Examples with OtrOutputStream net.java.otr4j.io.OtrOutputStream used on opensource projects

Example 1 with OtrOutputStream

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

the class OtrSm method computeSessionId.

/* Compute secret session ID as hash of agreed secret */
private static byte[] computeSessionId(BigInteger s) throws SMException {
    byte[] sdata;
    try {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        OtrOutputStream oos = new OtrOutputStream(out);
        oos.write(0x00);
        oos.writeBigInt(s);
        sdata = out.toByteArray();
        oos.close();
    } catch (IOException e1) {
        throw new SMException(e1);
    }
    /* Calculate the session id */
    MessageDigest sha256;
    try {
        sha256 = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
        throw new SMException("cannot find SHA-256");
    }
    byte[] res = sha256.digest(sdata);
    byte[] secure_session_id = new byte[8];
    System.arraycopy(res, 0, secure_session_id, 0, 8);
    return secure_session_id;
}

Example 2 with OtrOutputStream

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

the class SessionImpl method transformSending.

// Retransmit last sent message. Spec document does not mention where or
// when that should happen, must check libotr code.
public String transformSending(String msgText, List<TLV> tlvs) throws OtrException {
    switch(this.getSessionStatus()) {
        case PLAINTEXT:
            if (getSessionPolicy().getRequireEncryption()) {
                lastSentMessage = msgText;
                doTransmitLastMessage = true;
                this.startSession();
                return null;
            } else
                // specification.
                return msgText;
        case ENCRYPTED:
            this.lastSentMessage = msgText;
            if (DEBUG_ENABLED)
                Log.d(LOG_TAG, getSessionID().getLocalUserId() + " sends an encrypted message to " + getSessionID().getRemoteUserId() + " through " + getSessionID().getProtocolName() + ".");
            // Get encryption keys.
            SessionKeys encryptionKeys = this.getEncryptionSessionKeys();
            int senderKeyID = encryptionKeys.getLocalKeyID();
            int receipientKeyID = encryptionKeys.getRemoteKeyID();
            // Increment CTR.
            encryptionKeys.incrementSendingCtr();
            byte[] ctr = encryptionKeys.getSendingCtr();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            if (msgText != null && msgText.length() > 0)
                try {
                    out.write(msgText.getBytes("UTF8"));
                } catch (IOException e) {
                    throw new OtrException(e);
                }
            // Append tlvs
            if (tlvs != null && tlvs.size() > 0) {
                out.write((byte) 0x00);
                OtrOutputStream eoos = new OtrOutputStream(out);
                for (TLV tlv : tlvs) {
                    try {
                        eoos.writeShort(tlv.type);
                        eoos.writeTlvData(tlv.value);
                        eoos.close();
                    } catch (IOException e) {
                        throw new OtrException(e);
                    }
                }
            }
            OtrCryptoEngine otrCryptoEngine = new OtrCryptoEngineImpl();
            byte[] data = out.toByteArray();
            // Encrypt message.
            if (DEBUG_ENABLED)
                Log.d(LOG_TAG, "Encrypting message with keyids (localKeyID, remoteKeyID) = (" + senderKeyID + ", " + receipientKeyID + ")");
            byte[] encryptedMsg = otrCryptoEngine.aesEncrypt(encryptionKeys.getSendingAESKey(), ctr, data);
            // Get most recent keys to get the next D-H public key.
            SessionKeys mostRecentKeys = this.getMostRecentSessionKeys();
            DHPublicKey nextDH = (DHPublicKey) mostRecentKeys.getLocalPair().getPublic();
            // Calculate T.
            MysteriousT t = new MysteriousT(2, 0, senderKeyID, receipientKeyID, nextDH, ctr, encryptedMsg);
            // Calculate T hash.
            byte[] sendingMACKey = encryptionKeys.getSendingMACKey();
            if (DEBUG_ENABLED)
                Log.d(LOG_TAG, "Transforming T to byte[] to calculate it's HmacSHA1.");
            byte[] serializedT;
            try {
                serializedT = SerializationUtils.toByteArray(t);
            } catch (IOException e) {
                throw new OtrException(e);
            }
            byte[] mac = otrCryptoEngine.sha1Hmac(serializedT, sendingMACKey, SerializationConstants.TYPE_LEN_MAC);
            // Get old MAC keys to be revealed.
            byte[] oldKeys = this.collectOldMacKeys();
            DataMessage m = new DataMessage(t, mac, oldKeys);
            try {
                return SerializationUtils.toString(m);
            } catch (IOException e) {
                throw new OtrException(e);
            }
        case FINISHED:
            this.lastSentMessage = msgText;
            showError("Your message to " + sessionID.getRemoteUserId() + " was not sent.  Either end your private conversation, or restart it.");
            return null;
        default:
            if (DEBUG_ENABLED)
                Log.d(LOG_TAG, "Unknown message state, not processing.");
            return msgText;
    }
}

Example 3 with OtrOutputStream

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

the class IOTest method testIOShort.

public void testIOShort() throws Exception {
    int source = 10;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    OtrOutputStream oos = new OtrOutputStream(out);
    oos.writeShort(source);
    oos.close();
    byte[] converted = out.toByteArray();
    ByteArrayInputStream bin = new ByteArrayInputStream(converted);
    OtrInputStream ois = new OtrInputStream(bin);
    int result = ois.readShort();
    ois.close();
    assertEquals(source, result);
}

Example 4 with OtrOutputStream

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

the class IOTest method testIODHPublicKey.

public void testIODHPublicKey() throws Exception {
    KeyPair pair = new OtrCryptoEngineImpl().generateDHKeyPair();
    DHPublicKey source = (DHPublicKey) pair.getPublic();
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    OtrOutputStream oos = new OtrOutputStream(out);
    oos.writeDHPublicKey(source);
    oos.close();
    byte[] converted = out.toByteArray();
    ByteArrayInputStream bin = new ByteArrayInputStream(converted);
    OtrInputStream ois = new OtrInputStream(bin);
    DHPublicKey result = ois.readDHPublicKey();
    ois.close();
    assertTrue(source.getY().compareTo(result.getY()) == 0);
}

Example 5 with OtrOutputStream

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

the class IOTest method testIOData.

public void testIOData() throws Exception {
    byte[] source = new byte[] { 1, 1, 1, 1 };
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    OtrOutputStream oos = new OtrOutputStream(out);
    oos.writeData(source);
    oos.close();
    byte[] converted = out.toByteArray();
    ByteArrayInputStream bin = new ByteArrayInputStream(converted);
    OtrInputStream ois = new OtrInputStream(bin);
    byte[] result = ois.readData();
    ois.close();
    assertTrue(java.util.Arrays.equals(source, result));
}