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"""
Test suite to check compliance with PEP 247, the standard API
for hashing algorithms
"""
import hmac
import unittest
from hashlib import md5, sha1, sha224, sha256, sha384, sha512
class Pep247Test(unittest.TestCase):
def check_module(self, module, key=None):
self.assertTrue(hasattr(module, 'digest_size'))
self.assertTrue(module.digest_size is None or module.digest_size > 0)
self.check_object(module.new, module.digest_size, key)
def check_object(self, cls, digest_size, key, digestmod=None):
if key is not None:
if digestmod is None:
digestmod = md5
obj1 = cls(key, digestmod=digestmod)
obj2 = cls(key, b'string', digestmod=digestmod)
h1 = cls(key, b'string', digestmod=digestmod).digest()
obj3 = cls(key, digestmod=digestmod)
obj3.update(b'string')
h2 = obj3.digest()
else:
obj1 = cls()
obj2 = cls(b'string')
h1 = cls(b'string').digest()
obj3 = cls()
obj3.update(b'string')
h2 = obj3.digest()
self.assertEqual(h1, h2)
self.assertTrue(hasattr(obj1, 'digest_size'))
if digest_size is not None:
self.assertEqual(obj1.digest_size, digest_size)
self.assertEqual(obj1.digest_size, len(h1))
obj1.update(b'string')
obj_copy = obj1.copy()
self.assertEqual(obj1.digest(), obj_copy.digest())
self.assertEqual(obj1.hexdigest(), obj_copy.hexdigest())
digest, hexdigest = obj1.digest(), obj1.hexdigest()
hd2 = ""
for byte in digest:
hd2 += '%02x' % byte
self.assertEqual(hd2, hexdigest)
def test_md5(self):
self.check_object(md5, None, None)
def test_sha(self):
self.check_object(sha1, None, None)
self.check_object(sha224, None, None)
self.check_object(sha256, None, None)
self.check_object(sha384, None, None)
self.check_object(sha512, None, None)
def test_hmac(self):
self.check_module(hmac, key=b'abc')
if __name__ == '__main__':
unittest.main()