[DEncrypt] Encrypt--加密/解密/MD5加密 （转载）

点击下载  Encrypt.zip

这个类是关于加密，解密的操作，文件的一些高级操作
1.Encrypt加密
2.Encrypt解密
3.Encrypt MD5加密
看下面代码吧

/// <summary>
/// 类说明：Assistant
/// 编 码 人：苏飞
/// 联系方式：361983679  
/// 更新网站：[url=http://www.cckan.net/thread-655-1-1.html]http://www.cckan.net/thread-655-1-1.html[/url]
/// </summary>
using System;
using System.Security.Cryptography;
using System.IO;
 
namespace DotNet.Utilities
{
  /// <summary>
  /// 加密解密实用类。
  /// </summary>
  public class Encrypt
  {
    //密钥
    private static byte[] arrDESKey = new byte[] {42, 16, 93, 156, 78, 4, 218, 32};
    private static byte[] arrDESIV = new byte[] {55, 103, 246, 79, 36, 99, 167, 3};
 
    /// <summary>
    /// 加密。
    /// </summary>
    /// <param name="m_Need_Encode_String"></param>
    /// <returns></returns>
    public static string Encode(string m_Need_Encode_String)
    {
      if (m_Need_Encode_String == null)
      {
        throw new Exception("Error: 
源字符串为空！！");
      }
      DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
      MemoryStream objMemoryStream = new MemoryStream();
      CryptoStream objCryptoStream = new CryptoStream(objMemoryStream,objDES.CreateEncryptor(arrDESKey,arrDESIV),CryptoStreamMode.Write);
      StreamWriter objStreamWriter = new StreamWriter(objCryptoStream);
      objStreamWriter.Write(m_Need_Encode_String);
      objStreamWriter.Flush();
      objCryptoStream.FlushFinalBlock();
      objMemoryStream.Flush();
      return Convert.ToBase64String(objMemoryStream.GetBuffer(), 0, (int)objMemoryStream.Length);
    }
 
    /// <summary>
    /// 解密。
    /// </summary>
    /// <param name="m_Need_Encode_String"></param>
    /// <returns></returns>
    public static string Decode(string m_Need_Encode_String)
    {
      if (m_Need_Encode_String == null)
      {
        throw new Exception("Error: 
源字符串为空！！");
      }
      DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
      byte[] arrInput = Convert.FromBase64String(m_Need_Encode_String);
      MemoryStream objMemoryStream = new MemoryStream(arrInput);
      CryptoStream objCryptoStream = new CryptoStream(objMemoryStream,objDES.CreateDecryptor(arrDESKey,arrDESIV),CryptoStreamMode.Read);
      StreamReader  objStreamReader  = new StreamReader(objCryptoStream);
      return objStreamReader.ReadToEnd();
    }
 
        /// <summary>
        /// md5
        /// </summary>
        /// <param name="encypStr"></param>
        /// <returns></returns>
        public static string Md5(string encypStr)
        {
            string retStr;
            MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();
            byte[] inputBye;
            byte[] outputBye;
            inputBye = System.Text.Encoding.ASCII.GetBytes(encypStr);
            outputBye = m5.ComputeHash(inputBye);
            retStr = Convert.ToBase64String(outputBye);
            return (retStr);
        }
  }
}