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# ===================================================================
#
# Copyright (c) 2014, Legrandin <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 os
import re
import unittest
from binascii import hexlify, unhexlify
from Crypto.Util.py3compat import b, tobytes, bchr
from Crypto.Util.strxor import strxor_c
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Cipher import ChaCha20
class ChaCha20Test(unittest.TestCase):
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_new_negative(self):
new = ChaCha20.new
self.assertRaises(TypeError, new)
self.assertRaises(TypeError, new, nonce=b("0"))
self.assertRaises(ValueError, new, nonce=b("0")*8, key=b("0"))
self.assertRaises(ValueError, new, nonce=b("0"), key=b("0")*32)
def test_default_nonce(self):
cipher1 = ChaCha20.new(key=bchr(1) * 32)
cipher2 = ChaCha20.new(key=bchr(1) * 32)
self.assertEqual(len(cipher1.nonce), 8)
self.assertNotEqual(cipher1.nonce, cipher2.nonce)
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_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_streaming(self):
"""Verify that an arbitrary number of bytes can be encrypted/decrypted"""
from Crypto.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_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.assertEqual(ct1, ct2)
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 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)
class XChaCha20Test(unittest.TestCase):
# From https://tools.ietf.org/html/draft-arciszewski-xchacha-03
def test_hchacha20(self):
# Section 2.2.1
from Crypto.Cipher.ChaCha20 import _HChaCha20
key = b"00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f:10:11:12:13:14:15:16:17:18:19:1a:1b:1c:1d:1e:1f"
key = unhexlify(key.replace(b":", b""))
nonce = b"00:00:00:09:00:00:00:4a:00:00:00:00:31:41:59:27"
nonce = unhexlify(nonce.replace(b":", b""))
subkey = _HChaCha20(key, nonce)
expected = b"82413b42 27b27bfe d30e4250 8a877d73 a0f9e4d5 8a74a853 c12ec413 26d3ecdc"
expected = unhexlify(expected.replace(b" ", b""))
self.assertEqual(subkey, expected)
def test_nonce(self):
key = b'A' * 32
nonce = b'P' * 24
cipher = ChaCha20.new(key=key, nonce=nonce)
self.assertEqual(nonce, cipher.nonce)
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)
class ByteArrayTest(unittest.TestCase):
"""Verify we can encrypt or decrypt bytearrays"""
def runTest(self):
data = b"0123"
key = b"9" * 32
nonce = b"t" * 8
# Encryption
data_ba = bytearray(data)
key_ba = bytearray(key)
nonce_ba = bytearray(nonce)
cipher1 = ChaCha20.new(key=key, nonce=nonce)
ct = cipher1.encrypt(data)
cipher2 = ChaCha20.new(key=key_ba, nonce=nonce_ba)
key_ba[:1] = b'\xFF'
nonce_ba[:1] = b'\xFF'
ct_test = cipher2.encrypt(data_ba)
self.assertEqual(ct, ct_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decryption
key_ba = bytearray(key)
nonce_ba = bytearray(nonce)
ct_ba = bytearray(ct)
cipher3 = ChaCha20.new(key=key_ba, nonce=nonce_ba)
key_ba[:1] = b'\xFF'
nonce_ba[:1] = b'\xFF'
pt_test = cipher3.decrypt(ct_ba)
self.assertEqual(data, pt_test)
class MemoryviewTest(unittest.TestCase):
"""Verify we can encrypt or decrypt bytearrays"""
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)
class ChaCha20_AGL_NIR(unittest.TestCase):
# From http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04
# and http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04
tv = [
( "00" * 32,
"00" * 8,
"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc"
"8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11c"
"c387b669b2ee6586"
"9f07e7be5551387a98ba977c732d080d"
"cb0f29a048e3656912c6533e32ee7aed"
"29b721769ce64e43d57133b074d839d5"
"31ed1f28510afb45ace10a1f4b794d6f"
),
( "00" * 31 + "01",
"00" * 8,
"4540f05a9f1fb296d7736e7b208e3c96eb4fe1834688d2604f450952"
"ed432d41bbe2a0b6ea7566d2a5d1e7e20d42af2c53d792b1c43fea81"
"7e9ad275ae546963"
"3aeb5224ecf849929b9d828db1ced4dd"
"832025e8018b8160b82284f3c949aa5a"
"8eca00bbb4a73bdad192b5c42f73f2fd"
"4e273644c8b36125a64addeb006c13a0"
),
( "00" * 32,
"00" * 7 + "01",
"de9cba7bf3d69ef5e786dc63973f653a0b49e015adbff7134fcb7df1"
"37821031e85a050278a7084527214f73efc7fa5b5277062eb7a0433e"
"445f41e3"
),
( "00" * 32,
"01" + "00" * 7,
"ef3fdfd6c61578fbf5cf35bd3dd33b8009631634d21e42ac33960bd1"
"38e50d32111e4caf237ee53ca8ad6426194a88545ddc497a0b466e7d"
"6bbdb0041b2f586b"
),
( "000102030405060708090a0b0c0d0e0f101112131415161718191a1b"
"1c1d1e1f",
"0001020304050607",
"f798a189f195e66982105ffb640bb7757f579da31602fc93ec01ac56"
"f85ac3c134a4547b733b46413042c9440049176905d3be59ea1c53f1"
"5916155c2be8241a38008b9a26bc35941e2444177c8ade6689de9526"
"4986d95889fb60e84629c9bd9a5acb1cc118be563eb9b3a4a472f82e"
"09a7e778492b562ef7130e88dfe031c79db9d4f7c7a899151b9a4750"
"32b63fc385245fe054e3dd5a97a5f576fe064025d3ce042c566ab2c5"
"07b138db853e3d6959660996546cc9c4a6eafdc777c040d70eaf46f7"
"6dad3979e5c5360c3317166a1c894c94a371876a94df7628fe4eaaf2"
"ccb27d5aaae0ad7ad0f9d4b6ad3b54098746d4524d38407a6deb3ab7"
"8fab78c9"
),
( "00" * 32,
"00" * 7 + "02",
"c2c64d378cd536374ae204b9ef933fcd"
"1a8b2288b3dfa49672ab765b54ee27c7"
"8a970e0e955c14f3a88e741b97c286f7"
"5f8fc299e8148362fa198a39531bed6d"
),
]
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)
class TestOutput(unittest.TestCase):
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 get_tests(config={}):
tests = []
tests += list_test_cases(ChaCha20Test)
tests += list_test_cases(XChaCha20Test)
tests.append(ChaCha20_AGL_NIR())
tests.append(ByteArrayTest())
tests.append(MemoryviewTest())
tests.append(TestOutput())
return tests
if __name__ == '__main__':
import unittest
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')