Update tlslite to 0.4.6.

third_party/tlslite/tlslite/utils/OpenSSL_AES.py

-"""OpenSSL/M2Crypto AES implementation."""
-
-from cryptomath import *
-from AES import *
-
-if m2cryptoLoaded:
-
-    def new(key, mode, IV):
-        return OpenSSL_AES(key, mode, IV)
-
-    class OpenSSL_AES(AES):
-
-        def __init__(self, key, mode, IV):
-            AES.__init__(self, key, mode, IV, "openssl")
-            self.key = key
-            self.IV = IV
-
-        def _createContext(self, encrypt):
-            context = m2.cipher_ctx_new()
-            if len(self.key)==16:
-                cipherType = m2.aes_128_cbc()
-            if len(self.key)==24:
-                cipherType = m2.aes_192_cbc()
-            if len(self.key)==32:
-                cipherType = m2.aes_256_cbc()
-            m2.cipher_init(context, cipherType, self.key, self.IV, encrypt)
-            return context
-
-        def encrypt(self, plaintext):
-            AES.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
-
-        def decrypt(self, ciphertext):
-            AES.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 discard it.
-            plaintext = plaintext[:len(ciphertext)]
-            m2.cipher_ctx_free(context)
-            self.IV = ciphertext[-self.block_size:]
-            return plaintext