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# ===================================================================
#
# Copyright (c) 2018, Helder Eijs <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================
import unittest
from binascii import unhexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.SelfTest.loader import load_test_vectors_wycheproof
from Crypto.Util.py3compat import tobytes
from Crypto.Cipher import ChaCha20_Poly1305
from Crypto.Hash import SHAKE128
from Crypto.Util.strxor import strxor
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
class ChaCha20Poly1305Tests(unittest.TestCase):
key_256 = get_tag_random("key_256", 32)
nonce_96 = get_tag_random("nonce_96", 12)
data_128 = get_tag_random("data_128", 16)
def test_loopback(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_nonce(self):
# Nonce can only be 8 or 12 bytes
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=b'H' * 8)
self.assertEqual(len(cipher.nonce), 8)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=b'H' * 12)
self.assertEqual(len(cipher.nonce), 12)
# If not passed, the nonce is created randomly
cipher = ChaCha20_Poly1305.new(key=self.key_256)
nonce1 = cipher.nonce
cipher = ChaCha20_Poly1305.new(key=self.key_256)
nonce2 = cipher.nonce
self.assertEqual(len(nonce1), 12)
self.assertNotEqual(nonce1, nonce2)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
ct = cipher.encrypt(self.data_128)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertEqual(ct, cipher.encrypt(self.data_128))
def test_nonce_must_be_bytes(self):
self.assertRaises(TypeError,
ChaCha20_Poly1305.new,
key=self.key_256,
nonce=u'test12345678')
def test_nonce_length(self):
# nonce can only be 8 or 12 bytes long
self.assertRaises(ValueError,
ChaCha20_Poly1305.new,
key=self.key_256,
nonce=b'0' * 7)
self.assertRaises(ValueError,
ChaCha20_Poly1305.new,
key=self.key_256,
nonce=b'')
def test_block_size(self):
# Not based on block ciphers
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertFalse(hasattr(cipher, 'block_size'))
def test_nonce_attribute(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, a 12 bytes long nonce is randomly generated
nonce1 = ChaCha20_Poly1305.new(key=self.key_256).nonce
nonce2 = ChaCha20_Poly1305.new(key=self.key_256).nonce
self.assertEqual(len(nonce1), 12)
self.assertNotEqual(nonce1, nonce2)
def test_unknown_parameters(self):
self.assertRaises(TypeError,
ChaCha20_Poly1305.new,
key=self.key_256,
param=9)
def test_null_encryption_decryption(self):
for func in "encrypt", "decrypt":
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
result = getattr(cipher, func)(b"")
self.assertEqual(result, b"")
def test_either_encrypt_or_decrypt(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.decrypt(b"")
self.assertRaises(TypeError, cipher.encrypt, b"")
def test_data_must_be_bytes(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
def test_mac_len(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
_, mac = cipher.encrypt_and_digest(self.data_128)
self.assertEqual(len(mac), 16)
def test_invalid_mac(self):
from Crypto.Util.strxor import strxor_c
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data_128)
invalid_mac = strxor_c(mac, 0x01)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct,
invalid_mac)
def test_hex_mac(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.hexverify(mac_hex)
def test_message_chunks(self):
# Validate that both associated data and plaintext/ciphertext
# can be broken up in chunks of arbitrary length
auth_data = get_tag_random("authenticated data", 127)
