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: Luo Hui (farmer.luo at gmail.com)
*
* @version: V0.1 2008.12.04
*
*/
class ReversableEncrypt
{    
    public $key    = "Crahafagusw74ecr2meb7edaHezAwrU2";
    public $iv    = "23456789"; //like java: private static byte[] myIV = { 50, 51, 52, 53, 54, 55, 56, 57 };
    
    
    /**
     * 3des加密
     * 
     * @param    string        $input            明文
     * @return string
     */
    public function encrypt($input)
    {
        $input = $this->padding( $input );
        $key = base64_decode($this->key);
        $td = mcrypt_module_open( MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
        //使用MCRYPT_3DES算法,cbc模式
        mcrypt_generic_init($td, $key, $this->iv);
        //初始处理
        $data = mcrypt_generic($td, $input);
        //加密
        mcrypt_generic_deinit($td);
        //结束
        mcrypt_module_close($td);
        $data = $this->removeBR(base64_encode($data));
        return $data;
    }

    /**
     * 3des解密
     * 
     * @param    string        $encrypted            密文
     * @return string
     */
    public function decrypt($encrypted)
    {
        $encrypted = base64_decode($encrypted);
        $key = base64_decode($this->key);
        $td = mcrypt_module_open( MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
        //使用MCRYPT_3DES算法,cbc模式
        mcrypt_generic_init($td, $key, $this->iv);
        //初始处理
        $decrypted = mdecrypt_generic($td, $encrypted);
        //解密
        mcrypt_generic_deinit($td);
        //结束
        mcrypt_module_close($td);
        $decrypted = $this->removePadding($decrypted);
        return $decrypted;
    }

    /**
     * 填充密码，填充至8的倍数
     * 
     * @param    string        $str            原始字串
     * @return string
     */
    public function padding($str) {
        $len = 8 - strlen($str) % 8;
        for ($i = 0; $i < $len; $i++) {
            $str .= chr(0);
        }
        return $str ;
    }

    /**
     * 删除填充符
     * 
     * @param    string        $str            原始字串
     * @return string
     */
    public function removePadding( $str )
    {
        $len = strlen( $str );
        $newstr = "";
        $str = str_split($str);
        for ($i = 0; $i < $len; $i++ )
        {
            if ($str[$i] != chr( 0 ))
            {
                $newstr .= $str[$i];
            }
        }
        return $newstr;
    }
    
    
    /**
     * 删除回车和换行
     * 
     * @param    string        $str            原始字串
     * @return string
     */
    public function removeBR($str) {
        $len = strlen( $str );
        $newstr = "";
        $str = str_split($str);
        for ($i = 0; $i < $len; $i++) {
            if ($str[$i] != '
' && $str[$i] != '
') {
                $newstr .= $str[$i];
            }
        }
        return $newstr;
    }
}
?>