C# 3DES 加密

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    public class DESHelper    {        #region 3des加密        /// <summary>        /// 3des ecb模式加密        /// </summary>        /// <param name="aStrString">待加密的字符串</param>        /// <param name="aStrKey">密钥</param>        /// <param name="iv">加密矢量：只有在CBC解密模式下才适用</param>        /// <param name="mode">运算模式</param>        /// <returns>加密后的字符串</returns>        public static string Encrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")        {            try            {                var des = new TripleDESCryptoServiceProvider                {                    Key = Encoding.UTF8.GetBytes(aStrKey),                    Mode = mode                };                if (mode == CipherMode.CBC)                {                    des.IV = Encoding.UTF8.GetBytes(iv);                }                var desEncrypt = des.CreateEncryptor();                byte[] buffer = Encoding.UTF8.GetBytes(aStrString);                buffer = Encoding.Convert(Encoding.GetEncoding("UTF-8"), Encoding.GetEncoding("GB2312"), buffer);                return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));            }            catch (Exception e)            {                return string.Empty;            }        }        #endregion        #region 3des解密        /// <summary>        /// des 解密        /// </summary>        /// <param name="aStrString">加密的字符串</param>        /// <param name="aStrKey">密钥</param>        /// <param name="iv">解密矢量：只有在CBC解密模式下才适用</param>        /// <param name="mode">运算模式</param>        /// <returns>解密的字符串</returns>        public static string Decrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")        {            try            {                var des = new TripleDESCryptoServiceProvider                {                    Key = Encoding.UTF8.GetBytes(aStrKey),                    Mode = mode,                    Padding = PaddingMode.PKCS7                };                if (mode == CipherMode.CBC)                {                    des.IV = Encoding.UTF8.GetBytes(iv);                }                var desDecrypt = des.CreateDecryptor();                var result = "";                byte[] buffer = Convert.FromBase64String(aStrString);                result = Encoding.UTF8.GetString(desDecrypt.TransformFinalBlock(buffer, 0, buffer.Length));                return result;            }            catch (Exception e)            {                return string.Empty;            }        }        #endregion    }

测试：注意key字符长度为24

        static void Main(string[] args)        {            //IV            string IV = "20160120";            //KEY            string KEY = "012345678901234567891234";            //data json string            string dataJsonString = "TEST";            Console.WriteLine("加密之前："+ dataJsonString);            //3des 加密            string Encrypt3Des = DESHelper.Encrypt3Des(dataJsonString, KEY, CipherMode.CBC, IV);            Console.WriteLine("加密之后：" + Encrypt3Des);            //3des 解密            string Decrypt3Des = DESHelper.Decrypt3Des(Encrypt3Des, KEY, CipherMode.CBC, IV);            Console.WriteLine("解密密之后：" + Decrypt3Des);            Console.ReadKey();        }

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