PHP与Java使用des加密通讯

原文:http://toptulip.iteye.com/blog/780309 使用php加密字符串,生成密文,java解析密文还原字符串.
Java的部分直接复制调不通,改了下,下面的代码是能正常运行的。
php:


<?php
class DES
{
	var $key;
	var $iv; //偏移量

	function DES($key, $iv=0)
	{
		$this->key = $key;
		if($iv == 0)
		{
			$this->iv = $key;
		}
		else 
		{
			$this->iv = $iv;
		}
	}

	//加密
	function encrypt($str)
	{		
		$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
		$str = $this->pkcs5Pad ( $str, $size );
		
		$data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
		//$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串
		return base64_encode($data);
	}
    
	//解密
	function decrypt($str)
	{
		$str = base64_decode ($str);
		//$strBin = $this->hex2bin( strtolower($str));
		$str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv );
		$str = $this->pkcs5Unpad( $str );
		return $str;
	}

	function hex2bin($hexData)
	{
		$binData = "";
		for($i = 0; $i < strlen ( $hexData ); $i += 2)
		{
			$binData .= chr(hexdec(substr($hexData, $i, 2)));
		}
		return $binData;
	}

	function pkcs5Pad($text, $blocksize)
	{
		$pad = $blocksize - (strlen ( $text ) % $blocksize);
		return $text . str_repeat ( chr ( $pad ), $pad );
	}

	function pkcs5Unpad($text)
	{
		$pad = ord ( $text {strlen ( $text ) - 1} );
		if ($pad > strlen ( $text ))
			return false;
		if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
			return false;
		return substr ( $text, 0, - 1 * $pad );
	}
}
$str = 'abcd';
$key= 'asdfwef5';
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);

echo  $str.' <=> '.$mstr;

?>

java:


package com.test;

import it.sauronsoftware.base64.Base64;

import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

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

public class Main
{
    public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
    /**
     * DES算法,加密
     *
     * @param data 待加密字符串
     * @param key  加密私钥,长度不能够小于8位
     * @return 加密后的字节数组,一般结合Base64编码使用
     * @throws CryptException 异常
     */
    public static String encode(String key,String data) throws Exception
    {
        return encode(key, data.getBytes());
    }
    /**
     * DES算法,加密
     *
     * @param data 待加密字符串
     * @param key  加密私钥,长度不能够小于8位
     * @return 加密后的字节数组,一般结合Base64编码使用
     * @throws CryptException 异常
     */
    public static String encode(String key,byte[] data) throws Exception
    {
        try
        {
	    	DESKeySpec dks = new DESKeySpec(key.getBytes());
	    	
	    	SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            //key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes());
            AlgorithmParameterSpec paramSpec = iv;
            cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
            
            byte[] bytes = cipher.doFinal(data);
            

//            return byte2hex(bytes);
            return new String(Base64.encode(bytes));
        } catch (Exception e)
        {
            throw new Exception(e);
        }
    }

    /**
     * DES算法,解密
     *
     * @param data 待解密字符串
     * @param key  解密私钥,长度不能够小于8位
     * @return 解密后的字节数组
     * @throws Exception 异常
     */
    public static byte[] decode(String key,byte[] data) throws Exception
    {
        try
        {
        	SecureRandom sr = new SecureRandom();
	    	DESKeySpec dks = new DESKeySpec(key.getBytes());
	    	SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            //key的长度不能够小于8位字节
            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes());
            AlgorithmParameterSpec paramSpec = iv;
            cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
            return cipher.doFinal(data);
        } catch (Exception e)
        {
            throw new Exception(e);
        }
    }
    
    /**
     * 获取编码后的值
     * @param key
     * @param data
     * @return
     * @throws Exception
     */
    public static String decodeValue(String key,String data) 
    {
    	byte[] datas;
    	String value = null;
		try {

	    		datas = decode(key, Base64.decode(data.getBytes()));
			
			value = new String(datas);
		} catch (Exception e) {
			value = "";
		}
    	return value;
    }

    public static void main(String[] args) throws Exception
    {
    	System.out.println("明:abcd ;密:" + Main.encode("asdfwef5","abcd"));
    }
}

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