Examples with SignatureM net.java.otr4j.io.messages.SignatureM used on opensource projects

Example 1 with SignatureM

use of net.java.otr4j.io.messages.SignatureM in project Zom-Android by zom.

the class AuthContextImpl method handleRevealSignatureMessage.

private void handleRevealSignatureMessage(RevealSignatureMessage m) throws OtrException {
    Session session = getSession();
    SessionID sessionID = session.getSessionID();
    logger.finest(sessionID.getLocalUserId() + " received a reveal signature message from " + sessionID.getRemoteUserId() + " throught " + sessionID.getProtocolName() + ".");
    if (!session.getSessionPolicy().getAllowV2()) {
        logger.finest("Policy does not allow OTRv2, ignoring message.");
        return;
    }
    switch(this.getAuthenticationState()) {
        case AWAITING_REVEALSIG:
            // Use the received value of r to decrypt the value of gx
            // received
            // in the D-H Commit Message, and verify the hash therein.
            // Decrypt
            // the encrypted signature, and verify the signature and the
            // MACs.
            // If everything checks out:
            // * Reply with a Signature Message.
            // * Transition authstate to AUTHSTATE_NONE.
            // * Transition msgstate to MSGSTATE_ENCRYPTED.
            // * TODO If there is a recent stored message, encrypt it and
            // send
            // it as a Data Message.
            OtrCryptoEngine otrCryptoEngine = new OtrCryptoEngineImpl();
            // Uses r to decrypt the value of gx sent earlier
            byte[] remoteDHPublicKeyDecrypted = otrCryptoEngine.aesDecrypt(m.revealedKey, null, this.getRemoteDHPublicKeyEncrypted());
            // Verifies that HASH(gx) matches the value sent earlier
            byte[] remoteDHPublicKeyHash = otrCryptoEngine.sha256Hash(remoteDHPublicKeyDecrypted);
            if (!Arrays.equals(remoteDHPublicKeyHash, this.getRemoteDHPublicKeyHash())) {
                logger.finest("Hashes don't match, ignoring message.");
                return;
            }
            // Verifies that Bob's gx is a legal value (2 <= gx <=
            // modulus-2)
            BigInteger remoteDHPublicKeyMpi;
            try {
                remoteDHPublicKeyMpi = SerializationUtils.readMpi(remoteDHPublicKeyDecrypted);
            } catch (IOException e) {
                throw new OtrException(e);
            }
            this.setRemoteDHPublicKey(otrCryptoEngine.getDHPublicKey(remoteDHPublicKeyMpi));
            // Verify received Data.
            if (!m.verify(this.getM2())) {
                logger.finest("Signature MACs are not equal, ignoring message.");
                return;
            }
            // Decrypt X.
            byte[] remoteXDecrypted = m.decrypt(this.getC());
            SignatureX remoteX;
            try {
                remoteX = SerializationUtils.toMysteriousX(remoteXDecrypted);
            } catch (IOException e) {
                throw new OtrException(e);
            }
            // Compute signature.
            PublicKey remoteLongTermPublicKey = remoteX.longTermPublicKey;
            SignatureM remoteM = new SignatureM(this.getRemoteDHPublicKey(), (DHPublicKey) this.getLocalDHKeyPair().getPublic(), remoteLongTermPublicKey, remoteX.dhKeyID);
            // Verify signature.
            byte[] signature;
            try {
                signature = otrCryptoEngine.sha256Hmac(SerializationUtils.toByteArray(remoteM), this.getM1());
            } catch (IOException e) {
                throw new OtrException(e);
            }
            if (!otrCryptoEngine.verify(signature, remoteLongTermPublicKey, remoteX.signature)) {
                session.showWarning("Bad revealed signature");
                logger.finest("Signature verification failed.");
                return;
            }
            logger.finest("Signature verification succeeded.");
            this.setAuthenticationState(AuthContext.NONE);
            this.setIsSecure(true);
            this.setRemoteLongTermPublicKey(remoteLongTermPublicKey);
            getSession().injectMessage(messageFactory.getSignatureMessage());
            break;
        default:
            logger.finest("Ignoring message.");
            break;
    }
}

Example 2 with SignatureM

use of net.java.otr4j.io.messages.SignatureM in project Zom-Android by zom.

the class AuthContextImpl method handleSignatureMessage.

private void handleSignatureMessage(SignatureMessage m) throws OtrException {
    Session session = getSession();
    SessionID sessionID = session.getSessionID();
    logger.finest(sessionID.getLocalUserId() + " received a signature message from " + sessionID.getRemoteUserId() + " throught " + sessionID.getProtocolName() + ".");
    if (!session.getSessionPolicy().getAllowV2()) {
        logger.finest("Policy does not allow OTRv2, ignoring message.");
        return;
    }
    switch(this.getAuthenticationState()) {
        case AWAITING_SIG:
            // Verify MAC.
            if (!m.verify(this.getM2p())) {
                logger.finest("Signature MACs are not equal, ignoring message.");
                return;
            }
            // Decrypt X.
            byte[] remoteXDecrypted = m.decrypt(this.getCp());
            SignatureX remoteX;
            try {
                remoteX = SerializationUtils.toMysteriousX(remoteXDecrypted);
            } catch (IOException e) {
                throw new OtrException(e);
            }
            // Compute signature.
            PublicKey remoteLongTermPublicKey = remoteX.longTermPublicKey;
            SignatureM remoteM = new SignatureM(this.getRemoteDHPublicKey(), (DHPublicKey) this.getLocalDHKeyPair().getPublic(), remoteLongTermPublicKey, remoteX.dhKeyID);
            OtrCryptoEngine otrCryptoEngine = new OtrCryptoEngineImpl();
            // Verify signature.
            byte[] signature;
            try {
                signature = otrCryptoEngine.sha256Hmac(SerializationUtils.toByteArray(remoteM), this.getM1p());
            } catch (IOException e) {
                throw new OtrException(e);
            }
            if (!otrCryptoEngine.verify(signature, remoteLongTermPublicKey, remoteX.signature)) {
                session.showWarning("Bad signature");
                logger.finest("Signature verification failed.");
                return;
            }
            this.setIsSecure(true);
            this.setRemoteLongTermPublicKey(remoteLongTermPublicKey);
            break;
        default:
            logger.finest("We were not expecting a signature, ignoring message.");
            return;
    }
}