def test_round_trip(self): pt = b("A") * 1024 c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) ct = c1.encrypt(pt) self.assertEqual(c2.decrypt(ct), pt) self.assertEqual(c1.encrypt(b("")), b("")) self.assertEqual(c2.decrypt(b("")), b(""))
def runTest(self): data = b"0123" key = b"9" * 32 nonce = b"t" * 8 # Encryption data_mv = memoryview(bytearray(data)) key_mv = memoryview(bytearray(key)) nonce_mv = memoryview(bytearray(nonce)) cipher1 = ChaCha20.new(key=key, nonce=nonce) ct = cipher1.encrypt(data) cipher2 = ChaCha20.new(key=key_mv, nonce=nonce_mv) key_mv[:1] = b'\xFF' nonce_mv[:1] = b'\xFF' ct_test = cipher2.encrypt(data_mv) self.assertEqual(ct, ct_test) self.assertEqual(cipher1.nonce, cipher2.nonce) # Decryption key_mv = memoryview(bytearray(key)) nonce_mv = memoryview(bytearray(nonce)) ct_mv = memoryview(bytearray(ct)) cipher3 = ChaCha20.new(key=key_mv, nonce=nonce_mv) key_mv[:1] = b'\xFF' nonce_mv[:1] = b'\xFF' pt_test = cipher3.decrypt(ct_mv) self.assertEqual(data, pt_test)
def runTest(self): # Encryption data = b("0123") key = b("9") * 32 nonce = b("t") * 8 cipher1 = ChaCha20.new(key=key, nonce=nonce) ref1 = cipher1.encrypt(data) cipher2 = ChaCha20.new(key=bytearray(key), nonce=bytearray(nonce)) ref2 = cipher2.encrypt(bytearray(data)) self.assertEqual(ref1, ref2) self.assertEqual(cipher1.nonce, cipher2.nonce) # Decryption cipher3 = ChaCha20.new(key=key, nonce=nonce) ref3 = cipher3.decrypt(data) cipher4 = ChaCha20.new(key=bytearray(key), nonce=bytearray(nonce)) ref4 = cipher4.decrypt(bytearray(data)) self.assertEqual(ref3, ref4)
def test_eiter_encrypt_or_decrypt(self): """Verify that a cipher cannot be used for both decrypting and encrypting""" c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c1.encrypt(b("8")) self.assertRaises(TypeError, c1.decrypt, b("9")) c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8) c2.decrypt(b("8")) self.assertRaises(TypeError, c2.encrypt, b("9"))
def test_nonce(self): key = b'A' * 32 nonce1 = b'P' * 8 cipher1 = ChaCha20.new(key=key, nonce=nonce1) self.assertEqual(nonce1, cipher1.nonce) nonce2 = b'Q' * 12 cipher2 = ChaCha20.new(key=key, nonce=nonce2) self.assertEqual(nonce2, cipher2.nonce)
def test_seek(self): cipher1 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8) offset = 64 * 900 + 7 pt = b("1") * 64 cipher1.encrypt(b("0") * offset) ct1 = cipher1.encrypt(pt) cipher2 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8) cipher2.seek(offset) ct2 = cipher2.encrypt(pt) self.assertEquals(ct1, ct2)
def get_cipher(self, protected_stream_key): key_hash = hashlib.sha512(protected_stream_key).digest() key = key_hash[:32] nonce = key_hash[32:44] return ChaCha20.new( key=key, nonce=nonce )
def runTest(self): # Encrypt/Decrypt data and test output parameter key = b'4' * 32 nonce = b'5' * 8 cipher = ChaCha20.new(key=key, nonce=nonce) pt = b'5' * 16 ct = cipher.encrypt(pt) output = bytearray(16) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) import sys if sys.version[:3] != '2.6': output = memoryview(bytearray(16)) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * 16) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * 16) shorter_output = bytearray(7) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
def generate_stream(self, key, length): """ The PRG; key is 32 bytes, output is of size length """ assert len(key) == 32 nonce = b"\x00" * 8 # it's OK to use zero nonce because we only use it once c = ChaCha20.new(key=key, nonce=nonce) return c.encrypt(b"\x00" * length)
def generate_tls_chacha20(key, nonce_or_iv): nonce = nonce_or_iv cipher = ChaCha20.new(key=key, nonce=nonce) def do_computation(msg: bytes): cipher.encrypt(msg) return do_computation
