C# 與JAVA 共用的DES 加密解密方法

本文摘自:http://www.cnblogs.com/hinslam/archive/2011/07/19/2110779.html

 

C# 與JAVA 共用的DES 加密解密方法

C# code

using System;
using System.Collections.Generic;
using System.Text;

using System.ComponentModel;
using System.Data;
using System.Drawing;

using System.Configuration;
using System.Web;
using System.Security.Cryptography;
using System.IO;  

namespace Encryption
{
    public class Encryptor
    {

        #region encryption
        public static string DESEncryption(string pToEncrypt, string sKey)
        {
            // string pToEncrypt1 = HttpContext.Current.Server.UrlEncode(pToEncrypt);  
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }
        #endregion

        #region decryption
        public static string DESDecryption(string pToDecrypt, string sKey)
        {
            //    HttpContext.Current.Response.Write(pToDecrypt + "<br>" + sKey);  
            //    HttpContext.Current.Response.End();  
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            StringBuilder ret = new StringBuilder();

            // return HttpContext.Current.Server.UrlDecode(System.Text.Encoding.Default.GetString(ms.ToArray()));
            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }
        #endregion  

    }
}

Java code

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class Encryptor {
   
public static String decrypt(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);
    }

    public static byte[] encrypt(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"));
    }

    public static byte[] convertHexString(String ss)
    {
    byte digest[] = new byte[ss.length() / 2];
    for(int i = 0; i < digest.length; i++)
    {
    String byteString = ss.substring(2 * i, 2 * i + 2);
    int byteValue = Integer.parseInt(byteString, 16);
    digest[i] = (byte)byteValue;
    }

    return digest;
    } 
}