func SaltpackVerify(g *GlobalContext, source io.Reader, sink io.WriteCloser, checkSender func(saltpack.SigningPublicKey) error) error {
sc, newSource, err := ClassifyStream(source)
if err != nil {
return err
}
if sc.Format != CryptoMessageFormatSaltpack {
return WrongCryptoFormatError{
Wanted: CryptoMessageFormatSaltpack,
Received: sc.Format,
Operation: "verify",
}
}
source = newSource
kr := echoKeyring{Contextified: NewContextified(g)}
var skey saltpack.SigningPublicKey
var vs io.Reader
var frame saltpack.Frame
if sc.Armored {
skey, vs, frame, err = saltpack.NewDearmor62VerifyStream(source, kr)
} else {
skey, vs, err = saltpack.NewVerifyStream(source, kr)
}
if err != nil {
g.Log.Debug("saltpack.NewDearmor62VerifyStream error: %s", err)
return err
}
if checkSender != nil {
if err = checkSender(skey); err != nil {
return err
}
}
n, err := io.Copy(sink, vs)
if err != nil {
return err
}
if sc.Armored {
if brand, err := saltpack.CheckArmor62Frame(frame, saltpack.MessageTypeAttachedSignature); err != nil {
return err
} else if err = checkSaltpackBrand(brand); err != nil {
return err
}
}
g.Log.Debug("Verify: read %d bytes", n)
if err := sink.Close(); err != nil {
return err
}
return nil
}
func SaltpackDecrypt(
g *GlobalContext, source io.Reader, sink io.WriteCloser,
deviceEncryptionKey NaclDHKeyPair,
checkSender func(*saltpack.MessageKeyInfo) error) (*saltpack.MessageKeyInfo, error) {
sc, newSource, err := ClassifyStream(source)
if err != nil {
return nil, err
}
if sc.Format != CryptoMessageFormatSaltpack {
return nil, WrongCryptoFormatError{
Wanted: CryptoMessageFormatSaltpack,
Received: sc.Format,
Operation: "decrypt",
}
}
source = newSource
var mki *saltpack.MessageKeyInfo
var plainsource io.Reader
var frame saltpack.Frame
if sc.Armored {
mki, plainsource, frame, err = saltpack.NewDearmor62DecryptStream(source, naclKeyring(deviceEncryptionKey))
} else {
mki, plainsource, err = saltpack.NewDecryptStream(source, naclKeyring(deviceEncryptionKey))
}
if err != nil {
return mki, err
}
if checkSender != nil {
if err = checkSender(mki); err != nil {
return mki, err
}
}
n, err := io.Copy(sink, plainsource)
if err != nil {
return mki, err
}
// TODO: Check header inline, and only warn if the footer
// doesn't match.
if sc.Armored {
var brand string
brand, err = saltpack.CheckArmor62Frame(frame, saltpack.MessageTypeEncryption)
if err != nil {
return mki, err
}
if err = checkSaltpackBrand(brand); err != nil {
return mki, err
}
}
g.Log.Debug("Decrypt: read %d bytes", n)
if err := sink.Close(); err != nil {
return mki, err
}
return mki, nil
}