"""

Test suite to check compilance with PEP 247, the standard API

for hashing algorithms

"""

import warnings

warnings.filterwarnings('ignore', 'the md5 module is deprecated.*',

                        DeprecationWarning)

warnings.filterwarnings('ignore', 'the sha module is deprecated.*',

                        DeprecationWarning)

import hmac

import md5

import sha

import unittest

from test import test_support

class Pep247Test(unittest.TestCase):

    def check_module(self, module, key=None):

        self.assert_(hasattr(module, 'digest_size'))

        self.assert_(module.digest_size is None or module.digest_size > 0)

        if not key is None:

            obj1 = module.new(key)

            obj2 = module.new(key, 'string')

            h1 = module.new(key, 'string').digest()

            obj3 = module.new(key)

            obj3.update('string')

            h2 = obj3.digest()

        else:

            obj1 = module.new()

            obj2 = module.new('string')

            h1 = module.new('string').digest()

            obj3 = module.new()

            obj3.update('string')

            h2 = obj3.digest()

        self.assertEquals(h1, h2)

        self.assert_(hasattr(obj1, 'digest_size'))

        if not module.digest_size is None:

            self.assertEquals(obj1.digest_size, module.digest_size)

        self.assertEquals(obj1.digest_size, len(h1))

        obj1.update('string')

        obj_copy = obj1.copy()

        self.assertEquals(obj1.digest(), obj_copy.digest())

        self.assertEquals(obj1.hexdigest(), obj_copy.hexdigest())

        digest, hexdigest = obj1.digest(), obj1.hexdigest()

        hd2 = ""

        for byte in digest:

            hd2 += '%02x' % ord(byte)

        self.assertEquals(hd2, hexdigest)

    def test_md5(self):

        self.check_module(md5)

    def test_sha(self):

        self.check_module(sha)

    def test_hmac(self):

        self.check_module(hmac, key='abc')

def test_main():

    test_support.run_unittest(Pep247Test)

if __name__ == '__main__':

    test_main()