func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
if signer.PrivateKey == nil {
return errors.InvalidArgumentError("signing key doesn't have a private key")
}
if signer.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing key is encrypted")
}
sig := new(packet.Signature)
sig.SigType = sigType
sig.PubKeyAlgo = signer.PrivateKey.PubKeyAlgo
sig.Hash = config.Hash()
sig.CreationTime = config.Now()
sig.IssuerKeyId = &signer.PrivateKey.KeyId
h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
if err != nil {
return
}
io.Copy(wrappedHash, message)
err = sig.Sign(h, signer.PrivateKey, config)
if err != nil {
return
}
return sig.Serialize(w)
}
func (d *dashEscaper) Close() (err error) {
if !d.atBeginningOfLine {
if err = d.buffered.WriteByte(lf); err != nil {
return
}
}
sig := new(packet.Signature)
sig.SigType = packet.SigTypeText
sig.PubKeyAlgo = d.privateKey.PubKeyAlgo
sig.Hash = d.hashType
sig.CreationTime = d.config.Now()
sig.IssuerKeyId = &d.privateKey.KeyId
if err = sig.Sign(d.h, d.privateKey, d.config); err != nil {
return
}
out, err := armor.Encode(d.buffered, "PGP SIGNATURE", nil)
if err != nil {
return
}
if err = sig.Serialize(out); err != nil {
return
}
if err = out.Close(); err != nil {
return
}
if err = d.buffered.Flush(); err != nil {
return
}
return
}