Examples with RC4Engine org.gudy.bouncycastle.crypto.engines.RC4Engine used on opensource projects

Example 1 with RC4Engine

use of org.gudy.bouncycastle.crypto.engines.RC4Engine in project BiglyBT by BiglySoftware.

the class CryptoManagerImpl method obfuscate.

@Override
public byte[] obfuscate(byte[] data) {
    RC4Engine engine = new RC4Engine();
    CipherParameters params = new KeyParameter(new SHA1Simple().calculateHash(getOBSID()));
    engine.init(true, params);
    byte[] temp = new byte[1024];
    engine.processBytes(temp, 0, 1024, temp, 0);
    final byte[] obs_value = new byte[data.length];
    engine.processBytes(data, 0, data.length, obs_value, 0);
    return (obs_value);
}

Example 2 with RC4Engine

use of org.gudy.bouncycastle.crypto.engines.RC4Engine in project BiglyBT by BiglySoftware.

the class UDPConnectionSet method getCipher.

private RC4Engine getCipher(byte[] key) {
    SecretKeySpec secret_key_spec = new SecretKeySpec(key, "RC4");
    RC4Engine rc4_engine = new RC4Engine();
    CipherParameters params_a = new KeyParameter(secret_key_spec.getEncoded());
    // for RC4 enc/dec is irrelevant
    rc4_engine.init(true, params_a);
    // skip first 1024 bytes of stream to protected against a Fluhrer, Mantin and Shamir attack
    byte[] temp = new byte[1024];
    rc4_engine.processBytes(temp, 0, temp.length, temp, 0);
    return (rc4_engine);
}

Example 3 with RC4Engine

use of org.gudy.bouncycastle.crypto.engines.RC4Engine in project BiglyBT by BiglySoftware.

the class UDPConnectionSet method setSecret.

protected void setSecret(UDPConnection connection, byte[] session_secret) {
    try {
        if (connection == lead_connection) {
            if (manager.trace()) {
                trace("crypto done");
            }
            SHA1Hasher hasher = new SHA1Hasher();
            hasher.update(KEYA_IV);
            hasher.update(session_secret);
            byte[] a_key = hasher.getDigest();
            hasher = new SHA1Hasher();
            hasher.update(KEYB_IV);
            hasher.update(session_secret);
            byte[] b_key = hasher.getDigest();
            hasher = new SHA1Hasher();
            hasher.update(KEYC_IV);
            hasher.update(session_secret);
            byte[] c_key = hasher.getDigest();
            hasher = new SHA1Hasher();
            hasher.update(KEYD_IV);
            hasher.update(session_secret);
            byte[] d_key = hasher.getDigest();
            // for RC4 enc/dec is irrelevant
            RC4Engine rc4_engine_a = getCipher(a_key);
            RC4Engine rc4_engine_b = getCipher(b_key);
            RC4Engine rc4_engine_c = getCipher(c_key);
            RC4Engine rc4_engine_d = getCipher(d_key);
            if (lead_connection.isIncoming()) {
                header_cipher_out = rc4_engine_a;
                header_cipher_in = rc4_engine_b;
                out_seq_generator = new SequenceGenerator(new Random(bytesToLong(d_key)), rc4_engine_c, false);
                in_seq_generator = new SequenceGenerator(new Random(bytesToLong(c_key)), rc4_engine_d, true);
                random = new Random(bytesToLong(d_key, 8));
            } else {
                header_cipher_out = rc4_engine_b;
                header_cipher_in = rc4_engine_a;
                in_seq_generator = new SequenceGenerator(new Random(bytesToLong(d_key)), rc4_engine_c, true);
                out_seq_generator = new SequenceGenerator(new Random(bytesToLong(c_key)), rc4_engine_d, false);
                random = new Random(bytesToLong(c_key, 8));
            }
            // as the first packet each way is crypto we skip a sequence number from each generator
            // to represent this and initialise the last-in-order seq appropriately so a sensible value is
            // spliced into the next packet
            out_seq_generator.getNextSequenceNumber();
            int[] initial_in_seqs = in_seq_generator.getNextSequenceNumber();
            receive_last_inorder_alt_sequence = initial_in_seqs[3];
            crypto_done = true;
        } else if (!crypto_done) {
            Debug.out("Secondary setSecret but crypto not done");
        }
    } catch (Throwable e) {
        Debug.printStackTrace(e);
        connection.close("Crypto problems: " + Debug.getNestedExceptionMessage(e));
    }
}

Example 4 with RC4Engine

use of org.gudy.bouncycastle.crypto.engines.RC4Engine in project BiglyBT by BiglySoftware.

the class DHTControlImpl method getObfuscatedValue.

protected byte[] getObfuscatedValue(byte[] plain_key) {
    RC4Engine engine = new RC4Engine();
    CipherParameters params = new KeyParameter(new SHA1Simple().calculateHash(plain_key));
    engine.init(true, params);
    byte[] temp = new byte[1024];
    engine.processBytes(temp, 0, 1024, temp, 0);
    final byte[] obs_value = new byte[plain_key.length];
    engine.processBytes(plain_key, 0, plain_key.length, obs_value, 0);
    return (obs_value);
}