Bump go-git

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/aead_config.go

@@ -0,0 +1,67 @@
+// Copyright (C) 2019 ProtonTech AG
+
+package packet
+
+import "math/bits"
+
+// CipherSuite contains a combination of Cipher and Mode
+type CipherSuite struct {
+	// The cipher function
+	Cipher CipherFunction
+	// The AEAD mode of operation.
+	Mode AEADMode
+}
+
+// AEADConfig collects a number of AEAD parameters along with sensible defaults.
+// A nil AEADConfig is valid and results in all default values.
+type AEADConfig struct {
+	// The AEAD mode of operation.
+	DefaultMode AEADMode
+	// Amount of octets in each chunk of data
+	ChunkSize uint64
+}
+
+// Mode returns the AEAD mode of operation.
+func (conf *AEADConfig) Mode() AEADMode {
+	// If no preference is specified, OCB is used (which is mandatory to implement).
+	if conf == nil || conf.DefaultMode == 0 {
+		return AEADModeOCB
+	}
+
+	mode := conf.DefaultMode
+	if mode != AEADModeEAX && mode != AEADModeOCB && mode != AEADModeGCM {
+		panic("AEAD mode unsupported")
+	}
+	return mode
+}
+
+// ChunkSizeByte returns the byte indicating the chunk size. The effective
+// chunk size is computed with the formula uint64(1) << (chunkSizeByte + 6)
+// limit to 16 = 4 MiB
+// https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#section-5.13.2
+func (conf *AEADConfig) ChunkSizeByte() byte {
+	if conf == nil || conf.ChunkSize == 0 {
+		return 12 // 1 << (12 + 6) == 262144 bytes
+	}
+
+	chunkSize := conf.ChunkSize
+	exponent := bits.Len64(chunkSize) - 1
+	switch {
+	case exponent < 6:
+		exponent = 6
+	case exponent > 16:
+		exponent = 16
+	}
+
+	return byte(exponent - 6)
+}
+
+// decodeAEADChunkSize returns the effective chunk size. In 32-bit systems, the
+// maximum returned value is 1 << 30.
+func decodeAEADChunkSize(c byte) int {
+	size := uint64(1 << (c + 6))
+	if size != uint64(int(size)) {
+		return 1 << 30
+	}
+	return int(size)
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/aead_crypter.go

@@ -0,0 +1,250 @@
+// Copyright (C) 2019 ProtonTech AG
+
+package packet
+
+import (
+	"crypto/cipher"
+	"encoding/binary"
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+// aeadCrypter is an AEAD opener/sealer, its configuration, and data for en/decryption.
+type aeadCrypter struct {
+	aead           cipher.AEAD
+	chunkSize      int
+	nonce          []byte
+	associatedData []byte       // Chunk-independent associated data
+	chunkIndex     []byte       // Chunk counter
+	packetTag      packetType   // SEIP packet (v2) or AEAD Encrypted Data packet
+	bytesProcessed int          // Amount of plaintext bytes encrypted/decrypted
+}
+
+// computeNonce takes the incremental index and computes an eXclusive OR with
+// the least significant 8 bytes of the receivers' initial nonce (see sec.
+// 5.16.1 and 5.16.2). It returns the resulting nonce.
+func (wo *aeadCrypter) computeNextNonce() (nonce []byte) {
+	if wo.packetTag == packetTypeSymmetricallyEncryptedIntegrityProtected {
+		return wo.nonce
+	}
+
+	nonce = make([]byte, len(wo.nonce))
+	copy(nonce, wo.nonce)
+	offset := len(wo.nonce) - 8
+	for i := 0; i < 8; i++ {
+		nonce[i+offset] ^= wo.chunkIndex[i]
+	}
+	return
+}
+
+// incrementIndex performs an integer increment by 1 of the integer represented by the
+// slice, modifying it accordingly.
+func (wo *aeadCrypter) incrementIndex() error {
+	index := wo.chunkIndex
+	if len(index) == 0 {
+		return errors.AEADError("Index has length 0")
+	}
+	for i := len(index) - 1; i >= 0; i-- {
+		if index[i] < 255 {
+			index[i]++
+			return nil
+		}
+		index[i] = 0
+	}
+	return errors.AEADError("cannot further increment index")
+}
+
+// aeadDecrypter reads and decrypts bytes. It buffers extra decrypted bytes when
+// necessary, similar to aeadEncrypter.
+type aeadDecrypter struct {
+	aeadCrypter           // Embedded ciphertext opener
+	reader      io.Reader // 'reader' is a partialLengthReader
+	chunkBytes  []byte
+	peekedBytes []byte    // Used to detect last chunk
+	buffer      []byte    // Buffered decrypted bytes
+}
+
+// Read decrypts bytes and reads them into dst. It decrypts when necessary and
+// buffers extra decrypted bytes. It returns the number of bytes copied into dst
+// and an error.
+func (ar *aeadDecrypter) Read(dst []byte) (n int, err error) {
+	// Return buffered plaintext bytes from previous calls
+	if len(ar.buffer) > 0 {
+		n = copy(dst, ar.buffer)
+		ar.buffer = ar.buffer[n:]
+		return
+	}
+
+	// Read a chunk
+	tagLen := ar.aead.Overhead()
+	copy(ar.chunkBytes, ar.peekedBytes) // Copy bytes peeked in previous chunk or in initialization
+	bytesRead, errRead := io.ReadFull(ar.reader, ar.chunkBytes[tagLen:])
+	if errRead != nil && errRead != io.EOF && errRead != io.ErrUnexpectedEOF {
+		return 0, errRead
+	}
+
+	if bytesRead > 0 {
+		ar.peekedBytes = ar.chunkBytes[bytesRead:bytesRead+tagLen]
+
+		decrypted, errChunk := ar.openChunk(ar.chunkBytes[:bytesRead])
+		if errChunk != nil {
+			return 0, errChunk
+		}
+
+		// Return decrypted bytes, buffering if necessary
+		n = copy(dst, decrypted)
+		ar.buffer = decrypted[n:]
+		return
+	}
+
+	return 0, io.EOF
+}
+
+// Close checks the final authentication tag of the stream.
+// In the future, this function could also be used to wipe the reader
+// and peeked & decrypted bytes, if necessary.
+func (ar *aeadDecrypter) Close() (err error) {
+	errChunk := ar.validateFinalTag(ar.peekedBytes)
+	if errChunk != nil {
+		return errChunk
+	}
+	return nil
+}
+
+// openChunk decrypts and checks integrity of an encrypted chunk, returning
+// the underlying plaintext and an error. It accesses peeked bytes from next
+// chunk, to identify the last chunk and decrypt/validate accordingly.
+func (ar *aeadDecrypter) openChunk(data []byte) ([]byte, error) {
+	adata := ar.associatedData
+	if ar.aeadCrypter.packetTag == packetTypeAEADEncrypted {
+		adata = append(ar.associatedData, ar.chunkIndex...)
+	}
+
+	nonce := ar.computeNextNonce()
+	plainChunk, err := ar.aead.Open(data[:0:len(data)], nonce, data, adata)
+	if err != nil {
+		return nil, errors.ErrAEADTagVerification
+	}
+	ar.bytesProcessed += len(plainChunk)
+	if err = ar.aeadCrypter.incrementIndex(); err != nil {
+		return nil, err
+	}
+	return plainChunk, nil
+}
+
+// Checks the summary tag. It takes into account the total decrypted bytes into
+// the associated data. It returns an error, or nil if the tag is valid.
+func (ar *aeadDecrypter) validateFinalTag(tag []byte) error {
+	// Associated: tag, version, cipher, aead, chunk size, ...
+	amountBytes := make([]byte, 8)
+	binary.BigEndian.PutUint64(amountBytes, uint64(ar.bytesProcessed))
+
+	adata := ar.associatedData
+	if ar.aeadCrypter.packetTag == packetTypeAEADEncrypted {
+		// ... index ...
+		adata = append(ar.associatedData, ar.chunkIndex...)
+	}
+
+	// ... and total number of encrypted octets
+	adata = append(adata, amountBytes...)
+	nonce := ar.computeNextNonce()
+	if _, err := ar.aead.Open(nil, nonce, tag, adata); err != nil {
+		return errors.ErrAEADTagVerification
+	}
+	return nil
+}
+
+// aeadEncrypter encrypts and writes bytes. It encrypts when necessary according
+// to the AEAD block size, and buffers the extra encrypted bytes for next write.
+type aeadEncrypter struct {
+	aeadCrypter                // Embedded plaintext sealer
+	writer      io.WriteCloser // 'writer' is a partialLengthWriter
+	chunkBytes  []byte
+	offset      int
+}
+
+// Write encrypts and writes bytes. It encrypts when necessary and buffers extra
+// plaintext bytes for next call. When the stream is finished, Close() MUST be
+// called to append the final tag.
+func (aw *aeadEncrypter) Write(plaintextBytes []byte) (n int, err error) {
+	for n != len(plaintextBytes) {
+		copied := copy(aw.chunkBytes[aw.offset:aw.chunkSize], plaintextBytes[n:])
+		n += copied
+		aw.offset += copied
+
+		if aw.offset == aw.chunkSize {
+			encryptedChunk, err := aw.sealChunk(aw.chunkBytes[:aw.offset])
+			if err != nil {
+				return n, err
+			}
+			_, err = aw.writer.Write(encryptedChunk)
+			if err != nil {
+				return n, err
+			}
+			aw.offset = 0
+		}
+	}
+	return
+}
+
+// Close encrypts and writes the remaining buffered plaintext if any, appends
+// the final authentication tag, and closes the embedded writer. This function
+// MUST be called at the end of a stream.
+func (aw *aeadEncrypter) Close() (err error) {
+	// Encrypt and write a chunk if there's buffered data left, or if we haven't
+	// written any chunks yet.
+	if aw.offset > 0 || aw.bytesProcessed == 0 {
+		lastEncryptedChunk, err := aw.sealChunk(aw.chunkBytes[:aw.offset])
+		if err != nil {
+			return err
+		}
+		_, err = aw.writer.Write(lastEncryptedChunk)
+		if err != nil {
+			return err
+		}
+	}
+	// Compute final tag (associated data: packet tag, version, cipher, aead,
+	// chunk size...
+	adata := aw.associatedData
+
+	if aw.aeadCrypter.packetTag == packetTypeAEADEncrypted {
+		// ... index ...
+		adata = append(aw.associatedData, aw.chunkIndex...)
+	}
+
+	// ... and total number of encrypted octets
+	amountBytes := make([]byte, 8)
+	binary.BigEndian.PutUint64(amountBytes, uint64(aw.bytesProcessed))
+	adata = append(adata, amountBytes...)
+
+	nonce := aw.computeNextNonce()
+	finalTag := aw.aead.Seal(nil, nonce, nil, adata)
+	_, err = aw.writer.Write(finalTag)
+	if err != nil {
+		return err
+	}
+	return aw.writer.Close()
+}
+
+// sealChunk Encrypts and authenticates the given chunk.
+func (aw *aeadEncrypter) sealChunk(data []byte) ([]byte, error) {
+	if len(data) > aw.chunkSize {
+		return nil, errors.AEADError("chunk exceeds maximum length")
+	}
+	if aw.associatedData == nil {
+		return nil, errors.AEADError("can't seal without headers")
+	}
+	adata := aw.associatedData
+	if aw.aeadCrypter.packetTag == packetTypeAEADEncrypted {
+		adata = append(aw.associatedData, aw.chunkIndex...)
+	}
+
+	nonce := aw.computeNextNonce()
+	encrypted := aw.aead.Seal(data[:0], nonce, data, adata)
+	aw.bytesProcessed += len(data)
+	if err := aw.aeadCrypter.incrementIndex(); err != nil {
+		return nil, err
+	}
+	return encrypted, nil
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/aead_encrypted.go

@@ -0,0 +1,100 @@
+// Copyright (C) 2019 ProtonTech AG
+
+package packet
+
+import (
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
+)
+
+// AEADEncrypted represents an AEAD Encrypted Packet.
+// See https://www.ietf.org/archive/id/draft-koch-openpgp-2015-rfc4880bis-00.html#name-aead-encrypted-data-packet-t
+type AEADEncrypted struct {
+	cipher        CipherFunction
+	mode          AEADMode
+	chunkSizeByte byte
+	Contents      io.Reader // Encrypted chunks and tags
+	initialNonce  []byte    // Referred to as IV in RFC4880-bis
+}
+
+// Only currently defined version
+const aeadEncryptedVersion = 1
+
+func (ae *AEADEncrypted) parse(buf io.Reader) error {
+	headerData := make([]byte, 4)
+	if n, err := io.ReadFull(buf, headerData); n < 4 {
+		return errors.AEADError("could not read aead header:" + err.Error())
+	}
+	// Read initial nonce
+	mode := AEADMode(headerData[2])
+	nonceLen := mode.IvLength()
+
+	// This packet supports only EAX and OCB
+	// https://www.ietf.org/archive/id/draft-koch-openpgp-2015-rfc4880bis-00.html#name-aead-encrypted-data-packet-t
+	if nonceLen == 0 || mode > AEADModeOCB {
+		return errors.AEADError("unknown mode")
+	}
+
+	initialNonce := make([]byte, nonceLen)
+	if n, err := io.ReadFull(buf, initialNonce); n < nonceLen {
+		return errors.AEADError("could not read aead nonce:" + err.Error())
+	}
+	ae.Contents = buf
+	ae.initialNonce = initialNonce
+	c := headerData[1]
+	if _, ok := algorithm.CipherById[c]; !ok {
+		return errors.UnsupportedError("unknown cipher: " + string(c))
+	}
+	ae.cipher = CipherFunction(c)
+	ae.mode = mode
+	ae.chunkSizeByte = headerData[3]
+	return nil
+}
+
+// Decrypt returns a io.ReadCloser from which decrypted bytes can be read, or
+// an error.
+func (ae *AEADEncrypted) Decrypt(ciph CipherFunction, key []byte) (io.ReadCloser, error) {
+	return ae.decrypt(key)
+}
+
+// decrypt prepares an aeadCrypter and returns a ReadCloser from which
+// decrypted bytes can be read (see aeadDecrypter.Read()).
+func (ae *AEADEncrypted) decrypt(key []byte) (io.ReadCloser, error) {
+	blockCipher := ae.cipher.new(key)
+	aead := ae.mode.new(blockCipher)
+	// Carry the first tagLen bytes
+	chunkSize := decodeAEADChunkSize(ae.chunkSizeByte)
+	tagLen := ae.mode.TagLength()
+	chunkBytes := make([]byte, chunkSize+tagLen*2)
+	peekedBytes := chunkBytes[chunkSize+tagLen:]
+	n, err := io.ReadFull(ae.Contents, peekedBytes)
+	if n < tagLen || (err != nil && err != io.EOF) {
+		return nil, errors.AEADError("Not enough data to decrypt:" + err.Error())
+	}
+
+	return &aeadDecrypter{
+		aeadCrypter: aeadCrypter{
+			aead:           aead,
+			chunkSize:      chunkSize,
+			nonce:          ae.initialNonce,
+			associatedData: ae.associatedData(),
+			chunkIndex:     make([]byte, 8),
+			packetTag:      packetTypeAEADEncrypted,
+		},
+		reader:      ae.Contents,
+		chunkBytes:  chunkBytes,
+		peekedBytes: peekedBytes,
+	}, nil
+}
+
+// associatedData for chunks: tag, version, cipher, mode, chunk size byte
+func (ae *AEADEncrypted) associatedData() []byte {
+	return []byte{
+		0xD4,
+		aeadEncryptedVersion,
+		byte(ae.cipher),
+		byte(ae.mode),
+		ae.chunkSizeByte}
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/compressed.go

