Examples with SessionKey net.i2p.data.SessionKey used on opensource projects

Example 41 with SessionKey

use of net.i2p.data.SessionKey in project i2p.i2p by i2p.

the class DatabaseLookupMessage method readMessage.

public void readMessage(byte[] data, int offset, int dataSize, int type) throws I2NPMessageException {
    if (type != MESSAGE_TYPE)
        throw new I2NPMessageException("Message type is incorrect for this message");
    int curIndex = offset;
    // byte keyData[] = new byte[Hash.HASH_LENGTH];
    // System.arraycopy(data, curIndex, keyData, 0, Hash.HASH_LENGTH);
    _key = Hash.create(data, curIndex);
    curIndex += Hash.HASH_LENGTH;
    // _key = new Hash(keyData);
    // byte fromData[] = new byte[Hash.HASH_LENGTH];
    // System.arraycopy(data, curIndex, fromData, 0, Hash.HASH_LENGTH);
    _fromHash = Hash.create(data, curIndex);
    curIndex += Hash.HASH_LENGTH;
    // _fromHash = new Hash(fromData);
    // as of 0.9.6, ignore other 7 bits of the flag byte
    // TODO store the whole flag byte
    boolean tunnelSpecified = (data[curIndex] & FLAG_TUNNEL) != 0;
    boolean replyKeySpecified = (data[curIndex] & FLAG_ENCRYPT) != 0;
    switch(data[curIndex] & FLAG_TYPE_MASK) {
        case FLAG_TYPE_LS:
            _type = Type.LS;
            break;
        case FLAG_TYPE_RI:
            _type = Type.RI;
            break;
        case FLAG_TYPE_EXPL:
            _type = Type.EXPL;
            break;
        case FLAG_TYPE_ANY:
        default:
            _type = Type.ANY;
            break;
    }
    curIndex++;
    if (tunnelSpecified) {
        _replyTunnel = new TunnelId(DataHelper.fromLong(data, curIndex, 4));
        curIndex += 4;
    }
    int numPeers = (int) DataHelper.fromLong(data, curIndex, 2);
    curIndex += 2;
    if ((numPeers < 0) || (numPeers > MAX_NUM_PEERS))
        throw new I2NPMessageException("Invalid number of peers - " + numPeers);
    List<Hash> peers = numPeers > 0 ? new ArrayList<Hash>(numPeers) : null;
    for (int i = 0; i < numPeers; i++) {
        // byte peer[] = new byte[Hash.HASH_LENGTH];
        // System.arraycopy(data, curIndex, peer, 0, Hash.HASH_LENGTH);
        Hash p = Hash.create(data, curIndex);
        curIndex += Hash.HASH_LENGTH;
        peers.add(p);
    }
    _dontIncludePeers = peers;
    if (replyKeySpecified) {
        byte[] rk = new byte[SessionKey.KEYSIZE_BYTES];
        System.arraycopy(data, curIndex, rk, 0, SessionKey.KEYSIZE_BYTES);
        _replyKey = new SessionKey(rk);
        curIndex += SessionKey.KEYSIZE_BYTES;
        // number of tags, assume always 1 for now
        curIndex++;
        byte[] rt = new byte[SessionTag.BYTE_LENGTH];
        System.arraycopy(data, curIndex, rt, 0, SessionTag.BYTE_LENGTH);
        _replyTag = new SessionTag(rt);
    }
}

Example 42 with SessionKey

use of net.i2p.data.SessionKey in project i2p.i2p by i2p.

the class DHSessionKeyBuilder method calculateSessionKey.

/**
 * Calculate a session key based on the private value and the public peer value.
 *
 * This is the first 32 bytes of the exchanged key (nominally 256 bytes),
 * EXCEPT that the first byte will be zero if the most significant bit was a 1
 * (Java BigInteger.toByteArray() format)
 *
 * Side effect - sets extraExchangedBytes to the next 32 bytes.
 */
private final SessionKey calculateSessionKey(BigInteger myPrivateValue, BigInteger publicPeerValue) {
    long start = System.currentTimeMillis();
    SessionKey key = new SessionKey();
    BigInteger exchangedKey = publicPeerValue.modPow(myPrivateValue, CryptoConstants.elgp);
    // surprise! leading zero byte half the time!
    // probably was a mistake, too late now...
    byte[] buf = exchangedKey.toByteArray();
    byte[] val = new byte[SessionKey.KEYSIZE_BYTES];
    if (buf.length < 2 * SessionKey.KEYSIZE_BYTES) {
        // UDP requires at least 32 bytes in _extraExchangedBytes for the mac key
        // Won't ever happen, typ buf is 256 or 257 bytes
        System.arraycopy(buf, 0, val, 0, Math.min(buf.length, SessionKey.KEYSIZE_BYTES));
        // == Hash.HASH_LENGTH
        byte[] remaining = new byte[SessionKey.KEYSIZE_BYTES];
        // non-caching version
        SHA256Generator.getInstance().calculateHash(buf, 0, buf.length, remaining, 0);
        _extraExchangedBytes.setData(remaining);
    // if (_log.shouldLog(Log.DEBUG))
    // _log.debug("Storing " + remaining.length + " bytes from the DH exchange by SHA256 the session key");
    } else {
        // Will always be here, typ buf is 256 or 257 bytes
        System.arraycopy(buf, 0, val, 0, SessionKey.KEYSIZE_BYTES);
        // feed the extra bytes into the PRNG
        RandomSource.getInstance().harvester().feedEntropy("DH", buf, val.length, buf.length - val.length);
        byte[] remaining = new byte[buf.length - val.length];
        System.arraycopy(buf, val.length, remaining, 0, remaining.length);
        _extraExchangedBytes.setData(remaining);
    // if (_log.shouldLog(Log.DEBUG))
    // _log.debug("Storing " + remaining.length + " bytes from the end of the DH exchange");
    }
    key.setData(val);
    long end = System.currentTimeMillis();
    long diff = end - start;
    I2PAppContext.getGlobalContext().statManager().addRateData("crypto.dhCalculateSessionTime", diff);
    // }
    return key;
}

