329 lines
11 KiB
Python
329 lines
11 KiB
Python
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# -*- coding: utf-8 -*-
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#
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# SelfTest/Hash/common.py: Common code for Crypto.SelfTest.Hash
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#
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# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
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#
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# ===================================================================
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# The contents of this file are dedicated to the public domain. To
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# the extent that dedication to the public domain is not available,
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# everyone is granted a worldwide, perpetual, royalty-free,
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# non-exclusive license to exercise all rights associated with the
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# contents of this file for any purpose whatsoever.
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# No rights are reserved.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# ===================================================================
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"""Self-testing for PyCrypto hash modules"""
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import unittest
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from binascii import a2b_hex, b2a_hex, hexlify
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from Crypto.Util.py3compat import *
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from Crypto.Util.strxor import strxor_c
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class _NoDefault: pass # sentinel object
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def _extract(d, k, default=_NoDefault):
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"""Get an item from a dictionary, and remove it from the dictionary."""
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try:
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retval = d[k]
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except KeyError:
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if default is _NoDefault:
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raise
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return default
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del d[k]
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return retval
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# Generic cipher test case
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class CipherSelfTest(unittest.TestCase):
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def __init__(self, module, params):
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unittest.TestCase.__init__(self)
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self.module = module
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# Extract the parameters
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params = params.copy()
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self.description = _extract(params, 'description')
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self.key = b(_extract(params, 'key'))
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self.plaintext = b(_extract(params, 'plaintext'))
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self.ciphertext = b(_extract(params, 'ciphertext'))
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self.module_name = _extract(params, 'module_name', None)
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self.assoc_data = _extract(params, 'assoc_data', None)
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self.mac = _extract(params, 'mac', None)
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if self.assoc_data:
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self.mac = b(self.mac)
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mode = _extract(params, 'mode', None)
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self.mode_name = str(mode)
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if mode is not None:
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# Block cipher
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self.mode = getattr(self.module, "MODE_" + mode)
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self.iv = _extract(params, 'iv', None)
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if self.iv is None:
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self.iv = _extract(params, 'nonce', None)
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if self.iv is not None:
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self.iv = b(self.iv)
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else:
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# Stream cipher
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self.mode = None
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self.iv = _extract(params, 'iv', None)
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if self.iv is not None:
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self.iv = b(self.iv)
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self.extra_params = params
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def shortDescription(self):
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return self.description
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def _new(self, do_decryption=0):
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params = self.extra_params.copy()
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if self.mode is None:
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if self.iv is None:
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return self.module.new(a2b_hex(self.key), **params)
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else:
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return self.module.new(a2b_hex(self.key), a2b_hex(self.iv), **params)
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elif self.iv is None:
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# Block cipher without iv
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return self.module.new(a2b_hex(self.key), self.mode, **params)
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else:
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return self.module.new(a2b_hex(self.key), self.mode, a2b_hex(self.iv), **params)
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def isMode(self, name):
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if not hasattr(self.module, "MODE_"+name):
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return False
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return self.mode == getattr(self.module, "MODE_"+name)
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def runTest(self):
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plaintext = a2b_hex(self.plaintext)
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ciphertext = a2b_hex(self.ciphertext)
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assoc_data = []
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if self.assoc_data:
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assoc_data = [ a2b_hex(b(x)) for x in self.assoc_data]
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ct = None
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pt = None
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#
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# Repeat the same encryption or decryption twice and verify
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# that the result is always the same
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#
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for i in range(2):
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cipher = self._new()
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decipher = self._new(1)
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# Only AEAD modes
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for comp in assoc_data:
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cipher.update(comp)
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decipher.update(comp)
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ctX = b2a_hex(cipher.encrypt(plaintext))
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ptX = b2a_hex(decipher.decrypt(ciphertext))
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if ct:
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self.assertEqual(ct, ctX)
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self.assertEqual(pt, ptX)
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ct, pt = ctX, ptX
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self.assertEqual(self.ciphertext, ct) # encrypt
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self.assertEqual(self.plaintext, pt) # decrypt
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if self.mac:
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mac = b2a_hex(cipher.digest())
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self.assertEqual(self.mac, mac)
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decipher.verify(a2b_hex(self.mac))
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class CipherStreamingSelfTest(CipherSelfTest):
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def shortDescription(self):
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desc = self.module_name
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if self.mode is not None:
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desc += " in %s mode" % (self.mode_name,)
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return "%s should behave like a stream cipher" % (desc,)
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def runTest(self):
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plaintext = a2b_hex(self.plaintext)
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ciphertext = a2b_hex(self.ciphertext)
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# The cipher should work like a stream cipher
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# Test counter mode encryption, 3 bytes at a time
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ct3 = []
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cipher = self._new()
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for i in range(0, len(plaintext), 3):
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ct3.append(cipher.encrypt(plaintext[i:i+3]))
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ct3 = b2a_hex(b("").join(ct3))
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self.assertEqual(self.ciphertext, ct3) # encryption (3 bytes at a time)
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# Test counter mode decryption, 3 bytes at a time
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pt3 = []
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cipher = self._new()
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for i in range(0, len(ciphertext), 3):
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pt3.append(cipher.encrypt(ciphertext[i:i+3]))