def runTest(self): # Encrypt/Decrypt data and test output parameter key = b'4' * 32 nonce = b'5' * 8 cipher = ChaCha20.new(key=key, nonce=nonce) pt = b'5' * 300 ct = cipher.encrypt(pt) output = bytearray(len(pt)) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) output = memoryview(bytearray(len(pt))) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * len(pt)) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * len(pt)) shorter_output = bytearray(len(pt) - 1) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
def create_block_cipher_key(self, secret): """ Compute a block cipher key using the secret """ assert len(secret) == 32 stream_cipher_key = self.digest.create_stream_cipher_key(secret) nonce = b"\x00" * 8 # it's OK to use zero nonce because we only use it once c = ChaCha20.new(key=stream_cipher_key, nonce=nonce) key = c.encrypt(b"\x00" * Chacha20_Blake2b_Lioness.KEY_LEN) assert len(key) == Chacha20_Blake2b_Lioness.KEY_LEN return key
def test_streaming(self): """Verify that an arbitrary number of bytes can be encrypted/decrypted""" from Cryptodome.Hash import SHA1 segments = (1, 3, 5, 7, 11, 17, 23) total = sum(segments) pt = b("") while len(pt) < total: pt += SHA1.new(pt).digest() cipher1 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) ct = cipher1.encrypt(pt) cipher2 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) cipher3 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8) idx = 0 for segment in segments: self.assertEqual(cipher2.decrypt(ct[idx:idx+segment]), pt[idx:idx+segment]) self.assertEqual(cipher3.encrypt(pt[idx:idx+segment]), ct[idx:idx+segment]) idx += segment
def pyCrypto(): import Cryptodome from Cryptodome.Cipher import AES, ChaCha20, DES, DES3, ARC2, ARC4, Blowfish, CAST, PKCS1_v1_5, PKCS1_OAEP, ChaCha20_Poly1305, Salsa20 from Cryptodome.PublicKey import ElGamal Cryptodome.Cipher.AES.new() # Noncompliant Cryptodome.Other.AES.new() # OK AES.new(key=key) # Noncompliant ChaCha20.new(key=key) # Noncompliant DES.new(key=key) # Noncompliant DES3.new(key=key) # Noncompliant ARC2.new(key=key) # Noncompliant ARC4.new(key=key) # Noncompliant Blowfish.new(key=key) # Noncompliant CAST.new(key=key) # Noncompliant PKCS1_v1_5.new(key=key) # Noncompliant PKCS1_OAEP.new(key=key) # Noncompliant ChaCha20_Poly1305.new(key=key) # Noncompliant Salsa20.new(key=key) # Noncompliant ElGamal.generate(key_size) # Noncompliant
def runTest(self): # Encrypt/Decrypt data and test output parameter key = b'4' * 32 nonce = b'5' * 8 cipher = ChaCha20.new(key=key, nonce=nonce) pt = b'5' * 16 ct = cipher.encrypt(pt) output = bytearray(16) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.encrypt(pt, output=output) self.assertEqual(ct, output) self.assertEqual(res, None) cipher = ChaCha20.new(key=key, nonce=nonce) res = cipher.decrypt(ct, output=output) self.assertEqual(pt, output) self.assertEqual(res, None) import sys if sys.version[:3] != '2.6': output = memoryview(bytearray(16)) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.encrypt(pt, output=output) self.assertEqual(ct, output) cipher = ChaCha20.new(key=key, nonce=nonce) cipher.decrypt(ct, output=output) self.assertEqual(pt, output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16) shorter_output = bytearray(7) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output) cipher = ChaCha20.new(key=key, nonce=nonce) self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
