Python cryptography.hazmat.primitives.ciphers.algorithms 模块，ARC4 实例源码

def __init__(self):
        """
        Construct a CryptographyEngine.
        """
        self.logger = logging.getLogger('kmip.server.engine.cryptography')

        self._symmetric_key_algorithms = {
            enums.CryptographicAlgorithm.TRIPLE_DES: algorithms.TripleDES,
            enums.CryptographicAlgorithm.AES: algorithms.AES,
            enums.CryptographicAlgorithm.BLOWFISH: algorithms.Blowfish,
            enums.CryptographicAlgorithm.CAMELLIA: algorithms.Camellia,
            enums.CryptographicAlgorithm.CAST5: algorithms.CAST5,
            enums.CryptographicAlgorithm.IDEA: algorithms.IDEA,
            enums.CryptographicAlgorithm.RC4: algorithms.ARC4
        }
        self._asymetric_key_algorithms = {
            enums.CryptographicAlgorithm.RSA: self._create_rsa_key_pair
        }
        self._hash_algorithms = {
            enums.CryptographicAlgorithm.HMAC_SHA1: hashes.SHA1,
            enums.CryptographicAlgorithm.HMAC_SHA224: hashes.SHA224,
            enums.CryptographicAlgorithm.HMAC_SHA256: hashes.SHA256,
            enums.CryptographicAlgorithm.HMAC_SHA384: hashes.SHA384,
            enums.CryptographicAlgorithm.HMAC_SHA512: hashes.SHA512,
            enums.CryptographicAlgorithm.HMAC_MD5: hashes.MD5
        }