DEC 加密和解密

DEC 加密和解密通用帮助类：

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Security.Cryptography;using System.Text;using System.IO;/// <summary>///DEC 的摘要说明/// </summary>public class DEC{    public DEC()    {        //        //TODO: 在此处添加构造函数逻辑        //    }    /// <summary>    /// DEC 加密过程    /// </summary>    /// <param name="pToEncrypt">被加密的字符串</param>    /// <param name="sKey">密钥（只支持8个字节的密钥）</param>    /// <returns>加密后的字符串</returns>    public static string Encrypt(string pToEncrypt, string sKey)    {        //访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象        DESCryptoServiceProvider des = new DESCryptoServiceProvider();        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法        byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);//把字符串放到byte数组中        MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流　        //定义将数据流链接到加密转换的流        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);        cs.Write(inputByteArray, 0, inputByteArray.Length);        cs.FlushFinalBlock();        //上面已经完成了把加密后的结果放到内存中去        StringBuilder ret = new StringBuilder();        foreach (byte b in ms.ToArray())        {            ret.AppendFormat("{0:X2}", b);        }        ret.ToString();        return ret.ToString();    }    /**/    /// <summary>    /// DEC 解密过程    /// </summary>    /// <param name="pToDecrypt">被解密的字符串</param>    /// <param name="sKey">密钥（只支持8个字节的密钥，同前面的加密密钥相同）</param>    /// <returns>返回被解密的字符串</returns>    public static string Decrypt(string pToDecrypt, string sKey)    {        DESCryptoServiceProvider des = new DESCryptoServiceProvider();        byte[] inputByteArray = new byte[pToDecrypt.Length / 2];        for (int x = 0; x < pToDecrypt.Length / 2; x++)        {            int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));            inputByteArray[x] = (byte)i;        }        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量，此值重要，不能修改        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);        MemoryStream ms = new MemoryStream();        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);        cs.Write(inputByteArray, 0, inputByteArray.Length);        cs.FlushFinalBlock();        //建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象        StringBuilder ret = new StringBuilder();        return System.Text.Encoding.Default.GetString(ms.ToArray());    }}

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