plaintext = get_tag_random("plaintext", 127)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(auth_data)
ciphertext, ref_mac = cipher.encrypt_and_digest(plaintext)
def break_up(data, chunk_length):
return [data[i:i+chunk_length] for i in range(0, len(data),
chunk_length)]
# Encryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
pt2 = b""
for chunk in break_up(ciphertext, chunk_length):
pt2 += cipher.decrypt(chunk)
self.assertEqual(plaintext, pt2)
cipher.verify(ref_mac)
# Decryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
ct2 = b""
for chunk in break_up(plaintext, chunk_length):
ct2 += cipher.encrypt(chunk)
self.assertEqual(ciphertext, ct2)
self.assertEqual(cipher.digest(), ref_mac)
def test_bytearray(self):
# Encrypt
key_ba = bytearray(self.key_256)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data_128)
data_ba = bytearray(self.data_128)
cipher1 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher1.update(self.data_128)
ct = cipher1.encrypt(self.data_128)
tag = cipher1.digest()
cipher2 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
key_ba[:3] = b'\xFF\xFF\xFF'
nonce_ba[:3] = b'\xFF\xFF\xFF'
cipher2.update(header_ba)
header_ba[:3] = b'\xFF\xFF\xFF'
ct_test = cipher2.encrypt(data_ba)
data_ba[:3] = b'\x99\x99\x99'
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_ba = bytearray(self.key_256)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data_128)
ct_ba = bytearray(ct)
tag_ba = bytearray(tag)
del data_ba
cipher3 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
key_ba[:3] = b'\xFF\xFF\xFF'
nonce_ba[:3] = b'\xFF\xFF\xFF'
cipher3.update(header_ba)
header_ba[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt(ct_ba)
ct_ba[:3] = b'\xFF\xFF\xFF'
cipher3.verify(tag_ba)
self.assertEqual(pt_test, self.data_128)
def test_memoryview(self):
# Encrypt
key_mv = memoryview(bytearray(self.key_256))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data_128))
data_mv = memoryview(bytearray(self.data_128))
cipher1 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher1.update(self.data_128)
ct = cipher1.encrypt(self.data_128)
tag = cipher1.digest()
cipher2 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
key_mv[:3] = b'\xFF\xFF\xFF'
nonce_mv[:3] = b'\xFF\xFF\xFF'
cipher2.update(header_mv)
header_mv[:3] = b'\xFF\xFF\xFF'
ct_test = cipher2.encrypt(data_mv)
data_mv[:3] = b'\x99\x99\x99'
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_mv = memoryview(bytearray(self.key_256))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data_128))
ct_mv = memoryview(bytearray(ct))
tag_mv = memoryview(bytearray(tag))
del data_mv
cipher3 = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
key_mv[:3] = b'\xFF\xFF\xFF'
nonce_mv[:3] = b'\xFF\xFF\xFF'
cipher3.update(header_mv)
header_mv[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt(ct_mv)
ct_mv[:3] = b'\x99\x99\x99'
cipher3.verify(tag_mv)
self.assertEqual(pt_test, self.data_128)
class XChaCha20Poly1305Tests(unittest.TestCase):
def test_nonce(self):
# Nonce can only be 24 bytes
cipher = ChaCha20_Poly1305.new(key=b'Y' * 32,
nonce=b'H' * 24)
self.assertEqual(len(cipher.nonce), 24)
self.assertEqual(cipher.nonce, b'H' * 24)
def test_encrypt(self):
# From https://tools.ietf.org/html/draft-arciszewski-xchacha-03
# Section A.3.1
pt = b"""
4c616469657320616e642047656e746c656d656e206f662074686520636c6173
73206f66202739393a204966204920636f756c64206f6666657220796f75206f
6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73
637265656e20776f756c642062652069742e"""
pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b""))
aad = unhexlify(b"50515253c0c1c2c3c4c5c6c7")
key = unhexlify(b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555657")
ct = b"""
bd6d179d3e83d43b9576579493c0e939572a1700252bfaccbed2902c21396cbb
731c7f1b0b4aa6440bf3a82f4eda7e39ae64c6708c54c216cb96b72e1213b452
2f8c9ba40db5d945b11b69b982c1bb9e3f3fac2bc369488f76b2383565d3fff9
21f9664c97637da9768812f615c68b13b52e"""
ct = unhexlify(ct.replace(b"\n", b"").replace(b" ", b""))
tag = unhexlify(b"c0875924c1c7987947deafd8780acf49")
cipher = ChaCha20_Poly1305.new(key=key, nonce=iv)
cipher.update(aad)
ct_test, tag_test = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
cipher = ChaCha20_Poly1305.new(key=key, nonce=iv)
cipher.update(aad)
cipher.decrypt_and_verify(ct, tag)
class ChaCha20Poly1305FSMTests(unittest.TestCase):
key_256 = get_tag_random("key_256", 32)
nonce_96 = get_tag_random("nonce_96", 12)
data_128 = get_tag_random("data_128", 16)
def test_valid_init_encrypt_decrypt_digest_verify(self):
# No authenticated data, fixed plaintext
# Verify path INIT->ENCRYPT->DIGEST
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
# Verify path INIT->DECRYPT->VERIFY
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_update_digest_verify(self):
# No plaintext, fixed authenticated data
# Verify path INIT->UPDATE->DIGEST
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
cipher.verify(mac)
def test_valid_full_path(self):
# Fixed authenticated data, fixed plaintext
# Verify path INIT->UPDATE->ENCRYPT->DIGEST
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
# Verify path INIT->UPDATE->DECRYPT->VERIFY
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
mac = cipher.digest()
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.verify(mac)
def test_valid_multiple_encrypt_or_decrypt(self):
for method_name in "encrypt", "decrypt":
for auth_data in (None, b"333", self.data_128,
self.data_128 + b"3"):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
if auth_data is not None:
cipher.update(auth_data)
method = getattr(cipher, method_name)
method(self.data_128)
method(self.data_128)
method(self.data_128)
method(self.data_128)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
first_mac = cipher.digest()
for x in range(4):
self.assertEqual(first_mac, cipher.digest())
# Multiple calls to verify
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
for x in range(5):
cipher.verify(first_mac)
def test_valid_encrypt_and_digest_decrypt_and_verify(self):
# encrypt_and_digest
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
ct, mac = cipher.encrypt_and_digest(self.data_128)
# decrypt_and_verify
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.update(self.data_128)
pt = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(self.data_128, pt)
def test_invalid_mixing_encrypt_decrypt(self):
# Once per method, with or without assoc. data
for method1_name, method2_name in (("encrypt", "decrypt"),
("decrypt", "encrypt")):
for assoc_data_present in (True, False):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
if assoc_data_present:
cipher.update(self.data_128)
getattr(cipher, method1_name)(self.data_128)
self.assertRaises(TypeError, getattr(cipher, method2_name),
self.data_128)
def test_invalid_encrypt_or_update_after_digest(self):
for method_name in "encrypt", "update":
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.encrypt(self.data_128)
cipher.digest()
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data_128)
