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