@@ -0,0 +1,161 @@
+// 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"
+	"io"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+// 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
+}
+
+// decompressionReader ensures that the whole compression packet is read.
+type decompressionReader struct {
+	compressed   io.Reader
+	decompressed io.ReadCloser
+	readAll      bool
+}
+
+func newDecompressionReader(r io.Reader, decompressor io.ReadCloser) *decompressionReader {
+	return &decompressionReader{
+		compressed:   r,
+		decompressed: decompressor,
+	}
+}
+
+func (dr *decompressionReader) Read(data []byte) (n int, err error) {
+	if dr.readAll {
+		return 0, io.EOF
+	}
+	n, err = dr.decompressed.Read(data)
+	if err == io.EOF {
+		dr.readAll = true
+		// Close the decompressor.
+		if errDec := dr.decompressed.Close(); errDec != nil {
+			return n, errDec
+		}
+		// Consume all remaining data from the compressed packet.
+		consumeAll(dr.compressed)
+	}
+	return n, err
+}
+
+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 0:
+		c.Body = r
+	case 1:
+		c.Body = newDecompressionReader(r, flate.NewReader(r))
+	case 2:
+		decompressor, err := zlib.NewReader(r)
+		if err != nil {
+			return err
+		}
+		c.Body = newDecompressionReader(r, decompressor)
+	case 3:
+		c.Body = newDecompressionReader(r, io.NopCloser(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
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/config.go

@@ -0,0 +1,422 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto"
+	"crypto/rand"
+	"io"
+	"math/big"
+	"time"
+
+	"github.com/ProtonMail/go-crypto/openpgp/s2k"
+)
+
+var (
+	defaultRejectPublicKeyAlgorithms = map[PublicKeyAlgorithm]bool{
+		PubKeyAlgoElGamal: true,
+		PubKeyAlgoDSA:     true,
+	}
+	defaultRejectHashAlgorithms = map[crypto.Hash]bool{
+		crypto.MD5:       true,
+		crypto.RIPEMD160: true,
+	}
+	defaultRejectMessageHashAlgorithms = map[crypto.Hash]bool{
+		crypto.SHA1:      true,
+		crypto.MD5:       true,
+		crypto.RIPEMD160: true,
+	}
+	defaultRejectCurves = map[Curve]bool{
+		CurveSecP256k1: true,
+	}
+)
+
+// A global feature flag to indicate v5 support.
+// Can be set via a build tag, e.g.: `go build -tags v5 ./...`
+// If the build tag is missing config_v5.go will set it to true.
+//
+// Disables parsing of v5 keys and v5 signatures.
+// These are non-standard entities, which in the crypto-refresh have been superseded
+// by v6 keys, v6 signatures and SEIPDv2 encrypted data, respectively.
+var V5Disabled = false
+
+// 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
+	// S2K (String to Key) config, used for key derivation in the context of secret key encryption
+	// and password-encrypted data.
+	// If nil, the default configuration is used
+	S2KConfig *s2k.Config
+	// Iteration count for Iterated S2K (String to Key).
+	// Only used if sk2.Mode is nil.
+	// This value is duplicated here from s2k.Config for backwards compatibility.
+	// It determines the strength of the passphrase stretching when
+	// the said passphrase is hashed to produce a key. S2KCount
+	// should be between 65536 and 65011712, inclusive. If Config
+	// is nil or S2KCount is 0, the value 16777216 used. Not all
+	// values in the above range can be represented. S2KCount will
+	// be rounded up to the next representable value if it cannot
+	// be encoded exactly. When set, it is strongly encrouraged to
+	// use a value that is at least 65536. See RFC 4880 Section
+	// 3.7.1.3.
+	//
+	// Deprecated: SK2Count should be configured in S2KConfig instead.
+	S2KCount int
+	// RSABits is the number of bits in new RSA keys made with NewEntity.
+	// If zero, then 2048 bit keys are created.
+	RSABits int
+	// The public key algorithm to use - will always create a signing primary
+	// key and encryption subkey.
+	Algorithm PublicKeyAlgorithm
+	// Some known primes that are optionally prepopulated by the caller
+	RSAPrimes []*big.Int
+	// Curve configures the desired packet.Curve if the Algorithm is PubKeyAlgoECDSA,
+	// PubKeyAlgoEdDSA, or PubKeyAlgoECDH. If empty Curve25519 is used.
+	Curve Curve
+	// AEADConfig configures the use of the new AEAD Encrypted Data Packet,
+	// defined in the draft of the next version of the OpenPGP specification.
+	// If a non-nil AEADConfig is passed, usage of this packet is enabled. By
+	// default, it is disabled. See the documentation of AEADConfig for more
+	// configuration options related to AEAD.
+	// **Note: using this option may break compatibility with other OpenPGP
+	// implementations, as well as future versions of this library.**
+	AEADConfig *AEADConfig
+	// V6Keys configures version 6 key generation. If false, this package still
+	// supports version 6 keys, but produces version 4 keys.
+	V6Keys bool
+	// Minimum RSA key size allowed for key generation and message signing, verification and encryption.
+	MinRSABits uint16
+	// Reject insecure algorithms, only works with v2 api
+	RejectPublicKeyAlgorithms   map[PublicKeyAlgorithm]bool
+	RejectHashAlgorithms        map[crypto.Hash]bool
+	RejectMessageHashAlgorithms map[crypto.Hash]bool
+	RejectCurves                map[Curve]bool
+	// "The validity period of the key.  This is the number of seconds after
+	// the key creation time that the key expires.  If this is not present
+	// or has a value of zero, the key never expires.  This is found only on
+	// a self-signature.""
+	// https://tools.ietf.org/html/rfc4880#section-5.2.3.6
+	KeyLifetimeSecs uint32
+	// "The validity period of the signature.  This is the number of seconds
+	// after the signature creation time that the signature expires.  If
+	// this is not present or has a value of zero, it never expires."
+	// https://tools.ietf.org/html/rfc4880#section-5.2.3.10
+	SigLifetimeSecs uint32
+	// SigningKeyId is used to specify the signing key to use (by Key ID).
+	// By default, the signing key is selected automatically, preferring
+	// signing subkeys if available.
+	SigningKeyId uint64
+	// SigningIdentity is used to specify a user ID (packet Signer's User ID, type 28)
+	// when producing a generic certification signature onto an existing user ID.
+	// The identity must be present in the signer Entity.
+	SigningIdentity string
+	// InsecureAllowUnauthenticatedMessages controls, whether it is tolerated to read
+	// encrypted messages without Modification Detection Code (MDC).
+	// MDC is mandated by the IETF OpenPGP Crypto Refresh draft and has long been implemented
+	// in most OpenPGP implementations. Messages without MDC are considered unnecessarily
+	// insecure and should be prevented whenever possible.
+	// In case one needs to deal with messages from very old OpenPGP implementations, there
+	// might be no other way than to tolerate the missing MDC. Setting this flag, allows this
+	// mode of operation. It should be considered a measure of last resort.
+	InsecureAllowUnauthenticatedMessages bool
+	// InsecureAllowDecryptionWithSigningKeys allows decryption with keys marked as signing keys in the v2 API.
+	// This setting is potentially insecure, but it is needed as some libraries
+	// ignored key flags when selecting a key for encryption.
+	// Not relevant for the v1 API, as all keys were allowed in decryption.
+	InsecureAllowDecryptionWithSigningKeys bool
+	// KnownNotations is a map of Notation Data names to bools, which controls
+	// the notation names that are allowed to be present in critical Notation Data
+	// signature subpackets.
+	KnownNotations map[string]bool
+	// SignatureNotations is a list of Notations to be added to any signatures.
+	SignatureNotations []*Notation
+	// CheckIntendedRecipients controls, whether the OpenPGP Intended Recipient Fingerprint feature
+	// should be enabled for encryption and decryption.
+	// (See https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-intended-recipient-fingerpr).
+	// When the flag is set, encryption produces Intended Recipient Fingerprint signature sub-packets and decryption
+	// checks whether the key it was encrypted to is one of the included fingerprints in the signature.
+	// If the flag is disabled, no Intended Recipient Fingerprint sub-packets are created or checked.
+	// The default behavior, when the config or flag is nil, is to enable the feature.
+	CheckIntendedRecipients *bool
+	// CacheSessionKey controls if decryption should return the session key used for decryption.
+	// If the flag is set, the session key is cached in the message details struct.
+	CacheSessionKey bool
+	// CheckPacketSequence is a flag that controls if the pgp message reader should strictly check
+	// that the packet sequence conforms with the grammar mandated by rfc4880.
+	// The default behavior, when the config or flag is nil, is to check the packet sequence.
+	CheckPacketSequence *bool
+	// NonDeterministicSignaturesViaNotation is a flag to enable randomization of signatures.
+	// If true, a salt notation is used to randomize signatures generated by v4 and v5 keys
+	// (v6 signatures are always non-deterministic, by design).
+	// This protects EdDSA signatures from potentially leaking the secret key in case of faults (i.e. bitflips) which, in principle, could occur
+	// during the signing computation. It is added to signatures of any algo for simplicity, and as it may also serve as protection in case of
+	// weaknesses in the hash algo, potentially hindering e.g. some chosen-prefix attacks.
+	// The default behavior, when the config or flag is nil, is to enable the feature.
+	NonDeterministicSignaturesViaNotation *bool
+
+	// InsecureAllowAllKeyFlagsWhenMissing determines how a key without valid key flags is handled.
+	// When set to true, a key without flags is treated as if all flags are enabled.
+	// This behavior is consistent with GPG.
+	InsecureAllowAllKeyFlagsWhenMissing bool
+}
+
+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().Truncate(time.Second)
+	}
+	return c.Time().Truncate(time.Second)
+}
+
+// KeyLifetime returns the validity period of the key.
+func (c *Config) KeyLifetime() uint32 {
+	if c == nil {
+		return 0
+	}
+	return c.KeyLifetimeSecs
+}
+
+// SigLifetime returns the validity period of the signature.
+func (c *Config) SigLifetime() uint32 {
+	if c == nil {
+		return 0
+	}
+	return c.SigLifetimeSecs
+}
+
+func (c *Config) Compression() CompressionAlgo {
+	if c == nil {
+		return CompressionNone
+	}
+	return c.DefaultCompressionAlgo
+}
+
+func (c *Config) RSAModulusBits() int {
+	if c == nil || c.RSABits == 0 {
+		return 2048
+	}
+	return c.RSABits
+}
+
+func (c *Config) PublicKeyAlgorithm() PublicKeyAlgorithm {
+	if c == nil || c.Algorithm == 0 {
+		return PubKeyAlgoRSA
+	}
+	return c.Algorithm
+}
+
+func (c *Config) CurveName() Curve {
+	if c == nil || c.Curve == "" {
+		return Curve25519
+	}
+	return c.Curve
+}
+
+// Deprecated: The hash iterations should now be queried via the S2K() method.
+func (c *Config) PasswordHashIterations() int {
+	if c == nil || c.S2KCount == 0 {
+		return 0
+	}
+	return c.S2KCount
+}
+
+func (c *Config) S2K() *s2k.Config {
+	if c == nil {
+		return nil
+	}
+	// for backwards compatibility
+	if c.S2KCount > 0 && c.S2KConfig == nil {
+		return &s2k.Config{
+			S2KCount: c.S2KCount,
+		}
+	}
+	return c.S2KConfig
+}
+
+func (c *Config) AEAD() *AEADConfig {
+	if c == nil {
+		return nil
+	}
+	return c.AEADConfig
+}
+
+func (c *Config) SigningKey() uint64 {
+	if c == nil {
+		return 0
+	}
+	return c.SigningKeyId
+}
+
+func (c *Config) SigningUserId() string {
+	if c == nil {
+		return ""
+	}
+	return c.SigningIdentity
+}
+
+func (c *Config) AllowUnauthenticatedMessages() bool {
+	if c == nil {
+		return false
+	}
+	return c.InsecureAllowUnauthenticatedMessages
+}
+
+func (c *Config) AllowDecryptionWithSigningKeys() bool {
+	if c == nil {
+		return false
+	}
+	return c.InsecureAllowDecryptionWithSigningKeys
+}
+
+func (c *Config) KnownNotation(notationName string) bool {
+	if c == nil {
+		return false
+	}
+	return c.KnownNotations[notationName]
+}
+
+func (c *Config) Notations() []*Notation {
+	if c == nil {
+		return nil
+	}
+	return c.SignatureNotations
+}
+
+func (c *Config) V6() bool {
+	if c == nil {
+		return false
+	}
+	return c.V6Keys
+}
+
+func (c *Config) IntendedRecipients() bool {
+	if c == nil || c.CheckIntendedRecipients == nil {
+		return true
+	}
+	return *c.CheckIntendedRecipients
+}
+
+func (c *Config) RetrieveSessionKey() bool {
+	if c == nil {
+		return false
+	}
+	return c.CacheSessionKey
+}
+
+func (c *Config) MinimumRSABits() uint16 {
+	if c == nil || c.MinRSABits == 0 {
+		return 2047
+	}
+	return c.MinRSABits
+}
+
+func (c *Config) RejectPublicKeyAlgorithm(alg PublicKeyAlgorithm) bool {
+	var rejectedAlgorithms map[PublicKeyAlgorithm]bool
+	if c == nil || c.RejectPublicKeyAlgorithms == nil {
+		// Default
+		rejectedAlgorithms = defaultRejectPublicKeyAlgorithms
+	} else {
+		rejectedAlgorithms = c.RejectPublicKeyAlgorithms
+	}
+	return rejectedAlgorithms[alg]
+}
+
+func (c *Config) RejectHashAlgorithm(hash crypto.Hash) bool {
+	var rejectedAlgorithms map[crypto.Hash]bool
+	if c == nil || c.RejectHashAlgorithms == nil {
+		// Default
+		rejectedAlgorithms = defaultRejectHashAlgorithms
+	} else {
+		rejectedAlgorithms = c.RejectHashAlgorithms
+	}
+	return rejectedAlgorithms[hash]
+}
+
+func (c *Config) RejectMessageHashAlgorithm(hash crypto.Hash) bool {
+	var rejectedAlgorithms map[crypto.Hash]bool
+	if c == nil || c.RejectMessageHashAlgorithms == nil {
+		// Default
+		rejectedAlgorithms = defaultRejectMessageHashAlgorithms
+	} else {
+		rejectedAlgorithms = c.RejectMessageHashAlgorithms
+	}
+	return rejectedAlgorithms[hash]
+}
+
+func (c *Config) RejectCurve(curve Curve) bool {
+	var rejectedCurve map[Curve]bool
+	if c == nil || c.RejectCurves == nil {
+		// Default
+		rejectedCurve = defaultRejectCurves
+	} else {
+		rejectedCurve = c.RejectCurves
+	}
+	return rejectedCurve[curve]
+}
+
+func (c *Config) StrictPacketSequence() bool {
+	if c == nil || c.CheckPacketSequence == nil {
+		return true
+	}
+	return *c.CheckPacketSequence
+}
+
+func (c *Config) RandomizeSignaturesViaNotation() bool {
+	if c == nil || c.NonDeterministicSignaturesViaNotation == nil {
+		return true
+	}
+	return *c.NonDeterministicSignaturesViaNotation
+}
+
+func (c *Config) AllowAllKeyFlagsWhenMissing() bool {
+	if c == nil {
+		return false
+	}
+	return c.InsecureAllowAllKeyFlagsWhenMissing
+}
+
+// BoolPointer is a helper function to set a boolean pointer in the Config.
+// e.g., config.CheckPacketSequence = BoolPointer(true)
+func BoolPointer(value bool) *bool {
+	return &value
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/config_v5.go

