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"""Self-test suite for Crypto.Hash.cSHAKE128 and cSHAKE256"""
import unittest
from Crypto.SelfTest.loader import load_test_vectors
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Hash import cSHAKE128, cSHAKE256, SHAKE128, SHAKE256
from Crypto.Util.py3compat import b, bchr, tobytes
class cSHAKETest(unittest.TestCase):
def test_left_encode(self):
from Crypto.Hash.cSHAKE128 import _left_encode
self.assertEqual(_left_encode(0), b'\x01\x00')
self.assertEqual(_left_encode(1), b'\x01\x01')
self.assertEqual(_left_encode(256), b'\x02\x01\x00')
def test_bytepad(self):
from Crypto.Hash.cSHAKE128 import _bytepad
self.assertEqual(_bytepad(b'', 4), b'\x01\x04\x00\x00')
self.assertEqual(_bytepad(b'A', 4), b'\x01\x04A\x00')
self.assertEqual(_bytepad(b'AA', 4), b'\x01\x04AA')
self.assertEqual(_bytepad(b'AAA', 4), b'\x01\x04AAA\x00\x00\x00')
self.assertEqual(_bytepad(b'AAAA', 4), b'\x01\x04AAAA\x00\x00')
self.assertEqual(_bytepad(b'AAAAA', 4), b'\x01\x04AAAAA\x00')
self.assertEqual(_bytepad(b'AAAAAA', 4), b'\x01\x04AAAAAA')
self.assertEqual(_bytepad(b'AAAAAAA', 4), b'\x01\x04AAAAAAA\x00\x00\x00')
def test_new_positive(self):
xof1 = self.cshake.new()
xof2 = self.cshake.new(data=b("90"))
xof3 = self.cshake.new().update(b("90"))
self.assertNotEqual(xof1.read(10), xof2.read(10))
xof3.read(10)
self.assertEqual(xof2.read(10), xof3.read(10))
xof1 = self.cshake.new()
ref = xof1.read(10)
xof2 = self.cshake.new(custom=b(""))
xof3 = self.cshake.new(custom=b("foo"))
self.assertEqual(ref, xof2.read(10))
self.assertNotEqual(ref, xof3.read(10))
xof1 = self.cshake.new(custom=b("foo"))
xof2 = self.cshake.new(custom=b("foo"), data=b("90"))
xof3 = self.cshake.new(custom=b("foo")).update(b("90"))
self.assertNotEqual(xof1.read(10), xof2.read(10))
xof3.read(10)
self.assertEqual(xof2.read(10), xof3.read(10))
def test_update(self):
pieces = [bchr(10) * 200, bchr(20) * 300]
h = self.cshake.new()
h.update(pieces[0]).update(pieces[1])
digest = h.read(10)
h = self.cshake.new()
h.update(pieces[0] + pieces[1])
self.assertEqual(h.read(10), digest)
def test_update_negative(self):
h = self.cshake.new()
self.assertRaises(TypeError, h.update, u"string")
def test_digest(self):
h = self.cshake.new()
digest = h.read(90)
# read returns a byte string of the right length
self.assertTrue(isinstance(digest, type(b("digest"))))
self.assertEqual(len(digest), 90)
def test_update_after_read(self):
mac = self.cshake.new()
mac.update(b("rrrr"))
mac.read(90)
self.assertRaises(TypeError, mac.update, b("ttt"))
def test_shake(self):
# When no customization string is passed, results must match SHAKE
for digest_len in range(64):
xof1 = self.cshake.new(b'TEST')
xof2 = self.shake.new(b'TEST')
self.assertEqual(xof1.read(digest_len), xof2.read(digest_len))
class cSHAKE128Test(cSHAKETest):
cshake = cSHAKE128
shake = SHAKE128
class cSHAKE256Test(cSHAKETest):
cshake = cSHAKE256
shake = SHAKE256
class cSHAKEVectors(unittest.TestCase):
pass
vector_files = [("ShortMsgSamples_cSHAKE128.txt", "Short Message Samples cSHAKE128", "128_cshake", cSHAKE128),
("ShortMsgSamples_cSHAKE256.txt", "Short Message Samples cSHAKE256", "256_cshake", cSHAKE256),
("CustomMsgSamples_cSHAKE128.txt", "Custom Message Samples cSHAKE128", "custom_128_cshake", cSHAKE128),
("CustomMsgSamples_cSHAKE256.txt", "Custom Message Samples cSHAKE256", "custom_256_cshake", cSHAKE256),
]
for file, descr, tag, test_class in vector_files:
test_vectors = load_test_vectors(("Hash", "SHA3"), file, descr,
{"len": lambda x: int(x),
"nlen": lambda x: int(x),
"slen": lambda x: int(x)}) or []
for idx, tv in enumerate(test_vectors):
if getattr(tv, "len", 0) == 0:
data = b("")
else:
data = tobytes(tv.msg)
assert(tv.len == len(tv.msg)*8)
if getattr(tv, "nlen", 0) != 0:
raise ValueError("Unsupported cSHAKE test vector")
if getattr(tv, "slen", 0) == 0:
custom = b("")
else:
custom = tobytes(tv.s)
assert(tv.slen == len(tv.s)*8)
def new_test(self, data=data, result=tv.md, custom=custom, test_class=test_class):
hobj = test_class.new(data=data, custom=custom)
digest = hobj.read(len(result))
self.assertEqual(digest, result)
setattr(cSHAKEVectors, "test_%s_%d" % (tag, idx), new_test)
def get_tests(config={}):
tests = []
tests += list_test_cases(cSHAKE128Test)
tests += list_test_cases(cSHAKE256Test)
tests += list_test_cases(cSHAKEVectors)
return tests
if __name__ == '__main__':
import unittest
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')