Method decrypt

pgpy/pgp.py:2567–2596

Decrypt a PGPMessage using this key. :param message: An encrypted :py:obj:`PGPMessage` :raises: :py:exc:`~errors.PGPError` if the key is not private, or protected but not unlocked. :raises: :py:exc:`~errors.PGPDecryptionError` if decryption fails for any other reaso

(self, message)

    @KeyAction(is_unlocked=True, is_public=False)
    def decrypt(self, message):
        """
        Decrypt a PGPMessage using this key.

        :param message: An encrypted :py:obj:`PGPMessage`
        :raises: :py:exc:`~errors.PGPError` if the key is not private, or protected but not unlocked.
        :raises: :py:exc:`~errors.PGPDecryptionError` if decryption fails for any other reason.
        :returns: A new :py:obj:`PGPMessage` with the decrypted contents of ``message``.
        """
        if not message.is_encrypted:
            warnings.warn("This message is not encrypted", stacklevel=3)
            return message

        if self.fingerprint.keyid not in message.encrypters:
            sks = set(self.subkeys)
            mis = set(message.encrypters)
            if sks & mis:
                skid = list(sks & mis)[0]
                return self.subkeys[skid].decrypt(message)

            raise PGPError("Cannot decrypt the provided message with this key")

        pkesk = next(pk for pk in message._sessionkeys if pk.pkalg == self.key_algorithm and pk.encrypter == self.fingerprint.keyid)
        alg, key = pkesk.decrypt_sk(self._key)

        # now that we have the symmetric cipher used and the key, we can decrypt the actual message
        decmsg = PGPMessage()
        decmsg.parse(message.message.decrypt(key, alg))

        return decmsg

    def parse(self, data):
        unarmored = self.ascii_unarmor(data)