/// <summary>/// .Net加密解密帮助类/// </summary>public class NetCryptoHelper{    /// <summary>    /// Des默认密钥向量    /// </summary>    public static byte[] DesIv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };    /// <summary>    /// Des加解密钥必须8位    /// </summary>    public const string DesKey = "deskey8w";    /// <summary>    /// Des加密    /// </summary>    /// <param name="source">源字符串</param>    /// <param name="key">des密钥，长度必须8位</param>    /// <param name="iv">密钥向量</param>    /// <returns>加密后的64位字符串</returns>    public static string EncryptDes(string source, string key, byte[] iv)    {        try        {            byte[] rgbKeys = Encoding.UTF8.GetBytes(key.Length > 8 ? key.Substring(0, 8) : key);            byte[] rgbIvs = iv;            byte[] inputByteArray = Encoding.UTF8.GetBytes(source);            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();            MemoryStream memoryStream = new MemoryStream();            CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateEncryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write);            cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);            cryptoStream.FlushFinalBlock();            // 1.第一种            return Convert.ToBase64String(memoryStream.ToArray());            // 2.第二种            //StringBuilder result = new StringBuilder();            //foreach (byte b in memoryStream.ToArray())            //{            //    result.AppendFormat("{0:X2}", b);            //}            //return result.ToString();        }        catch        {            return source;        }    }    /// <summary>    /// Des解密    /// </summary>    /// <param name="source">源字符串</param>    /// <param name="key">des密钥，长度必须8位</param>    /// <param name="iv">密钥向量</param>    /// <returns>解密后的字符串</returns>    public static string DecryptDes(string source, string key, byte[] iv)    {        try        {            byte[] rgbKeys = Encoding.UTF8.GetBytes(key.Length > 8 ? key.Substring(0, 8) : key);            byte[] rgbIvs = iv;            byte[] inputByteArray = Convert.FromBase64String(source);            DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();            MemoryStream memoryStream = new MemoryStream();            CryptoStream cryptoStream = new CryptoStream(memoryStream, desProvider.CreateDecryptor(rgbKeys, rgbIvs), CryptoStreamMode.Write);            cryptoStream.Write(inputByteArray, 0, inputByteArray.Length);            cryptoStream.FlushFinalBlock();            return Encoding.UTF8.GetString(memoryStream.ToArray());        }        catch        {            return source;        }    }}

class Program{    static void Main(string[] args)    {        string plainText = "博客园",            encryptString = NetCryptoHelper.EncryptDes(plainText, NetCryptoHelper.DesKey, NetCryptoHelper.DesIv);        Console.WriteLine("加密前的字符串:{0}", plainText);        Console.WriteLine("加密后的字符串:{0}", encryptString);        Console.WriteLine("解密后的字符串:{0}", NetCryptoHelper.DecryptDes(encryptString, NetCryptoHelper.DesKey, NetCryptoHelper.DesIv));        Console.ReadKey();    }}