import unittest from hashlib import sha1 import telethon.helpers as utils from telethon.crypto import AES, Factorization from telethon.crypto import rsa from Crypto.PublicKey import RSA as PyCryptoRSA class CryptoTests(unittest.TestCase): def setUp(self): # Test known values self.key = b'\xd1\xf4MXy\x0c\xf8/z,\xe9\xf9\xa4\x17\x04\xd9C\xc9\xaba\x81\xf3\xf8\xdd\xcb\x0c6\x92\x01\x1f\xc2y' self.iv = b':\x02\x91x\x90Dj\xa6\x03\x90C\x08\x9e@X\xb5E\xffwy\xf3\x1c\xde\xde\xfbo\x8dm\xd6e.Z' self.plain_text = b'Non encrypted text :D' self.plain_text_padded = b'My len is more uniform, promise!' self.cipher_text = b'\xb6\xa7\xec.\xb9\x9bG\xcb\xe9{\x91[\x12\xfc\x84D\x1c' \ b'\x93\xd9\x17\x03\xcd\xd6\xb1D?\x98\xd2\xb5\xa5U\xfd' self.cipher_text_padded = b"W\xd1\xed'\x01\xa6c\xc3\xcb\xef\xaa\xe5\x1d\x1a" \ b"[\x1b\xdf\xcdI\x1f>Z\n\t\xb9\xd2=\xbaF\xd1\x8e'" @staticmethod def test_sha1(): string = 'Example string' hash_sum = sha1(string.encode('utf-8')).digest() expected = b'\nT\x92|\x8d\x06:)\x99\x04\x8e\xf8j?\xc4\x8e\xd3}m9' assert hash_sum == expected, 'Invalid sha1 hash_sum representation (should be {}, but is {})'\ .format(expected, hash_sum) def test_aes_encrypt(self): value = AES.encrypt_ige(self.plain_text, self.key, self.iv) take = 16 # Don't take all the bytes, since latest involve are random padding assert value[:take] == self.cipher_text[:take],\ ('Ciphered text ("{}") does not equal expected ("{}")' .format(value[:take], self.cipher_text[:take])) value = AES.encrypt_ige(self.plain_text_padded, self.key, self.iv) assert value == self.cipher_text_padded, ( 'Ciphered text ("{}") does not equal expected ("{}")' .format(value, self.cipher_text_padded)) def test_aes_decrypt(self): # The ciphered text must always be padded value = AES.decrypt_ige(self.cipher_text_padded, self.key, self.iv) assert value == self.plain_text_padded, ( 'Decrypted text ("{}") does not equal expected ("{}")' .format(value, self.plain_text_padded)) @staticmethod def test_calc_key(): shared_key = b'\xbc\xd2m\xb7\xcav\xf4][\x88\x83\' \xf3\x11\x8as\xd04\x941\xae' \ b'*O\x03\x86\x9a/H#\x1a\x8c\xb5j\xe9$\xe0IvCm^\xe70\x1a5C\t\x16' \ b'\x03\xd2\x9d\xa9\x89\xd6\xce\x08P\x0fdr\xa0\xb3\xeb\xfecv\x1a' \ b'\xdfJ\x14\x96\x98\x16\xa3G\xab\x04\x14!\\\xeb\n\xbcn\xdf\xc4%' \ b'\xc6\t\xb7\x16\x14\x9c\'\x81\x15=\xb0\xaf\x0e\x0bR\xaa\x0466s' \ b'\xf0\xcf\xb7\xb8>,D\x94x\xd7\xf8\xe0\x84\xcb%\xd3\x05\xb2\xe8' \ b'\x95Mr?\xa2\xe8In\xf9\x0b[E\x9b\xaa\x0cX\x7f\x0ei\xde\xeed\x1d' \ b'x/J\xce\xea^}0;\xa83B\xbbR\xa1\xbfe\x04\xb9\x1e\xa1"f=\xa5M@' \ b'\x9e\xdd\x81\x80\xc9\xa5\xfb\xfcg\xdd\x15\x03p!\x0ffD\x16\x892' \ b'\xea\xca\xb1A\x99O\xa94P\xa9\xa2\xc6;\xb2C9\x1dC5\xd2\r\xecL' \ b'\xd9\xabw-\x03\ry\xc2v\x17]\x02\x15\x0cBa\x97\xce\xa5\xb1\xe4]' \ b'\x8e\xe0,\xcfC{o\xfa\x99f\xa4pM\x00' # Calculate key being the client msg_key = b'\xba\x1a\xcf\xda\xa8^Cbl\xfa\xb6\x0c:\x9b\xb0\xfc' key, iv = utils.calc_key(shared_key, msg_key, client=True) expected_key = b"\xaf\xe3\x84Qm\xe0!