asp.net代码练习 work078 DES加密解密的示例

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webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="work078.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <title>DES加密解密的示例</title>
</head>
<body>
  <form id="form1" runat="server">
  <div>
    <table border="0">
      <tr>
        <td colspan="2" align="center">DES加密解密的示例</td>
      </tr>
      <tr>
        <td>
          <asp:TextBox ID="txtSource" runat="server" Columns="24" Rows="6" TextMode="MultiLine"></asp:TextBox>
        </td>
        <td>
          <asp:TextBox ID="txtResult" runat="server" Columns="24" Rows="6" TextMode="MultiLine"></asp:TextBox>
        </td>
      </tr>
      <tr>
        <td>
          <asp:Button ID="Button1" runat="server" Text="DES加密"  />
        </td>
        <td>
          <asp:Button ID="Button2" runat="server" Text="DES解密"  />
        </td>
      </tr>
    </table>
  </div>
  </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace work078
{
  public partial class WebForm1 : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
      string sourceStr = txtSource.Text;
      txtSource.Text = DESProvider.EncryptString(sourceStr);
      txtResult.Text = DESProvider.EncryptString(sourceStr);
    }
    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button2_Click(object sender, EventArgs e)
    {
      txtResult.Text = DESProvider.DecryptString(txtResult.Text);
    }
  }
}

desprovider.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace work078
{
  /// <summary>
  /// DES 算法加密 / 解密
  /// </summary>
  public class DESProvider
  {
    private DESProvider()
    { 
    
    }
    //默认秘钥
    private static string key = "abcdefgh";
    /// <summary>
    /// 获取，设置 秘钥
    /// </summary>
    public static string Key
    {
      get 
      { 
        return DESProvider.key; 
      }
      set 
      { 
        DESProvider.key = value; 
      }
    }
    /// <summary>
    /// DES加密
    /// </summary>
    /// <param name="enString"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string EncryptString(string enString, string key)
    {
      if (string.IsNullOrEmpty(enString))
      {
        throw new ArgumentNullException("enString", "不能为空");
      }
      if (string.IsNullOrEmpty(key))
      {
        throw new ArgumentNullException("key","不能为空");
      }
      //将秘钥转换成字节数组
      byte[] keyBytes = System.Text.Encoding.UTF8.GetBytes(key);
      //设置初始化向量
      byte[] keyIV = keyBytes;
      //将加密字符串转换成UTF8编码的字节数组
      byte[] inputByteArray = System.Text.Encoding.UTF8.GetBytes(enString);
      //
      byte[] resultByteArray = EncryBytes(inputByteArray, keyBytes, keyIV);
      return Convert.ToBase64String(resultByteArray);
    }
    /// <summary>
    /// DES加密
    /// </summary>
    /// <param name="enString"></param>
    /// <returns></returns>
    public static string EncryptString(string enString)
    {
      return EncryptString(enString, DESProvider.Key);
    }
    /// <summary>
    /// 
    /// </summary>
    /// <param name="sourceBytes"></param>
    /// <param name="keyBytes"></param>
    /// <param name="keyIV"></param>
    /// <returns></returns>
    private static byte[] EncryBytes(byte[] sourceBytes, byte[] keyBytes, byte[] keyIV)
    {
      if (sourceBytes == null || keyBytes == null || keyIV == null)
      {
        throw new ArgumentNullException("sourceBytes和keyBytes", "不能为空");
      }
      else
      {
        keyBytes = CheckByteArrayLength(keyBytes);
        keyIV = CheckByteArrayLength(keyIV);
        System.Security.Cryptography.DESCryptoServiceProvider provider = new System.Security.Cryptography.DESCryptoServiceProvider();
        System.IO.MemoryStream mStream = new System.IO.MemoryStream();
        System.Security.Cryptography.CryptoStream cStream = new System.Security.Cryptography.CryptoStream(mStream, provider.CreateEncryptor(keyBytes,keyIV), System.Security.Cryptography.CryptoStreamMode.Write);
        cStream.Write(sourceBytes, 0, sourceBytes.Length);
        cStream.FlushFinalBlock();
        byte[] buffer = mStream.ToArray();
        mStream.Close();
        cStream.Close();
        return buffer;
      }
    }
    /// <summary>
    /// 检查秘钥或初始化向量长度，如果不是8的倍数或长度大于64，则截取前8个元素
    /// </summary>
    /// <param name="byteArray"></param>
    /// <returns></returns>
    private static byte[] CheckByteArrayLength(byte[] byteArray)
    {
      byte[] resultBytes = new byte[8];
      if (byteArray.Length < 8)
      {
        return System.Text.Encoding.UTF8.GetBytes("12345678");
      }
      else if (byteArray.Length % 8 != 0 || byteArray.Length > 64)
      {
        //复制前8位
        Array.Copy(byteArray, 0, resultBytes, 0, 8);
        return resultBytes;
      }
      else
      {
        return byteArray;
      }
    }
    /// <summary>
    /// 解密
    /// </summary>
    /// <param name="deString"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string DecryptString(string deString, string key)
    {
      if (string.IsNullOrEmpty(deString))
      {
        throw new ArgumentNullException("deString", "不能为空");
      }
      if (string.IsNullOrEmpty(key))
      {
        throw new ArgumentNullException("key", "不能为空");
      }
      byte[] keyBytes = System.Text.Encoding.UTF8.GetBytes(key);
      byte[] keyIV = keyBytes;
      byte[] inputByteArray = Convert.FromBase64String(deString);
      byte[] resultByteArray = DecryptBytes(inputByteArray, keyBytes, keyIV);
      return System.Text.Encoding.UTF8.GetString(resultByteArray);
    }

    public static string DecryptString(string deString)
    {
      return DecryptString(deString,DESProvider.Key);
    }
    /// <summary>
    /// 
    /// </summary>
    /// <param name="sourceBytes"></param>
    /// <param name="keyBytes"></param>
    /// <param name="keyIV"></param>
    /// <returns></returns>
    private static byte[] DecryptBytes(byte[] sourceBytes, byte[] keyBytes, byte[] keyIV)
    {
      if (sourceBytes == null || keyBytes == null || keyIV == null)
      {
        throw new ArgumentNullException("sourceBytes，keyBytes，keyIV", "不能为空");
      }
      else
      {
        keyBytes = CheckByteArrayLength(keyBytes);
        keyIV = CheckByteArrayLength(keyIV);
        System.Security.Cryptography.DESCryptoServiceProvider provider = new System.Security.Cryptography.DESCryptoServiceProvider();
        System.IO.MemoryStream mStream = new System.IO.MemoryStream();
        System.Security.Cryptography.CryptoStream cStream = new System.Security.Cryptography.CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), System.Security.Cryptography.CryptoStreamMode.Write);
        cStream.Write(sourceBytes, 0, sourceBytes.Length);
        cStream.FlushFinalBlock();
        byte[] buffer = mStream.ToArray();
        mStream.Close();
        cStream.Close();
        return buffer;
      }

    }



  }
   
}

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