C# 加密解密以及sha256不可逆加密案例

 class Program
    {
        static void Main(string[] args)
        {
            string aa = "身份证";
            string bb = "key";
            string cc = Encrypt(aa, bb);
            string dd = Decrypt("xFMIXBr82tTfDLmjbOoGuQWDeNS/jJUCv/p8mMxH/V4=", "key");
            string ee = DateTime.Parse("2018-11-28 18:58:55.327").ToString("yyyyMMddHHmmssff");
            Console.WriteLine(aa);
            Console.WriteLine(bb);
            Console.WriteLine(cc);
            Console.WriteLine(dd);
            Console.WriteLine(ee);

            string AA = sha256("要加密的数字");
            Console.WriteLine(AA);

            Console.ReadKey();
        }

        /// <summary>
        /// sha256加密
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string sha256(string data)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(data);
            byte[] hash = SHA256Managed.Create().ComputeHash(bytes);

            StringBuilder builder = new StringBuilder();
            for (int i = ; i < hash.Length; i++)
            {
                builder.Append(hash[i].ToString("X2"));
            }

            return builder.ToString();
        }

        public static string Encrypt(string encryptStr, string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(encryptStr);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB; //加密模式
            rDel.Padding = PaddingMode.PKCS7;   //填充模式
            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, , resultArray.Length);
        }
        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="decryptStr">密文</param>
        /// <param name="key">密钥</param>
        /// <returns></returns>
        public static string Decrypt(string decryptStr, string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = Convert.FromBase64String(decryptStr);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return UTF8Encoding.UTF8.GetString(resultArray);
        }
    }