V3 public keys only support RSA. + panic("shouldn't happen") + } + panic("unreachable") +} + +// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this +// public key, that id is the identity of pub. +func (pk *PublicKeyV3) VerifyUserIdSignatureV3(id string, pub *PublicKeyV3, sig *SignatureV3) (err error) { + h, err := userIdSignatureV3Hash(id, pk, sig.Hash) + if err != nil { + return err + } + return pk.VerifySignatureV3(h, sig) +} + +// VerifyKeySignatureV3 returns nil iff sig is a valid signature, made by this +// public key, of signed. +func (pk *PublicKeyV3) VerifyKeySignatureV3(signed *PublicKeyV3, sig *SignatureV3) (err error) { + h, err := keySignatureHash(pk, signed, sig.Hash) + if err != nil { + return err + } + return pk.VerifySignatureV3(h, sig) +} + +// userIdSignatureV3Hash returns a Hash of the message that needs to be signed +// to assert that pk is a valid key for id. +func userIdSignatureV3Hash(id string, pk signingKey, hfn crypto.Hash) (h hash.Hash, err error) { + if !hfn.Available() { + return nil, errors.UnsupportedError("hash function") + } + h = hfn.New() + + // RFC 4880, section 5.2.4 + pk.SerializeSignaturePrefix(h) + pk.serializeWithoutHeaders(h) + + h.Write([]byte(id)) + + return +} + +// KeyIdString returns the public key's fingerprint in capital hex +// (e.g. "6C7EE1B8621CC013"). +func (pk *PublicKeyV3) KeyIdString() string { + return fmt.Sprintf("%X", pk.KeyId) +} + +// KeyIdShortString returns the short form of public key's fingerprint +// in capital hex, as shown by gpg --list-keys (e.g. "621CC013"). +func (pk *PublicKeyV3) KeyIdShortString() string { + return fmt.Sprintf("%X", pk.KeyId&0xFFFFFFFF) +} + +// BitLength returns the bit length for the given public key. +func (pk *PublicKeyV3) BitLength() (bitLength uint16, err error) { + switch pk.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly: + bitLength = pk.n.bitLength + default: + err = errors.InvalidArgumentError("bad public-key algorithm") + } + return +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/reader.go b/vendor/golang.org/x/crypto/openpgp/packet/reader.go new file mode 100644 index 000000000..34bc7c613 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/reader.go @@ -0,0 +1,76 @@ +// 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 ( + "golang.org/x/crypto/openpgp/errors" + "io" +) + +// 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 + } + 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}, + } +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/signature.go b/vendor/golang.org/x/crypto/openpgp/packet/signature.go new file mode 100644 index 000000000..6ce0cbedb --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/signature.go @@ -0,0 +1,731 @@ +// 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" + + "golang.org/x/crypto/openpgp/errors" + "golang.org/x/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 { + 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 + CreationTime time.Time + + RSASignature parsedMPI + DSASigR, DSASigS parsedMPI + ECDSASigR, ECDSASigS parsedMPI + + // 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 + IssuerKeyId *uint64 + 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 + + // MDC is set if this signature has a feature packet that indicates + // support for MDC subpackets. + MDC 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 { + err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0]))) + return + } + + _, 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: + 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]) + l := 6 + hashedSubpacketsLength + sig.HashSuffix = make([]byte, l+6) + sig.HashSuffix[0] = 4 + copy(sig.HashSuffix[1:], buf[:5]) + hashedSubpackets := sig.HashSuffix[6:l] + _, err = readFull(r, hashedSubpackets) + if err != nil { + return + } + // See RFC 4880, section 5.2.4 + trailer := sig.HashSuffix[l:] + trailer[0] = 4 + trailer[1] = 0xff + trailer[2] = uint8(l >> 24) + trailer[3] = uint8(l >> 16) + trailer[4] = uint8(l >> 8) + trailer[5] = uint8(l) + + 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.bytes, sig.RSASignature.bitLength, err = readMPI(r) + case PubKeyAlgoDSA: + sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r) + if err == nil { + sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r) + } + case