@@ -0,0 +1,7 @@
+//go:build !v5
+
+package packet
+
+func init() {
+	V5Disabled = true
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/encrypted_key.go

@@ -0,0 +1,584 @@
+// 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/rsa"
+	"encoding/binary"
+	"encoding/hex"
+	"io"
+	"math/big"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/ecdh"
+	"github.com/ProtonMail/go-crypto/openpgp/elgamal"
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
+	"github.com/ProtonMail/go-crypto/openpgp/x25519"
+	"github.com/ProtonMail/go-crypto/openpgp/x448"
+)
+
+// EncryptedKey represents a public-key encrypted session key. See RFC 4880,
+// section 5.1.
+type EncryptedKey struct {
+	Version        int
+	KeyId          uint64
+	KeyVersion     int    // v6
+	KeyFingerprint []byte // v6
+	Algo           PublicKeyAlgorithm
+	CipherFunc     CipherFunction // only valid after a successful Decrypt for a v3 packet
+	Key            []byte         // only valid after a successful Decrypt
+
+	encryptedMPI1, encryptedMPI2 encoding.Field
+	ephemeralPublicX25519        *x25519.PublicKey // used for x25519
+	ephemeralPublicX448          *x448.PublicKey   // used for x448
+	encryptedSession             []byte            // used for x25519 and x448
+}
+
+func (e *EncryptedKey) parse(r io.Reader) (err error) {
+	var buf [8]byte
+	_, err = readFull(r, buf[:versionSize])
+	if err != nil {
+		return
+	}
+	e.Version = int(buf[0])
+	if e.Version != 3 && e.Version != 6 {
+		return errors.UnsupportedError("unknown EncryptedKey version " + strconv.Itoa(int(buf[0])))
+	}
+	if e.Version == 6 {
+		//Read a one-octet size of the following two fields.
+		if _, err = readFull(r, buf[:1]); err != nil {
+			return
+		}
+		// The size may also be zero, and the key version and
+		// fingerprint omitted for an "anonymous recipient"
+		if buf[0] != 0 {
+			// non-anonymous case
+			_, err = readFull(r, buf[:versionSize])
+			if err != nil {
+				return
+			}
+			e.KeyVersion = int(buf[0])
+			if e.KeyVersion != 4 && e.KeyVersion != 6 {
+				return errors.UnsupportedError("unknown public key version " + strconv.Itoa(e.KeyVersion))
+			}
+			var fingerprint []byte
+			if e.KeyVersion == 6 {
+				fingerprint = make([]byte, fingerprintSizeV6)
+			} else if e.KeyVersion == 4 {
+				fingerprint = make([]byte, fingerprintSize)
+			}
+			_, err = readFull(r, fingerprint)
+			if err != nil {
+				return
+			}
+			e.KeyFingerprint = fingerprint
+			if e.KeyVersion == 6 {
+				e.KeyId = binary.BigEndian.Uint64(e.KeyFingerprint[:keyIdSize])
+			} else if e.KeyVersion == 4 {
+				e.KeyId = binary.BigEndian.Uint64(e.KeyFingerprint[fingerprintSize-keyIdSize : fingerprintSize])
+			}
+		}
+	} else {
+		_, err = readFull(r, buf[:8])
+		if err != nil {
+			return
+		}
+		e.KeyId = binary.BigEndian.Uint64(buf[:keyIdSize])
+	}
+
+	_, err = readFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	e.Algo = PublicKeyAlgorithm(buf[0])
+	var cipherFunction byte
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		e.encryptedMPI1 = new(encoding.MPI)
+		if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
+			return
+		}
+	case PubKeyAlgoElGamal:
+		e.encryptedMPI1 = new(encoding.MPI)
+		if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
+			return
+		}
+
+		e.encryptedMPI2 = new(encoding.MPI)
+		if _, err = e.encryptedMPI2.ReadFrom(r); err != nil {
+			return
+		}
+	case PubKeyAlgoECDH:
+		e.encryptedMPI1 = new(encoding.MPI)
+		if _, err = e.encryptedMPI1.ReadFrom(r); err != nil {
+			return
+		}
+
+		e.encryptedMPI2 = new(encoding.OID)
+		if _, err = e.encryptedMPI2.ReadFrom(r); err != nil {
+			return
+		}
+	case PubKeyAlgoX25519:
+		e.ephemeralPublicX25519, e.encryptedSession, cipherFunction, err = x25519.DecodeFields(r, e.Version == 6)
+		if err != nil {
+			return
+		}
+	case PubKeyAlgoX448:
+		e.ephemeralPublicX448, e.encryptedSession, cipherFunction, err = x448.DecodeFields(r, e.Version == 6)
+		if err != nil {
+			return
+		}
+	}
+	if e.Version < 6 {
+		switch e.Algo {
+		case PubKeyAlgoX25519, PubKeyAlgoX448:
+			e.CipherFunc = CipherFunction(cipherFunction)
+			// Check for validiy is in the Decrypt method
+		}
+	}
+
+	_, err = consumeAll(r)
+	return
+}
+
+// Decrypt decrypts an encrypted session key with the given private key. The
+// private key must have been decrypted first.
+// If config is nil, sensible defaults will be used.
+func (e *EncryptedKey) Decrypt(priv *PrivateKey, config *Config) error {
+	if e.Version < 6 && e.KeyId != 0 && e.KeyId != priv.KeyId {
+		return errors.InvalidArgumentError("cannot decrypt encrypted session key for key id " + strconv.FormatUint(e.KeyId, 16) + " with private key id " + strconv.FormatUint(priv.KeyId, 16))
+	}
+	if e.Version == 6 && e.KeyVersion != 0 && !bytes.Equal(e.KeyFingerprint, priv.Fingerprint) {
+		return errors.InvalidArgumentError("cannot decrypt encrypted session key for key fingerprint " + hex.EncodeToString(e.KeyFingerprint) + " with private key fingerprint " + hex.EncodeToString(priv.Fingerprint))
+	}
+	if e.Algo != priv.PubKeyAlgo {
+		return errors.InvalidArgumentError("cannot decrypt encrypted session key of type " + strconv.Itoa(int(e.Algo)) + " with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
+	}
+	if priv.Dummy() {
+		return errors.ErrDummyPrivateKey("dummy key found")
+	}
+
+	var err error
+	var b []byte
+
+	// TODO(agl): use session key decryption routines here to avoid
+	// padding oracle attacks.
+	switch priv.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		// Supports both *rsa.PrivateKey and crypto.Decrypter
+		k := priv.PrivateKey.(crypto.Decrypter)
+		b, err = k.Decrypt(config.Random(), padToKeySize(k.Public().(*rsa.PublicKey), e.encryptedMPI1.Bytes()), nil)
+	case PubKeyAlgoElGamal:
+		c1 := new(big.Int).SetBytes(e.encryptedMPI1.Bytes())
+		c2 := new(big.Int).SetBytes(e.encryptedMPI2.Bytes())
+		b, err = elgamal.Decrypt(priv.PrivateKey.(*elgamal.PrivateKey), c1, c2)
+	case PubKeyAlgoECDH:
+		vsG := e.encryptedMPI1.Bytes()
+		m := e.encryptedMPI2.Bytes()
+		oid := priv.PublicKey.oid.EncodedBytes()
+		fp := priv.PublicKey.Fingerprint[:]
+		if priv.PublicKey.Version == 5 {
+			// For v5 the, the fingerprint must be restricted to 20 bytes
+			fp = fp[:20]
+		}
+		b, err = ecdh.Decrypt(priv.PrivateKey.(*ecdh.PrivateKey), vsG, m, oid, fp)
+	case PubKeyAlgoX25519:
+		b, err = x25519.Decrypt(priv.PrivateKey.(*x25519.PrivateKey), e.ephemeralPublicX25519, e.encryptedSession)
+	case PubKeyAlgoX448:
+		b, err = x448.Decrypt(priv.PrivateKey.(*x448.PrivateKey), e.ephemeralPublicX448, e.encryptedSession)
+	default:
+		err = errors.InvalidArgumentError("cannot decrypt encrypted session key with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
+	}
+	if err != nil {
+		return err
+	}
+
+	var key []byte
+	switch priv.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal, PubKeyAlgoECDH:
+		keyOffset := 0
+		if e.Version < 6 {
+			e.CipherFunc = CipherFunction(b[0])
+			keyOffset = 1
+			if !e.CipherFunc.IsSupported() {
+				return errors.UnsupportedError("unsupported encryption function")
+			}
+		}
+		key, err = decodeChecksumKey(b[keyOffset:])
+		if err != nil {
+			return err
+		}
+	case PubKeyAlgoX25519, PubKeyAlgoX448:
+		if e.Version < 6 {
+			switch e.CipherFunc {
+			case CipherAES128, CipherAES192, CipherAES256:
+				break
+			default:
+				return errors.StructuralError("v3 PKESK mandates AES as cipher function for x25519 and x448")
+			}
+		}
+		key = b[:]
+	default:
+		return errors.UnsupportedError("unsupported algorithm for decryption")
+	}
+	e.Key = key
+	return nil
+}
+
+// Serialize writes the encrypted key packet, e, to w.
+func (e *EncryptedKey) Serialize(w io.Writer) error {
+	var encodedLength int
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		encodedLength = int(e.encryptedMPI1.EncodedLength())
+	case PubKeyAlgoElGamal:
+		encodedLength = int(e.encryptedMPI1.EncodedLength()) + int(e.encryptedMPI2.EncodedLength())
+	case PubKeyAlgoECDH:
+		encodedLength = int(e.encryptedMPI1.EncodedLength()) + int(e.encryptedMPI2.EncodedLength())
+	case PubKeyAlgoX25519:
+		encodedLength = x25519.EncodedFieldsLength(e.encryptedSession, e.Version == 6)
+	case PubKeyAlgoX448:
+		encodedLength = x448.EncodedFieldsLength(e.encryptedSession, e.Version == 6)
+	default:
+		return errors.InvalidArgumentError("don't know how to serialize encrypted key type " + strconv.Itoa(int(e.Algo)))
+	}
+
+	packetLen := versionSize /* version */ + keyIdSize /* key id */ + algorithmSize /* algo */ + encodedLength
+	if e.Version == 6 {
+		packetLen = versionSize /* version */ + algorithmSize /* algo */ + encodedLength + keyVersionSize /* key version */
+		if e.KeyVersion == 6 {
+			packetLen += fingerprintSizeV6
+		} else if e.KeyVersion == 4 {
+			packetLen += fingerprintSize
+		}
+	}
+
+	err := serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write([]byte{byte(e.Version)})
+	if err != nil {
+		return err
+	}
+	if e.Version == 6 {
+		_, err = w.Write([]byte{byte(e.KeyVersion)})
+		if err != nil {
+			return err
+		}
+		// The key version number may also be zero,
+		// and the fingerprint omitted
+		if e.KeyVersion != 0 {
+			_, err = w.Write(e.KeyFingerprint)
+			if err != nil {
+				return err
+			}
+		}
+	} else {
+		// Write KeyID
+		err = binary.Write(w, binary.BigEndian, e.KeyId)
+		if err != nil {
+			return err
+		}
+	}
+	_, err = w.Write([]byte{byte(e.Algo)})
+	if err != nil {
+		return err
+	}
+
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		_, err := w.Write(e.encryptedMPI1.EncodedBytes())
+		return err
+	case PubKeyAlgoElGamal:
+		if _, err := w.Write(e.encryptedMPI1.EncodedBytes()); err != nil {
+			return err
+		}
+		_, err := w.Write(e.encryptedMPI2.EncodedBytes())
+		return err
+	case PubKeyAlgoECDH:
+		if _, err := w.Write(e.encryptedMPI1.EncodedBytes()); err != nil {
+			return err
+		}
+		_, err := w.Write(e.encryptedMPI2.EncodedBytes())
+		return err
+	case PubKeyAlgoX25519:
+		err := x25519.EncodeFields(w, e.ephemeralPublicX25519, e.encryptedSession, byte(e.CipherFunc), e.Version == 6)
+		return err
+	case PubKeyAlgoX448:
+		err := x448.EncodeFields(w, e.ephemeralPublicX448, e.encryptedSession, byte(e.CipherFunc), e.Version == 6)
+		return err
+	default:
+		panic("internal error")
+	}
+}
+
+// SerializeEncryptedKeyAEAD serializes an encrypted key packet to w that contains
+// key, encrypted to pub.
+// If aeadSupported is set, PKESK v6 is used, otherwise v3.
+// Note: aeadSupported MUST match the value passed to SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+func SerializeEncryptedKeyAEAD(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, aeadSupported bool, key []byte, config *Config) error {
+	return SerializeEncryptedKeyAEADwithHiddenOption(w, pub, cipherFunc, aeadSupported, key, false, config)
+}
+
+// SerializeEncryptedKeyAEADwithHiddenOption serializes an encrypted key packet to w that contains
+// key, encrypted to pub.
+// Offers the hidden flag option to indicated if the PKESK packet should include a wildcard KeyID.
+// If aeadSupported is set, PKESK v6 is used, otherwise v3.
+// Note: aeadSupported MUST match the value passed to SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+func SerializeEncryptedKeyAEADwithHiddenOption(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, aeadSupported bool, key []byte, hidden bool, config *Config) error {
+	var buf [36]byte // max possible header size is v6
+	lenHeaderWritten := versionSize
+	version := 3
+
+	if aeadSupported {
+		version = 6
+	}
+	// An implementation MUST NOT generate ElGamal v6 PKESKs.
+	if version == 6 && pub.PubKeyAlgo == PubKeyAlgoElGamal {
+		return errors.InvalidArgumentError("ElGamal v6 PKESK are not allowed")
+	}
+	// In v3 PKESKs, for x25519 and x448, mandate using AES
+	if version == 3 && (pub.PubKeyAlgo == PubKeyAlgoX25519 || pub.PubKeyAlgo == PubKeyAlgoX448) {
+		switch cipherFunc {
+		case CipherAES128, CipherAES192, CipherAES256:
+			break
+		default:
+			return errors.InvalidArgumentError("v3 PKESK mandates AES for x25519 and x448")
+		}
+	}
+
+	buf[0] = byte(version)
+
+	// If hidden is set, the key should be hidden
+	// An implementation MAY accept or use a Key ID of all zeros,
+	// or a key version of zero and no key fingerprint, to hide the intended decryption key.
+	// See Section 5.1.8. in the open pgp crypto refresh
+	if version == 6 {
+		if !hidden {
+			// A one-octet size of the following two fields.
+			buf[1] = byte(keyVersionSize + len(pub.Fingerprint))
+			// A one octet key version number.
+			buf[2] = byte(pub.Version)
+			lenHeaderWritten += keyVersionSize + 1
+			// The fingerprint of the public key
+			copy(buf[lenHeaderWritten:lenHeaderWritten+len(pub.Fingerprint)], pub.Fingerprint)
+			lenHeaderWritten += len(pub.Fingerprint)
+		} else {
+			// The size may also be zero, and the key version
+			// and fingerprint omitted for an "anonymous recipient"
+			buf[1] = 0
+			lenHeaderWritten += 1
+		}
+	} else {
+		if !hidden {
+			binary.BigEndian.PutUint64(buf[versionSize:(versionSize+keyIdSize)], pub.KeyId)
+		}
+		lenHeaderWritten += keyIdSize
+	}
+	buf[lenHeaderWritten] = byte(pub.PubKeyAlgo)
+	lenHeaderWritten += algorithmSize
+
+	var keyBlock []byte
+	switch pub.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal, PubKeyAlgoECDH:
+		lenKeyBlock := len(key) + 2
+		if version < 6 {
+			lenKeyBlock += 1 // cipher type included
+		}
+		keyBlock = make([]byte, lenKeyBlock)
+		keyOffset := 0
+		if version < 6 {
+			keyBlock[0] = byte(cipherFunc)
+			keyOffset = 1
+		}
+		encodeChecksumKey(keyBlock[keyOffset:], key)
+	case PubKeyAlgoX25519, PubKeyAlgoX448:
+		// algorithm is added in plaintext below
+		keyBlock = key
+	}
+
+	switch pub.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		return serializeEncryptedKeyRSA(w, config.Random(), buf[:lenHeaderWritten], pub.PublicKey.(*rsa.PublicKey), keyBlock)
+	case PubKeyAlgoElGamal:
+		return serializeEncryptedKeyElGamal(w, config.Random(), buf[:lenHeaderWritten], pub.PublicKey.(*elgamal.PublicKey), keyBlock)
+	case PubKeyAlgoECDH:
+		return serializeEncryptedKeyECDH(w, config.Random(), buf[:lenHeaderWritten], pub.PublicKey.(*ecdh.PublicKey), keyBlock, pub.oid, pub.Fingerprint)
+	case PubKeyAlgoX25519:
+		return serializeEncryptedKeyX25519(w, config.Random(), buf[:lenHeaderWritten], pub.PublicKey.(*x25519.PublicKey), keyBlock, byte(cipherFunc), version)
+	case PubKeyAlgoX448:
+		return serializeEncryptedKeyX448(w, config.Random(), buf[:lenHeaderWritten], pub.PublicKey.(*x448.PublicKey), keyBlock, byte(cipherFunc), version)
+	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)))
+}
+
+// SerializeEncryptedKey serializes an encrypted key packet to w that contains
+// key, encrypted to pub.
+// PKESKv6 is used if config.AEAD() is not nil.
+// If config is nil, sensible defaults will be used.
+// Deprecated: Use SerializeEncryptedKeyAEAD instead.
+func SerializeEncryptedKey(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, key []byte, config *Config) error {
+	return SerializeEncryptedKeyAEAD(w, pub, cipherFunc, config.AEAD() != nil, key, config)
+}
+
+// SerializeEncryptedKeyWithHiddenOption serializes an encrypted key packet to w that contains
+// key, encrypted to pub. PKESKv6 is used if config.AEAD() is not nil.
+// The hidden option controls if the packet should be anonymous, i.e., omit key metadata.
+// If config is nil, sensible defaults will be used.
+// Deprecated: Use SerializeEncryptedKeyAEADwithHiddenOption instead.
+func SerializeEncryptedKeyWithHiddenOption(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, key []byte, hidden bool, config *Config) error {
+	return SerializeEncryptedKeyAEADwithHiddenOption(w, pub, cipherFunc, config.AEAD() != nil, key, hidden, config)
+}
+
+func serializeEncryptedKeyRSA(w io.Writer, rand io.Reader, header []byte, pub *rsa.PublicKey, keyBlock []byte) error {
+	cipherText, err := rsa.EncryptPKCS1v15(rand, pub, keyBlock)
+	if err != nil {
+		return errors.InvalidArgumentError("RSA encryption failed: " + err.Error())
+	}
+
+	cipherMPI := encoding.NewMPI(cipherText)
+	packetLen := len(header) /* header length */ + int(cipherMPI.EncodedLength())
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(cipherMPI.EncodedBytes())
+	return err
+}
+
+func serializeEncryptedKeyElGamal(w io.Writer, rand io.Reader, header []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 := len(header) /* header length */
+	packetLen += 2 /* mpi size */ + (c1.BitLen()+7)/8
+	packetLen += 2 /* mpi size */ + (c2.BitLen()+7)/8
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	if _, err = w.Write(new(encoding.MPI).SetBig(c1).EncodedBytes()); err != nil {
+		return err
+	}
+	_, err = w.Write(new(encoding.MPI).SetBig(c2).EncodedBytes())
+	return err
+}
+
+func serializeEncryptedKeyECDH(w io.Writer, rand io.Reader, header []byte, pub *ecdh.PublicKey, keyBlock []byte, oid encoding.Field, fingerprint []byte) error {
+	vsG, c, err := ecdh.Encrypt(rand, pub, keyBlock, oid.EncodedBytes(), fingerprint)
+	if err != nil {
+		return errors.InvalidArgumentError("ECDH encryption failed: " + err.Error())
+	}
+
+	g := encoding.NewMPI(vsG)
+	m := encoding.NewOID(c)
+
+	packetLen := len(header) /* header length */
+	packetLen += int(g.EncodedLength()) + int(m.EncodedLength())
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	if _, err = w.Write(g.EncodedBytes()); err != nil {
+		return err
+	}
+	_, err = w.Write(m.EncodedBytes())
+	return err
+}
+
+func serializeEncryptedKeyX25519(w io.Writer, rand io.Reader, header []byte, pub *x25519.PublicKey, keyBlock []byte, cipherFunc byte, version int) error {
+	ephemeralPublicX25519, ciphertext, err := x25519.Encrypt(rand, pub, keyBlock)
+	if err != nil {
+		return errors.InvalidArgumentError("x25519 encryption failed: " + err.Error())
+	}
+
+	packetLen := len(header) /* header length */
+	packetLen += x25519.EncodedFieldsLength(ciphertext, version == 6)
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	return x25519.EncodeFields(w, ephemeralPublicX25519, ciphertext, cipherFunc, version == 6)
+}
+
+func serializeEncryptedKeyX448(w io.Writer, rand io.Reader, header []byte, pub *x448.PublicKey, keyBlock []byte, cipherFunc byte, version int) error {
+	ephemeralPublicX448, ciphertext, err := x448.Encrypt(rand, pub, keyBlock)
+	if err != nil {
+		return errors.InvalidArgumentError("x448 encryption failed: " + err.Error())
+	}
+
+	packetLen := len(header) /* header length */
+	packetLen += x448.EncodedFieldsLength(ciphertext, version == 6)
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	return x448.EncodeFields(w, ephemeralPublicX448, ciphertext, cipherFunc, version == 6)
+}
+
+func checksumKeyMaterial(key []byte) uint16 {
+	var checksum uint16
+	for _, v := range key {
+		checksum += uint16(v)
+	}
+	return checksum
+}
+
+func decodeChecksumKey(msg []byte) (key []byte, err error) {
+	key = msg[:len(msg)-2]
+	expectedChecksum := uint16(msg[len(msg)-2])<<8 | uint16(msg[len(msg)-1])
+	checksum := checksumKeyMaterial(key)
+	if checksum != expectedChecksum {
+		err = errors.StructuralError("session key checksum is incorrect")
+	}
+	return
+}
+
+func encodeChecksumKey(buffer []byte, key []byte) {
+	copy(buffer, key)
+	checksum := checksumKeyMaterial(key)
+	buffer[len(key)] = byte(checksum >> 8)
+	buffer[len(key)+1] = byte(checksum)
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/literal.go

