def createTripleDES(key, IV, implList=None): """Create a new 3DES object. @type key: str @param key: A 24 byte string. @type IV: str @param IV: An 8 byte string @rtype: L{tlslite.utils.TripleDES} @return: A 3DES object. """ if implList is None: implList = ["openssl", "pycrypto"] for impl in implList: if impl == "openssl" and cryptomath.m2cryptoLoaded: return openssl_tripledes.new(key, 2, IV) elif impl == "pycrypto" and cryptomath.pycryptoLoaded: return pycrypto_tripledes.new(key, 2, IV) raise NotImplementedError()