400 lines
17 KiB
Python
400 lines
17 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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__revision__ = "$Id$"
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import sys
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import unittest
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from binascii import a2b_hex, b2a_hex
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from Crypto.Util.py3compat import *
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# For compatibility with Python 2.1 and Python 2.2
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if sys.hexversion < 0x02030000:
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# Python 2.1 doesn't have a dict() function
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# Python 2.2 dict() function raises TypeError if you do dict(MD5='blah')
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def dict(**kwargs):
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return kwargs.copy()
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else:
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dict = dict
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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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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 not None: self.iv = b(self.iv)
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# Only relevant for OPENPGP mode
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self.encrypted_iv = _extract(params, 'encrypted_iv', None)
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if self.encrypted_iv is not None:
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self.encrypted_iv = b(self.encrypted_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 = None
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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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# Handle CTR mode parameters. By default, we use Counter.new(self.module.block_size)
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if hasattr(self.module, "MODE_CTR") and self.mode == self.module.MODE_CTR:
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from Crypto.Util import Counter
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ctr_class = _extract(params, 'ctr_class', Counter.new)
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ctr_params = _extract(params, 'ctr_params', {}).copy()
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if 'prefix' in ctr_params: ctr_params['prefix'] = a2b_hex(b(ctr_params['prefix']))
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if 'suffix' in ctr_params: ctr_params['suffix'] = a2b_hex(b(ctr_params['suffix']))
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if 'nbits' not in ctr_params:
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ctr_params['nbits'] = 8*(self.module.block_size - len(ctr_params.get('prefix', '')) - len(ctr_params.get('suffix', '')))
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params['counter'] = ctr_class(**ctr_params)
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if self.mode is None:
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# Stream cipher
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return self.module.new(a2b_hex(self.key), **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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# Block cipher with iv
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if do_decryption and self.mode == self.module.MODE_OPENPGP:
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# In PGP mode, the IV to feed for decryption is the *encrypted* one
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return self.module.new(a2b_hex(self.key), self.mode, a2b_hex(self.encrypted_iv), **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 runTest(self):
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plaintext = a2b_hex(self.plaintext)
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ciphertext = a2b_hex(self.ciphertext)
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ct1 = b2a_hex(self._new().encrypt(plaintext))
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pt1 = b2a_hex(self._new(1).decrypt(ciphertext))
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ct2 = b2a_hex(self._new().encrypt(plaintext))
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pt2 = b2a_hex(self._new(1).decrypt(ciphertext))
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if hasattr(self.module, "MODE_OPENPGP") and self.mode == self.module.MODE_OPENPGP:
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# In PGP mode, data returned by the first encrypt()
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# is prefixed with the encrypted IV.
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# Here we check it and then remove it from the ciphertexts.
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eilen = len(self.encrypted_iv)
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self.assertEqual(self.encrypted_iv, ct1[:eilen])
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self.assertEqual(self.encrypted_iv, ct2[:eilen])
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ct1 = ct1[eilen:]
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ct2 = ct2[eilen:]
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self.assertEqual(self.ciphertext, ct1) # encrypt
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self.assertEqual(self.ciphertext, ct2) # encrypt (second time)
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self.assertEqual(self.plaintext, pt1) # decrypt
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self.assertEqual(self.plaintext, pt2) # decrypt (second time)
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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 CTRSegfaultTest(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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self.module_name = params.get('module_name', None)
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def shortDescription(self):
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return """Regression test: %s.new(key, %s.MODE_CTR) should raise TypeError, not segfault""" % (self.module_name, self.module_name)
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def runTest(self):
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self.assertRaises(TypeError, self.module.new, a2b_hex(self.key), self.module.MODE_CTR)
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class CTRWraparoundTest(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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self.module_name = params.get('module_name', None)
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def shortDescription(self):
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return """Regression test: %s with MODE_CTR should raise OverflowError on wraparound when shortcut used""" % (self.module_name,)
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def runTest(self):
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from Crypto.Util import Counter
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for disable_shortcut in (0, 1): # (False, True) Test CTR-mode shortcut and PyObject_CallObject code paths
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for little_endian in (0, 1): # (False, True) Test both endiannesses
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ctr = Counter.new(8*self.module.block_size, initial_value=2**(8*self.module.block_size)-1, little_endian=little_endian, disable_shortcut=disable_shortcut)
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cipher = self.module.new(a2b_hex(self.key), self.module.MODE_CTR, counter=ctr)
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block = b("\x00") * self.module.block_size
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cipher.encrypt(block)
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self.assertRaises(OverflowError, cipher.encrypt, block)
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class CFBSegmentSizeTest(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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self.description = params['description']
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def shortDescription(self):
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return self.description
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def runTest(self):
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"""Regression test: m.new(key, m.MODE_CFB, segment_size=N) should require segment_size to be a multiple of 8 bits"""
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for i in range(1, 8):
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self.assertRaises(ValueError, self.module.new, a2b_hex(self.key), self.module.MODE_CFB, segment_size=i)
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self.module.new(a2b_hex(self.key), self.module.MODE_CFB, "\0"*self.module.block_size, segment_size=8) # should succeed
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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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for mode in (self.module.MODE_ECB, self.module.MODE_CBC, self.module.MODE_CFB, self.module.MODE_OFB, self.module.MODE_OPENPGP):
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encryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
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ciphertext = encryption_cipher.encrypt(self.plaintext)
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if mode != self.module.MODE_OPENPGP:
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decryption_cipher = self.module.new(a2b_hex(self.key), mode, self.iv)
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else:
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eiv = ciphertext[:self.module.block_size+2]
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ciphertext = ciphertext[self.module.block_size+2:]
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decryption_cipher = self.module.new(a2b_hex(self.key), mode, eiv)
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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 PGPTest(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 "MODE_PGP was implemented incorrectly and insecurely. It's completely banished now."
