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#
# Test suite to check compliance with PEP 247, the standard API for
# hashing algorithms.
#
import hmac
def check_hash_module(module, key=None):
assert hasattr(module, 'digest_size'), "Must have digest_size"
assert (module.digest_size is None or
module.digest_size > 0), "digest_size must be None or positive"
if key is not None:
obj1 = module.new(key)
obj2 = module.new(key, b"string")
h1 = module.new(key, b"string").digest()
obj3 = module.new(key) ; obj3.update(b"string") ; h2 = obj3.digest()
assert h1 == h2, "Hashes must match"
else:
obj1 = module.new()
obj2 = module.new(b"string")
h1 = module.new(b"string").digest()
obj3 = module.new() ; obj3.update(b"string") ; h2 = obj3.digest()
assert h1 == h2, "Hashes must match"
assert hasattr(obj1, 'digest_size'), "Objects must have digest_size attr"
if module.digest_size is not None:
assert obj1.digest_size == module.digest_size, "digest_size must match"
assert obj1.digest_size == len(h1), "digest_size must match actual size"
obj1.update(b"string")
obj_copy = obj1.copy()
assert obj1.digest() == obj_copy.digest(), "Copied objects must match"
assert obj1.hexdigest() == obj_copy.hexdigest(), \
"Copied objects must match"
digest, hexdigest = obj1.digest(), obj1.hexdigest()
hd2 = ""
for byte in digest:
hd2 += "%02x" % byte
assert hd2 == hexdigest, "hexdigest doesn't appear correct"
print('Module', module.__name__, 'seems to comply with PEP 247')
if __name__ == '__main__':
check_hash_module(hmac, key=b'abc')
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