php与java通用AES加密解密算法, php类

浏览数：30 / 时间：2015年06月08日

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class CryptAES{
    protected 
$cipher = MCRYPT_RIJNDAEL_128;
    protected 
$mode = MCRYPT_MODE_ECB;
    protected 
$pad_method = NULL;
    protected 
$secret_key = ‘‘;
    protected 
$iv = ‘‘;
  
    public 
function set_cipher($cipher){
        $this->cipher = $cipher;
    }
  
    public 
function set_mode($mode){
        $this->mode = $mode;
    }
  
    public 
function set_iv($iv){
        $this->iv = $iv;
    }
  
    public 
function set_key($key){
        $this->secret_key = $key;
    }
  
    public 
function require_pkcs5(){
        $this->pad_method = ‘pkcs5‘;
    }
  
    protected 
function pad_or_unpad($str, $ext){
        if 
( is_null($this->pad_method) ){
            return 
$str;
        }else{
            $func_name 
= __CLASS__ 
. ‘::‘ . $this->pad_method . ‘_‘ 
. $ext . ‘pad‘;
            if 
( is_callable($func_name) ){
                $size 
= mcrypt_get_block_size($this->cipher, $this->mode);
                return 
call_user_func($func_name, $str, $size);
            }
        }
        return 
$str;
    }
  
    protected 
function pad($str){
        return 
$this->pad_or_unpad($str, ‘‘);
    }
  
    protected 
function unpad($str){
        return 
$this->pad_or_unpad($str, ‘un‘);
    }
  
    public 
function encrypt($str){
        $str 
= $this->pad($str);
        $td 
= mcrypt_module_open($this->cipher, ‘‘, $this->mode, ‘‘);
  
        if 
( empty($this->iv) ){
            $iv 
= @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }else{
            $iv 
= $this->iv;
        }
  
        mcrypt_generic_init($td, $this->secret_key, $iv);
        $cyper_text 
= mcrypt_generic($td, $str);
        $rt=base64_encode($cyper_text);
        //$rt = bin2hex($cyper_text);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
  
        return 
$rt;
    }
  
    public 
function decrypt($str){
        $td 
= mcrypt_module_open($this->cipher, ‘‘, $this->mode, ‘‘);
  
        if 
( empty($this->iv) ){
            $iv 
= @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }else{
            $iv 
= $this->iv;
        }
  
        mcrypt_generic_init($td, $this->secret_key, $iv);
        //$decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
        $decrypted_text 
= mdecrypt_generic($td, base64_decode($str));
        $rt 
= $decrypted_text;
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
  
        return 
$this->unpad($rt);
    }
  
    public 
static function hex2bin($hexdata) {
        $bindata 
= ‘‘;
        $length 
= strlen($hexdata);
        for 
($i=0; $i 
< $length; $i 
+= 2){
            $bindata 
.= chr(hexdec(substr($hexdata, $i, 2)));
        }
        return 
$bindata;
    }
  
    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);
    }
}