C#与Java同步加密解密DES算法

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朋克版小红帽 2023-03-01 09:19:58 博主文章分类：技术调查

文章标签 字符串加密 ide System 字符串 文章分类 Python 后端开发

在实际项目中，往往前端和后端使用不同的语言。比如使用C#开发客户端，使用Java开发服务器端。有时出于安全性考虑需要将字符加密传输后，由服务器解密获取。本文介绍一种采用DES算法的C#与Java同步加密解密的代码

C#端代码：（注意：DES的秘钥采用8位字符）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Globalization;
using System.IO;
----------------------方法-------------------------

        ///<summary>DES字符串DES加密函数</summary>  
        ///<param name="str">被加密字符串</param>  
        ///<param name="key">密钥 </param>   
        ///<returns>加密后字符串</returns>     
        public static string EncodeDES(string str, string key)
        {
            try
            {
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] bytes = Encoding.GetEncoding("UTF-8").GetBytes(str);
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, 
                provider.CreateEncryptor(), CryptoStreamMode.Write);
                stream2.Write(bytes, 0, bytes.Length);
                stream2.FlushFinalBlock();
                StringBuilder builder = new StringBuilder();
                foreach (byte num in stream.ToArray())
                {
                    builder.AppendFormat("{0:X2}", num);
                }
                stream.Close();
                return builder.ToString();
            }
            catch (Exception) { return "xxxx"; }
        }


        ///<summary>字符串DES解密函数</summary>  
        ///<param name="str">被加密字符串</param>  
        ///<param name="key">密钥</param>   
        ///<returns>解密后字符串</returns>  
        public static string DecodeDES(string str, string key)
        {
            try
            {
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
                byte[] buffer = new byte[str.Length / 2];
                for (int i = 0; i < (str.Length / 2); i++)
                {
                    int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
                    buffer[i] = (byte)num2;
                }
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, 
                provider.CreateDecryptor(), CryptoStreamMode.Write);
                stream2.Write(buffer, 0, buffer.Length);
                stream2.FlushFinalBlock();
                stream.Close();
                return Encoding.GetEncoding("UTF-8").GetString(stream.ToArray());
            }
            catch (Exception) { return ""; }
        }

Java端代码：

package com.hbcloudwide.didaoa.chatserver.util;
 
 
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
 
import org.apache.commons.codec.digest.DigestUtils;
 
/**
 * 密码加密解密处理工具类
 * 
 * @author lee
 *
 */
public class PasswordUtil {
 
  // 解密数据
  /**
   * DES解密
   * @param message
   * @param key
   * @return
   * @throws Exception
   *
   * lee on 2016-12-26 00:28:18
   */
  public static String DecodeDES(String message, String key) throws Exception {
 
    byte[] bytesrc = convertHexString(message);
    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.DECRYPT_MODE, secretKey, iv);
    byte[] retByte = cipher.doFinal(bytesrc);
    return new String(retByte);
  }
 
  /**
   * DES加密
   * @param message
   * @param key
   * @return
   * @throws Exception
   *
   * lee on 2016-12-26 00:28:28
   */
  public static byte[] EncodeDES(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"));
  }
  
  
  
  
}