def decrypt(self, file_path, password): private_key = self.get_private_key(password) if private_key is None: return {'status': False, 'msg': "Cannot get private key"} with open(file_path, 'rb') as fi: try: msg = json.loads(fi.read()) except ValueError: return {'status': False, 'msg': "File structure is damaged"} for key, value in msg.iteritems(): msg[key] = b64decode(value) secret_key = PKCS1_OAEP.new(private_key).decrypt(msg['secret_key']) try: # init cipher if msg['alg'] == ALG_OPTIONS[0]: cipher = AES.new(secret_key, AES.MODE_EAX, msg['nonce']) elif msg['alg'] == ALG_OPTIONS[1]: cipher = AES.new(secret_key, AES.MODE_OCB, msg['nonce']) elif msg['alg'] == ALG_OPTIONS[2]: cipher = AES.new(secret_key, AES.MODE_CFB, msg['iv']) elif msg['alg'] == ALG_OPTIONS[3]: cipher = AES.new(secret_key, AES.MODE_CTR, msg['nonce']) elif msg['alg'] == ALG_OPTIONS[4]: cipher = DES.new(secret_key, DES.MODE_OFB, iv=msg['iv']) elif msg['alg'] == ALG_OPTIONS[5]: cipher = ARC2.new(secret_key, ARC2.MODE_CFB) elif msg['alg'] == ALG_OPTIONS[6]: cipher = ARC4.new(secret_key) elif msg['alg'] == ALG_OPTIONS[7]: cipher = ChaCha20.new(key=secret_key, nonce=msg['nonce']) elif msg['alg'] == ALG_OPTIONS[8]: cipher = Salsa20.new(key=secret_key, nonce=msg['nonce']) else: return {'status': False, 'msg': "Cannot define the algorithm used to encrypt this file"} # decrypt and verify if msg['alg'] in ALG_OPTIONS[1:3]: decrypted_msg = cipher.decrypt_and_verify(msg['cipher_text'], msg['tag']) elif msg['alg'] in ALG_OPTIONS[3:]: decrypted_msg = cipher.decrypt(msg['cipher_text']) SHA256.new(decrypted_msg).hexdigest(), msg['tag'] if SHA256.new(decrypted_msg).hexdigest() != msg['tag']: raise ValueError else: return {'status': False, 'msg': "Cannot define the algorithm used to encrypt this file"} except ValueError, KeyError: return {'status': False, 'msg': "Decrypt failed, you are not the owner of this file"} dir_path, file_name = os.path.split(file_path) with open(dir_path + '/' + msg['file_name'], 'wb') as fo: fo.write(decrypted_msg) return {'status': True, 'msg': "Successfully decrypted file %s" % file_path}
def test_seek_tv(self): # Test Vector #4, A.1 from # http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 key = bchr(0) + bchr(255) + bchr(0) * 30 nonce = bchr(0) * 8 cipher = ChaCha20.new(key=key, nonce=nonce) cipher.seek(64 * 2) expected_key_stream = unhexlify( b("72d54dfbf12ec44b362692df94137f32" "8fea8da73990265ec1bbbea1ae9af0ca" "13b25aa26cb4a648cb9b9d1be65b2c09" "24a66c54d545ec1b7374f4872e99f096")) ct = cipher.encrypt(bchr(0) * len(expected_key_stream)) self.assertEqual(expected_key_stream, ct)
def chacha20_encrypt(*, key: bytes, nonce: bytes, data: bytes) -> bytes: assert isinstance(key, (bytes, bytearray)) assert isinstance(nonce, (bytes, bytearray)) assert isinstance(data, (bytes, bytearray)) assert len(nonce) == 8, f"unexpected nonce size: {len(nonce)} (expected: 8)" if HAS_CRYPTODOME: cipher = CD_ChaCha20.new(key=key, nonce=nonce) return cipher.encrypt(data) if HAS_CRYPTOGRAPHY: nonce = bytes(8) + nonce # cryptography wants 16 byte nonces algo = CG_algorithms.ChaCha20(key=key, nonce=nonce) cipher = CG_Cipher(algo, mode=None, backend=CG_default_backend()) encryptor = cipher.encryptor() return encryptor.update(data) raise Exception("no chacha20 backend found")
def test_seek_tv(self): # Test Vector #4, A.1 from # http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04 key = bchr(0) + bchr(255) + bchr(0) * 30 nonce = bchr(0) * 8 cipher = ChaCha20.new(key=key, nonce=nonce) cipher.seek(64 * 2) expected_key_stream = unhexlify(b( "72d54dfbf12ec44b362692df94137f32" "8fea8da73990265ec1bbbea1ae9af0ca" "13b25aa26cb4a648cb9b9d1be65b2c09" "24a66c54d545ec1b7374f4872e99f096" )) ct = cipher.encrypt(bchr(0) * len(expected_key_stream)) self.assertEqual(expected_key_stream, ct)
def encrypt(self, key: bytes, data: bytes, nonce: Optional[bytes] = None) -> bytes: """ Encrypts buffer using ChaCha20 algorithm. :param key: Cryptographic key (32 bytes) :type key: bytes :param data: Buffer to be encrypted :type data: bytes :param nonce: Nonce value (8/12 bytes, defaults to `b"\\\\x00"*8` ) :type nonce: bytes, optional :return: Encrypted data :rtype: bytes """ if nonce is None: nonce = b"\x00" * 8 return ChaCha20Cipher.new(key=key, nonce=nonce).encrypt(data)
