求一个可逆的C#加密解密算法

加密：EncryptDES("要加密的字符串", "azjmerbv"); 解密：DecryptDES("要解密的字符串", "azjmerbv"); //默认密钥向量 private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; ///