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# PY3K: This is meant to be text, do not change to bytes (data)
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pt3 = b2a_hex(b("").join(pt3))
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self.assertEqual(self.plaintext, pt3) # decryption (3 bytes at a time)
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class RoundtripTest(unittest.TestCase):
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def __init__(self, module, params):
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from Crypto import Random
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unittest.TestCase.__init__(self)
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self.module = module
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self.iv = Random.get_random_bytes(module.block_size)
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self.key = b(params['key'])
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self.plaintext = 100 * b(params['plaintext'])
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self.module_name = params.get('module_name', None)
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def shortDescription(self):
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return """%s .decrypt() output of .encrypt() should not be garbled""" % (self.module_name,)
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def runTest(self):
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## ECB mode
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mode = self.module.MODE_ECB
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encryption_cipher = self.module.new(a2b_hex(self.key), mode)
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ciphertext = encryption_cipher.encrypt(self.plaintext)
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decryption_cipher = self.module.new(a2b_hex(self.key), mode)
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decrypted_plaintext = decryption_cipher.decrypt(ciphertext)
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self.assertEqual(self.plaintext, decrypted_plaintext)
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class IVLengthTest(unittest.TestCase):
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def __init__(self, module, params):
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unittest.TestCase.__init__(self)
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self.module = module
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self.key = b(params['key'])
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def shortDescription(self):
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return "Check that all modes except MODE_ECB and MODE_CTR require an IV of the proper length"
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def runTest(self):
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self.assertRaises(TypeError, self.module.new, a2b_hex(self.key),
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self.module.MODE_ECB, b(""))
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def _dummy_counter(self):
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return "\0" * self.module.block_size
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class NoDefaultECBTest(unittest.TestCase):
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def __init__(self, module, params):
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unittest.TestCase.__init__(self)
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self.module = module
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self.key = b(params['key'])
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def runTest(self):
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self.assertRaises(TypeError, self.module.new, a2b_hex(self.key))
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def make_block_tests(module, module_name, test_data, additional_params=dict()):
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tests = []
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extra_tests_added = 0
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for i in range(len(test_data)):
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row = test_data[i]
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# Build the "params" dictionary with
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# - plaintext
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# - ciphertext
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# - key
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# - mode (default is ECB)
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# - (optionally) description
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# - (optionally) any other parameter that this cipher mode requires
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params = {}
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if len(row) == 3:
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(params['plaintext'], params['ciphertext'], params['key']) = row
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elif len(row) == 4:
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(params['plaintext'], params['ciphertext'], params['key'], params['description']) = row
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elif len(row) == 5:
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(params['plaintext'], params['ciphertext'], params['key'], params['description'], extra_params) = row
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params.update(extra_params)
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else:
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raise AssertionError("Unsupported tuple size %d" % (len(row),))
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if "mode" not in params:
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params["mode"] = "ECB"
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# Build the display-name for the test
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p2 = params.copy()
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p_key = _extract(p2, 'key')
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p_plaintext = _extract(p2, 'plaintext')
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p_ciphertext = _extract(p2, 'ciphertext')
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p_mode = _extract(p2, 'mode')
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p_description = _extract(p2, 'description', None)
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if p_description is not None:
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description = p_description
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elif p_mode == 'ECB' and not p2:
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description = "p=%s, k=%s" % (p_plaintext, p_key)
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else:
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description = "p=%s, k=%s, %r" % (p_plaintext, p_key, p2)
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name = "%s #%d: %s" % (module_name, i+1, description)
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params['description'] = name
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params['module_name'] = module_name
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params.update(additional_params)
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# Add extra test(s) to the test suite before the current test
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if not extra_tests_added:
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tests += [
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RoundtripTest(module, params),
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IVLengthTest(module, params),
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NoDefaultECBTest(module, params),
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]
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extra_tests_added = 1
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# Add the current test to the test suite
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tests.append(CipherSelfTest(module, params))
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return tests
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def make_stream_tests(module, module_name, test_data):
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tests = []
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for i in range(len(test_data)):
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row = test_data[i]
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# Build the "params" dictionary
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params = {}
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if len(row) == 3:
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(params['plaintext'], params['ciphertext'], params['key']) = row
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elif len(row) == 4:
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(params['plaintext'], params['ciphertext'], params['key'], params['description']) = row
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elif len(row) == 5:
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(params['plaintext'], params['ciphertext'], params['key'], params['description'], extra_params) = row
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params.update(extra_params)
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else:
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raise AssertionError("Unsupported tuple size %d" % (len(row),))
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# Build the display-name for the test
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p2 = params.copy()
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p_key = _extract(p2, 'key')
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p_plaintext = _extract(p2, 'plaintext')
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p_ciphertext = _extract(p2, 'ciphertext')
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p_description = _extract(p2, 'description', None)
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if p_description is not None:
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description = p_description
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elif not p2:
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description = "p=%s, k=%s" % (p_plaintext, p_key)
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else:
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description = "p=%s, k=%s, %r" % (p_plaintext, p_key, p2)
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name = "%s #%d: %s" % (module_name, i+1, description)
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params['description'] = name
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params['module_name'] = module_name
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# Add the test to the test suite
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tests.append(CipherSelfTest(module, params))
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tests.append(CipherStreamingSelfTest(module, params))
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return tests
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# vim:set ts=4 sw=4 sts=4 expandtab:
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