def write_file(self, location, file, data: bytes) -> int: root = self.fs['contents']['files'] if location != '/': path = location.strip('/').split('/') for j in path: for i in root: if j == i['name'] and i['type'] == 'dir': root = i['files'] break else: return 1 for i in root: if i['name'] == file: cipher = ChaCha20.new(key=self.key[:32], nonce=b64decode(i['nonce'])) i['contents'] = b64encode(cipher.encrypt(data)).decode() return 0 else: return 1
def read_file(self, location, file): root = self.fs['contents']['files'] if location != '/': path = location.strip('/').split('/') for j in path: for i in root: if j == i['name'] and i['type'] == 'dir': root = i['files'] break else: return 1 for i in root: if i['name'] == file: data = b64decode(i['contents']) cipher = ChaCha20.new(key=self.key[:32], nonce=b64decode(i['nonce'])) return cipher.decrypt(data) else: return 1
def __init__(self, key, nonce): """Initialize a ChaCha20-Poly1305 AEAD cipher object See also `new()` at the module level.""" self.nonce = _copy_bytes(None, None, nonce) self._next = (self.update, self.encrypt, self.decrypt, self.digest, self.verify) self._authenticator = Poly1305.new(key=key, nonce=nonce, cipher=ChaCha20) self._cipher = ChaCha20.new(key=key, nonce=nonce) self._cipher.seek(64) # Block counter starts at 1 self._len_aad = 0 self._len_ct = 0 self._mac_tag = None self._status = _CipherStatus.PROCESSING_AUTH_DATA
def test_encrypt(self): # Section A.3.2 pt = b""" 5468652064686f6c65202870726f6e6f756e6365642022646f6c652229206973 20616c736f206b6e6f776e2061732074686520417369617469632077696c6420 646f672c2072656420646f672c20616e642077686973746c696e6720646f672e 2049742069732061626f7574207468652073697a65206f662061204765726d61 6e20736865706865726420627574206c6f6f6b73206d6f7265206c696b652061 206c6f6e672d6c656767656420666f782e205468697320686967686c7920656c 757369766520616e6420736b696c6c6564206a756d70657220697320636c6173 736966696564207769746820776f6c7665732c20636f796f7465732c206a6163 6b616c732c20616e6420666f78657320696e20746865207461786f6e6f6d6963 2066616d696c792043616e696461652e""" pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b"")) key = unhexlify( b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f" ) iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555658") ct = b""" 7d0a2e6b7f7c65a236542630294e063b7ab9b555a5d5149aa21e4ae1e4fbce87 ecc8e08a8b5e350abe622b2ffa617b202cfad72032a3037e76ffdcdc4376ee05 3a190d7e46ca1de04144850381b9cb29f051915386b8a710b8ac4d027b8b050f 7cba5854e028d564e453b8a968824173fc16488b8970cac828f11ae53cabd201 12f87107df24ee6183d2274fe4c8b1485534ef2c5fbc1ec24bfc3663efaa08bc 047d29d25043532db8391a8a3d776bf4372a6955827ccb0cdd4af403a7ce4c63 d595c75a43e045f0cce1f29c8b93bd65afc5974922f214a40b7c402cdb91ae73 c0b63615cdad0480680f16515a7ace9d39236464328a37743ffc28f4ddb324f4 d0f5bbdc270c65b1749a6efff1fbaa09536175ccd29fb9e6057b307320d31683 8a9c71f70b5b5907a66f7ea49aadc409""" ct = unhexlify(ct.replace(b"\n", b"").replace(b" ", b"")) cipher = ChaCha20.new(key=key, nonce=iv) cipher.seek(64) # Counter = 1 ct_test = cipher.encrypt(pt) self.assertEqual(ct, ct_test)
def test_default_nonce(self): cipher1 = ChaCha20.new(key=bchr(1) * 32) cipher2 = ChaCha20.new(key=bchr(1) * 32) self.assertEquals(len(cipher1.nonce), 8) self.assertNotEqual(cipher1.nonce, cipher2.nonce)
def generate_cipher_stream(stream_key: bytes, num_bytes: int) -> bytes: cipher = ChaCha20.new(key=stream_key, nonce=bytes(8)) return cipher.encrypt(bytes(num_bytes))
def __init__(self, seed_string): assert isinstance(seed_string, str) and len(seed_string) == 64 self.cipher = ChaCha20.new(key=binascii.unhexlify(seed_string), nonce=b"\x00" * 8)
