/**
* Método que obtiene la clave asociada al módulo y exponente entregados
* @param modulus Módulo de la clave
* @param exponent Exponente de la clave
* @return Entrega la clave asociada al módulo y exponente
* @author Esteban De La Fuente Rubio, DeLaF (esteban[at]sasco.cl)
* @version 2015-09-19
*/
public static function getFromModulusExponent($modulus, $exponent)
{
$rsa = new \phpseclib\Crypt\RSA();
$modulus = new \phpseclib\Math\BigInteger(base64_decode($modulus), 256);
$exponent = new \phpseclib\Math\BigInteger(base64_decode($exponent), 256);
$rsa->loadKey(['n' => $modulus, 'e' => $exponent]);
$rsa->setPublicKey();
return $rsa->getPublicKey();
}
/**
* Make the Jason API call to the backend via http
*/
private function make_jason_http_request($data)
{
// use key 'http' even if you send the request to https://...
$options = array('http' => array('header' => "Content-type: application/json\r\n", 'method' => 'POST', 'content' => json_encode($data)));
$context = stream_context_create($options);
$result = file_get_contents(get_option('api_uri'), false, $context);
$keyArray = $this->get_key();
// extract the key
$modulus = $keyArray['keys'][0]['n'];
$exponent = $keyArray['keys'][0]['e'];
$rsa = new phpseclib\Crypt\RSA();
$modulus = new \phpseclib\Math\BigInteger(Firebase\JWT\JWT::urlsafeB64Decode($modulus), 256);
$exponent = new \phpseclib\Math\BigInteger(Firebase\JWT\JWT::urlsafeB64Decode($exponent), 256);
$rsa->load(array('n' => $modulus, 'e' => $exponent));
$rsa->setPublicKey();
$pubKey = $rsa->getPublicKey();
$decodedResult = $this->decode_jwt($result, $pubKey);
return array($decodedResult, $result);
}
<?php
include '../phpseclib/vendor/autoload.php';
$rsa = new \phpseclib\Crypt\RSA();
$public = file_get_contents('public.pem');
$rsa->load($public);
$rsa->setHash('sha512');
$rsa->setMGFHash('sha512');
echo 'n= ' . $rsa->modulus . PHP_EOL;
echo 'e= ' . $rsa->exponent . PHP_EOL;
echo 'Bits: ' . $rsa->getSize() . ' bits.' . '(' . strlen($rsa->modulus) . ')' . PHP_EOL;
echo PHP_EOL;
echo $rsa->getPublicKey('PKCS1') . PHP_EOL;
