Build a cryptography TripleDES Cipher object.

    :param bytes key: Encryption key
    :param bytesiv iv: Initialization vector
    :returns: TripleDES Cipher instance
    :rtype: cryptography.hazmat.primitives.ciphers.Cipher

def _cryptography_cipher(key, iv):
    """Build a cryptography TripleDES Cipher object.

    :param bytes key: Encryption key
    :param bytesiv iv: Initialization vector
    :returns: TripleDES Cipher instance
    :rtype: cryptography.hazmat.primitives.ciphers.Cipher
    """
    return Cipher(
        algorithm=algorithms.TripleDES(key),
        mode=modes.CBC(iv),
        backend=default_backend()
    )