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 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 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 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_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_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 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 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 __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"""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"""
pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b""))
key = unhexlify(
b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f"
)
iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555658")
ct = b"""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"""
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_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 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_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 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_nonce(self):
key = b'A' * 32
nonce = b'P' * 24
cipher = ChaCha20.new(key=key, nonce=nonce)
self.assertEqual(nonce, cipher.nonce)