Examples with ResponseDoDH im.actor.core.network.mtp.entity.ResponseDoDH used on opensource projects

Example 1 with ResponseDoDH

use of im.actor.core.network.mtp.entity.ResponseDoDH in project actor-platform by actorapp.

the class AuthKeyActor method gotoDHState.

private void gotoDHState(final long keyId, final byte[] key, final byte[] serverNonce) {
    final byte[] clientNonce = new byte[32];
    Crypto.nextBytes(clientNonce);
    byte[] keyMaterial = new byte[32];
    Crypto.nextBytes(keyMaterial);
    final Curve25519KeyPair clientKeyPair = Curve25519.keyGen(keyMaterial);
    goToState(new ActorState() {

        @Override
        public ProtoStruct sendStartMessage() throws IOException {
            Log.d(TAG, "Sending RequestDH");
            return new RequestDH(randomId, keyId, clientNonce, clientKeyPair.getPublicKey());
        }

        @Override
        public void onMessage(ProtoStruct struct) throws IOException {
            if (struct instanceof ResponseDoDH) {
                Log.d(TAG, "Received ResponseDoDH");
                ResponseDoDH r = (ResponseDoDH) struct;
                if (r.getRandomId() != randomId) {
                    throw new IOException("Incorrect RandomId");
                }
                PRF combinedPrf = Cryptos.PRF_SHA_STREEBOG_256();
                byte[] nonce = ByteStrings.merge(clientNonce, serverNonce);
                byte[] pre_master_secret = Curve25519.calculateAgreement(clientKeyPair.getPrivateKey(), key);
                byte[] master_secret = combinedPrf.calculate(pre_master_secret, "master secret", nonce, 256);
                byte[] verify = combinedPrf.calculate(master_secret, "client finished", nonce, 256);
                if (!Curve25519.verifySignature(key, verify, r.getVerifySign())) {
                    throw new IOException("Incorrect Signature");
                }
                Digest sha256 = Crypto.createSHA256();
                sha256.update(master_secret, 0, master_secret.length);
                byte[] authIdHash = new byte[32];
                sha256.doFinal(authIdHash, 0);
                long authId = ByteStrings.bytesToLong(authIdHash);
                Log.d(TAG, "Key successfully created #" + authId);
                gotoSuccess(master_secret, authId);
            } else {
                throw new IOException("Expected: ResponseGetServerKey, got: " + struct.getClass().getName());
            }
        }
    });
}