def test_invalid_decrypt_or_update_after_verify(self):
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
for method_name in "decrypt", "update":
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
cipher = ChaCha20_Poly1305.new(key=self.key_256,
nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
def compact(x):
return unhexlify(x.replace(" ", "").replace(":", ""))
class TestVectorsRFC(unittest.TestCase):
"""Test cases from RFC7539"""
# AAD, PT, CT, MAC, KEY, NONCE
test_vectors_hex = [
( '50 51 52 53 c0 c1 c2 c3 c4 c5 c6 c7',
'4c 61 64 69 65 73 20 61 6e 64 20 47 65 6e 74 6c'
'65 6d 65 6e 20 6f 66 20 74 68 65 20 63 6c 61 73'
'73 20 6f 66 20 27 39 39 3a 20 49 66 20 49 20 63'
'6f 75 6c 64 20 6f 66 66 65 72 20 79 6f 75 20 6f'
'6e 6c 79 20 6f 6e 65 20 74 69 70 20 66 6f 72 20'
'74 68 65 20 66 75 74 75 72 65 2c 20 73 75 6e 73'
'63 72 65 65 6e 20 77 6f 75 6c 64 20 62 65 20 69'
'74 2e',
'd3 1a 8d 34 64 8e 60 db 7b 86 af bc 53 ef 7e c2'
'a4 ad ed 51 29 6e 08 fe a9 e2 b5 a7 36 ee 62 d6'
'3d be a4 5e 8c a9 67 12 82 fa fb 69 da 92 72 8b'
'1a 71 de 0a 9e 06 0b 29 05 d6 a5 b6 7e cd 3b 36'
'92 dd bd 7f 2d 77 8b 8c 98 03 ae e3 28 09 1b 58'
'fa b3 24 e4 fa d6 75 94 55 85 80 8b 48 31 d7 bc'
'3f f4 de f0 8e 4b 7a 9d e5 76 d2 65 86 ce c6 4b'
'61 16',
'1a:e1:0b:59:4f:09:e2:6a:7e:90:2e:cb:d0:60:06:91',
'80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f'
'90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f',
'07 00 00 00' + '40 41 42 43 44 45 46 47',
),
( 'f3 33 88 86 00 00 00 00 00 00 4e 91',
'49 6e 74 65 72 6e 65 74 2d 44 72 61 66 74 73 20'
'61 72 65 20 64 72 61 66 74 20 64 6f 63 75 6d 65'
'6e 74 73 20 76 61 6c 69 64 20 66 6f 72 20 61 20'
'6d 61 78 69 6d 75 6d 20 6f 66 20 73 69 78 20 6d'
'6f 6e 74 68 73 20 61 6e 64 20 6d 61 79 20 62 65'
'20 75 70 64 61 74 65 64 2c 20 72 65 70 6c 61 63'
'65 64 2c 20 6f 72 20 6f 62 73 6f 6c 65 74 65 64'
'20 62 79 20 6f 74 68 65 72 20 64 6f 63 75 6d 65'
'6e 74 73 20 61 74 20 61 6e 79 20 74 69 6d 65 2e'
'20 49 74 20 69 73 20 69 6e 61 70 70 72 6f 70 72'
'69 61 74 65 20 74 6f 20 75 73 65 20 49 6e 74 65'
'72 6e 65 74 2d 44 72 61 66 74 73 20 61 73 20 72'
'65 66 65 72 65 6e 63 65 20 6d 61 74 65 72 69 61'
'6c 20 6f 72 20 74 6f 20 63 69 74 65 20 74 68 65'
'6d 20 6f 74 68 65 72 20 74 68 61 6e 20 61 73 20'
'2f e2 80 9c 77 6f 72 6b 20 69 6e 20 70 72 6f 67'
'72 65 73 73 2e 2f e2 80 9d',
'64 a0 86 15 75 86 1a f4 60 f0 62 c7 9b e6 43 bd'
'5e 80 5c fd 34 5c f3 89 f1 08 67 0a c7 6c 8c b2'
'4c 6c fc 18 75 5d 43 ee a0 9e e9 4e 38 2d 26 b0'
'bd b7 b7 3c 32 1b 01 00 d4 f0 3b 7f 35 58 94 cf'
'33 2f 83 0e 71 0b 97 ce 98 c8 a8 4a bd 0b 94 81'
'14 ad 17 6e 00 8d 33 bd 60 f9 82 b1 ff 37 c8 55'
'97 97 a0 6e f4 f0 ef 61 c1 86 32 4e 2b 35 06 38'
'36 06 90 7b 6a 7c 02 b0 f9 f6 15 7b 53 c8 67 e4'
'b9 16 6c 76 7b 80 4d 46 a5 9b 52 16 cd e7 a4 e9'
'90 40 c5 a4 04 33 22 5e e2 82 a1 b0 a0 6c 52 3e'
'af 45 34 d7 f8 3f a1 15 5b 00 47 71 8c bc 54 6a'
'0d 07 2b 04 b3 56 4e ea 1b 42 22 73 f5 48 27 1a'
'0b b2 31 60 53 fa 76 99 19 55 eb d6 31 59 43 4e'
'ce bb 4e 46 6d ae 5a 10 73 a6 72 76 27 09 7a 10'
'49 e6 17 d9 1d 36 10 94 fa 68 f0 ff 77 98 71 30'
'30 5b ea ba 2e da 04 df 99 7b 71 4d 6c 6f 2c 29'
'a6 ad 5c b4 02 2b 02 70 9b',
'ee ad 9d 67 89 0c bb 22 39 23 36 fe a1 85 1f 38',
'1c 92 40 a5 eb 55 d3 8a f3 33 88 86 04 f6 b5 f0'
'47 39 17 c1 40 2b 80 09 9d ca 5c bc 20 70 75 c0',
'00 00 00 00 01 02 03 04 05 06 07 08',
)
]
test_vectors = [[unhexlify(x.replace(" ", "").replace(":", "")) for x in tv] for tv in test_vectors_hex]
def runTest(self):
for assoc_data, pt, ct, mac, key, nonce in self.test_vectors:
