PHP中使用DES加密解密

<?php
namespace Common\ORG\Api;
use Eframe\Logic\ConfigLogic;
use Think\Exception; 

class Descode 
{     
    /** 
     * 解密函数 
     * 算法：des 
     * 加密模式：ecb 
     * 补齐方法：PKCS5 
     * @param unknown_type $input 
     */       
    public static  function encryptForDES($input,$key)   
    {         
       $size = mcrypt_get_block_size('des','ecb');  
       $input = self::pkcs5_pad($input, $size); 
       $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);  
       $data = base64_encode($data);  // bin2hex($data)
       return $data;  
       
       
    }
    
    
    public static  function decryptForDES($input,$key)   
    {   
       $input = base64_decode($input); 
       $size = mcrypt_get_block_size('des','ecb');  
       $td = mcrypt_module_open('des', '', 'ecb', '');  
       $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);  
       @mcrypt_generic_init($td, $key, $iv);  
       $data = mdecrypt_generic($td, $input);  
       mcrypt_generic_deinit($td);  
       mcrypt_module_close($td);  
       $data = self::pkcs5_unpad($data, $size);    
       return $data; 
      
         
    }    
    
             
    public static  function pkcs5_pad ($text, $blocksize)   
    {         
       $pad = $blocksize - (strlen($text) % $blocksize);  
       return $text . str_repeat(chr($pad), $pad);  
    } 
        
    public static  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);  
    }  
}