<?php
class aesLanhai{}

/**
 * 使用旧的mcrypt来写，澜海加解密类
 */
class Security {

    private $key;

    public function __construct() {
        $CI =& get_instance();
        $CI->load->config();
        $this->key = LANHAI_KEY;
        //$this->key = "999c1DtJJ4pEbcxeEqJBKw==";
    }

 
    public  function encryptData($input) {
        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $input = Security::pkcs5_pad($input, $size);
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $this->key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $data = base64_encode($data);
        return $data;

    }

    private static function pkcs5_pad ($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }

    public  function decryptData($sStr) {
        $decrypted= mcrypt_decrypt(
            MCRYPT_RIJNDAEL_128,
            $this->key,
            base64_decode($sStr),
            MCRYPT_MODE_ECB
        );
        $dec_s = strlen($decrypted);
        $padding = ord($decrypted[$dec_s-1]);
        $decrypted = substr($decrypted, 0, -$padding);
        return $decrypted;
    }  

}
