PHP版3DES加解密类

<?php
/**
*
* PHP版3DES加解密类
*
* 可与java的3DES(DESede)加密方式兼容
*
* @Author:蓝凤(ilanfeng.com)
*
* @version: V0.1 2011.02.18
*
*/
class Cc3des{

//加密的时候只用替换key就行了，ecb模式不需要提供iv值
public $key    = "0123456789QWEQWEEWQQ1234";
public $iv    = "33889955"; //like java: private static byte[] myIV = { 50, 51, 52, 53, 54, 55, 56, 57 };

//解密
public function decrypt($string) {
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
srand();
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$key = substr($this->key, 0, mcrypt_enc_get_key_size($td));
mcrypt_generic_init($td, $key, $iv);
$value = @pack("H*", $string);
$ret = trim(mdecrypt_generic($td, $value));
// 去掉多余的补位
$ret = $this->pkcs5_unpad($ret);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}

//加密
public function encrypt($value) {
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
srand();
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$key = substr($this->key, 0, mcrypt_enc_get_key_size($td));
mcrypt_generic_init($td, $key, $iv);
$value = $this->pkcs5_pad($value, mcrypt_get_block_size(MCRYPT_3DES, 'ecb'));
$ret = mcrypt_generic($td, $value);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return strtoupper(bin2hex($ret));
}

/*
* 位数补齐
*/
private function pkcs5_pad($text, $blocksize) {
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}

/*
* 去除补位
*/
private 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);
}
}

?>