PHP完全AES復号アルゴリズム使用及び例(256ビット)

PHP自身に依存するmcrypt拡張
 

<?php

class aes {

 

    // CRYPTO_CIPHER_BLOCK_SIZE 32

     

    private $_secret_key = 'default_secret_key';

     

    public function setKey($key) {

        $this->_secret_key = $key;

    }

     

    public function encode($data) {

        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256,'',MCRYPT_MODE_CBC,'');

        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);

        mcrypt_generic_init($td,$this->_secret_key,$iv);

        $encrypted = mcrypt_generic($td,$data);

        mcrypt_generic_deinit($td);

         

        return $iv . $encrypted;

    }

     

    public function decode($data) {

        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256,'',MCRYPT_MODE_CBC,'');

        $iv = mb_substr($data,0,32,'latin1');

        mcrypt_generic_init($td,$this->_secret_key,$iv);

        $data = mb_substr($data,32,mb_strlen($data,'latin1'),'latin1');

        $data = mdecrypt_generic($td,$data);

        mcrypt_generic_deinit($td);

        mcrypt_module_close($td);

         

        return trim($data);

    }

}

 

$aes = new aes();

$aes->setKey('key');

 

//   

$string = $aes->encode('string');

//   

$aes->decode($string);

?>