@@ -0,0 +1,91 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+// LiteralData represents an encrypted file. See RFC 4880, section 5.9.
+type LiteralData struct {
+	Format   uint8
+	IsBinary bool
+	FileName string
+	Time     uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
+	Body     io.Reader
+}
+
+// ForEyesOnly returns whether the contents of the LiteralData have been marked
+// as especially sensitive.
+func (l *LiteralData) ForEyesOnly() bool {
+	return l.FileName == "_CONSOLE"
+}
+
+func (l *LiteralData) parse(r io.Reader) (err error) {
+	var buf [256]byte
+
+	_, err = readFull(r, buf[:2])
+	if err != nil {
+		return
+	}
+
+	l.Format = buf[0]
+	l.IsBinary = l.Format == 'b'
+	fileNameLen := int(buf[1])
+
+	_, err = readFull(r, buf[:fileNameLen])
+	if err != nil {
+		return
+	}
+
+	l.FileName = string(buf[:fileNameLen])
+
+	_, err = readFull(r, buf[:4])
+	if err != nil {
+		return
+	}
+
+	l.Time = binary.BigEndian.Uint32(buf[:4])
+	l.Body = r
+	return
+}
+
+// SerializeLiteral serializes a literal data packet to w and returns a
+// WriteCloser to which the data itself can be written and which MUST be closed
+// on completion. The fileName is truncated to 255 bytes.
+func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uint32) (plaintext io.WriteCloser, err error) {
+	var buf [4]byte
+	buf[0] = 'b'
+	if !isBinary {
+		buf[0] = 'u'
+	}
+	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
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/marker.go

@@ -0,0 +1,33 @@
+package packet
+
+import (
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+type Marker struct{}
+
+const markerString = "PGP"
+
+// parse just checks if the packet contains "PGP".
+func (m *Marker) parse(reader io.Reader) error {
+	var buffer [3]byte
+	if _, err := io.ReadFull(reader, buffer[:]); err != nil {
+		return err
+	}
+	if string(buffer[:]) != markerString {
+		return errors.StructuralError("invalid marker packet")
+	}
+	return nil
+}
+
+// SerializeMarker writes a marker packet to writer.
+func SerializeMarker(writer io.Writer) error {
+	err := serializeHeader(writer, packetTypeMarker, len(markerString))
+	if err != nil {
+		return err
+	}
+	_, err = writer.Write([]byte(markerString))
+	return err
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/notation.go

@@ -0,0 +1,29 @@
+package packet
+
+// Notation type represents a Notation Data subpacket
+// see https://tools.ietf.org/html/rfc4880#section-5.2.3.16
+type Notation struct {
+	Name            string
+	Value           []byte
+	IsCritical      bool
+	IsHumanReadable bool
+}
+
+func (notation *Notation) getData() []byte {
+	nameData := []byte(notation.Name)
+	nameLen := len(nameData)
+	valueLen := len(notation.Value)
+
+	data := make([]byte, 8+nameLen+valueLen)
+	if notation.IsHumanReadable {
+		data[0] = 0x80
+	}
+
+	data[4] = byte(nameLen >> 8)
+	data[5] = byte(nameLen)
+	data[6] = byte(valueLen >> 8)
+	data[7] = byte(valueLen)
+	copy(data[8:8+nameLen], nameData)
+	copy(data[8+nameLen:], notation.Value)
+	return data
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/ocfb.go

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

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/one_pass_signature.go

@@ -0,0 +1,157 @@
+// 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"
+	"io"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
+)
+
+// OnePassSignature represents a one-pass signature packet. See RFC 4880,
+// section 5.4.
+type OnePassSignature struct {
+	Version        int
+	SigType        SignatureType
+	Hash           crypto.Hash
+	PubKeyAlgo     PublicKeyAlgorithm
+	KeyId          uint64
+	IsLast         bool
+	Salt           []byte // v6 only
+	KeyFingerprint []byte // v6 only
+}
+
+func (ops *OnePassSignature) parse(r io.Reader) (err error) {
+	var buf [8]byte
+	// Read: version | signature type | hash algorithm | public-key algorithm
+	_, err = readFull(r, buf[:4])
+	if err != nil {
+		return
+	}
+	if buf[0] != 3 && buf[0] != 6 {
+		return errors.UnsupportedError("one-pass-signature packet version " + strconv.Itoa(int(buf[0])))
+	}
+	ops.Version = int(buf[0])
+
+	var ok bool
+	ops.Hash, ok = algorithm.HashIdToHashWithSha1(buf[2])
+	if !ok {
+		return errors.UnsupportedError("hash function: " + strconv.Itoa(int(buf[2])))
+	}
+
+	ops.SigType = SignatureType(buf[1])
+	ops.PubKeyAlgo = PublicKeyAlgorithm(buf[3])
+
+	if ops.Version == 6 {
+		// Only for v6, a variable-length field containing the salt
+		_, err = readFull(r, buf[:1])
+		if err != nil {
+			return
+		}
+		saltLength := int(buf[0])
+		var expectedSaltLength int
+		expectedSaltLength, err = SaltLengthForHash(ops.Hash)
+		if err != nil {
+			return
+		}
+		if saltLength != expectedSaltLength {
+			err = errors.StructuralError("unexpected salt size for the given hash algorithm")
+			return
+		}
+		salt := make([]byte, expectedSaltLength)
+		_, err = readFull(r, salt)
+		if err != nil {
+			return
+		}
+		ops.Salt = salt
+
+		// Only for v6 packets, 32 octets of the fingerprint of the signing key.
+		fingerprint := make([]byte, 32)
+		_, err = readFull(r, fingerprint)
+		if err != nil {
+			return
+		}
+		ops.KeyFingerprint = fingerprint
+		ops.KeyId = binary.BigEndian.Uint64(ops.KeyFingerprint[:8])
+	} else {
+		_, err = readFull(r, buf[:8])
+		if err != nil {
+			return
+		}
+		ops.KeyId = binary.BigEndian.Uint64(buf[:8])
+	}
+
+	_, err = readFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	ops.IsLast = buf[0] != 0
+	return
+}
+
+// Serialize marshals the given OnePassSignature to w.
+func (ops *OnePassSignature) Serialize(w io.Writer) error {
+	//v3 length 1+1+1+1+8+1 =
+	packetLength := 13
+	if ops.Version == 6 {
+		// v6 length 1+1+1+1+1+len(salt)+32+1 =
+		packetLength = 38 + len(ops.Salt)
+	}
+
+	if err := serializeHeader(w, packetTypeOnePassSignature, packetLength); err != nil {
+		return err
+	}
+
+	var buf [8]byte
+	buf[0] = byte(ops.Version)
+	buf[1] = uint8(ops.SigType)
+	var ok bool
+	buf[2], ok = algorithm.HashToHashIdWithSha1(ops.Hash)
+	if !ok {
+		return errors.UnsupportedError("hash type: " + strconv.Itoa(int(ops.Hash)))
+	}
+	buf[3] = uint8(ops.PubKeyAlgo)
+
+	_, err := w.Write(buf[:4])
+	if err != nil {
+		return err
+	}
+
+	if ops.Version == 6 {
+		// write salt for v6 signatures
+		_, err := w.Write([]byte{uint8(len(ops.Salt))})
+		if err != nil {
+			return err
+		}
+		_, err = w.Write(ops.Salt)
+		if err != nil {
+			return err
+		}
+
+		// write fingerprint v6 signatures
+		_, err = w.Write(ops.KeyFingerprint)
+		if err != nil {
+			return err
+		}
+	} else {
+		binary.BigEndian.PutUint64(buf[:8], ops.KeyId)
+		_, err := w.Write(buf[:8])
+		if err != nil {
+			return err
+		}
+	}
+
+	isLast := []byte{byte(0)}
+	if ops.IsLast {
+		isLast[0] = 1
+	}
+
+	_, err = w.Write(isLast)
+	return err
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/opaque.go

@@ -0,0 +1,170 @@
+// 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"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is
+// useful for splitting and storing the original packet contents separately,
+// handling unsupported packet types or accessing parts of the packet not yet
+// implemented by this package.
+type OpaquePacket struct {
+	// Packet type
+	Tag uint8
+	// Reason why the packet was parsed opaquely
+	Reason error
+	// Binary contents of the packet data
+	Contents []byte
+}
+
+func (op *OpaquePacket) parse(r io.Reader) (err error) {
+	op.Contents, err = io.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
+	EncodedLength []byte // Store the original encoded length for signature verifications.
+	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
+	var encodedLength []byte
+	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
+		}
+		encodedLength = contents[0:1]
+		subLen = uint32(contents[0])
+		contents = contents[1:]
+	case contents[0] < 255:
+		subHeaderLen = 3 // 2 length bytes, 1 subtype
+		if len(contents) < subHeaderLen {
+			goto Truncated
+		}
+		encodedLength = contents[0:2]
+		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
+		}
+		encodedLength = contents[0:5]
+		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.EncodedLength = encodedLength
+	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)
+	copy(buf, osp.EncodedLength)
+	n := len(osp.EncodedLength)
+
+	buf[n] = osp.SubType
+	if _, err = w.Write(buf[:n+1]); err != nil {
+		return
+	}
+	_, err = w.Write(osp.Contents)
+	return
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/packet.go

