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asp.net代码练习 work078 DES加密解密的示例

程序员文章站 2024-03-13 23:08:46
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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" OnClick="Button1_Click" />
                </td>
                <td>
                    <asp:Button ID="Button2" runat="server" Text="DES解密" OnClick="Button2_Click" />
                </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;
            }



        }






    }

   
}

相关标签: asp.net c# c#