def test_cbc256_decrypt(self):
key = bytes.fromhex("""
603DEB10 15CA71BE 2B73AEF0 857D7781
1F352C07 3B6108D7 2D9810A3 0914DFF4
""".replace(" ", "").replace("\n", ""))
iv = bytes.fromhex("""
00010203 04050607 08090A0B 0C0D0E0F
""".replace(" ", "").replace("\n", ""))
ciphertext = bytes.fromhex("""
F58C4C04 D6E5F1BA 779EABFB 5F7BFBD6
9CFC4E96 7EDB808D 679F777B C6702C7D
39F23369 A9D9BACF A530E263 04231461
B2EB05E2 C39BE9FC DA6C1907 8C6A9D1B
""".replace(" ", "").replace("\n", ""))
plaintext = bytes.fromhex("""
6BC1BEE2 2E409F96 E93D7E11 7393172A
AE2D8A57 1E03AC9C 9EB76FAC 45AF8E51
30C81C46 A35CE411 E5FBC119 1A0A52EF
F69F2445 DF4F9B17 AD2B417B E66C3710
""".replace(" ", "").replace("\n", ""))
self.assertEqual(tgcrypto.cbc256_decrypt(ciphertext, key, iv),
plaintext)
def test_cbc256_decrypt_invalid_iv_size(self):
with self.assertRaisesRegex(ValueError,
r"IV size must be exactly 16 bytes"):
tgcrypto.cbc256_decrypt(os.urandom(16), os.urandom(32),
os.urandom(15))
def test_cbc256_decrypt_invalid_key_size(self):
with self.assertRaisesRegex(ValueError,
r"Key size must be exactly 32 bytes"):
tgcrypto.cbc256_decrypt(os.urandom(16), os.urandom(31),
os.urandom(16))
def test_cbc256_decrypt_empty_data(self):
with self.assertRaisesRegex(ValueError, r"Data must not be empty"):
tgcrypto.cbc256_decrypt(b"", os.urandom(32), os.urandom(16))
def test_cbc256_decrypt_invalid_args_type(self):
with self.assertRaisesRegex(TypeError, self.TYPE_ERROR_PATTERN):
tgcrypto.cbc256_decrypt(1, 2, 3)
def test_cbc256_decrypt_invalid_args_count(self):
with self.assertRaisesRegex(
TypeError,
r"function takes exactly \d arguments \(\d given\)"):
tgcrypto.cbc256_decrypt(os.urandom(16), os.urandom(32))
def decrypt(self, data):
return tgcrypto.cbc256_decrypt(data, self.key, self.iv))