@@ -0,0 +1,675 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package packet implements parsing and serialization of OpenPGP packets, as
+// specified in RFC 4880.
+package packet // import "github.com/ProtonMail/go-crypto/openpgp/packet"
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/rsa"
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"github.com/ProtonMail/go-crypto/openpgp/internal/algorithm"
+)
+
+// readFull is the same as io.ReadFull except that reading zero bytes returns
+// ErrUnexpectedEOF rather than EOF.
+func readFull(r io.Reader, buf []byte) (n int, err error) {
+	n, err = io.ReadFull(r, buf)
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// readLength reads an OpenPGP length from r. See RFC 4880, section 4.2.2.
+func readLength(r io.Reader) (length int64, isPartial bool, err error) {
+	var buf [4]byte
+	_, err = readFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	switch {
+	case buf[0] < 192:
+		length = int64(buf[0])
+	case buf[0] < 224:
+		length = int64(buf[0]-192) << 8
+		_, err = readFull(r, buf[0:1])
+		if err != nil {
+			return
+		}
+		length += int64(buf[0]) + 192
+	case buf[0] < 255:
+		length = int64(1) << (buf[0] & 0x1f)
+		isPartial = true
+	default:
+		_, err = readFull(r, buf[0:4])
+		if err != nil {
+			return
+		}
+		length = int64(buf[0])<<24 |
+			int64(buf[1])<<16 |
+			int64(buf[2])<<8 |
+			int64(buf[3])
+	}
+	return
+}
+
+// partialLengthReader wraps an io.Reader and handles OpenPGP partial lengths.
+// The continuation lengths are parsed and removed from the stream and EOF is
+// returned at the end of the packet. See RFC 4880, section 4.2.2.4.
+type partialLengthReader struct {
+	r         io.Reader
+	remaining int64
+	isPartial bool
+}
+
+func (r *partialLengthReader) Read(p []byte) (n int, err error) {
+	for r.remaining == 0 {
+		if !r.isPartial {
+			return 0, io.EOF
+		}
+		r.remaining, r.isPartial, err = readLength(r.r)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	toRead := int64(len(p))
+	if toRead > r.remaining {
+		toRead = r.remaining
+	}
+
+	n, err = r.r.Read(p[:int(toRead)])
+	r.remaining -= int64(n)
+	if n < int(toRead) && err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// partialLengthWriter writes a stream of data using OpenPGP partial lengths.
+// See RFC 4880, section 4.2.2.4.
+type partialLengthWriter struct {
+	w          io.WriteCloser
+	buf        bytes.Buffer
+	lengthByte [1]byte
+}
+
+func (w *partialLengthWriter) Write(p []byte) (n int, err error) {
+	bufLen := w.buf.Len()
+	if bufLen > 512 {
+		for power := uint(30); ; power-- {
+			l := 1 << power
+			if bufLen >= l {
+				w.lengthByte[0] = 224 + uint8(power)
+				_, err = w.w.Write(w.lengthByte[:])
+				if err != nil {
+					return
+				}
+				var m int
+				m, err = w.w.Write(w.buf.Next(l))
+				if err != nil {
+					return
+				}
+				if m != l {
+					return 0, io.ErrShortWrite
+				}
+				break
+			}
+		}
+	}
+	return w.buf.Write(p)
+}
+
+func (w *partialLengthWriter) Close() (err error) {
+	len := w.buf.Len()
+	err = serializeLength(w.w, len)
+	if err != nil {
+		return err
+	}
+	_, err = w.buf.WriteTo(w.w)
+	if err != nil {
+		return err
+	}
+	return w.w.Close()
+}
+
+// A spanReader is an io.LimitReader, but it returns ErrUnexpectedEOF if the
+// underlying Reader returns EOF before the limit has been reached.
+type spanReader struct {
+	r io.Reader
+	n int64
+}
+
+func (l *spanReader) Read(p []byte) (n int, err error) {
+	if l.n <= 0 {
+		return 0, io.EOF
+	}
+	if int64(len(p)) > l.n {
+		p = p[0:l.n]
+	}
+	n, err = l.r.Read(p)
+	l.n -= int64(n)
+	if l.n > 0 && err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// readHeader parses a packet header and returns an io.Reader which will return
+// the contents of the packet. See RFC 4880, section 4.2.
+func readHeader(r io.Reader) (tag packetType, length int64, contents io.Reader, err error) {
+	var buf [4]byte
+	_, err = io.ReadFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	if buf[0]&0x80 == 0 {
+		err = errors.StructuralError("tag byte does not have MSB set")
+		return
+	}
+	if buf[0]&0x40 == 0 {
+		// Old format packet
+		tag = packetType((buf[0] & 0x3f) >> 2)
+		lengthType := buf[0] & 3
+		if lengthType == 3 {
+			length = -1
+			contents = r
+			return
+		}
+		lengthBytes := 1 << lengthType
+		_, err = readFull(r, buf[0:lengthBytes])
+		if err != nil {
+			return
+		}
+		for i := 0; i < lengthBytes; i++ {
+			length <<= 8
+			length |= int64(buf[i])
+		}
+		contents = &spanReader{r, length}
+		return
+	}
+
+	// New format packet
+	tag = packetType(buf[0] & 0x3f)
+	length, isPartial, err := readLength(r)
+	if err != nil {
+		return
+	}
+	if isPartial {
+		contents = &partialLengthReader{
+			remaining: length,
+			isPartial: true,
+			r:         r,
+		}
+		length = -1
+	} else {
+		contents = &spanReader{r, length}
+	}
+	return
+}
+
+// serializeHeader writes an OpenPGP packet header to w. See RFC 4880, section
+// 4.2.
+func serializeHeader(w io.Writer, ptype packetType, length int) (err error) {
+	err = serializeType(w, ptype)
+	if err != nil {
+		return
+	}
+	return serializeLength(w, length)
+}
+
+// serializeType writes an OpenPGP packet type to w. See RFC 4880, section
+// 4.2.
+func serializeType(w io.Writer, ptype packetType) (err error) {
+	var buf [1]byte
+	buf[0] = 0x80 | 0x40 | byte(ptype)
+	_, err = w.Write(buf[:])
+	return
+}
+
+// serializeLength writes an OpenPGP packet length to w. See RFC 4880, section
+// 4.2.2.
+func serializeLength(w io.Writer, length int) (err error) {
+	var buf [5]byte
+	var n int
+
+	if length < 192 {
+		buf[0] = byte(length)
+		n = 1
+	} else if length < 8384 {
+		length -= 192
+		buf[0] = 192 + byte(length>>8)
+		buf[1] = byte(length)
+		n = 2
+	} else {
+		buf[0] = 255
+		buf[1] = byte(length >> 24)
+		buf[2] = byte(length >> 16)
+		buf[3] = byte(length >> 8)
+		buf[4] = byte(length)
+		n = 5
+	}
+
+	_, err = w.Write(buf[:n])
+	return
+}
+
+// serializeStreamHeader writes an OpenPGP packet header to w where the
+// length of the packet is unknown. It returns a io.WriteCloser which can be
+// used to write the contents of the packet. See RFC 4880, section 4.2.
+func serializeStreamHeader(w io.WriteCloser, ptype packetType) (out io.WriteCloser, err error) {
+	err = serializeType(w, ptype)
+	if err != nil {
+		return
+	}
+	out = &partialLengthWriter{w: w}
+	return
+}
+
+// Packet represents an OpenPGP packet. Users are expected to try casting
+// instances of this interface to specific packet types.
+type Packet interface {
+	parse(io.Reader) error
+}
+
+// consumeAll reads from the given Reader until error, returning the number of
+// bytes read.
+func consumeAll(r io.Reader) (n int64, err error) {
+	var m int
+	var buf [1024]byte
+
+	for {
+		m, err = r.Read(buf[:])
+		n += int64(m)
+		if err == io.EOF {
+			err = nil
+			return
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+// packetType represents the numeric ids of the different OpenPGP packet types. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-2
+type packetType uint8
+
+const (
+	packetTypeEncryptedKey                             packetType = 1
+	packetTypeSignature                                packetType = 2
+	packetTypeSymmetricKeyEncrypted                    packetType = 3
+	packetTypeOnePassSignature                         packetType = 4
+	packetTypePrivateKey                               packetType = 5
+	packetTypePublicKey                                packetType = 6
+	packetTypePrivateSubkey                            packetType = 7
+	packetTypeCompressed                               packetType = 8
+	packetTypeSymmetricallyEncrypted                   packetType = 9
+	packetTypeMarker                                   packetType = 10
+	packetTypeLiteralData                              packetType = 11
+	packetTypeTrust                                    packetType = 12
+	packetTypeUserId                                   packetType = 13
+	packetTypePublicSubkey                             packetType = 14
+	packetTypeUserAttribute                            packetType = 17
+	packetTypeSymmetricallyEncryptedIntegrityProtected packetType = 18
+	packetTypeAEADEncrypted                            packetType = 20
+	packetPadding                                      packetType = 21
+)
+
+// EncryptedDataPacket holds encrypted data. It is currently implemented by
+// SymmetricallyEncrypted and AEADEncrypted.
+type EncryptedDataPacket interface {
+	Decrypt(CipherFunction, []byte) (io.ReadCloser, error)
+}
+
+// Read reads a single OpenPGP packet from the given io.Reader. If there is an
+// error parsing a packet, the whole packet is consumed from the input.
+func Read(r io.Reader) (p Packet, err error) {
+	tag, len, contents, err := readHeader(r)
+	if err != nil {
+		return
+	}
+
+	switch tag {
+	case packetTypeEncryptedKey:
+		p = new(EncryptedKey)
+	case packetTypeSignature:
+		p = new(Signature)
+	case packetTypeSymmetricKeyEncrypted:
+		p = new(SymmetricKeyEncrypted)
+	case packetTypeOnePassSignature:
+		p = new(OnePassSignature)
+	case packetTypePrivateKey, packetTypePrivateSubkey:
+		pk := new(PrivateKey)
+		if tag == packetTypePrivateSubkey {
+			pk.IsSubkey = true
+		}
+		p = pk
+	case packetTypePublicKey, packetTypePublicSubkey:
+		isSubkey := tag == packetTypePublicSubkey
+		p = &PublicKey{IsSubkey: isSubkey}
+	case packetTypeCompressed:
+		p = new(Compressed)
+	case packetTypeSymmetricallyEncrypted:
+		p = new(SymmetricallyEncrypted)
+	case packetTypeLiteralData:
+		p = new(LiteralData)
+	case packetTypeUserId:
+		p = new(UserId)
+	case packetTypeUserAttribute:
+		p = new(UserAttribute)
+	case packetTypeSymmetricallyEncryptedIntegrityProtected:
+		se := new(SymmetricallyEncrypted)
+		se.IntegrityProtected = true
+		p = se
+	case packetTypeAEADEncrypted:
+		p = new(AEADEncrypted)
+	case packetPadding:
+		p = Padding(len)
+	case packetTypeMarker:
+		p = new(Marker)
+	case packetTypeTrust:
+		// Not implemented, just consume
+		err = errors.UnknownPacketTypeError(tag)
+	default:
+		// Packet Tags from 0 to 39 are critical.
+		// Packet Tags from 40 to 63 are non-critical.
+		if tag < 40 {
+			err = errors.CriticalUnknownPacketTypeError(tag)
+		} else {
+			err = errors.UnknownPacketTypeError(tag)
+		}
+	}
+	if p != nil {
+		err = p.parse(contents)
+	}
+	if err != nil {
+		consumeAll(contents)
+	}
+	return
+}
+
+// ReadWithCheck reads a single OpenPGP message packet from the given io.Reader. If there is an
+// error parsing a packet, the whole packet is consumed from the input.
+// ReadWithCheck additionally checks if the OpenPGP message packet sequence adheres
+// to the packet composition rules in rfc4880, if not throws an error.
+func ReadWithCheck(r io.Reader, sequence *SequenceVerifier) (p Packet, msgErr error, err error) {
+	tag, len, contents, err := readHeader(r)
+	if err != nil {
+		return
+	}
+	switch tag {
+	case packetTypeEncryptedKey:
+		msgErr = sequence.Next(ESKSymbol)
+		p = new(EncryptedKey)
+	case packetTypeSignature:
+		msgErr = sequence.Next(SigSymbol)
+		p = new(Signature)
+	case packetTypeSymmetricKeyEncrypted:
+		msgErr = sequence.Next(ESKSymbol)
+		p = new(SymmetricKeyEncrypted)
+	case packetTypeOnePassSignature:
+		msgErr = sequence.Next(OPSSymbol)
+		p = new(OnePassSignature)
+	case packetTypeCompressed:
+		msgErr = sequence.Next(CompSymbol)
+		p = new(Compressed)
+	case packetTypeSymmetricallyEncrypted:
+		msgErr = sequence.Next(EncSymbol)
+		p = new(SymmetricallyEncrypted)
+	case packetTypeLiteralData:
+		msgErr = sequence.Next(LDSymbol)
+		p = new(LiteralData)
+	case packetTypeSymmetricallyEncryptedIntegrityProtected:
+		msgErr = sequence.Next(EncSymbol)
+		se := new(SymmetricallyEncrypted)
+		se.IntegrityProtected = true
+		p = se
+	case packetTypeAEADEncrypted:
+		msgErr = sequence.Next(EncSymbol)
+		p = new(AEADEncrypted)
+	case packetPadding:
+		p = Padding(len)
+	case packetTypeMarker:
+		p = new(Marker)
+	case packetTypeTrust:
+		// Not implemented, just consume
+		err = errors.UnknownPacketTypeError(tag)
+	case packetTypePrivateKey,
+		packetTypePrivateSubkey,
+		packetTypePublicKey,
+		packetTypePublicSubkey,
+		packetTypeUserId,
+		packetTypeUserAttribute:
+		msgErr = sequence.Next(UnknownSymbol)
+		consumeAll(contents)
+	default:
+		// Packet Tags from 0 to 39 are critical.
+		// Packet Tags from 40 to 63 are non-critical.
+		if tag < 40 {
+			err = errors.CriticalUnknownPacketTypeError(tag)
+		} else {
+			err = errors.UnknownPacketTypeError(tag)
+		}
+	}
+	if p != nil {
+		err = p.parse(contents)
+	}
+	if err != nil {
+		consumeAll(contents)
+	}
+	return
+}
+
+// SignatureType represents the different semantic meanings of an OpenPGP
+// signature. See RFC 4880, section 5.2.1.
+type SignatureType uint8
+
+const (
+	SigTypeBinary                  SignatureType = 0x00
+	SigTypeText                    SignatureType = 0x01
+	SigTypeGenericCert             SignatureType = 0x10
+	SigTypePersonaCert             SignatureType = 0x11
+	SigTypeCasualCert              SignatureType = 0x12
+	SigTypePositiveCert            SignatureType = 0x13
+	SigTypeSubkeyBinding           SignatureType = 0x18
+	SigTypePrimaryKeyBinding       SignatureType = 0x19
+	SigTypeDirectSignature         SignatureType = 0x1F
+	SigTypeKeyRevocation           SignatureType = 0x20
+	SigTypeSubkeyRevocation        SignatureType = 0x28
+	SigTypeCertificationRevocation SignatureType = 0x30
+)
+
+// PublicKeyAlgorithm represents the different public key system specified for
+// OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-12
+type PublicKeyAlgorithm uint8
+
+const (
+	PubKeyAlgoRSA     PublicKeyAlgorithm = 1
+	PubKeyAlgoElGamal PublicKeyAlgorithm = 16
+	PubKeyAlgoDSA     PublicKeyAlgorithm = 17
+	// RFC 6637, Section 5.
+	PubKeyAlgoECDH  PublicKeyAlgorithm = 18
+	PubKeyAlgoECDSA PublicKeyAlgorithm = 19
+	// https://www.ietf.org/archive/id/draft-koch-eddsa-for-openpgp-04.txt
+	PubKeyAlgoEdDSA PublicKeyAlgorithm = 22
+	// https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh
+	PubKeyAlgoX25519  PublicKeyAlgorithm = 25
+	PubKeyAlgoX448    PublicKeyAlgorithm = 26
+	PubKeyAlgoEd25519 PublicKeyAlgorithm = 27
+	PubKeyAlgoEd448   PublicKeyAlgorithm = 28
+
+	// Deprecated in RFC 4880, Section 13.5. Use key flags instead.
+	PubKeyAlgoRSAEncryptOnly PublicKeyAlgorithm = 2
+	PubKeyAlgoRSASignOnly    PublicKeyAlgorithm = 3
+)
+
+// CanEncrypt returns true if it's possible to encrypt a message to a public
+// key of the given type.
+func (pka PublicKeyAlgorithm) CanEncrypt() bool {
+	switch pka {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal, PubKeyAlgoECDH, PubKeyAlgoX25519, PubKeyAlgoX448:
+		return true
+	}
+	return false
+}
+
+// CanSign returns true if it's possible for a public key of the given type to
+// sign a message.
+func (pka PublicKeyAlgorithm) CanSign() bool {
+	switch pka {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA, PubKeyAlgoEdDSA, PubKeyAlgoEd25519, PubKeyAlgoEd448:
+		return true
+	}
+	return false
+}
+
+// CipherFunction represents the different block ciphers specified for OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-13
+type CipherFunction algorithm.CipherFunction
+
+const (
+	Cipher3DES   CipherFunction = 2
+	CipherCAST5  CipherFunction = 3
+	CipherAES128 CipherFunction = 7
+	CipherAES192 CipherFunction = 8
+	CipherAES256 CipherFunction = 9
+)
+
+// KeySize returns the key size, in bytes, of cipher.
+func (cipher CipherFunction) KeySize() int {
+	return algorithm.CipherFunction(cipher).KeySize()
+}
+
+// IsSupported returns true if the cipher is supported from the library
+func (cipher CipherFunction) IsSupported() bool {
+	return algorithm.CipherFunction(cipher).KeySize() > 0
+}
+
+// blockSize returns the block size, in bytes, of cipher.
+func (cipher CipherFunction) blockSize() int {
+	return algorithm.CipherFunction(cipher).BlockSize()
+}
+
+// new returns a fresh instance of the given cipher.
+func (cipher CipherFunction) new(key []byte) (block cipher.Block) {
+	return algorithm.CipherFunction(cipher).New(key)
+}
+
+// padToKeySize left-pads a MPI with zeroes to match the length of the
+// specified RSA public.
+func padToKeySize(pub *rsa.PublicKey, b []byte) []byte {
+	k := (pub.N.BitLen() + 7) / 8
+	if len(b) >= k {
+		return b
+	}
+	bb := make([]byte, k)
+	copy(bb[len(bb)-len(b):], b)
+	return bb
+}
+
+// CompressionAlgo Represents the different compression algorithms
+// supported by OpenPGP (except for BZIP2, which is not currently
+// supported). See Section 9.3 of RFC 4880.
+type CompressionAlgo uint8
+
+const (
+	CompressionNone CompressionAlgo = 0
+	CompressionZIP  CompressionAlgo = 1
+	CompressionZLIB CompressionAlgo = 2
+)
+
+// AEADMode represents the different Authenticated Encryption with Associated
+// Data specified for OpenPGP.
+// See https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#section-9.6
+type AEADMode algorithm.AEADMode
+
+const (
+	AEADModeEAX AEADMode = 1
+	AEADModeOCB AEADMode = 2
+	AEADModeGCM AEADMode = 3
+)
+
+func (mode AEADMode) IvLength() int {
+	return algorithm.AEADMode(mode).NonceLength()
+}
+
+func (mode AEADMode) TagLength() int {
+	return algorithm.AEADMode(mode).TagLength()
+}
+
+// IsSupported returns true if the aead mode is supported from the library
+func (mode AEADMode) IsSupported() bool {
+	return algorithm.AEADMode(mode).TagLength() > 0
+}
+
+// new returns a fresh instance of the given mode.
+func (mode AEADMode) new(block cipher.Block) cipher.AEAD {
+	return algorithm.AEADMode(mode).New(block)
+}
+
+// ReasonForRevocation represents a revocation reason code as per RFC4880
+// section 5.2.3.23.
+type ReasonForRevocation uint8
+
+const (
+	NoReason       ReasonForRevocation = 0
+	KeySuperseded  ReasonForRevocation = 1
+	KeyCompromised ReasonForRevocation = 2
+	KeyRetired     ReasonForRevocation = 3
+	UserIDNotValid ReasonForRevocation = 32
+	Unknown        ReasonForRevocation = 200
+)
+
+func NewReasonForRevocation(value byte) ReasonForRevocation {
+	if value < 4 || value == 32 {
+		return ReasonForRevocation(value)
+	}
+	return Unknown
+}
+
+// Curve is a mapping to supported ECC curves for key generation.
+// See https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-06.html#name-curve-specific-wire-formats
+type Curve string
+
+const (
+	Curve25519         Curve = "Curve25519"
+	Curve448           Curve = "Curve448"
+	CurveNistP256      Curve = "P256"
+	CurveNistP384      Curve = "P384"
+	CurveNistP521      Curve = "P521"
+	CurveSecP256k1     Curve = "SecP256k1"
+	CurveBrainpoolP256 Curve = "BrainpoolP256"
+	CurveBrainpoolP384 Curve = "BrainpoolP384"
+	CurveBrainpoolP512 Curve = "BrainpoolP512"
+)
+
+// TrustLevel represents a trust level per RFC4880 5.2.3.13
+type TrustLevel uint8
+
+// TrustAmount represents a trust amount per RFC4880 5.2.3.13
+type TrustAmount uint8
+
+const (
+	// versionSize is the length in bytes of the version value.
+	versionSize = 1
+	// algorithmSize is the length in bytes of the key algorithm value.
+	algorithmSize = 1
+	// keyVersionSize is the length in bytes of the key version value
+	keyVersionSize = 1
+	// keyIdSize is the length in bytes of the key identifier value.
+	keyIdSize = 8
+	// timestampSize is the length in bytes of encoded timestamps.
+	timestampSize = 4
+	// fingerprintSizeV6 is the length in bytes of the key fingerprint in v6.
+	fingerprintSizeV6 = 32
+	// fingerprintSize is the length in bytes of the key fingerprint.
+	fingerprintSize = 20
+)

