<?php
/**
*
* PHP版DES加解密类
*
* 可与java、c#的3DES(DESede)加密方式兼容
*
* @Author: Luo Hui (farmer.luo at gmail.com) update by melec 2010-10-25
*
* @version: V0.1 2008.12.04
* @version: V0.2 2010.05.28
* @version: V0.3 2010.10.25 增加华为特殊处理支持
*
*/
class CryptDES {

    var $key	=	'yanglong';

	function CryptDES($key='') {
		if($key) $this->key = $key;
    }

	function setKey($key){
		$this->key = $key;
	}

    function encrypt($input,$type='default') {
        $size = mcrypt_get_block_size('des', 'ecb');
        $input = $this->pkcs5_pad($input, $size);
        $key = $this->key;
        $td = mcrypt_module_open('des', '', 'ecb', '');
        $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        @mcrypt_generic_init($td, $key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        //标准处理方法
		//$data = base64_encode($data);
		//java处理格式.2进制加密串转16进制.每两个字符分割的大写字符串.
		$data	=	$this->outputFilter($data,$type);
        return $data;
    }
    function decrypt($encrypted,$type='default') {
        //标准处理方法
		//$encrypted = base64_decode($encrypted);
		//java处理格式
        $encrypted = $this->inputFilter($encrypted,$type);
		$key =$this->key;
        $td = mcrypt_module_open('des','','ecb','');
        //使用MCRYPT_DES算法,cbc模式
        $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        $ks = mcrypt_enc_get_key_size($td);
        @mcrypt_generic_init($td, $key, $iv);
        //初始处理
        $decrypted = mdecrypt_generic($td, $encrypted);
        //解密
        mcrypt_generic_deinit($td);
        //结束
        mcrypt_module_close($td);
        $y=$this->pkcs5_unpad($decrypted);
        return $y;
    }
    function pkcs5_pad ($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }
    function pkcs5_unpad($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 * $pad);
    }
	function inputFilter($data,$type='base64_decode'){
		if($type=='java'){
			//去掉分割符 -
			//如：AB-34-12-3D => AB34123D
			$data	=	str_replace('-','',$data);
			//16进制转成2进制字符串
			$data	=	pack('H*',$data);
		}else{
			$data	=	base64_decode($data);
		}
		return $data;
	}
	function outputFilter($data,$type='base64_encode'){
		if($type=='java'){
			//每两个字符增加一个分割符 - ，并转换成大写
			//如：ab34123d => AB-34-12-3D
			$data = strtoupper(rtrim(chunk_split(bin2hex($data),2,'-'),'-'));
		}else{
			$data	=	base64_encode($data);
		}
		return $data;
	}
}
//测试代码
//$key = "yanglong";
//$input = "abcd1234";
//$crypt = new DESEncrypt($key);
//$encrypt	=	$crypt->encrypt($input,'java');
//echo "Encode:".$encrypt."<br/>";
//echo "Decode:".$crypt->decrypt($encrypt,'java');
?>