text: # -*- coding: utf-8 -*-
  
  import unittest
  
  from ...ratchet.chainkey import ChainKey
  from ...kdf.hkdf import HKDF
  
  
  class ChainKeyTest(unittest.TestCase):
      def test_chainKeyDerivationV2(self):
          seed = bytearray([0x8a, 0xb7, 0x2d, 0x6f, 0x4c, 0xc5, 0xac, 0x0d, 0x38, 0x7e, 0xaf, 0x46, 0x33, 0x78, 0xdd,
                            0xb2, 0x8e, 0xdd, 0x07, 0x38, 0x5b, 0x1c, 0xb0, 0x12, 0x50, 0xc7, 0x15, 0x98, 0x2e, 0x7a,
                            0xd4, 0x8f])
  
          messageKey = bytearray([0x02, 0xa9, 0xaa, 0x6c, 0x7d, 0xbd, 0x64, 0xf9, 0xd3, 0xaa, 0x92, 0xf9, 0x2a, 0x27,
                                  0x7b, 0xf5, 0x46, 0x09, 0xda, 0xdf, 0x0b, 0x00, 0x82, 0x8a, 0xcf, 0xc6, 0x1e, 0x3c,
                                  0x72, 0x4b, 0x84, 0xa7])
  
          macKey = bytearray([0xbf, 0xbe, 0x5e, 0xfb, 0x60, 0x30, 0x30, 0x52, 0x67, 0x42, 0xe3, 0xee, 0x89, 0xc7,
                              0x02, 0x4e, 0x88, 0x4e, 0x44, 0x0f, 0x1f, 0xf3, 0x76, 0xbb, 0x23, 0x17, 0xb2, 0xd6,
                              0x4d, 0xeb, 0x7c, 0x83])
  
          nextChainKey = bytearray([0x28, 0xe8, 0xf8, 0xfe, 0xe5, 0x4b, 0x80, 0x1e, 0xef, 0x7c, 0x5c, 0xfb, 0x2f,
                                    0x17, 0xf3, 0x2c, 0x7b, 0x33, 0x44, 0x85, 0xbb, 0xb7, 0x0f, 0xac, 0x6e, 0xc1,
                                    0x03, 0x42, 0xa2, 0x46, 0xd1, 0x5d])
  
          chainKey = ChainKey(HKDF.createFor(2), seed, 0)
          self.assertEqual(chainKey.getKey(), seed)
          self.assertEqual(chainKey.getMessageKeys().getCipherKey(), messageKey)
          self.assertEqual(chainKey.getMessageKeys().getMacKey(), macKey)
          self.assertEqual(chainKey.getNextChainKey().getKey(), nextChainKey)
          self.assertEqual(chainKey.getIndex(), 0)
          self.assertEqual(chainKey.getMessageKeys().getCounter(), 0)
          self.assertEqual(chainKey.getNextChainKey().getIndex(), 1)
          self.assertEqual(chainKey.getNextChainKey().getMessageKeys().getCounter(), 1)
  