Update tlslite to 0.4.6.

third_party/tlslite/tlslite/utils/openssl_tripledes.py

+# Author: Trevor Perrin
+# See the LICENSE file for legal information regarding use of this file.
+
 """OpenSSL/M2Crypto 3DES implementation."""
 
-from cryptomath import *
-from tripledes import *
+from .cryptomath import *
+from .tripledes import *
 
 if m2cryptoLoaded:
 
     def new(key, mode, IV):
         return OpenSSL_TripleDES(key, mode, IV)
 
     class OpenSSL_TripleDES(TripleDES):
 
         def __init__(self, key, mode, IV):
             TripleDES.__init__(self, key, mode, IV, "openssl")
             self.key = key
             self.IV = IV
 
         def _createContext(self, encrypt):
             context = m2.cipher_ctx_new()
             cipherType = m2.des_ede3_cbc()
             m2.cipher_init(context, cipherType, self.key, self.IV, encrypt)
             return context
 
         def encrypt(self, plaintext):
             TripleDES.encrypt(self, plaintext)
             context = self._createContext(1)
             ciphertext = m2.cipher_update(context, plaintext)
             m2.cipher_ctx_free(context)
             self.IV = ciphertext[-self.block_size:]
-            return ciphertext
+            return bytearray(ciphertext)
 
         def decrypt(self, ciphertext):
             TripleDES.decrypt(self, ciphertext)
             context = self._createContext(0)
             #I think M2Crypto has a bug - it fails to decrypt and return the last block passed in.
             #To work around this, we append sixteen zeros to the string, below:
             plaintext = m2.cipher_update(context, ciphertext+('\0'*16))
 
             #If this bug is ever fixed, then plaintext will end up having a garbage
             #plaintext block on the end.  That's okay - the below code will ignore it.
             plaintext = plaintext[:len(ciphertext)]
             m2.cipher_ctx_free(context)
             self.IV = ciphertext[-self.block_size:]
-            return plaintext
+            return bytearray(plaintext)