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/*
Hockeypuck - OpenPGP key server
Copyright (C) 2012-2014 Casey Marshall
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, version 3.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package openpgp
import (
"bytes"
"crypto/sha256"
"database/sql"
"encoding/ascii85"
"encoding/binary"
"encoding/hex"
"errors"
"io"
"time"
"code.google.com/p/go.crypto/openpgp/packet"
"launchpad.net/hockeypuck/util"
)
type Signature struct {
ScopedDigest string `db:"uuid"` // immutable
Creation time.Time `db:"creation"` // immutable
Expiration time.Time `db:"expiration"` // immutable
State int `db:"state"` // mutable
Packet []byte `db:"packet"` // immutable
SigType int `db:"sig_type"` // immutable
RIssuerKeyId string `db:"signer"` // immutable
RIssuerFingerprint sql.NullString `db:"signer_uuid"` // mutable
RevSigDigest sql.NullString `db:"revsig_uuid"` // mutable
/* Cross-references */
revSig *Signature `db:"-"`
/* Parsed packet data */
Signature *packet.Signature
SignatureV3 *packet.SignatureV3
}
func (sig *Signature) IssuerKeyId() string {
return util.Reverse(sig.RIssuerKeyId)
}
func (sig *Signature) IssuerShortId() string {
return sig.IssuerKeyId()[8:16]
}
func (sig *Signature) IssuerFingerprint() string {
return util.Reverse(sig.RIssuerFingerprint.String)
}
func toAscii85String(buf []byte) string {
out := bytes.NewBuffer(nil)
enc := ascii85.NewEncoder(out)
enc.Write(buf)
enc.Close()
return out.String()
}
func (sig *Signature) calcScopedDigest(pubkey *Pubkey, scope string) string {
h := sha256.New()
h.Write([]byte(pubkey.RFingerprint))
h.Write([]byte("{sig}"))
h.Write([]byte(scope))
h.Write([]byte("{sig}"))
h.Write(sig.Packet)
return toAscii85String(h.Sum(nil))
}
func (sig *Signature) Serialize(w io.Writer) error {
_, err := w.Write(sig.Packet)
return err
}
func (sig *Signature) Uuid() string { return sig.ScopedDigest }
func (sig *Signature) GetOpaquePacket() (*packet.OpaquePacket, error) {
return toOpaquePacket(sig.Packet)
}
func (sig *Signature) GetPacket() (p packet.Packet, err error) {
if sig.Signature != nil {
p = sig.Signature
} else if sig.SignatureV3 != nil {
p = sig.SignatureV3
} else {
err = ErrPacketRecordState
}
return
}
func (sig *Signature) setPacket(p packet.Packet) (err error) {
switch s := p.(type) {
case *packet.Signature:
sig.Signature = s
case *packet.SignatureV3:
sig.SignatureV3 = s
default:
err = ErrInvalidPacketType
}
return
}
func (sig *Signature) Read() (err error) {
buf := bytes.NewBuffer(sig.Packet)
var p packet.Packet
if p, err = packet.Read(buf); err != nil {
return
}
return sig.setPacket(p)
}
func (sig *Signature) GetSignature() (packet.Packet, error) {
buf := bytes.NewBuffer(sig.Packet)
return packet.Read(buf)
}
func NewSignature(op *packet.OpaquePacket) (sig *Signature, err error) {
var buf bytes.Buffer
if err = op.Serialize(&buf); err != nil {
return
}
sig = &Signature{Packet: buf.Bytes()}
var p packet.Packet
if p, err = op.Parse(); err != nil {
return
}
if err = sig.setPacket(p); err != nil {
return
}
if sig.Signature != nil {
err = sig.initV4()
} else if sig.SignatureV3 != nil {
err = sig.initV3()
} else {
err = ErrInvalidPacketType
}
return
}
func (sig *Signature) initV3() (err error) {
sig.Creation = sig.SignatureV3.CreationTime
// V3 packets do not have an expiration time
sig.Expiration = NeverExpires
sig.SigType = int(sig.SignatureV3.SigType)
// Extract the issuer key id
var issuerKeyId [8]byte
binary.BigEndian.PutUint64(issuerKeyId[:], sig.SignatureV3.IssuerKeyId)
sigKeyId := hex.EncodeToString(issuerKeyId[:])
sig.RIssuerKeyId = util.Reverse(sigKeyId)
return
}
func (sig *Signature) initV4() (err error) {
if sig.Signature.IssuerKeyId == nil {
return errors.New("Signature missing issuer key ID")
}
sig.Creation = sig.Signature.CreationTime
sig.Expiration = NeverExpires
sig.SigType = int(sig.Signature.SigType)
// Extract the issuer key id
var issuerKeyId [8]byte
if sig.Signature.IssuerKeyId != nil {
binary.BigEndian.PutUint64(issuerKeyId[:], *sig.Signature.IssuerKeyId)
sigKeyId := hex.EncodeToString(issuerKeyId[:])
sig.RIssuerKeyId = util.Reverse(sigKeyId)
}
// Expiration time
if sig.Signature.SigLifetimeSecs != nil {
sig.Expiration = sig.Signature.CreationTime.Add(
time.Duration(*sig.Signature.SigLifetimeSecs) * time.Second)
}
return
}
func (sig *Signature) Visit(visitor PacketVisitor) (err error) {
return visitor(sig)
}
func (sig *Signature) IsPrimary() bool {
return sig.Signature != nil && sig.Signature.IsPrimaryId != nil && *sig.Signature.IsPrimaryId
}
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