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def runTest(self):
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self.assertRaises(ValueError, self.module.new, a2b_hex(self.key),
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self.module.MODE_PGP)
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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(ValueError, self.module.new, a2b_hex(self.key),
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self.module.MODE_CBC, "")
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self.assertRaises(ValueError, self.module.new, a2b_hex(self.key),
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self.module.MODE_CFB, "")
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self.assertRaises(ValueError, self.module.new, a2b_hex(self.key),
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self.module.MODE_OFB, "")
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self.assertRaises(ValueError, self.module.new, a2b_hex(self.key),
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self.module.MODE_OPENPGP, "")
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self.module.new(a2b_hex(self.key), self.module.MODE_ECB, "")
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self.module.new(a2b_hex(self.key), self.module.MODE_CTR, "", counter=self._dummy_counter)
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def _dummy_counter(self):
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return "\0" * self.module.block_size
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def make_block_tests(module, module_name, test_data):
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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
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params = {'mode': 'ECB'}
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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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p_mode = p2.get('mode', 'ECB')
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if p_mode == 'ECB':
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_extract(p2, 'mode', 'ECB')
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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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# 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 += [
|
||
|
|
CTRSegfaultTest(module, params),
|
||
|
|
CTRWraparoundTest(module, params),
|
||
|
|
CFBSegmentSizeTest(module, params),
|
||
|
|
RoundtripTest(module, params),
|
||
|
|
PGPTest(module, params),
|
||
|
|
IVLengthTest(module, params),
|
||
|
|
]
|
||
|
|
extra_tests_added = 1
|
||
|
|
|
||
|
|
# Add the current test to the test suite
|
||
|
|
tests.append(CipherSelfTest(module, params))
|
||
|
|
|
||
|
|
# When using CTR mode, test that the interface behaves like a stream cipher
|
||
|
|
if p_mode == 'CTR':
|
||
|
|
tests.append(CipherStreamingSelfTest(module, params))
|
||
|
|
|
||
|
|
# When using CTR mode, test the non-shortcut code path.
|
||
|
|
if p_mode == 'CTR' and 'ctr_class' not in params:
|
||
|
|
params2 = params.copy()
|
||
|
|
params2['description'] += " (shortcut disabled)"
|
||
|
|
ctr_params2 = params.get('ctr_params', {}).copy()
|
||
|
|
params2['ctr_params'] = ctr_params2
|
||
|
|
if 'disable_shortcut' not in params2['ctr_params']:
|
||
|
|
params2['ctr_params']['disable_shortcut'] = 1
|
||
|
|
tests.append(CipherSelfTest(module, params2))
|
||
|
|
return tests
|
||
|
|
|
||
|
|
def make_stream_tests(module, module_name, test_data):
|
||
|
|
tests = []
|
||
|
|
for i in range(len(test_data)):
|
||
|
|
row = test_data[i]
|
||
|
|
|
||
|
|
# Build the "params" dictionary
|
||
|
|
params = {}
|
||
|
|
if len(row) == 3:
|
||
|
|
(params['plaintext'], params['ciphertext'], params['key']) = row
|
||
|
|
elif len(row) == 4:
|
||
|
|
(params['plaintext'], params['ciphertext'], params['key'], params['description']) = row
|
||
|
|
elif len(row) == 5:
|
||
|
|
(params['plaintext'], params['ciphertext'], params['key'], params['description'], extra_params) = row
|
||
|
|
params.update(extra_params)
|
||
|
|
else:
|
||
|
|
raise AssertionError("Unsupported tuple size %d" % (len(row),))
|
||
|
|
|
||
|
|
# Build the display-name for the test
|
||
|
|
p2 = params.copy()
|
||
|
|
p_key = _extract(p2, 'key')
|
||
|
|
p_plaintext = _extract(p2, 'plaintext')
|
||
|
|
p_ciphertext = _extract(p2, 'ciphertext')
|
||
|
|
p_description = _extract(p2, 'description', None)
|
||
|
|
|
||
|
|
if p_description is not None:
|
||
|
|
description = p_description
|
||
|
|
elif not p2:
|
||
|
|
description = "p=%s, k=%s" % (p_plaintext, p_key)
|
||
|
|
else:
|
||
|
|
description = "p=%s, k=%s, %r" % (p_plaintext, p_key, p2)
|
||
|
|
name = "%s #%d: %s" % (module_name, i+1, description)
|
||
|
|
params['description'] = name
|
||
|
|
params['module_name'] = module_name
|
||
|
|
|
||
|
|
# Add the test to the test suite
|
||
|
|
tests.append(CipherSelfTest(module, params))
|
||
|
|
tests.append(CipherStreamingSelfTest(module, params))
|
||
|
|
return tests
|
||
|
|
|
||
|
|
# vim:set ts=4 sw=4 sts=4 expandtab:
|