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/packet_sequence.go

@@ -0,0 +1,222 @@
+package packet
+
+// This file implements the pushdown automata (PDA) from PGPainless (Paul Schaub)
+// to verify pgp packet sequences. See Paul's blogpost for more details:
+// https://blog.jabberhead.tk/2022/10/26/implementing-packet-sequence-validation-using-pushdown-automata/
+import (
+	"fmt"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+func NewErrMalformedMessage(from State, input InputSymbol, stackSymbol StackSymbol) errors.ErrMalformedMessage {
+	return errors.ErrMalformedMessage(fmt.Sprintf("state %d, input symbol %d, stack symbol %d ", from, input, stackSymbol))
+}
+
+// InputSymbol defines the input alphabet of the PDA
+type InputSymbol uint8
+
+const (
+	LDSymbol InputSymbol = iota
+	SigSymbol
+	OPSSymbol
+	CompSymbol
+	ESKSymbol
+	EncSymbol
+	EOSSymbol
+	UnknownSymbol
+)
+
+// StackSymbol defines the stack alphabet of the PDA
+type StackSymbol int8
+
+const (
+	MsgStackSymbol StackSymbol = iota
+	OpsStackSymbol
+	KeyStackSymbol
+	EndStackSymbol
+	EmptyStackSymbol
+)
+
+// State defines the states of the PDA
+type State int8
+
+const (
+	OpenPGPMessage State = iota
+	ESKMessage
+	LiteralMessage
+	CompressedMessage
+	EncryptedMessage
+	ValidMessage
+)
+
+// transition represents a state transition in the PDA
+type transition func(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error)
+
+// SequenceVerifier is a pushdown automata to verify
+// PGP messages packet sequences according to rfc4880.
+type SequenceVerifier struct {
+	stack []StackSymbol
+	state State
+}
+
+// Next performs a state transition with the given input symbol.
+// If the transition fails a ErrMalformedMessage is returned.
+func (sv *SequenceVerifier) Next(input InputSymbol) error {
+	for {
+		stackSymbol := sv.popStack()
+		transitionFunc := getTransition(sv.state)
+		nextState, newStackSymbols, redo, err := transitionFunc(input, stackSymbol)
+		if err != nil {
+			return err
+		}
+		if redo {
+			sv.pushStack(stackSymbol)
+		}
+		for _, newStackSymbol := range newStackSymbols {
+			sv.pushStack(newStackSymbol)
+		}
+		sv.state = nextState
+		if !redo {
+			break
+		}
+	}
+	return nil
+}
+
+// Valid returns true if RDA is in a valid state.
+func (sv *SequenceVerifier) Valid() bool {
+	return sv.state == ValidMessage && len(sv.stack) == 0
+}
+
+func (sv *SequenceVerifier) AssertValid() error {
+	if !sv.Valid() {
+		return errors.ErrMalformedMessage("invalid message")
+	}
+	return nil
+}
+
+func NewSequenceVerifier() *SequenceVerifier {
+	return &SequenceVerifier{
+		stack: []StackSymbol{EndStackSymbol, MsgStackSymbol},
+		state: OpenPGPMessage,
+	}
+}
+
+func (sv *SequenceVerifier) popStack() StackSymbol {
+	if len(sv.stack) == 0 {
+		return EmptyStackSymbol
+	}
+	elemIndex := len(sv.stack) - 1
+	stackSymbol := sv.stack[elemIndex]
+	sv.stack = sv.stack[:elemIndex]
+	return stackSymbol
+}
+
+func (sv *SequenceVerifier) pushStack(stackSymbol StackSymbol) {
+	sv.stack = append(sv.stack, stackSymbol)
+}
+
+func getTransition(from State) transition {
+	switch from {
+	case OpenPGPMessage:
+		return fromOpenPGPMessage
+	case LiteralMessage:
+		return fromLiteralMessage
+	case CompressedMessage:
+		return fromCompressedMessage
+	case EncryptedMessage:
+		return fromEncryptedMessage
+	case ESKMessage:
+		return fromESKMessage
+	case ValidMessage:
+		return fromValidMessage
+	}
+	return nil
+}
+
+// fromOpenPGPMessage is the transition for the state OpenPGPMessage.
+func fromOpenPGPMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	if stackSymbol != MsgStackSymbol {
+		return 0, nil, false, NewErrMalformedMessage(OpenPGPMessage, input, stackSymbol)
+	}
+	switch input {
+	case LDSymbol:
+		return LiteralMessage, nil, false, nil
+	case SigSymbol:
+		return OpenPGPMessage, []StackSymbol{MsgStackSymbol}, false, nil
+	case OPSSymbol:
+		return OpenPGPMessage, []StackSymbol{OpsStackSymbol, MsgStackSymbol}, false, nil
+	case CompSymbol:
+		return CompressedMessage, nil, false, nil
+	case ESKSymbol:
+		return ESKMessage, []StackSymbol{KeyStackSymbol}, false, nil
+	case EncSymbol:
+		return EncryptedMessage, nil, false, nil
+	}
+	return 0, nil, false, NewErrMalformedMessage(OpenPGPMessage, input, stackSymbol)
+}
+
+// fromESKMessage is the transition for the state ESKMessage.
+func fromESKMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	if stackSymbol != KeyStackSymbol {
+		return 0, nil, false, NewErrMalformedMessage(ESKMessage, input, stackSymbol)
+	}
+	switch input {
+	case ESKSymbol:
+		return ESKMessage, []StackSymbol{KeyStackSymbol}, false, nil
+	case EncSymbol:
+		return EncryptedMessage, nil, false, nil
+	}
+	return 0, nil, false, NewErrMalformedMessage(ESKMessage, input, stackSymbol)
+}
+
+// fromLiteralMessage is the transition for the state LiteralMessage.
+func fromLiteralMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	switch input {
+	case SigSymbol:
+		if stackSymbol == OpsStackSymbol {
+			return LiteralMessage, nil, false, nil
+		}
+	case EOSSymbol:
+		if stackSymbol == EndStackSymbol {
+			return ValidMessage, nil, false, nil
+		}
+	}
+	return 0, nil, false, NewErrMalformedMessage(LiteralMessage, input, stackSymbol)
+}
+
+// fromLiteralMessage is the transition for the state CompressedMessage.
+func fromCompressedMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	switch input {
+	case SigSymbol:
+		if stackSymbol == OpsStackSymbol {
+			return CompressedMessage, nil, false, nil
+		}
+	case EOSSymbol:
+		if stackSymbol == EndStackSymbol {
+			return ValidMessage, nil, false, nil
+		}
+	}
+	return OpenPGPMessage, []StackSymbol{MsgStackSymbol}, true, nil
+}
+
+// fromEncryptedMessage is the transition for the state EncryptedMessage.
+func fromEncryptedMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	switch input {
+	case SigSymbol:
+		if stackSymbol == OpsStackSymbol {
+			return EncryptedMessage, nil, false, nil
+		}
+	case EOSSymbol:
+		if stackSymbol == EndStackSymbol {
+			return ValidMessage, nil, false, nil
+		}
+	}
+	return OpenPGPMessage, []StackSymbol{MsgStackSymbol}, true, nil
+}
+
+// fromValidMessage is the transition for the state ValidMessage.
+func fromValidMessage(input InputSymbol, stackSymbol StackSymbol) (State, []StackSymbol, bool, error) {
+	return 0, nil, false, NewErrMalformedMessage(ValidMessage, input, stackSymbol)
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/packet_unsupported.go

@@ -0,0 +1,24 @@
+package packet
+
+import (
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+// UnsupportedPackage represents a OpenPGP packet with a known packet type
+// but with unsupported content.
+type UnsupportedPacket struct {
+	IncompletePacket Packet
+	Error            errors.UnsupportedError
+}
+
+// Implements the Packet interface
+func (up *UnsupportedPacket) parse(read io.Reader) error {
+	err := up.IncompletePacket.parse(read)
+	if castedErr, ok := err.(errors.UnsupportedError); ok {
+		up.Error = castedErr
+		return nil
+	}
+	return err
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/padding.go

@@ -0,0 +1,26 @@
+package packet
+
+import (
+	"io"
+)
+
+// Padding type represents a Padding Packet (Tag 21).
+// The padding type is represented by the length of its padding.
+// see https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh#name-padding-packet-tag-21
+type Padding int
+
+// parse just ignores the padding content.
+func (pad Padding) parse(reader io.Reader) error {
+	_, err := io.CopyN(io.Discard, reader, int64(pad))
+	return err
+}
+
+// SerializePadding writes the padding to writer.
+func (pad Padding) SerializePadding(writer io.Writer, rand io.Reader) error {
+	err := serializeHeader(writer, packetPadding, int(pad))
+	if err != nil {
+		return err
+	}
+	_, err = io.CopyN(writer, rand, int64(pad))
+	return err
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/private_key_test_data.go

