Function _encrypt

pgpy/symenc.py:18–35

(pt, key, alg, iv=None)

def _encrypt(pt, key, alg, iv=None):
    if iv is None:
        iv = b'\x00' * (alg.block_size // 8)

    if alg.is_insecure:
        raise PGPInsecureCipherError("{:s} is not secure. Do not use it for encryption!".format(alg.name))

    if not alg.is_supported:
        raise PGPEncryptionError("Cipher {:s} not supported".format(alg.name))

    try:
        encryptor = Cipher(alg.cipher(key), modes.CFB(iv), default_backend()).encryptor()

    except UnsupportedAlgorithm as ex:  # pragma: no cover
        raise PGPEncryptionError from ex

    else:
        return bytearray(encryptor.update(pt) + encryptor.finalize())


def _decrypt(ct, key, alg, iv=None):