<?php

require __DIR__ . '/vendor/autoload.php';

  use phpseclib\Crypt\RSA;

  function rsaEncryptionOaepSha256 ($publicKey, $plaintext) {
    $rsa = new RSA;
    $rsa->loadKey($publicKey);
    $rsa->setHash('sha256');
    $rsa->setMGFHash('sha256');
    return $rsa->encrypt($plaintext);
  }

  function rsaDecryptionOaepSha256 ($privateKey, $ciphertext) {
    $rsa = new RSA;
    $rsa->loadKey($privateKey);
    $rsa->setHash('sha256');
    $rsa->setMGFHash('sha256');
    return $rsa->decrypt($ciphertext);
  }