text: # Copyright (c) 2002-2012 IronPort Systems and Cisco Systems
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # 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.
  
  #
  # ssh_hmac_md5
  #
  # Implements the hmac-md5 SSH MAC algorithm.
  
  from hmac import SSH_HMAC
  import hashlib
  
  class HMAC_MD5(SSH_HMAC):
  
      name = 'hmac-md5'
      block_size = 64
      digest_size = 16
      key_size = 16
  
      def get_hash_object(self):
          return hashlib.md5()
  
  import unittest
  
  class ssh_hmac_md5_test_case(unittest.TestCase):
      pass
  
  class hmac_md5_test_case(ssh_hmac_md5_test_case):
  
      def runTest(self):
          # From RFC2104
          a = HMAC_MD5()
          a.set_key('\x0b' * 16)
          self.assertEqual(a.hmac('Hi There'), '\x92\x94\x72\x7a\x36\x38\xbb\x1c\x13\xf4\x8e\xf8\x15\x8b\xfc\x9d')
  
          a = HMAC_MD5()
          a.set_key('Jefe' + '\0' * 12)
          self.assertEqual(a.hmac('what do ya want for nothing?'),
                           '\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38')
  
          a = HMAC_MD5()
          a.set_key('\xAA' * 16)
          self.assertEqual(a.hmac('\xDD' * 50), '\x56\xbe\x34\x52\x1d\x14\x4c\x88\xdb\xb8\xc7\x33\xf0\xe8\xb3\xf6')
  
  def suite():
      suite = unittest.TestSuite()
      suite.addTest(hmac_md5_test_case())
      return suite
  
  if __name__ == '__main__':
      unittest.main(defaultTest='suite')
  