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