PHP DES加密解密封装类

浏览数：28 / 时间：2015年06月09日

<?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
?>