Encrypt and Decrypt

using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;

//默认密钥向量
private static byte[] Keys = { 0x120x340x560x780x900xAB0xCD0xEF };
/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString">待加密的字符串</param>
/// <param name="encryptKey">加密密钥,要求为8位</param>
/// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
public static string EncryptDES(string encryptString, string encryptKey)
{
    
try
    {
        
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(08));
        
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">解密密钥,要求为8位,和加密密钥相同</param>
/// <returns>解密成功返回解密后的字符串,失败返源串</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;
    }
}
posted @ 2010-01-22 16:38  只想做好  阅读(788)  评论(0编辑  收藏  举报