PubKeyAlgoECDSA: + sig.ECDSASigR.bytes, sig.ECDSASigR.bitLength, err = readMPI(r) + if err == nil { + sig.ECDSASigS.bytes, sig.ECDSASigS.bitLength, err = readMPI(r) + } + 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 +) + +// 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: + // 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. In practice, the subpacket is used exclusively to + // indicate support for MDC-protected encryption. + sig.MDC = len(subpacket) >= 1 && subpacket[0]&1 == 1 + 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))) + } + 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 +} + +// 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 +} + +// KeyExpired returns whether sig is a self-signature of a key that has +// expired. +func (sig *Signature) KeyExpired(currentTime time.Time) bool { + if sig.KeyLifetimeSecs == nil { + return false + } + expiry := sig.CreationTime.Add(time.Duration(*sig.KeyLifetimeSecs) * time.Second) + return currentTime.After(expiry) +} + +// buildHashSuffix constructs the HashSuffix member of sig in preparation for signing. +func (sig *Signature) buildHashSuffix() (err error) { + hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true) + + var ok bool + l := 6 + hashedSubpacketsLen + sig.HashSuffix = make([]byte, l+6) + sig.HashSuffix[0] = 4 + sig.HashSuffix[1] = uint8(sig.SigType) + sig.HashSuffix[2] = uint8(sig.PubKeyAlgo) + sig.HashSuffix[3], ok = s2k.HashToHashId(sig.Hash) + if !ok { + sig.HashSuffix = nil + return errors.InvalidArgumentError("hash cannot be represented in OpenPGP: " + strconv.Itoa(int(sig.Hash))) + } + sig.HashSuffix[4] = byte(hashedSubpacketsLen >> 8) + sig.HashSuffix[5] = byte(hashedSubpacketsLen) + serializeSubpackets(sig.HashSuffix[6:l], sig.outSubpackets, true) + trailer := sig.HashSuffix[l:] + trailer[0] = 4 + trailer[1] = 0xff + trailer[2] = byte(l >> 24) + trailer[3] = byte(l >> 16) + trailer[4] = byte(l >> 8) + trailer[5] = byte(l) + return +} + +func (sig *Signature) signPrepareHash(h hash.Hash) (digest []byte, err error) { + err = sig.buildHashSuffix() + if err != nil { + return + } + + 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) { + sig.outSubpackets = sig.buildSubpackets() + digest, err := sig.signPrepareHash(h) + if err != nil { + return + } + + switch priv.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: + // supports both *rsa.PrivateKey and crypto.Signer + sig.RSASignature.bytes, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash) + sig.RSASignature.bitLength = uint16(8 * len(sig.RSASignature.bytes)) + 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.bytes = r.Bytes() + sig.DSASigR.bitLength = uint16(8 * len(sig.DSASigR.bytes)) + sig.DSASigS.bytes = s.Bytes() + sig.DSASigS.bitLength = uint16(8 * len(sig.DSASigS.bytes)) + } + 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, nil) + if err == nil { + r, s, err = unwrapECDSASig(b) + } + } + if err == nil { + sig.ECDSASigR = fromBig(r) + sig.ECDSASigS = fromBig(s) + } + 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 { + h, err := userIdSignatureHash(id, pub, sig.Hash) + if err != nil { + return err + } + return sig.Sign(h, priv, 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 { + h, err := keySignatureHash(&priv.PublicKey, 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.bytes == nil && sig.DSASigR.bytes == nil && sig.ECDSASigR.bytes == nil { + return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize") + } + + sigLength := 0 + switch sig.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: + sigLength = 2 + len(sig.RSASignature.bytes) + case PubKeyAlgoDSA: + sigLength = 2 + len(sig.DSASigR.bytes) + sigLength += 2 + len(sig.DSASigS.bytes) + case PubKeyAlgoECDSA: + sigLength = 2 + len(sig.ECDSASigR.bytes) + sigLength += 2 + len(sig.ECDSASigS.bytes) + 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 + err = serializeHeader(w, packetTypeSignature, length) + if err != nil { + return + } + + _, err = w.Write(sig.HashSuffix[:len(sig.HashSuffix)-6]) + if err != nil { + return + } + + 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 = writeMPIs(w, sig.RSASignature) + case PubKeyAlgoDSA: + err = writeMPIs(w, sig.DSASigR, sig.DSASigS) + case PubKeyAlgoECDSA: + err = writeMPIs(w, sig.ECDSASigR, sig.ECDSASigS) + 