519 lines
20 KiB
Python
519 lines
20 KiB
Python
# ===================================================================
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#
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# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ===================================================================
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import os
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import re
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import unittest
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from binascii import hexlify, unhexlify
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from Crypto.Util.py3compat import b, tobytes, bchr, _memoryview
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from Crypto.Util.strxor import strxor_c
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from Crypto.SelfTest.st_common import list_test_cases
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from Crypto.Cipher import ChaCha20
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class ChaCha20Test(unittest.TestCase):
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def test_new_positive(self):
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cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*8)
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self.assertEqual(cipher.nonce, b"0" * 8)
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cipher = ChaCha20.new(key=b("0")*32, nonce=b"0"*12)
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self.assertEqual(cipher.nonce, b"0" * 12)
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def test_new_negative(self):
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new = ChaCha20.new
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self.assertRaises(TypeError, new)
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self.assertRaises(TypeError, new, nonce=b("0"))
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self.assertRaises(ValueError, new, nonce=b("0")*8, key=b("0"))
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self.assertRaises(ValueError, new, nonce=b("0"), key=b("0")*32)
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def test_default_nonce(self):
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cipher1 = ChaCha20.new(key=bchr(1) * 32)
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cipher2 = ChaCha20.new(key=bchr(1) * 32)
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self.assertEquals(len(cipher1.nonce), 8)
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self.assertNotEqual(cipher1.nonce, cipher2.nonce)
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def test_eiter_encrypt_or_decrypt(self):
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"""Verify that a cipher cannot be used for both decrypting and encrypting"""
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c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8)
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c1.encrypt(b("8"))
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self.assertRaises(TypeError, c1.decrypt, b("9"))
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c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8)
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c2.decrypt(b("8"))
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self.assertRaises(TypeError, c2.encrypt, b("9"))
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def test_round_trip(self):
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pt = b("A") * 1024
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c1 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8)
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c2 = ChaCha20.new(key=b("5") * 32, nonce=b("6") * 8)
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ct = c1.encrypt(pt)
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self.assertEqual(c2.decrypt(ct), pt)
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self.assertEqual(c1.encrypt(b("")), b(""))
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self.assertEqual(c2.decrypt(b("")), b(""))
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def test_streaming(self):
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"""Verify that an arbitrary number of bytes can be encrypted/decrypted"""
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from Crypto.Hash import SHA1
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segments = (1, 3, 5, 7, 11, 17, 23)
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total = sum(segments)
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pt = b("")
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while len(pt) < total:
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pt += SHA1.new(pt).digest()
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cipher1 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8)
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ct = cipher1.encrypt(pt)
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cipher2 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8)
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cipher3 = ChaCha20.new(key=b("7") * 32, nonce=b("t") * 8)
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idx = 0
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for segment in segments:
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self.assertEqual(cipher2.decrypt(ct[idx:idx+segment]), pt[idx:idx+segment])
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self.assertEqual(cipher3.encrypt(pt[idx:idx+segment]), ct[idx:idx+segment])
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idx += segment
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def test_seek(self):
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cipher1 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8)
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offset = 64 * 900 + 7
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pt = b("1") * 64
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cipher1.encrypt(b("0") * offset)
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ct1 = cipher1.encrypt(pt)
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cipher2 = ChaCha20.new(key=b("9") * 32, nonce=b("e") * 8)
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cipher2.seek(offset)
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ct2 = cipher2.encrypt(pt)
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self.assertEquals(ct1, ct2)
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def test_seek_tv(self):
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# Test Vector #4, A.1 from
