public function sendSetPreKeys($new = false)
{
$axolotl = new KeyHelper();
$identityKeyPair = $axolotl->generateIdentityKeyPair();
$privateKey = $identityKeyPair->getPrivateKey()->serialize();
$publicKey = $identityKeyPair->getPublicKey()->serialize();
$keys = $axolotl->generatePreKeys(mt_rand(), 200);
$this->axolotlStore->storePreKeys($keys);
for ($i = 0; $i < 200; $i++) {
$prekeyId = adjustId($keys[$i]->getId());
$prekey = substr($keys[$i]->getKeyPair()->getPublicKey()->serialize(), 1);
$id = new ProtocolNode('id', null, null, $prekeyId);
$value = new ProtocolNode('value', null, null, $prekey);
$prekeys[] = new ProtocolNode('key', null, array($id, $value), null);
// 200 PreKeys
}
if ($new) {
$registrationId = $this->axolotlStore->getLocalRegistrationId();
} else {
$registrationId = $axolotl->generateRegistrationId();
}
$registration = new ProtocolNode('registration', null, null, adjustId($registrationId));
$identity = new ProtocolNode('identity', null, null, substr($publicKey, 1));
$type = new ProtocolNode('type', null, null, chr(Curve::DJB_TYPE));
$this->axolotlStore->storeLocalData($registrationId, $identityKeyPair);
$list = new ProtocolNode('list', null, $prekeys, null);
$signedRecord = $axolotl->generateSignedPreKey($identityKeyPair, $axolotl->getRandomSequence(65536));
$this->axolotlStore->storeSignedPreKey($signedRecord->getId(), $signedRecord);
$sid = new ProtocolNode('id', null, null, adjustId($signedRecord->getId()));
$value = new ProtocolNode('value', null, null, substr($signedRecord->getKeyPair()->getPublicKey()->serialize(), 1));
$signature = new ProtocolNode('signature', null, null, $signedRecord->getSignature());
$secretKey = new ProtocolNode('skey', null, array($sid, $value, $signature), null);
$iqId = $this->createIqId();
$iqNode = new ProtocolNode('iq', array("id" => $iqId, "to" => Constants::WHATSAPP_SERVER, "type" => "set", "xmlns" => "encrypt"), array($identity, $registration, $type, $list, $secretKey), null);
$this->sendNode($iqNode);
$this->waitForServer($iqId);
}
public function processInitKeyExchangeMessage()
{
try {
$sequence = KeyHelper::getRandomSequence(65534) + 1;
$flags = KeyExchangeMessage::INITIATE_FLAG;
$baseKey = Curve::generateKeyPair();
$ratchetKey = Curve::generateKeyPair();
$identityKey = $this->identityKeyStore->getIdentityKeyPair();
$baseKeySignature = Curve::calculateSignature($identityKey->getPrivateKey(), $baseKey->getPublicKey()->serialize());
$sessionRecord = $this->sessionStore->loadSession($this->recipientId, $this->deviceId);
$sessionRecord->getSessionState()->setPendingKeyExchange($sequence, $baseKey, $ratchetKey, $identityKey);
$this->sessionStore->storeSession($this->recipientId, $this->deviceId, $sessionRecord);
return new KeyExchangeMessage(2, $sequence, $flags, $baseKey->getPublicKey(), $baseKeySignature, $ratchetKey->getPublicKey(), $identityKey->getPublicKey());
} catch (InvalidKeyException $ex) {
throw new Exception($ex->getMessage());
}
}
