/**
* @param \Jose\Object\JWKInterface $private_key
* @param \Jose\Object\JWKInterface $public_key
*
* @throws \InvalidArgumentException
*
* @return int|string|void
*/
public function calculateAgreementKey(JWKInterface $private_key, JWKInterface $public_key)
{
switch ($public_key->get('crv')) {
case 'P-256':
case 'P-384':
case 'P-521':
$p = $this->getGenerator($private_key);
$rec_x = $this->convertBase64ToGmp($public_key->get('x'));
$rec_y = $this->convertBase64ToGmp($public_key->get('y'));
$sen_d = $this->convertBase64ToGmp($private_key->get('d'));
$priv_key = $p->getPrivateKeyFrom($sen_d);
$pub_key = $p->getPublicKeyFrom($rec_x, $rec_y);
$ecdh = new EcDH(EccFactory::getAdapter());
$ecdh->setSenderKey($priv_key);
$ecdh->setRecipientKey($pub_key);
return $this->convertDecToBin($ecdh->calculateSharedKey());
case 'X25519':
return curve25519_shared(Base64Url::decode($private_key->get('d')), Base64Url::decode($public_key->get('x')));
default:
throw new \InvalidArgumentException(sprintf('The curve "%s" is not supported', $public_key->get('crv')));
}
}
/**
* {@inheritDoc}
* @see \Mdanter\Ecc\Crypto\Key\PrivateKeyInterface::createExchange()
*/
public function createExchange(MessageFactory $messageFactory, PublicKeyInterface $recipient = null)
{
$exchange = new EcDH($this->adapter, $messageFactory);
$exchange->setSenderKey($this);
$exchange->setRecipientKey($recipient);
return $exchange;
}
