"""Crypto tests.
"""

from __future__ import division, print_function

from binascii import unhexlify

import pytest

import rarfile

try:
    from cryptography.hazmat.backends import default_backend
    from cryptography.hazmat.primitives.ciphers import (
        Cipher, algorithms, modes,
    )
    def aes_encrypt(key, iv, data):
        ciph = Cipher(algorithms.AES(key), modes.CBC(iv), default_backend())
        enc = ciph.encryptor()
        return enc.update(data)
except ImportError:
    pass


@pytest.mark.skipif(not rarfile._have_crypto, reason="No crypto")
def test_aes128_cbc():
    data = b"0123456789abcdef" * 2
    key = b"\x02" * 16
    iv = b"\x80" * 16

    #encdata = aes_encrypt(key, iv, data)
    encdata = unhexlify("4b0d438b4a1b972bd4ab81cd64674dcce4b0158090fbe616f455354284d53502")

    ctx = rarfile.AES_CBC_Decrypt(key, iv)
    assert ctx.decrypt(encdata) == data


@pytest.mark.skipif(not rarfile._have_crypto, reason="No crypto")
def test_aes256_cbc():
    data = b"0123456789abcdef" * 2
    key = b"\x52" * 32
    iv = b"\x70" * 16

    #encdata = aes_encrypt(key, iv, data)
    encdata = unhexlify("24988f387592e4d95b6eaab013137a221f81b25aa7ecde0ef4f4d7a95f92c250")

    ctx = rarfile.AES_CBC_Decrypt(key, iv)
    assert ctx.decrypt(encdata) == data