# Encrypt
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
cipher.update(assoc_data)
ct2, mac2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(mac, mac2)
# Decrypt
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
cipher.update(assoc_data)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
class TestVectorsWycheproof(unittest.TestCase):
def __init__(self, wycheproof_warnings):
unittest.TestCase.__init__(self)
self._wycheproof_warnings = wycheproof_warnings
self._id = "None"
def load_tests(self, filename):
def filter_tag(group):
return group['tagSize'] // 8
def filter_algo(root):
return root['algorithm']
result = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
filename,
"Wycheproof ChaCha20-Poly1305",
root_tag={'algo': filter_algo},
group_tag={'tag_size': filter_tag})
return result
def setUp(self):
self.tv = []
self.tv.extend(self.load_tests("chacha20_poly1305_test.json"))
self.tv.extend(self.load_tests("xchacha20_poly1305_test.json"))
def shortDescription(self):
return self._id
def warn(self, tv):
if tv.warning and self._wycheproof_warnings:
import warnings
warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment))
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt %s Test #%s" % (tv.algo, tv.id)
try:
cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv)
except ValueError as e:
assert len(tv.iv) not in (8, 12) and "Nonce must be" in str(e)
return
cipher.update(tv.aad)
ct, tag = cipher.encrypt_and_digest(tv.msg)
if tv.valid:
self.assertEqual(ct, tv.ct)
self.assertEqual(tag, tv.tag)
self.warn(tv)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt %s Test #%s" % (tv.algo, tv.id)
try:
cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv)
except ValueError as e:
assert len(tv.iv) not in (8, 12) and "Nonce must be" in str(e)
return
cipher.update(tv.aad)
try:
pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
except ValueError:
assert not tv.valid
else:
assert tv.valid
self.assertEqual(pt, tv.msg)
self.warn(tv)
def test_corrupt_decrypt(self, tv):
self._id = "Wycheproof Corrupt Decrypt ChaCha20-Poly1305 Test #" + str(tv.id)
if len(tv.iv) == 0 or len(tv.ct) < 1:
return
cipher = ChaCha20_Poly1305.new(key=tv.key, nonce=tv.iv)
cipher.update(tv.aad)
ct_corrupt = strxor(tv.ct, b"\x00" * (len(tv.ct) - 1) + b"\x01")
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct_corrupt, tv.tag)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
self.test_corrupt_decrypt(tv)
class TestOutput(unittest.TestCase):
def runTest(self):
# Encrypt/Decrypt data and test output parameter
key = b'4' * 32
nonce = b'5' * 12
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
pt = b'5' * 16
ct = cipher.encrypt(pt)
output = bytearray(16)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
res = cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
res = cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
output = memoryview(bytearray(16))
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16)
shorter_output = bytearray(7)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
def get_tests(config={}):
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(ChaCha20Poly1305Tests)
tests += list_test_cases(XChaCha20Poly1305Tests)
tests += list_test_cases(ChaCha20Poly1305FSMTests)
tests += [TestVectorsRFC()]
tests += [TestVectorsWycheproof(wycheproof_warnings)]
tests += [TestOutput()]
return tests
if __name__ == '__main__':
def suite():
unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
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