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# http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04
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key = bchr(0) + bchr(255) + bchr(0) * 30
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nonce = bchr(0) * 8
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cipher = ChaCha20.new(key=key, nonce=nonce)
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cipher.seek(64 * 2)
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expected_key_stream = unhexlify(b(
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"72d54dfbf12ec44b362692df94137f32"
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"8fea8da73990265ec1bbbea1ae9af0ca"
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"13b25aa26cb4a648cb9b9d1be65b2c09"
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"24a66c54d545ec1b7374f4872e99f096"
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))
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ct = cipher.encrypt(bchr(0) * len(expected_key_stream))
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self.assertEqual(expected_key_stream, ct)
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def test_rfc7539(self):
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# from https://tools.ietf.org/html/rfc7539 Annex A.1
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# Each item is: key, nonce, block #, plaintext, ciphertext
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tvs = [
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# Test Vector #1
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(
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"00"*32,
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"00"*12,
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0,
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"00"*16*4,
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"76b8e0ada0f13d90405d6ae55386bd28"
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"bdd219b8a08ded1aa836efcc8b770dc7"
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"da41597c5157488d7724e03fb8d84a37"
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"6a43b8f41518a11cc387b669b2ee6586"
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),
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# Test Vector #2
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(
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"00"*31 + "01",
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"00"*11 + "02",
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1,
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"416e79207375626d697373696f6e2074"
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"6f20746865204945544620696e74656e"
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"6465642062792074686520436f6e7472"
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"696275746f7220666f72207075626c69"
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"636174696f6e20617320616c6c206f72"
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"2070617274206f6620616e2049455446"
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"20496e7465726e65742d447261667420"
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"6f722052464320616e6420616e792073"
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"746174656d656e74206d616465207769"
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"7468696e2074686520636f6e74657874"
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"206f6620616e20494554462061637469"
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"7669747920697320636f6e7369646572"
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"656420616e20224945544620436f6e74"
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"7269627574696f6e222e205375636820"
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"73746174656d656e747320696e636c75"
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"6465206f72616c2073746174656d656e"
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"747320696e2049455446207365737369"
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"6f6e732c2061732077656c6c20617320"
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"7772697474656e20616e6420656c6563"
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"74726f6e696320636f6d6d756e696361"
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"74696f6e73206d61646520617420616e"
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"792074696d65206f7220706c6163652c"
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"20776869636820617265206164647265"
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"7373656420746f",
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"a3fbf07df3fa2fde4f376ca23e827370"
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"41605d9f4f4f57bd8cff2c1d4b7955ec"
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"2a97948bd3722915c8f3d337f7d37005"
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"0e9e96d647b7c39f56e031ca5eb6250d"
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"4042e02785ececfa4b4bb5e8ead0440e"
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"20b6e8db09d881a7c6132f420e527950"
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"42bdfa7773d8a9051447b3291ce1411c"
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"680465552aa6c405b7764d5e87bea85a"
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"d00f8449ed8f72d0d662ab052691ca66"
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"424bc86d2df80ea41f43abf937d3259d"
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"c4b2d0dfb48a6c9139ddd7f76966e928"
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"e635553ba76c5c879d7b35d49eb2e62b"
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"0871cdac638939e25e8a1e0ef9d5280f"
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"a8ca328b351c3c765989cbcf3daa8b6c"
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"cc3aaf9f3979c92b3720fc88dc95ed84"
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"a1be059c6499b9fda236e7e818b04b0b"
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"c39c1e876b193bfe5569753f88128cc0"
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"8aaa9b63d1a16f80ef2554d7189c411f"
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"5869ca52c5b83fa36ff216b9c1d30062"
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"bebcfd2dc5bce0911934fda79a86f6e6"
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"98ced759c3ff9b6477338f3da4f9cd85"
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"14ea9982ccafb341b2384dd902f3d1ab"
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"7ac61dd29c6f21ba5b862f3730e37cfd"
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"c4fd806c22f221"
