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Decrypt verify message armored #246

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Decrypt verify message armored #246

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594b3ea
Add DecryptVerifyMessageArmored
snowstorm399 Jun 21, 2023
dd6a353
Update helper.go
snowstorm399 Jun 21, 2023
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33 changes: 25 additions & 8 deletions helper/helper.go
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Original file line number Diff line number Diff line change
Expand Up @@ -103,38 +103,55 @@ func DecryptMessageArmored(
// plain data or an error on signature verification failure.
func DecryptVerifyMessageArmored(
publicKey, privateKey string, passphrase []byte, ciphertext string,
) (plaintext string, err error) {
) (plainMessage string, err error) {
message, err := decryptVerifyDataArmored(publicKey, privateKey, passphrase, ciphertext)
return message.GetString(), err
}

// DecryptVerifyBinaryMessageArmored decrypts an armored PGP binary given a private
// key and its passphrase and verifies the embedded signature. Returns the
// binary data or an error on signature verification failure.
func DecryptVerifyBinaryMessageArmored(
publicKey, privateKey string, passphrase []byte, data []byte,
) (plainData []byte, err error) {
message, err := decryptVerifyDataArmored(publicKey, privateKey, passphrase, string(data))
return message.GetBinary(), err
}

func decryptVerifyDataArmored(
publicKey, privateKey string, passphrase []byte, ciphertext string,
) (massage *crypto.PlainMessage, err error) {
var privateKeyObj, unlockedKeyObj *crypto.Key
var publicKeyRing, privateKeyRing *crypto.KeyRing
var pgpMessage *crypto.PGPMessage
var message *crypto.PlainMessage

if publicKeyRing, err = createPublicKeyRing(publicKey); err != nil {
return "", err
return message, err
}

if privateKeyObj, err = crypto.NewKeyFromArmored(privateKey); err != nil {
return "", errors.Wrap(err, "gopenpgp: unable to unarmor private key")
return message, errors.Wrap(err, "gopenpgp: unable to unarmor private key")
}

if unlockedKeyObj, err = privateKeyObj.Unlock(passphrase); err != nil {
return "", errors.Wrap(err, "gopenpgp: unable to unlock private key")
return message, errors.Wrap(err, "gopenpgp: unable to unlock private key")
}
defer unlockedKeyObj.ClearPrivateParams()

if privateKeyRing, err = crypto.NewKeyRing(unlockedKeyObj); err != nil {
return "", errors.Wrap(err, "gopenpgp: unable to create new keyring")
return message, errors.Wrap(err, "gopenpgp: unable to create new keyring")
}

if pgpMessage, err = crypto.NewPGPMessageFromArmored(ciphertext); err != nil {
return "", errors.Wrap(err, "gopenpgp: unable to unarmor ciphertext")
return message, errors.Wrap(err, "gopenpgp: unable to unarmor ciphertext")
}

if message, err = privateKeyRing.Decrypt(pgpMessage, publicKeyRing, crypto.GetUnixTime()); err != nil {
return "", errors.Wrap(err, "gopenpgp: unable to decrypt message")
return message, errors.Wrap(err, "gopenpgp: unable to decrypt message")
}

return message.GetString(), nil
return message, nil
}

// DecryptVerifyAttachment decrypts and verifies an attachment split into the
Expand Down