C# 3DES操作方法

#region 3des加密

        /// 

        /// 3des ecb模式加密
        /// 
        /// 待加密的字符串
        /// 密钥
        /// 加密矢量：只有在CBC解密模式下才适用
        /// 运算模式
        /// 加密后的字符串
        public static string Encrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")
        {
            try
            {
                aStrKey = aStrKey.Substring(0, 24);
                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);
                return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));
            }
            catch (Exception e)
            {
                return string.Empty;
            }
        }

        #endregion

        #region 3des解密

        /// 

        /// des 解密
        /// 
        /// 加密的字符串
        /// 密钥
        /// 解密矢量：只有在CBC解密模式下才适用
        /// 运算模式
        /// 解密的字符串
        public static string Decrypt3Des(string aStrString, string aStrKey, CipherMode mode = CipherMode.ECB, string iv = "12345678")
        {
            try
            {
                aStrKey = aStrKey.Substring(0, 24);
                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