C#的3DES加密解密算法实例代码

c#类如下：

using system;
using system.collections.generic;
using system.text;
using system.security.cryptography;
using system.io;

namespace consoleapplication1
{
    /// <summary>
    /// 加解密类
    /// </summary>
    public class encrypthelper
    {
       

        //构造一个对称算法
        private symmetricalgorithm mcsp = new tripledescryptoserviceprovider();

        #region 加密解密函数

        /// <summary>
        /// 字符串的加密
        /// </summary>
        /// <param name="value">要加密的字符串</param>
        /// <param name="skey">密钥，必须32位</param>
        /// <param name="siv">向量，必须是12个字符</param>
        /// <returns>加密后的字符串</returns>
        public string encryptstring(string value, string skey,string siv)
        {
            try
            {
                icryptotransform ct;
                memorystream ms;
                cryptostream cs;
                byte[] byt;
                mcsp.key = convert.frombase64string(skey);
                mcsp.iv = convert.frombase64string(siv);
                //指定加密的运算模式
                mcsp.mode = system.security.cryptography.ciphermode.ecb;
                //获取或设置加密算法的填充模式
                mcsp.padding = system.security.cryptography.paddingmode.pkcs7;
                ct = mcsp.createencryptor(mcsp.key, mcsp.iv);//创建加密对象
                byt = encoding.utf8.getbytes(value);
                ms = new memorystream();
                cs = new cryptostream(ms, ct, cryptostreammode.write);
                cs.write(byt, 0, byt.length);
                cs.flushfinalblock();
                cs.close();

                return convert.tobase64string(ms.toarray());
            }
            catch (exception ex)
            {
                //messagebox.show(ex.message, "出现异常", messageboxbuttons.ok, messageboxicon.warning);
                return ("error in encrypting " + ex.message);
            }
        }

        /// <summary>
        /// 解密字符串
        /// </summary>
        /// <param name="value">加密后的字符串</param>
        /// <param name="skey">密钥，必须32位</param>
        /// <param name="siv">向量，必须是12个字符</param>
        /// <returns>解密后的字符串</returns>
        public string decryptstring(string value, string skey, string siv)
        {
            try
            {
                icryptotransform ct;//加密转换运算
                memorystream ms;//内存流
                cryptostream cs;//数据流连接到数据加密转换的流
                byte[] byt;
                //将3des的密钥转换成byte
                mcsp.key = convert.frombase64string(skey);
                //将3des的向量转换成byte
                mcsp.iv = convert.frombase64string(siv);
                mcsp.mode = system.security.cryptography.ciphermode.ecb;
                mcsp.padding = system.security.cryptography.paddingmode.pkcs7;
                ct = mcsp.createdecryptor(mcsp.key, mcsp.iv);//创建对称解密对象
                byt = convert.frombase64string(value);
                ms = new memorystream();
                cs = new cryptostream(ms, ct, cryptostreammode.write);
                cs.write(byt, 0, byt.length);
                cs.flushfinalblock();
                cs.close();

                return encoding.utf8.getstring(ms.toarray());
            }
            catch (exception ex)
            {
                //messagebox.show(ex.message, "出现异常", messageboxbuttons.ok, messageboxicon.warning);
                return ("error in decrypting " + ex.message);
            }
        }

        #endregion
    }
}

调用方法如下：

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;

namespace consoleapplication1
{
    class program
    {
        static void main(string[] args)
        {
            encrypthelper helper = new encrypthelper();

            //加密
            string oldvalue = "13800138000";
            //加密后结果
            //密钥,必须32位
            string skey = "qjzgeh6heszdvjecnfpguxzaib7nlqm5";
            //向量，必须是12个字符
            string siv = "andyliu1234=";
            //print
            string newvalue =  helper.encryptstring(oldvalue,skey,siv);
            console.writeline("加密后:"+ newvalue);
            //解密
            string desvalue = helper.decryptstring(newvalue,skey,siv);
            //
            console.writeline("解密后:"+ desvalue);
            console.readline();

        }
    }
}