\x0c\xd91\xe4\x9a\xa0v_gc" \ b"x\xa1\xb0\xc9\xbc\x16'v\xcf,\x9dM\xae\xc6\xa5" expected_iv = b'\xb8Q\xf3\xc5\xa3]\xc6\xdf\x9e\xe0Q\xbd"\x8d' \ b'\x13\t\x0e\x9a\x9d^8\xa2\xf8\xe7\x00w\xd9\xc1' \ b'\xa7\xa0\xf7\x0f' assert key == expected_key, 'Invalid key (expected ("{}"), got ("{}"))'.format( expected_key, key) assert iv == expected_iv, 'Invalid IV (expected ("{}"), got ("{}"))'.format( expected_iv, iv) # Calculate key being the server msg_key = b'\x86m\x92i\xcf\x8b\x93\xaa\x86K\x1fi\xd04\x83]' key, iv = utils.calc_key(shared_key, msg_key, client=False) expected_key = b'\xdd0X\xb6\x93\x8e\xc9y\xef\x83\xf8\x8cj' \ b'\xa7h\x03\xe2\xc6\xb16\xc5\xbb\xfc\xe7' \ b'\xdf\xd6\xb1g\xf7u\xcfk' expected_iv = b'\xdcL\xc2\x18\x01J"X\x86lb\xb6\xb547\xfd' \ b'\xe2a4\xb6\xaf}FS\xd7[\xe0N\r\x19\xfb\xbc' assert key == expected_key, 'Invalid key (expected ("{}"), got ("{}"))'.format( expected_key, key) assert iv == expected_iv, 'Invalid IV (expected ("{}"), got ("{}"))'.format( expected_iv, iv) @staticmethod def test_calc_msg_key(): value = utils.calc_msg_key(b'Some random message') expected = b'\xdfAa\xfc\x10\xab\x89\xd2\xfe\x19C\xf1\xdd~\xbf\x81' assert value == expected, 'Value ("{}") does not equal expected ("{}")'.format( value, expected) @staticmethod def test_generate_key_data_from_nonce(): server_nonce = int.from_bytes(b'The 16-bit nonce', byteorder='little') new_nonce = int.from_bytes(b'The new, calculated 32-bit nonce', byteorder='little') key, iv = utils.generate_key_data_from_nonce(server_nonce, new_nonce) expected_key = b'/\xaa\x7f\xa1\xfcs\xef\xa0\x99zh\x03M\xa4\x8e\xb4\xab\x0eE]b\x95|\xfe\xc0\xf8\x1f\xd4\xa0\xd4\xec\x91' expected_iv = b'\xf7\xae\xe3\xc8+=\xc2\xb8\xd1\xe1\x1b\x0e\x10\x07\x9fn\x9e\xdc\x960\x05\xf9\xea\xee\x8b\xa1h The ' assert key == expected_key, 'Key ("{}") does not equal expected ("{}")'.format( key, expected_key) assert iv == expected_iv, 'IV ("{}") does not equal expected ("{}")'.format( iv, expected_iv) @staticmethod def test_fingerprint_from_key(): assert rsa._compute_fingerprint(PyCryptoRSA.importKey( '-----BEGIN RSA PUBLIC KEY-----\n' 'MIIBCgKCAQEAwVACPi9w23mF3tBkdZz+zwrzKOaaQdr01vAbU4E1pvkfj4sqDsm6\n' 'lyDONS789sVoD/xCS9Y0hkkC3gtL1tSfTlgCMOOul9lcixlEKzwKENj1Yz/s7daS\n' 'an9tqw3bfUV/nqgbhGX81v/+7RFAEd+RwFnK7a+XYl9sluzHRyVVaTTveB2GazTw\n' 'Efzk2DWgkBluml8OREmvfraX3bkHZJTKX4EQSjBbbdJ2ZXIsRrYOXfaA+xayEGB+\n' '8hdlLmAjbCVfaigxX0CDqWeR1yFL9kwd9P0NsZRPsmoqVwMbMu7mStFai6aIhc3n\n' 'Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB\n' '-----END RSA PUBLIC KEY-----' )) == b'!k\xe8l\x02+\xb4\xc3', 'Wrong fingerprint calculated' @staticmethod def test_factorize(): pq = 3118979781119966969 p, q = Factorization.factorize(pq) if p > q: p, q = q, p assert p == 1719614201, 'Factorized pair did not yield the correct result' assert q == 1813767169, 'Factorized pair did not yield the correct result'