Example 43 with SessionKey

use of net.i2p.data.SessionKey in project i2p.i2p by i2p.

the class ConfigKeyringHelper method render.

/**
 *  @since 0.9.33 moved from PersistentKeyRing
 */
private void render(StringBuilder buf, boolean local) {
    buf.append("\n<table class=\"configtable\"><tr><th align=\"left\">").append(_t("Destination")).append("<th align=\"left\">").append(_t("Name")).append("<th align=\"left\">").append(_t("Encryption Key")).append("</tr>");
    for (Map.Entry<Hash, SessionKey> e : _context.keyRing().entrySet()) {
        Hash h = e.getKey();
        if (local != _context.clientManager().isLocal(h))
            continue;
        buf.append("\n<tr><td>");
        buf.append(h.toBase32());
        buf.append("</td><td>");
        Destination dest = _context.netDb().lookupDestinationLocally(h);
        if (dest != null && local) {
            TunnelPoolSettings in = _context.tunnelManager().getInboundSettings(h);
            if (in != null && in.getDestinationNickname() != null)
                buf.append(in.getDestinationNickname());
        } else {
            String host = _context.namingService().reverseLookup(h);
            if (host != null)
                buf.append(host);
        }
        buf.append("</td><td>");
        SessionKey sk = e.getValue();
        buf.append(sk.toBase64());
        buf.append("</td>\n");
    }
    buf.append("</table>\n");
}

Example 44 with SessionKey

use of net.i2p.data.SessionKey in project i2p.i2p by i2p.

the class ElGamalTest method testAES.

public void testAES() {
    SessionKey sessionKey = KeyGenerator.getInstance().generateSessionKey();
    Hash h = SHA256Generator.getInstance().calculateHash(sessionKey.getData());
    byte[] iv = new byte[16];
    System.arraycopy(h.getData(), 0, iv, 0, 16);
    String msg = "Hello world";
    byte[] encrypted = _context.elGamalAESEngine().encryptAESBlock(DataHelper.getASCII(msg), sessionKey, iv, null, null, 64);
    Set<SessionTag> foundTags = new HashSet<SessionTag>();
    SessionKey foundKey = new SessionKey();
    byte[] decrypted = null;
    try {
        decrypted = _context.elGamalAESEngine().decryptAESBlock(encrypted, 0, encrypted.length, sessionKey, iv, null, foundTags, foundKey);
    } catch (DataFormatException dfe) {
        dfe.printStackTrace();
        fail();
    }
    assertNotNull(decrypted);
    String read = new String(decrypted);
    assertEquals(msg, read);
}

Example 45 with SessionKey

use of net.i2p.data.SessionKey in project i2p.i2p by i2p.

the class ElGamalTest method testElGamal.

public void testElGamal() {
    for (int i = 0; i < 2; i++) {
        Object[] keys = KeyGenerator.getInstance().generatePKIKeypair();
        PublicKey pubKey = (PublicKey) keys[0];
        PrivateKey privKey = (PrivateKey) keys[1];
        SessionKey key = KeyGenerator.getInstance().generateSessionKey();
        ByteArrayOutputStream elgSrc = new ByteArrayOutputStream(256);
        try {
            key.writeBytes(elgSrc);
        } catch (DataFormatException dfe) {
            dfe.printStackTrace();
            fail();
        } catch (IOException ioe) {
            ioe.printStackTrace();
            fail();
        }
        byte[] preIV = new byte[32];
        RandomSource.getInstance().nextBytes(preIV);
        try {
            elgSrc.write(preIV);
            elgSrc.flush();
        } catch (IOException ioe) {
            ioe.printStackTrace();
            fail();
        }
        byte[] elgEncr = _context.elGamalEngine().encrypt(elgSrc.toByteArray(), pubKey);
        byte[] elgDecr = _context.elGamalEngine().decrypt(elgEncr, privKey);
        ByteArrayInputStream bais = new ByteArrayInputStream(elgDecr);
        SessionKey nk = new SessionKey();
        try {
            nk.readBytes(bais);
        } catch (DataFormatException dfe) {
            dfe.printStackTrace();
            fail();
        } catch (IOException ioe) {
            ioe.printStackTrace();
            fail();
        }
        byte[] postpreIV = new byte[32];
        int read = 0;
        try {
            read = bais.read(postpreIV);
        } catch (IOException ioe) {
            ioe.printStackTrace();
            fail();
        }
        assertEquals(read, postpreIV.length);
        assertTrue(DataHelper.eq(preIV, postpreIV));
        assertEquals(key, nk);
    }
}