SOLVED.module

function encryptData($data) {

  $plainText = json_encode($data);
  $bytesToBeEncrypted = $plainText;

  $passwordBytes = utf8_encode("p@SSword");
  $passwordBytes = hash('sha256', $passwordBytes, true);

  $saltBytes = array(1,2,3,4,5,6,7,8);
  $saltBytesstring = "";
  for($i=0;$i<count($saltBytes);$i++){
      $saltBytesstring = $saltBytesstring.chr($saltBytes[$i]);
  }

  $hash = hash_pbkdf2("sha1", $passwordBytes, $saltBytesstring, 1000, 48, true);

  $keyHash = substr($hash, 0, 32);
  $ivHash = substr($hash, 32, 16);

  $method = 'AES-256-CBC';

  $encrypted = replaceCharacters(base64_encode(openssl_encrypt($bytesToBeEncrypted, $method, $keyHash, OPENSSL_RAW_DATA, $ivHash)));

  return $encrypted;
}