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Add methods for embedded signatures using session keys (#128)

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* Add methods to sign when using session keys

* Add mobile helpers for explicit decryption

* Add functions to CHANGELOG

* Fix linter
This commit is contained in:
wussler 2021-04-27 17:38:25 +02:00 • committed by GitHub
parent 3dd1711707
commit c19faed5da
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 261 additions and 27 deletions
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25
helper/mobile.go
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@ -14,18 +14,33 @@ type ExplicitVerifyMessage struct {
SignatureVerificationError *crypto.SignatureVerificationError
}
// DecryptExplicitVerify decrypts an armored PGP message given a private key
// and its passphrase and verifies the embedded signature. Returns the plain
// data or an error on signature verification failure.
// DecryptExplicitVerify decrypts a PGP message given a private keyring
// and a public keyring to verify the embedded signature. Returns the plain
// data and an error on signature verification failure.
func DecryptExplicitVerify(
pgpMessage *crypto.PGPMessage,
privateKeyRing, publicKeyRing *crypto.KeyRing,
verifyTime int64,
) (*ExplicitVerifyMessage, error) {
var explicitVerify *ExplicitVerifyMessage
message, err := privateKeyRing.Decrypt(pgpMessage, publicKeyRing, verifyTime)
return newExplicitVerifyMessage(message, err)
}
// DecryptSessionKeyExplicitVerify decrypts a PGP data packet given a session key
// and a public keyring to verify the embedded signature. Returns the plain data and
// an error on signature verification failure.
func DecryptSessionKeyExplicitVerify(
dataPacket []byte,
sessionKey *crypto.SessionKey,
publicKeyRing *crypto.KeyRing,
verifyTime int64,
) (*ExplicitVerifyMessage, error) {
message, err := sessionKey.DecryptAndVerify(dataPacket, publicKeyRing, verifyTime)
return newExplicitVerifyMessage(message, err)
}
func newExplicitVerifyMessage(message *crypto.PlainMessage, err error) (*ExplicitVerifyMessage, error) {
var explicitVerify *ExplicitVerifyMessage
if err != nil {
castedErr := &crypto.SignatureVerificationError{}
isType := goerrors.As(err, castedErr)