PHP DES加密解密封装类

<?php
/**
* PHP版DES加解密类
* 可与java的DES(DESede/CBC/PKCS5Padding)加密方式兼容
*
*/
class CryptDes {
     var $key;
     var $iv;
     function CryptDes($key, $iv){
        $this->key = $key;
        $this->iv = $iv;
     }
      
     function encrypt($input){
         $size = mcrypt_get_block_size(MCRYPT_DES,MCRYPT_MODE_CBC); //3DES加密将MCRYPT_DES改为MCRYPT_3DES
         $input = $this->pkcs5_pad($input, $size); //如果采用PaddingPKCS7，请更换成PaddingPKCS7方法。
         $key = str_pad($this->key,8,'0'); //3DES加密将8改为24
         $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
         if( $this->iv == '' )
         {
             $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         }
         else
         {
             $iv = $this->iv;
         }
         @mcrypt_generic_init($td, $key, $iv);
         $data = mcrypt_generic($td, $input);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         $data = base64_encode($data);//如需转换二进制可改成  bin2hex 转换
         return $data;
     }
     function decrypt($encrypted){
         $encrypted = base64_decode($encrypted); //如需转换二进制可改成  bin2hex 转换
         $key = str_pad($this->key,8,'0'); //3DES加密将8改为24
         $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,'');//3DES加密将MCRYPT_DES改为MCRYPT_3DES
          if( $this->iv == '' )
         {
             $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         }
         else
         {
             $iv = $this->iv;
         }
         $ks = mcrypt_enc_get_key_size($td);
         @mcrypt_generic_init($td, $key, $iv);
         $decrypted = mdecrypt_generic($td, $encrypted);
         mcrypt_generic_deinit($td);
         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 * $pad);
     }
     function PaddingPKCS7($data) {
         $block_size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);//3DES加密将MCRYPT_DES改为MCRYPT_3DES
         $padding_char = $block_size - (strlen($data) % $block_size);
         $data .= str_repeat(chr($padding_char),$padding_char);
         return $data;
     }
}
$des = new CryptDes("12345678","12345678");//（秘钥向量，混淆向量）
echo $ret = $des->encrypt("1111");//加密字符串
?>