C#的DES加密解密算法【vs2005】

C#的DES加密解密算法【vs2005】

des是常用的对称加密解密方法，下面是C#下的核心代码

/**//// <summary>
        /// 进行DES加密。
        /// </summary>
        /// <param name="pToEncrypt">要加密的字符串。</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>以Base64格式返回的加密字符串。</returns>
        public string Encrypt(string pToEncrypt, string sKey)
        {
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }

        /**//// <summary>
        /// 进行DES解密。
        /// </summary>
        /// <param name="pToDecrypt">要解密的以Base64</param>
        /// <param name="sKey">密钥，且必须为8位。</param>
        /// <returns>已解密的字符串。</returns>
        public string Decrypt(string pToDecrypt, string sKey)
        {
            byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }

在代码中还要应用个类库：using System.Security.Cryptography;
des加密在java中也有相应的算法，而且和.net下的一致，可以用于不同语言编写的系统的加解密调用
下面一段为java下的des加密，C#下的解密小例子：

java中使用DES加密，C#中解密过程如下，
java中的加密代码，DES.java类代码：

————————————————————————————————————————————————
package welcome;

import javax.crypto.*;
import javax.crypto.*;
import java.io.UnsupportedEncodingException;
import java.security.spec.*;
import javax.crypto.spec.*;

public class DES {

    public DES()
    {
    }

     public String encrypt(String str) {

        byte[] enc = null;
        try {
          enc = desEncrypt(str, "abcdefgh");
        }
        catch (Exception ex) {
        }

         return new sun.misc.BASE64Encoder().encode(enc);
     }

     public static byte[] desEncrypt(String message, String key) throws Exception {
             Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

             DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

             SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
             SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
             IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
             cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

             return cipher.doFinal(message.getBytes("UTF-8"));
         }
}

————————————————————————————————————————————————

调用示例代码，jsp1.jsp:

————————————————————————————————————————————————

<%@ page contentType="text/html; charset=gb2312" %>
<jsp:useBean id="DES" scope="page" class="welcome.DES" />
<html>
<head><title>DES File</title></head>

<body bgcolor="#FFFFFF">
<div align="center"><center>
<%
String Test = request.getParameter("Test");
if(Test==null || Test.equals("")) {
%>
    <form name="form" method="post" action="jsp1.jsp">
    <input type="text" name="Test" size="25" value=""/>
    <input type="submit" name="button" value=" 确定 "/>
    </form>
    <%
}else{
            out.println("加密前的数据："+Test +"<br/>");
            out.println("加密后的数据："+DES.encrypt(Test) +"<br/><a href='http://localhost:9003/JiaMi.aspx?str="+DES.encrypt(Test)+"' target=_blank>连接</a>");
      }
    %>
</center></div>
</body>
</html>

————————————————————————————————————————————————

C#中的解码函数：

/// <summary>
/// 进行DES解密。
/// </summary>
/// <param name="pToDecrypt">要解密的以Base64</param>
/// <returns>已解密的字符串。</returns>
public string Decrypt(string pToDecrypt,string sKey)
{
    byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
    using(DESCryptoServiceProvider des = new DESCryptoServiceProvider())
    {
        des.Key=ASCIIEncoding.ASCII.GetBytes(sKey);
        des.IV=ASCIIEncoding.ASCII.GetBytes(sKey);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        using(CryptoStream cs = new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Write))
        {
            cs.Write(inputByteArray,0,inputByteArray.Length);
            cs.FlushFinalBlock();
            cs.Close();
        }
        string str = Encoding.UTF8.GetString(ms.ToArray());
        ms.Close();
        return str;
    }
}
————————————————————————————————————————————————
调用：
string str = Page.Request.QueryString["str"];
Page.Response.Write("得到的为："+Decrypt(str,"abcdefgh"));
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原文地址：https://www.cnblogs.com/weekzero/p/983143.html