ELC example - MegaDownloader

<?php
// Example of ELC server encode. For MegaDownloader and MegaUploader - http://megadownloaderapp.blogspot.com/


$key = "PutYourPasswordHere!!";
// Your password, put some random data here. Once chosen, do not change it!!

/*
$_POST["USER"] = "test";
$_POST["APIKEY"] = "test";
$_POST["OPERATION_TYPE"] = "E";
$_POST["DATA"] = "SHbWFsgPydjQL08l7BjtDubSqzClm4/1";
$_POST["OPERATION_TYPE"] = "D";
$_POST["DATA"] = "zLd5VbZvARy6s+Ml1a6gMgU/YDUQ7hoGJ9h0ip9nYgCos7vPKLp5YsHW7WoGXJ7k";
*/

try {

  // Check user, password, etc. Do whatever you want.
  if ($_POST["USER"] != "test" or $_POST["APIKEY"] != "test"){

    throw new Exception('Invalid user or password');

  } else {

    // Decrypt or encrypt data
    if ($_POST["OPERATION_TYPE"] == "D") {
       die('{"e": "", "d": "'.decrypt($_POST["DATA"],$key).'"}');
    } else if ($_POST["OPERATION_TYPE"] == "E") {
       die('{"e": "", "d": "'.encrypt($_POST["DATA"],$key).'"}');
    } else {
       throw new Exception('Invalid input OPERATION_TYPE');
    }

  }

} catch (Exception $e) {

 die('{"e": "'.$e->getMessage().'", "d": ""}');

}



// Encrypting AES-128
function encrypt($string) {
    $enc = "";
    $iv = mcrypt_create_iv(mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, 'cbc'),MCRYPT_DEV_URANDOM); // In Rijndael 128, the length will be always 16
    global $key;
    $enc = mcrypt_cbc (MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_ENCRYPT, $iv);
    $enc = $iv.$enc;

  return base64_encode($enc);
}

// Decrypting AES-128
function decrypt($string) {
    $dec = "";
    $string = trim(base64_decode($string));
    if (strlen($string) < 17) { // check we have at least 16 chars (the IV!)
    throw new Exception('Invalid input DATA');
    }
    $iv = substr($string, 0, 16);
    $string = substr($string, 16);
    global $key;
    $dec = mcrypt_cbc (MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_DECRYPT, $iv);
  return $dec;
}

 ?>