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

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/public_key_test_data.go

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

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/reader.go

@@ -0,0 +1,209 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+type PacketReader interface {
+	Next() (p Packet, err error)
+	Push(reader io.Reader) (err error)
+	Unread(p Packet)
+}
+
+// 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/unsupported/Marker packet types are skipped.
+func (r *Reader) Next() (p Packet, err error) {
+	for {
+		p, err := r.read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			if _, ok := err.(errors.UnknownPacketTypeError); ok {
+				continue
+			}
+			if _, ok := err.(errors.UnsupportedError); ok {
+				switch p.(type) {
+				case *SymmetricallyEncrypted, *AEADEncrypted, *Compressed, *LiteralData:
+					return nil, err
+				}
+				continue
+			}
+			return nil, err
+		} else {
+			//A marker packet MUST be ignored when received
+			switch p.(type) {
+			case *Marker:
+				continue
+			}
+			return p, nil
+		}
+	}
+	return nil, io.EOF
+}
+
+// Next returns the most recently unread Packet, or reads another packet from
+// the top-most io.Reader. Unknown/Marker packet types are skipped while unsupported
+// packets are returned as UnsupportedPacket type.
+func (r *Reader) NextWithUnsupported() (p Packet, err error) {
+	for {
+		p, err = r.read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			if _, ok := err.(errors.UnknownPacketTypeError); ok {
+				continue
+			}
+			if casteErr, ok := err.(errors.UnsupportedError); ok {
+				return &UnsupportedPacket{
+					IncompletePacket: p,
+					Error:            casteErr,
+				}, nil
+			}
+			return
+		} else {
+			//A marker packet MUST be ignored when received
+			switch p.(type) {
+			case *Marker:
+				continue
+			}
+			return
+		}
+	}
+	return nil, io.EOF
+}
+
+func (r *Reader) read() (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 == io.EOF {
+			r.readers = r.readers[:len(r.readers)-1]
+			continue
+		}
+		return p, 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},
+	}
+}
+
+// CheckReader is similar to Reader but additionally
+// uses the pushdown automata to verify the read packet sequence.
+type CheckReader struct {
+	Reader
+	verifier  *SequenceVerifier
+	fullyRead bool
+}
+
+// Next returns the most recently unread Packet, or reads another packet from
+// the top-most io.Reader. Unknown packet types are skipped.
+// If the read packet sequence does not conform to the packet composition
+// rules in rfc4880, it returns an error.
+func (r *CheckReader) Next() (p Packet, err error) {
+	if r.fullyRead {
+		return nil, io.EOF
+	}
+	if len(r.q) > 0 {
+		p = r.q[len(r.q)-1]
+		r.q = r.q[:len(r.q)-1]
+		return
+	}
+	var errMsg error
+	for len(r.readers) > 0 {
+		p, errMsg, err = ReadWithCheck(r.readers[len(r.readers)-1], r.verifier)
+		if errMsg != nil {
+			err = errMsg
+			return
+		}
+		if err == nil {
+			return
+		}
+		if err == io.EOF {
+			r.readers = r.readers[:len(r.readers)-1]
+			continue
+		}
+		//A marker packet MUST be ignored when received
+		switch p.(type) {
+		case *Marker:
+			continue
+		}
+		if _, ok := err.(errors.UnknownPacketTypeError); ok {
+			continue
+		}
+		if _, ok := err.(errors.UnsupportedError); ok {
+			switch p.(type) {
+			case *SymmetricallyEncrypted, *AEADEncrypted, *Compressed, *LiteralData:
+				return nil, err
+			}
+			continue
+		}
+		return nil, err
+	}
+	if errMsg = r.verifier.Next(EOSSymbol); errMsg != nil {
+		return nil, errMsg
+	}
+	if errMsg = r.verifier.AssertValid(); errMsg != nil {
+		return nil, errMsg
+	}
+	r.fullyRead = true
+	return nil, io.EOF
+}
+
+func NewCheckReader(r io.Reader) *CheckReader {
+	return &CheckReader{
+		Reader: Reader{
+			q:       nil,
+			readers: []io.Reader{r},
+		},
+		verifier:  NewSequenceVerifier(),
+		fullyRead: false,
+	}
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/recipient.go

@@ -0,0 +1,15 @@
+package packet
+
+// Recipient type represents a Intended Recipient Fingerprint subpacket
+// See https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh#name-intended-recipient-fingerpr
+type Recipient struct {
+	KeyVersion  int
+	Fingerprint []byte
+}
+
+func (r *Recipient) Serialize() []byte {
+	packet := make([]byte, len(r.Fingerprint)+1)
+	packet[0] = byte(r.KeyVersion)
+	copy(packet[1:], r.Fingerprint)
+	return packet
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetric_key_encrypted.go

@@ -0,0 +1,331 @@
+// 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"
+	"crypto/sha256"
+	"io"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"github.com/ProtonMail/go-crypto/openpgp/s2k"
+	"golang.org/x/crypto/hkdf"
+)
+
+// This is the largest session key that we'll support. Since at most 256-bit cipher
+// is supported in OpenPGP, this is large enough to contain also the auth tag.
+const maxSessionKeySizeInBytes = 64
+
+// SymmetricKeyEncrypted represents a passphrase protected session key. See RFC
+// 4880, section 5.3.
+type SymmetricKeyEncrypted struct {
+	Version      int
+	CipherFunc   CipherFunction
+	Mode         AEADMode
+	s2k          func(out, in []byte)
+	iv           []byte
+	encryptedKey []byte // Contains also the authentication tag for AEAD
+}
+
+// parse parses an SymmetricKeyEncrypted packet as specified in
+// https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#name-symmetric-key-encrypted-ses
+func (ske *SymmetricKeyEncrypted) parse(r io.Reader) error {
+	var buf [1]byte
+
+	// Version
+	if _, err := readFull(r, buf[:]); err != nil {
+		return err
+	}
+	ske.Version = int(buf[0])
+	if ske.Version != 4 && ske.Version != 5 && ske.Version != 6 {
+		return errors.UnsupportedError("unknown SymmetricKeyEncrypted version")
+	}
+
+	if V5Disabled && ske.Version == 5 {
+		return errors.UnsupportedError("support for parsing v5 entities is disabled; build with `-tags v5` if needed")
+	}
+
+	if ske.Version > 5 {
+		// Scalar octet count
+		if _, err := readFull(r, buf[:]); err != nil {
+			return err
+		}
+	}
+
+	// Cipher function
+	if _, err := readFull(r, buf[:]); err != nil {
+		return err
+	}
+	ske.CipherFunc = CipherFunction(buf[0])
+	if !ske.CipherFunc.IsSupported() {
+		return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(buf[0])))
+	}
+
+	if ske.Version >= 5 {
+		// AEAD mode
+		if _, err := readFull(r, buf[:]); err != nil {
+			return errors.StructuralError("cannot read AEAD octet from packet")
+		}
+		ske.Mode = AEADMode(buf[0])
+	}
+
+	if ske.Version > 5 {
+		// Scalar octet count
+		if _, err := readFull(r, buf[:]); err != nil {
+			return err
+		}
+	}
+
+	var err error
+	if ske.s2k, err = s2k.Parse(r); err != nil {
+		if _, ok := err.(errors.ErrDummyPrivateKey); ok {
+			return errors.UnsupportedError("missing key GNU extension in session key")
+		}
+		return err
+	}
+
+	if ske.Version >= 5 {
+		// AEAD IV
+		iv := make([]byte, ske.Mode.IvLength())
+		_, err := readFull(r, iv)
+		if err != nil {
+			return errors.StructuralError("cannot read AEAD IV")
+		}
+
+		ske.iv = iv
+	}
+
+	encryptedKey := make([]byte, maxSessionKeySizeInBytes)
+	// The session key may follow. We just have to try and read to find
+	// out. If it exists then we limit it to maxSessionKeySizeInBytes.
+	n, err := readFull(r, encryptedKey)
+	if err != nil && err != io.ErrUnexpectedEOF {
+		return err
+	}
+
+	if n != 0 {
+		if n == maxSessionKeySizeInBytes {
+			return errors.UnsupportedError("oversized encrypted session key")
+		}
+		ske.encryptedKey = encryptedKey[:n]
+	}
+	return nil
+}
+
+// Decrypt attempts to decrypt an encrypted session key and returns the key and
+// the cipher to use when decrypting a subsequent Symmetrically Encrypted Data
+// packet.
+func (ske *SymmetricKeyEncrypted) Decrypt(passphrase []byte) ([]byte, CipherFunction, error) {
+	key := make([]byte, ske.CipherFunc.KeySize())
+	ske.s2k(key, passphrase)
+	if len(ske.encryptedKey) == 0 {
+		return key, ske.CipherFunc, nil
+	}
+	switch ske.Version {
+	case 4:
+		plaintextKey, cipherFunc, err := ske.decryptV4(key)
+		return plaintextKey, cipherFunc, err
+	case 5, 6:
+		plaintextKey, err := ske.aeadDecrypt(ske.Version, key)
+		return plaintextKey, CipherFunction(0), err
+	}
+	err := errors.UnsupportedError("unknown SymmetricKeyEncrypted version")
+	return nil, CipherFunction(0), err
+}
+
+func (ske *SymmetricKeyEncrypted) decryptV4(key []byte) ([]byte, CipherFunction, error) {
+	// the IV is all zeros
+	iv := make([]byte, ske.CipherFunc.blockSize())
+	c := cipher.NewCFBDecrypter(ske.CipherFunc.new(key), iv)
+	plaintextKey := make([]byte, len(ske.encryptedKey))
+	c.XORKeyStream(plaintextKey, ske.encryptedKey)
+	cipherFunc := CipherFunction(plaintextKey[0])
+	if cipherFunc.blockSize() == 0 {
+		return nil, ske.CipherFunc, errors.UnsupportedError(
+			"unknown cipher: " + strconv.Itoa(int(cipherFunc)))
+	}
+	plaintextKey = plaintextKey[1:]
+	if len(plaintextKey) != cipherFunc.KeySize() {
+		return nil, cipherFunc, errors.StructuralError(
+			"length of decrypted key not equal to cipher keysize")
+	}
+	return plaintextKey, cipherFunc, nil
+}
+
+func (ske *SymmetricKeyEncrypted) aeadDecrypt(version int, key []byte) ([]byte, error) {
+	adata := []byte{0xc3, byte(version), byte(ske.CipherFunc), byte(ske.Mode)}
+	aead := getEncryptedKeyAeadInstance(ske.CipherFunc, ske.Mode, key, adata, version)
+
+	plaintextKey, err := aead.Open(nil, ske.iv, ske.encryptedKey, adata)
+	if err != nil {
+		return nil, err
+	}
+	return plaintextKey, nil
+}
+
+// SerializeSymmetricKeyEncrypted serializes a symmetric key packet to w.
+// The packet contains a random session key, encrypted by a key derived from
+// the given passphrase. The session key is returned and must be passed to
+// SerializeSymmetricallyEncrypted.
+// 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()
+
+	sessionKey := make([]byte, cipherFunc.KeySize())
+	_, err = io.ReadFull(config.Random(), sessionKey)
+	if err != nil {
+		return
+	}
+
+	err = SerializeSymmetricKeyEncryptedReuseKey(w, sessionKey, passphrase, config)
+	if err != nil {
+		return
+	}
+
+	key = sessionKey
+	return
+}
+
+// SerializeSymmetricKeyEncryptedReuseKey serializes a symmetric key packet to w.
+// The packet contains the given session key, encrypted by a key derived from
+// the given passphrase. The returned session key must be passed to
+// SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+// Deprecated: Use SerializeSymmetricKeyEncryptedAEADReuseKey instead.
+func SerializeSymmetricKeyEncryptedReuseKey(w io.Writer, sessionKey []byte, passphrase []byte, config *Config) (err error) {
+	return SerializeSymmetricKeyEncryptedAEADReuseKey(w, sessionKey, passphrase, config.AEAD() != nil, config)
+}
+
+// SerializeSymmetricKeyEncryptedAEADReuseKey serializes a symmetric key packet to w.
+// The packet contains the given session key, encrypted by a key derived from
+// the given passphrase. The returned session key must be passed to
+// SerializeSymmetricallyEncrypted.
+// If aeadSupported is set, SKESK v6 is used, otherwise v4.
+// Note: aeadSupported MUST match the value passed to SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricKeyEncryptedAEADReuseKey(w io.Writer, sessionKey []byte, passphrase []byte, aeadSupported bool, config *Config) (err error) {
+	var version int
+	if aeadSupported {
+		version = 6
+	} else {
+		version = 4
+	}
+	cipherFunc := config.Cipher()
+	// cipherFunc must be AES
+	if !cipherFunc.IsSupported() || cipherFunc < CipherAES128 || cipherFunc > CipherAES256 {
+		return errors.UnsupportedError("unsupported cipher: " + strconv.Itoa(int(cipherFunc)))
+	}
+
+	keySize := cipherFunc.KeySize()
+	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, config.S2K())
+	if err != nil {
+		return
+	}
+	s2kBytes := s2kBuf.Bytes()
+
+	var packetLength int
+	switch version {
+	case 4:
+		packetLength = 2 /* header */ + len(s2kBytes) + 1 /* cipher type */ + keySize
+	case 5, 6:
+		ivLen := config.AEAD().Mode().IvLength()
+		tagLen := config.AEAD().Mode().TagLength()
+		packetLength = 3 + len(s2kBytes) + ivLen + keySize + tagLen
+	}
+	if version > 5 {
+		packetLength += 2 // additional octet count fields
+	}
+
+	err = serializeHeader(w, packetTypeSymmetricKeyEncrypted, packetLength)
+	if err != nil {
+		return
+	}
+
+	// Symmetric Key Encrypted Version
+	buf := []byte{byte(version)}
+
+	if version > 5 {
+		// Scalar octet count
+		buf = append(buf, byte(3+len(s2kBytes)+config.AEAD().Mode().IvLength()))
+	}
+
+	// Cipher function
+	buf = append(buf, byte(cipherFunc))
+
+	if version >= 5 {
+		// AEAD mode
+		buf = append(buf, byte(config.AEAD().Mode()))
+	}
+	if version > 5 {
+		// Scalar octet count
+		buf = append(buf, byte(len(s2kBytes)))
+	}
+	_, err = w.Write(buf)
+	if err != nil {
+		return
+	}
+	_, err = w.Write(s2kBytes)
+	if err != nil {
+		return
+	}
+
+	switch version {
+	case 4:
+		iv := make([]byte, cipherFunc.blockSize())
+		c := cipher.NewCFBEncrypter(cipherFunc.new(keyEncryptingKey), iv)
+		encryptedCipherAndKey := make([]byte, keySize+1)
+		c.XORKeyStream(encryptedCipherAndKey, buf[1:])
+		c.XORKeyStream(encryptedCipherAndKey[1:], sessionKey)
+		_, err = w.Write(encryptedCipherAndKey)
+		if err != nil {
+			return
+		}
+	case 5, 6:
+		mode := config.AEAD().Mode()
+		adata := []byte{0xc3, byte(version), byte(cipherFunc), byte(mode)}
+		aead := getEncryptedKeyAeadInstance(cipherFunc, mode, keyEncryptingKey, adata, version)
+
+		// Sample iv using random reader
+		iv := make([]byte, config.AEAD().Mode().IvLength())
+		_, err = io.ReadFull(config.Random(), iv)
+		if err != nil {
+			return
+		}
+		// Seal and write (encryptedData includes auth. tag)
+
+		encryptedData := aead.Seal(nil, iv, sessionKey, adata)
+		_, err = w.Write(iv)
+		if err != nil {
+			return
+		}
+		_, err = w.Write(encryptedData)
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+func getEncryptedKeyAeadInstance(c CipherFunction, mode AEADMode, inputKey, associatedData []byte, version int) (aead cipher.AEAD) {
+	var blockCipher cipher.Block
+	if version > 5 {
+		hkdfReader := hkdf.New(sha256.New, inputKey, []byte{}, associatedData)
+
+		encryptionKey := make([]byte, c.KeySize())
+		_, _ = readFull(hkdfReader, encryptionKey)
+
+		blockCipher = c.new(encryptionKey)
+	} else {
+		blockCipher = c.new(inputKey)
+	}
+	return mode.new(blockCipher)
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetrically_encrypted.go