def get_cipher(self, master_key, encryption_iv): return ChaCha20.new(key=master_key, nonce=encryption_iv)
def test_rfc7539(self): # from https://tools.ietf.org/html/rfc7539 Annex A.1 # Each item is: key, nonce, block #, plaintext, ciphertext tvs = [ # Test Vector #1 ( "00"*32, "00"*12, 0, "00"*16*4, "76b8e0ada0f13d90405d6ae55386bd28" "bdd219b8a08ded1aa836efcc8b770dc7" "da41597c5157488d7724e03fb8d84a37" "6a43b8f41518a11cc387b669b2ee6586" ), # Test Vector #2 ( "00"*31 + "01", "00"*11 + "02", 1, "416e79207375626d697373696f6e2074" "6f20746865204945544620696e74656e" "6465642062792074686520436f6e7472" "696275746f7220666f72207075626c69" "636174696f6e20617320616c6c206f72" "2070617274206f6620616e2049455446" "20496e7465726e65742d447261667420" "6f722052464320616e6420616e792073" "746174656d656e74206d616465207769" "7468696e2074686520636f6e74657874" "206f6620616e20494554462061637469" "7669747920697320636f6e7369646572" "656420616e20224945544620436f6e74" "7269627574696f6e222e205375636820" "73746174656d656e747320696e636c75" "6465206f72616c2073746174656d656e" "747320696e2049455446207365737369" "6f6e732c2061732077656c6c20617320" "7772697474656e20616e6420656c6563" "74726f6e696320636f6d6d756e696361" "74696f6e73206d61646520617420616e" "792074696d65206f7220706c6163652c" "20776869636820617265206164647265" "7373656420746f", "a3fbf07df3fa2fde4f376ca23e827370" "41605d9f4f4f57bd8cff2c1d4b7955ec" "2a97948bd3722915c8f3d337f7d37005" "0e9e96d647b7c39f56e031ca5eb6250d" "4042e02785ececfa4b4bb5e8ead0440e" "20b6e8db09d881a7c6132f420e527950" "42bdfa7773d8a9051447b3291ce1411c" "680465552aa6c405b7764d5e87bea85a" "d00f8449ed8f72d0d662ab052691ca66" "424bc86d2df80ea41f43abf937d3259d" "c4b2d0dfb48a6c9139ddd7f76966e928" "e635553ba76c5c879d7b35d49eb2e62b" "0871cdac638939e25e8a1e0ef9d5280f" "a8ca328b351c3c765989cbcf3daa8b6c" "cc3aaf9f3979c92b3720fc88dc95ed84" "a1be059c6499b9fda236e7e818b04b0b" "c39c1e876b193bfe5569753f88128cc0" "8aaa9b63d1a16f80ef2554d7189c411f" "5869ca52c5b83fa36ff216b9c1d30062" "bebcfd2dc5bce0911934fda79a86f6e6" "98ced759c3ff9b6477338f3da4f9cd85" "14ea9982ccafb341b2384dd902f3d1ab" "7ac61dd29c6f21ba5b862f3730e37cfd" "c4fd806c22f221" ), # Test Vector #3 ( "1c9240a5eb55d38af333888604f6b5f0" "473917c1402b80099dca5cbc207075c0", "00"*11 + "02", 42, "2754776173206272696c6c69672c2061" "6e642074686520736c6974687920746f" "7665730a446964206779726520616e64" "2067696d626c6520696e207468652077" "6162653a0a416c6c206d696d73792077" "6572652074686520626f726f676f7665" "732c0a416e6420746865206d6f6d6520" "7261746873206f757467726162652e", "62e6347f95ed87a45ffae7426f27a1df" "5fb69110044c0d73118effa95b01e5cf" "166d3df2d721caf9b21e5fb14c616871" "fd84c54f9d65b283196c7fe4f60553eb" "f39c6402c42234e32a356b3e764312a6" "1a5532055716ead6962568f87d3f3f77" "04c6a8d1bcd1bf4d50d6154b6da731b1" "87b58dfd728afa36757a797ac188d1" ) ] for tv in tvs: key = unhexlify(tv[0]) nonce = unhexlify(tv[1]) offset = tv[2] * 64 pt = unhexlify(tv[3]) ct_expect = unhexlify(tv[4]) cipher = ChaCha20.new(key=key, nonce=nonce) if offset != 0: cipher.seek(offset) ct = cipher.encrypt(pt) assert(ct == ct_expect)
def test_new_positive(self): cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*8) self.assertEqual(cipher.nonce, b"0" * 8) cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*12) self.assertEqual(cipher.nonce, b"0" * 12)
def runTest(self): for (key, nonce, stream) in self.tv: c = ChaCha20.new(key=unhexlify(b(key)), nonce=unhexlify(b(nonce))) ct = unhexlify(b(stream)) pt = b("\x00") * len(ct) self.assertEqual(c.encrypt(pt), ct)
def test_nonce(self): key = b'A' * 32 nonce = b'P' * 24 cipher = ChaCha20.new(key=key, nonce=nonce) self.assertEqual(nonce, cipher.nonce)