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() (subpackets []outputSubpacket) { + creationTime := make([]byte, 4) + binary.BigEndian.PutUint32(creationTime, uint32(sig.CreationTime.Unix())) + subpackets = append(subpackets, outputSubpacket{true, creationTimeSubpacket, false, creationTime}) + + if sig.IssuerKeyId != nil { + keyId := make([]byte, 8) + binary.BigEndian.PutUint64(keyId, *sig.IssuerKeyId) + subpackets = append(subpackets, outputSubpacket{true, issuerSubpacket, false, keyId}) + } + + 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 + + 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}) + } + + return +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go b/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go new file mode 100644 index 000000000..6edff8893 --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go @@ -0,0 +1,146 @@ +// 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 ( + "crypto" + "encoding/binary" + "fmt" + "io" + "strconv" + "time" + + "golang.org/x/crypto/openpgp/errors" + "golang.org/x/crypto/openpgp/s2k" +) + +// SignatureV3 represents older version 3 signatures. These signatures are less secure +// than version 4 and should not be used to create new signatures. They are included +// here for backwards compatibility to read and validate with older key material. +// See RFC 4880, section 5.2.2. +type SignatureV3 struct { + SigType SignatureType + CreationTime time.Time + IssuerKeyId uint64 + PubKeyAlgo PublicKeyAlgorithm + Hash crypto.Hash + HashTag [2]byte + + RSASignature parsedMPI + DSASigR, DSASigS parsedMPI +} + +func (sig *SignatureV3) parse(r io.Reader) (err error) { + // RFC 4880, section 5.2.2 + var buf [8]byte + if _, err = readFull(r, buf[:1]); err != nil { + return + } + if buf[0] < 2 || buf[0] > 3 { + err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0]))) + return + } + if _, err = readFull(r, buf[:1]); err != nil { + return + } + if buf[0] != 5 { + err = errors.UnsupportedError( + "invalid hashed material length " + strconv.Itoa(int(buf[0]))) + return + } + + // Read hashed material: signature type + creation time + if _, err = readFull(r, buf[:5]); err != nil { + return + } + sig.SigType = SignatureType(buf[0]) + t := binary.BigEndian.Uint32(buf[1:5]) + sig.CreationTime = time.Unix(int64(t), 0) + + // Eight-octet Key ID of signer. + if _, err = readFull(r, buf[:8]); err != nil { + return + } + sig.IssuerKeyId = binary.BigEndian.Uint64(buf[:]) + + // Public-key and hash algorithm + if _, err = readFull(r, buf[:2]); err != nil { + return + } + sig.PubKeyAlgo = PublicKeyAlgorithm(buf[0]) + switch sig.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA: + default: + err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo))) + return + } + var ok bool + if sig.Hash, ok = s2k.HashIdToHash(buf[1]); !ok { + return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2]))) + } + + // Two-octet field holding left 16 bits of signed hash value. + if _, err = readFull(r, sig.HashTag[:2]); err != nil { + return + } + + switch sig.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: + sig.RSASignature.bytes, sig.RSASignature.bitLength, err = readMPI(r) + case PubKeyAlgoDSA: + if sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r); err != nil { + return + } + sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r) + default: + panic("unreachable") + } + return +} + +// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been +// called first. +func (sig *SignatureV3) Serialize(w io.Writer) (err error) { + buf := make([]byte, 8) + + // Write the sig type and creation time + buf[0] = byte(sig.SigType) + binary.BigEndian.PutUint32(buf[1:5], uint32(sig.CreationTime.Unix())) + if _, err = w.Write(buf[:5]); err != nil { + return + } + + // Write the issuer long key ID + binary.BigEndian.PutUint64(buf[:8], sig.IssuerKeyId) + if _, err = w.Write(buf[:8]); err != nil { + return + } + + // Write public key algorithm, hash ID, and hash value + buf[0] = byte(sig.PubKeyAlgo) + hashId, ok := s2k.HashToHashId(sig.Hash) + if !ok { + return errors.UnsupportedError(fmt.Sprintf("hash function %v", sig.Hash)) + } + buf[1] = hashId + copy(buf[2:4], sig.HashTag[:]) + if _, err = w.Write(buf[:4]); err != nil { + return + } + + if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil { + return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize") + } + + switch sig.PubKeyAlgo { + case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly: + err = writeMPIs(w, sig.RSASignature) + case PubKeyAlgoDSA: + err = writeMPIs(w, sig.DSASigR, sig.DSASigS) + default: + panic("impossible") + } + return +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go b/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go new file mode 100644 index 000000000..4b1105b6f --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go @@ -0,0 +1,155 @@ +// 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" + + "golang.org/x/crypto/openpgp/errors" + "golang.org/x/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 { + CipherFunc CipherFunction + s2k func(out, in []byte) + encryptedKey []byte +} + +const symmetricKeyEncryptedVersion = 4 + +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 + } + if buf[0] != symmetricKeyEncryptedVersion { + return errors.UnsupportedError("SymmetricKeyEncrypted version") + } + ske.CipherFunc = CipherFunction(buf[1]) + + if ske.CipherFunc.KeySize() == 0 { + return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(buf[1]))) + } + + var err error + ske.s2k, err = s2k.Parse(r) + if err != nil { + return err + } + + 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 + } + + // 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 l := len(plaintextKey); l == 0 || l%cipherFunc.blockSize() != 0 { + return nil, cipherFunc, errors.StructuralError("length of decrypted key not a multiple of block size") + } + + return plaintextKey, cipherFunc, 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. +// 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))) + } + + 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() + + packetLength := 2 /* header */ + len(s2kBytes) + 1 /* cipher type */ + keySize + err = serializeHeader(w, packetTypeSymmetricKeyEncrypted, packetLength) + if err != nil { + return + } + + var buf [2]byte + buf[0] = symmetricKeyEncryptedVersion + buf[1] = byte(cipherFunc) + _, err = w.Write(buf[:]) + if err != nil { + return + } + _, err = w.Write(s2kBytes) + if err != nil { + return + } + + sessionKey := make([]byte, keySize) + _, err = io.ReadFull(config.Random(), sessionKey) + if err != nil { + return + } + 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 + } + + key = sessionKey + return +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go b/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go new file mode 100644 index 000000000..6126030eb --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go @@ -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" + "golang.org/x/crypto/openpgp/errors" + "hash" + "io" + "strconv" +) + +// 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 can, with high probability, be detected +// immediately and this will result in a KeyIncorrect error being returned. +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) + if s == nil { + return nil, errors.ErrKeyIncorrect + } + + 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.SignatureError("error during reading") + } + + 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.SignatureError("error during reading") + } + } + + if ser.trailer[0] != mdcPacketTagByte || ser.trailer[1] != sha1.Size { + return errors.SignatureError("MDC packet not found") + } + ser.h.Write(ser.trailer[:2]) + + final := ser.h.Sum(nil) + if subtle.ConstantTimeCompare(final, ser.trailer[2:]) != 1 { + return errors.SignatureError("hash mismatch") + } + 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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go b/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go new file mode 100644 index 000000000..96a2b382a --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go @@ -0,0 +1,91 @@ +// 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 { + sp.Serialize(&buf) + } + 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 +// 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 +} diff --git a/vendor/golang.org/x/crypto/openpgp/packet/userid.go b/vendor/golang.org/x/crypto/openpgp/packet/userid.go new file mode 100644 index 000000000..d6bea7d4a --- /dev/null +++ b/vendor/golang.org/x/crypto/openpgp/packet/userid.go @@ -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 +} |