public static function generateSignedPreKey($identityKeyPair, $signedPreKeyId)
{
$keyPair = Curve::generateKeyPair();
$signature = Curve::calculateSignature($identityKeyPair->getPrivateKey(), $keyPair->getPublicKey()->serialize());
$spk = new SignedPreKeyRecord($signedPreKeyId, (int) round(time() * 1000), $keyPair, $signature);
return $spk;
}
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());
}
}
private function getSignature($signatureKey, $serialized)
{
try {
return Curve::calculateSignature($signatureKey, $serialized);
} catch (InvalidKeyException $ex) {
throw new Exception($ex->getMessage());
}
}
