C#加密解密DES字符串轉

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;namespace Component
{public class Security{public Security(){ }//默認密鑰向量private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };/**//**//** <summary>/// DES加密字符串/// </summary>/// <param name="encryptString">待加密的字符串</param>/// <param name="encryptKey">加密密鑰,要求為8位</param>/// <returns>加密成功返回加密后的字符串，失敗返回源串</returns>public static string EncryptDES(string encryptString, string encryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));byte[] rgbIV = Keys;byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());}catch{return encryptString;}}/**//**//** <summary>/// DES解密字符串/// </summary>/// <param name="decryptString">待解密的字符串</param>/// <param name="decryptKey">解密密鑰,要求為8位,和加密密鑰相同</param>/// <returns>解密成功返回解密后的字符串，失敗返源串</returns>public static string DecryptDES(string decryptString, string decryptKey){try{byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);byte[] rgbIV = Keys;byte[] inputByteArray = Convert.FromBase64String(decryptString);DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();return Encoding.UTF8.GetString(mStream.ToArray());}catch{return decryptString;}} }
}

轉自：http://www.cnblogs.com/yiki/archive/2007/08/28/872373.html