des加密

mcrypt.php

<?php
/**
 * Created by PhpStorm.
 * User: tew
 * Date: 2015/9/23
 * Time: 9:32
 */
class mcrypt{
    public static $key = '7fdc4b8e';
    public static function encode($text){
        $result = "";
        if(!empty($text)){
            $val = self::pad($text);
            $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_ECB,''); //使用MCRYPT_DES算法,cbc模式
            $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
            mcrypt_generic_init($td,self::$key,$iv);       //初始处理
            $encrypted = mcrypt_generic($td,$val);       //解密
            mcrypt_generic_deinit($td);       //结束
            mcrypt_module_close($td);
            $result = base64_encode($encrypted);
        }
        return $result;
    }

    public static function decode($encrypted){
        $result = "";
        if(!empty($encrypted)){
            $encrypted = base64_decode($encrypted);
            $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_ECB,''); //使用MCRYPT_DES算法,cbc模式
            $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
            mcrypt_generic_init($td,self::$key,$iv);       //初始处理
            $decrypted = mdecrypt_generic($td, $encrypted);       //解密
            mcrypt_generic_deinit($td);       //结束
            mcrypt_module_close($td);
            $result = self::unpad($decrypted);
        }
        return $result;
    }

    public static function pad($text,$block = 8){
        $pad = $block - (strlen($text) % $block);
        return $text . str_repeat(chr($pad), $pad);
    }

    public static function unpad($text){
        $pad = ord($text{strlen($text)-1});
        if ($pad > strlen($text))
            return $text;
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
            return $text;
        return substr($text, 0, -1 * $pad);
    }
}