@@ -0,0 +1,94 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"io"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+const aeadSaltSize = 32
+
+// 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 {
+	Version            int
+	Contents           io.Reader // contains tag for version 2
+	IntegrityProtected bool      // If true it is type 18 (with MDC or AEAD). False is packet type 9
+
+	// Specific to version 1
+	prefix []byte
+
+	// Specific to version 2
+	Cipher        CipherFunction
+	Mode          AEADMode
+	ChunkSizeByte byte
+	Salt          [aeadSaltSize]byte
+}
+
+const (
+	symmetricallyEncryptedVersionMdc  = 1
+	symmetricallyEncryptedVersionAead = 2
+)
+
+func (se *SymmetricallyEncrypted) parse(r io.Reader) error {
+	if se.IntegrityProtected {
+		// See RFC 4880, section 5.13.
+		var buf [1]byte
+		_, err := readFull(r, buf[:])
+		if err != nil {
+			return err
+		}
+
+		switch buf[0] {
+		case symmetricallyEncryptedVersionMdc:
+			se.Version = symmetricallyEncryptedVersionMdc
+		case symmetricallyEncryptedVersionAead:
+			se.Version = symmetricallyEncryptedVersionAead
+			if err := se.parseAead(r); err != nil {
+				return err
+			}
+		default:
+			return errors.UnsupportedError("unknown SymmetricallyEncrypted version")
+		}
+	}
+	se.Contents = r
+	return nil
+}
+
+// Decrypt returns a ReadCloser, from which the decrypted Contents of the
+// packet can be read. An incorrect key will only be detected after trying
+// to decrypt the entire data.
+func (se *SymmetricallyEncrypted) Decrypt(c CipherFunction, key []byte) (io.ReadCloser, error) {
+	if se.Version == symmetricallyEncryptedVersionAead {
+		return se.decryptAead(key)
+	}
+
+	return se.decryptMdc(c, key)
+}
+
+// SerializeSymmetricallyEncrypted serializes a symmetrically encrypted packet
+// to w and returns a WriteCloser to which the to-be-encrypted packets can be
+// written.
+// If aeadSupported is set to true, SEIPDv2 is used with the indicated CipherSuite.
+// Otherwise, SEIPDv1 is used with the indicated CipherFunction.
+// Note: aeadSupported MUST match the value passed to SerializeEncryptedKeyAEAD
+// and/or SerializeSymmetricKeyEncryptedAEADReuseKey.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricallyEncrypted(w io.Writer, c CipherFunction, aeadSupported bool, cipherSuite CipherSuite, key []byte, config *Config) (Contents io.WriteCloser, err error) {
+	writeCloser := noOpCloser{w}
+	ciphertext, err := serializeStreamHeader(writeCloser, packetTypeSymmetricallyEncryptedIntegrityProtected)
+	if err != nil {
+		return
+	}
+
+	if aeadSupported {
+		return serializeSymmetricallyEncryptedAead(ciphertext, cipherSuite, config.AEADConfig.ChunkSizeByte(), config.Random(), key)
+	}
+
+	return serializeSymmetricallyEncryptedMdc(ciphertext, c, key, config)
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetrically_encrypted_aead.go

@@ -0,0 +1,168 @@
+// Copyright 2023 Proton AG. 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/sha256"
+	"fmt"
+	"io"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+	"golang.org/x/crypto/hkdf"
+)
+
+// parseAead parses a V2 SEIPD packet (AEAD) as specified in
+// https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#section-5.13.2
+func (se *SymmetricallyEncrypted) parseAead(r io.Reader) error {
+	headerData := make([]byte, 3)
+	if n, err := io.ReadFull(r, headerData); n < 3 {
+		return errors.StructuralError("could not read aead header: " + err.Error())
+	}
+
+	// Cipher
+	se.Cipher = CipherFunction(headerData[0])
+	// cipherFunc must have block size 16 to use AEAD
+	if se.Cipher.blockSize() != 16 {
+		return errors.UnsupportedError("invalid aead cipher: " + strconv.Itoa(int(se.Cipher)))
+	}
+
+	// Mode
+	se.Mode = AEADMode(headerData[1])
+	if se.Mode.TagLength() == 0 {
+		return errors.UnsupportedError("unknown aead mode: " + strconv.Itoa(int(se.Mode)))
+	}
+
+	// Chunk size
+	se.ChunkSizeByte = headerData[2]
+	if se.ChunkSizeByte > 16 {
+		return errors.UnsupportedError("invalid aead chunk size byte: " + strconv.Itoa(int(se.ChunkSizeByte)))
+	}
+
+	// Salt
+	if n, err := io.ReadFull(r, se.Salt[:]); n < aeadSaltSize {
+		return errors.StructuralError("could not read aead salt: " + err.Error())
+	}
+
+	return nil
+}
+
+// associatedData for chunks: tag, version, cipher, mode, chunk size byte
+func (se *SymmetricallyEncrypted) associatedData() []byte {
+	return []byte{
+		0xD2,
+		symmetricallyEncryptedVersionAead,
+		byte(se.Cipher),
+		byte(se.Mode),
+		se.ChunkSizeByte,
+	}
+}
+
+// decryptAead decrypts a V2 SEIPD packet (AEAD) as specified in
+// https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#section-5.13.2
+func (se *SymmetricallyEncrypted) decryptAead(inputKey []byte) (io.ReadCloser, error) {
+	if se.Cipher.KeySize() != len(inputKey) {
+		return nil, errors.StructuralError(fmt.Sprintf("invalid session key length for cipher: got %d bytes, but expected %d bytes", len(inputKey), se.Cipher.KeySize()))
+	}
+
+	aead, nonce := getSymmetricallyEncryptedAeadInstance(se.Cipher, se.Mode, inputKey, se.Salt[:], se.associatedData())
+	// Carry the first tagLen bytes
+	chunkSize := decodeAEADChunkSize(se.ChunkSizeByte)
+	tagLen := se.Mode.TagLength()
+	chunkBytes := make([]byte, chunkSize+tagLen*2)
+	peekedBytes := chunkBytes[chunkSize+tagLen:]
+	n, err := io.ReadFull(se.Contents, peekedBytes)
+	if n < tagLen || (err != nil && err != io.EOF) {
+		return nil, errors.StructuralError("not enough data to decrypt:" + err.Error())
+	}
+
+	return &aeadDecrypter{
+		aeadCrypter: aeadCrypter{
+			aead:           aead,
+			chunkSize:      decodeAEADChunkSize(se.ChunkSizeByte),
+			nonce:          nonce,
+			associatedData: se.associatedData(),
+			chunkIndex:     nonce[len(nonce)-8:],
+			packetTag:      packetTypeSymmetricallyEncryptedIntegrityProtected,
+		},
+		reader:      se.Contents,
+		chunkBytes:  chunkBytes,
+		peekedBytes: peekedBytes,
+	}, nil
+}
+
+// serializeSymmetricallyEncryptedAead encrypts to a writer a V2 SEIPD packet (AEAD) as specified in
+// https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-07.html#section-5.13.2
+func serializeSymmetricallyEncryptedAead(ciphertext io.WriteCloser, cipherSuite CipherSuite, chunkSizeByte byte, rand io.Reader, inputKey []byte) (Contents io.WriteCloser, err error) {
+	// cipherFunc must have block size 16 to use AEAD
+	if cipherSuite.Cipher.blockSize() != 16 {
+		return nil, errors.InvalidArgumentError("invalid aead cipher function")
+	}
+
+	if cipherSuite.Cipher.KeySize() != len(inputKey) {
+		return nil, errors.InvalidArgumentError("error in aead serialization: bad key length")
+	}
+
+	// Data for en/decryption: tag, version, cipher, aead mode, chunk size
+	prefix := []byte{
+		0xD2,
+		symmetricallyEncryptedVersionAead,
+		byte(cipherSuite.Cipher),
+		byte(cipherSuite.Mode),
+		chunkSizeByte,
+	}
+
+	// Write header (that correspond to prefix except first byte)
+	n, err := ciphertext.Write(prefix[1:])
+	if err != nil || n < 4 {
+		return nil, err
+	}
+
+	// Random salt
+	salt := make([]byte, aeadSaltSize)
+	if _, err := io.ReadFull(rand, salt); err != nil {
+		return nil, err
+	}
+
+	if _, err := ciphertext.Write(salt); err != nil {
+		return nil, err
+	}
+
+	aead, nonce := getSymmetricallyEncryptedAeadInstance(cipherSuite.Cipher, cipherSuite.Mode, inputKey, salt, prefix)
+
+	chunkSize := decodeAEADChunkSize(chunkSizeByte)
+	tagLen := aead.Overhead()
+	chunkBytes := make([]byte, chunkSize+tagLen)
+	return &aeadEncrypter{
+		aeadCrypter: aeadCrypter{
+			aead:           aead,
+			chunkSize:      chunkSize,
+			associatedData: prefix,
+			nonce:          nonce,
+			chunkIndex:     nonce[len(nonce)-8:],
+			packetTag:      packetTypeSymmetricallyEncryptedIntegrityProtected,
+		},
+		writer:     ciphertext,
+		chunkBytes: chunkBytes,
+	}, nil
+}
+
+func getSymmetricallyEncryptedAeadInstance(c CipherFunction, mode AEADMode, inputKey, salt, associatedData []byte) (aead cipher.AEAD, nonce []byte) {
+	hkdfReader := hkdf.New(sha256.New, inputKey, salt, associatedData)
+
+	encryptionKey := make([]byte, c.KeySize())
+	_, _ = readFull(hkdfReader, encryptionKey)
+
+	nonce = make([]byte, mode.IvLength())
+
+	// Last 64 bits of nonce are the counter
+	_, _ = readFull(hkdfReader, nonce[:len(nonce)-8])
+
+	blockCipher := c.new(encryptionKey)
+	aead = mode.new(blockCipher)
+
+	return
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/symmetrically_encrypted_mdc.go

@@ -0,0 +1,256 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto/cipher"
+	"crypto/sha1"
+	"crypto/subtle"
+	"hash"
+	"io"
+	"strconv"
+
+	"github.com/ProtonMail/go-crypto/openpgp/errors"
+)
+
+// seMdcReader wraps an io.Reader with a no-op Close method.
+type seMdcReader struct {
+	in io.Reader
+}
+
+func (ser seMdcReader) Read(buf []byte) (int, error) {
+	return ser.in.Read(buf)
+}
+
+func (ser seMdcReader) Close() error {
+	return nil
+}
+
+func (se *SymmetricallyEncrypted) decryptMdc(c CipherFunction, key []byte) (io.ReadCloser, error) {
+	if !c.IsSupported() {
+		return nil, errors.UnsupportedError("unsupported cipher: " + strconv.Itoa(int(c)))
+	}
+
+	if len(key) != c.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.IntegrityProtected {
+		// MDC packets use a different form of OCFB mode.
+		ocfbResync = OCFBNoResync
+	}
+
+	s := NewOCFBDecrypter(c.new(key), se.prefix, ocfbResync)
+
+	plaintext := cipher.StreamReader{S: s, R: se.Contents}
+
+	if se.IntegrityProtected {
+		// IntegrityProtected 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 seMdcReader{plaintext}, 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 (Integrity Protected) packet.
+const mdcPacketTagByte = byte(0x80) | 0x40 | 19
+
+func (ser *seMDCReader) Close() error {
+	if ser.error {
+		return errors.ErrMDCHashMismatch
+	}
+
+	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.ErrMDCHashMismatch
+		}
+	}
+
+	ser.h.Write(ser.trailer[:2])
+
+	final := ser.h.Sum(nil)
+	if subtle.ConstantTimeCompare(final, ser.trailer[2:]) != 1 {
+		return errors.ErrMDCHashMismatch
+	}
+	// The hash already includes the MDC header, but we still check its value
+	// to confirm encryption correctness
+	if ser.trailer[0] != mdcPacketTagByte || ser.trailer[1] != sha1.Size {
+		return errors.ErrMDCHashMismatch
+	}
+	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
+}
+
+func serializeSymmetricallyEncryptedMdc(ciphertext io.WriteCloser, c CipherFunction, key []byte, config *Config) (Contents io.WriteCloser, err error) {
+	// Disallow old cipher suites
+	if !c.IsSupported() || c < CipherAES128 {
+		return nil, errors.InvalidArgumentError("invalid mdc cipher function")
+	}
+
+	if c.KeySize() != len(key) {
+		return nil, errors.InvalidArgumentError("error in mdc serialization: bad key length")
+	}
+
+	_, err = ciphertext.Write([]byte{symmetricallyEncryptedVersionMdc})
+	if err != nil {
+		return
+	}
+
+	block := c.new(key)
+	blockSize := block.BlockSize()
+	iv := make([]byte, blockSize)
+	_, err = io.ReadFull(config.Random(), iv)
+	if err != nil {
+		return nil, err
+	}
+	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
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/userattribute.go

@@ -0,0 +1,100 @@
+// 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"
+)
+
+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
+		}
+
+		lengthBuf := make([]byte, 5)
+		n := serializeSubpacketLength(lengthBuf, len(buf.Bytes())+1)
+		lengthBuf = lengthBuf[:n]
+
+		uat.Contents = append(uat.Contents, &OpaqueSubpacket{
+			SubType:       UserAttrImageSubpacket,
+			EncodedLength: lengthBuf,
+			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 := io.ReadAll(r)
+	if err != nil {
+		return
+	}
+	uat.Contents, err = OpaqueSubpackets(b)
+	return
+}
+
+// Serialize marshals the user attribute to w in the form of an OpenPGP packet, including
+// header.
+func (uat *UserAttribute) Serialize(w io.Writer) (err error) {
+	var buf bytes.Buffer
+	for _, sp := range uat.Contents {
+		err = sp.Serialize(&buf)
+		if err != nil {
+			return err
+		}
+	}
+	if err = serializeHeader(w, packetTypeUserAttribute, buf.Len()); err != nil {
+		return err
+	}
+	_, err = w.Write(buf.Bytes())
+	return
+}
+
+// ImageData returns zero or more byte slices, each containing
+// JPEG File Interchange Format (JFIF), for each photo in the
+// user attribute packet.
+func (uat *UserAttribute) ImageData() (imageData [][]byte) {
+	for _, sp := range uat.Contents {
+		if sp.SubType == UserAttrImageSubpacket && len(sp.Contents) > 16 {
+			imageData = append(imageData, sp.Contents[16:])
+		}
+	}
+	return
+}

vendor/github.com/ProtonMail/go-crypto/openpgp/packet/userid.go

@@ -0,0 +1,166 @@
+// 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"
+	"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 := io.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])
+
+	// RFC 2822 3.4: alternate simple form of a mailbox
+	if email == "" && strings.ContainsRune(name, '@') {
+		email = name
+		name = ""
+	}
+
+	return
+}