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),
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# Test Vector #3
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(
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"1c9240a5eb55d38af333888604f6b5f0"
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"473917c1402b80099dca5cbc207075c0",
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"00"*11 + "02",
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42,
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"2754776173206272696c6c69672c2061"
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"6e642074686520736c6974687920746f"
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"7665730a446964206779726520616e64"
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"2067696d626c6520696e207468652077"
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"6162653a0a416c6c206d696d73792077"
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"6572652074686520626f726f676f7665"
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"732c0a416e6420746865206d6f6d6520"
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"7261746873206f757467726162652e",
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"62e6347f95ed87a45ffae7426f27a1df"
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"5fb69110044c0d73118effa95b01e5cf"
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"166d3df2d721caf9b21e5fb14c616871"
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"fd84c54f9d65b283196c7fe4f60553eb"
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"f39c6402c42234e32a356b3e764312a6"
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"1a5532055716ead6962568f87d3f3f77"
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"04c6a8d1bcd1bf4d50d6154b6da731b1"
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"87b58dfd728afa36757a797ac188d1"
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)
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]
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for tv in tvs:
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key = unhexlify(tv[0])
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nonce = unhexlify(tv[1])
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offset = tv[2] * 64
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pt = unhexlify(tv[3])
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ct_expect = unhexlify(tv[4])
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cipher = ChaCha20.new(key=key, nonce=nonce)
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if offset != 0:
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cipher.seek(offset)
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ct = cipher.encrypt(pt)
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assert(ct == ct_expect)
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class XChaCha20Test(unittest.TestCase):
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# From https://tools.ietf.org/html/draft-arciszewski-xchacha-03
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def test_hchacha20(self):
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# Section 2.2.1
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from Crypto.Cipher.ChaCha20 import _HChaCha20
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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"
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key = unhexlify(key.replace(b":", b""))
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nonce = b"00:00:00:09:00:00:00:4a:00:00:00:00:31:41:59:27"
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nonce = unhexlify(nonce.replace(b":", b""))
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subkey = _HChaCha20(key, nonce)
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expected = b"82413b42 27b27bfe d30e4250 8a877d73 a0f9e4d5 8a74a853 c12ec413 26d3ecdc"
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expected = unhexlify(expected.replace(b" ", b""))
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self.assertEqual(subkey, expected)
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def test_encrypt(self):
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# Section A.3.2
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pt = b"""
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5468652064686f6c65202870726f6e6f756e6365642022646f6c652229206973
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20616c736f206b6e6f776e2061732074686520417369617469632077696c6420
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646f672c2072656420646f672c20616e642077686973746c696e6720646f672e
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2049742069732061626f7574207468652073697a65206f662061204765726d61
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6e20736865706865726420627574206c6f6f6b73206d6f7265206c696b652061
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206c6f6e672d6c656767656420666f782e205468697320686967686c7920656c
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757369766520616e6420736b696c6c6564206a756d70657220697320636c6173
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736966696564207769746820776f6c7665732c20636f796f7465732c206a6163
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6b616c732c20616e6420666f78657320696e20746865207461786f6e6f6d6963
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2066616d696c792043616e696461652e"""
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pt = unhexlify(pt.replace(b"\n", b"").replace(b" ", b""))
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key = unhexlify(b"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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iv = unhexlify(b"404142434445464748494a4b4c4d4e4f5051525354555658")
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ct = b"""
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7d0a2e6b7f7c65a236542630294e063b7ab9b555a5d5149aa21e4ae1e4fbce87
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ecc8e08a8b5e350abe622b2ffa617b202cfad72032a3037e76ffdcdc4376ee05
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3a190d7e46ca1de04144850381b9cb29f051915386b8a710b8ac4d027b8b050f
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7cba5854e028d564e453b8a968824173fc16488b8970cac828f11ae53cabd201
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12f87107df24ee6183d2274fe4c8b1485534ef2c5fbc1ec24bfc3663efaa08bc
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047d29d25043532db8391a8a3d776bf4372a6955827ccb0cdd4af403a7ce4c63
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d595c75a43e045f0cce1f29c8b93bd65afc5974922f214a40b7c402cdb91ae73
