public function InMemoryIdentityKeyStore()
{
$this->trustedKeys = [];
$identityKeyPairKeys = Curve::generateKeyPair();
$this->identityKeyPair = new IdentityKeyPair(new IdentityKey($identityKeyPairKeys->getPublicKey()), $identityKeyPairKeys->getPrivateKey());
$this->localRegistrationId = KeyHelper::generateRegistrationId();
}
public function getOrCreateChainKey($sessionState, $ECPublicKey_theirEphemeral)
{
$theirEphemeral = $ECPublicKey_theirEphemeral;
if ($sessionState->hasReceiverChain($theirEphemeral)) {
return $sessionState->getReceiverChainKey($theirEphemeral);
} else {
$rootKey = $sessionState->getRootKey();
$ourEphemeral = $sessionState->getSenderRatchetKeyPair();
$receiverChain = $rootKey->createChain($theirEphemeral, $ourEphemeral);
$ourNewEphemeral = Curve::generateKeyPair();
$senderChain = $receiverChain[0]->createChain($theirEphemeral, $ourNewEphemeral);
$sessionState->setRootKey($senderChain[0]);
$sessionState->addReceiverChain($theirEphemeral, $receiverChain[1]);
$sessionState->setPreviousCounter(max($sessionState->getSenderChainKey()->getIndex() - 1, 0));
$sessionState->setSenderChain($ourNewEphemeral, $senderChain[1]);
return $receiverChain[1];
}
}
public static function generateSenderSigningKey()
{
return Curve::generateKeyPair();
}
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());
}
}
protected function initializeSessionsV3($aliceSessionState, $bobSessionState)
{
$aliceIdentityKeyPair = Curve::generateKeyPair();
$aliceIdentityKey = new IdentityKeyPair(new IdentityKey($aliceIdentityKeyPair->getPublicKey()), $aliceIdentityKeyPair->getPrivateKey());
$aliceBaseKey = Curve::generateKeyPair();
$aliceEphemeralKey = Curve::generateKeyPair();
$alicePreKey = $aliceBaseKey;
$bobIdentityKeyPair = Curve::generateKeyPair();
$bobIdentityKey = new IdentityKeyPair(new IdentityKey($bobIdentityKeyPair->getPublicKey()), $bobIdentityKeyPair->getPrivateKey());
$bobBaseKey = Curve::generateKeyPair();
$bobEphemeralKey = $bobBaseKey;
$bobPreKey = Curve::generateKeyPair();
$aliceParameters = AliceAxolotlParameters::newBuilder()->setOurBaseKey($aliceBaseKey)->setOurIdentityKey($aliceIdentityKey)->setTheirOneTimePreKey(null)->setTheirRatchetKey($bobEphemeralKey->getPublicKey())->setTheirSignedPreKey($bobBaseKey->getPublicKey())->setTheirIdentityKey($bobIdentityKey->getPublicKey())->create();
$bobParameters = BobAxolotlParameters::newBuilder()->setOurRatchetKey($bobEphemeralKey)->setOurSignedPreKey($bobBaseKey)->setOurOneTimePreKey(null)->setOurIdentityKey($bobIdentityKey)->setTheirIdentityKey($aliceIdentityKey->getPublicKey())->setTheirBaseKey($aliceBaseKey->getPublicKey())->create();
RatchetingSession::initializeSessionAsAlice($aliceSessionState, 3, $aliceParameters);
RatchetingSession::initializeSessionAsBob($bobSessionState, 3, $bobParameters);
}