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c0b63615cdad0480680f16515a7ace9d39236464328a37743ffc28f4ddb324f4
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d0f5bbdc270c65b1749a6efff1fbaa09536175ccd29fb9e6057b307320d31683
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8a9c71f70b5b5907a66f7ea49aadc409"""
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ct = unhexlify(ct.replace(b"\n", b"").replace(b" ", b""))
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cipher = ChaCha20.new(key=key, nonce=iv)
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cipher.seek(64) # Counter = 1
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ct_test = cipher.encrypt(pt)
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self.assertEqual(ct, ct_test)
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class ByteArrayTest(unittest.TestCase):
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"""Verify we can encrypt or decrypt bytearrays"""
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def runTest(self):
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data = b"0123"
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key = b"9" * 32
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nonce = b"t" * 8
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# Encryption
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data_ba = bytearray(data)
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key_ba = bytearray(key)
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nonce_ba = bytearray(nonce)
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cipher1 = ChaCha20.new(key=key, nonce=nonce)
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ct = cipher1.encrypt(data)
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cipher2 = ChaCha20.new(key=key_ba, nonce=nonce_ba)
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key_ba[:1] = b'\xFF'
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nonce_ba[:1] = b'\xFF'
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ct_test = cipher2.encrypt(data_ba)
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self.assertEqual(ct, ct_test)
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self.assertEqual(cipher1.nonce, cipher2.nonce)
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# Decryption
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key_ba = bytearray(key)
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nonce_ba = bytearray(nonce)
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ct_ba = bytearray(ct)
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cipher3 = ChaCha20.new(key=key_ba, nonce=nonce_ba)
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key_ba[:1] = b'\xFF'
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nonce_ba[:1] = b'\xFF'
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pt_test = cipher3.decrypt(ct_ba)
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self.assertEqual(data, pt_test)
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class MemoryviewTest(unittest.TestCase):
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"""Verify we can encrypt or decrypt bytearrays"""
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def runTest(self):
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data = b"0123"
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key = b"9" * 32
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nonce = b"t" * 8
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# Encryption
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data_mv = memoryview(bytearray(data))
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key_mv = memoryview(bytearray(key))
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nonce_mv = memoryview(bytearray(nonce))
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cipher1 = ChaCha20.new(key=key, nonce=nonce)
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ct = cipher1.encrypt(data)
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cipher2 = ChaCha20.new(key=key_mv, nonce=nonce_mv)
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key_mv[:1] = b'\xFF'
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nonce_mv[:1] = b'\xFF'
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ct_test = cipher2.encrypt(data_mv)
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self.assertEqual(ct, ct_test)
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self.assertEqual(cipher1.nonce, cipher2.nonce)
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# Decryption
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key_mv = memoryview(bytearray(key))
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nonce_mv = memoryview(bytearray(nonce))
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ct_mv = memoryview(bytearray(ct))
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cipher3 = ChaCha20.new(key=key_mv, nonce=nonce_mv)
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key_mv[:1] = b'\xFF'
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nonce_mv[:1] = b'\xFF'
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pt_test = cipher3.decrypt(ct_mv)
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self.assertEqual(data, pt_test)
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class ChaCha20_AGL_NIR(unittest.TestCase):
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# From http://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04
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# and http://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04
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tv = [
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( "00" * 32,
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"00" * 8,
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"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc"
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"8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11c"
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"c387b669b2ee6586"
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"9f07e7be5551387a98ba977c732d080d"
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"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' * 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 get_tests(config={}):
|
|
tests = []
|
|
tests += list_test_cases(ChaCha20Test)
|
|
tests += list_test_cases(XChaCha20Test)
|
|
tests.append(ChaCha20_AGL_NIR())
|
|
tests.append(ByteArrayTest())
|
|
|
|
import sys
|
|
if sys.version[:3] != "2.6":
|
|
tests.append(MemoryviewTest())
|
|
|
|
tests.append(TestOutput())
|
|
|
|
return tests
|
|
|
|
|
|
if __name__ == '__main__':
|
|
import unittest
|
|
suite = lambda: unittest.TestSuite(get_tests())
|
|
unittest.main(defaultTest='suite')
|