Handshakes

[DrBrad]

It appears you are not handling the handshake correctly.

Below is the correct method.
You are not verifying that the received handshake client sends s1 is correct and you are not sending back c1...

`

public static final int HANDSHAKE_LENGTH = 1536, VERSION_LENGTH = 1;

public static boolean startHandshake(InputStream in, OutputStream out)throws IOException {
    if(in.available() < HANDSHAKE_LENGTH+VERSION_LENGTH){
        return false;
    }

    in.read();

    //C0&1
    byte[] clientHandshake = new byte[HANDSHAKE_LENGTH];
    in.read(clientHandshake);

    //S0&1
    byte[] serverHandshake = new byte[HANDSHAKE_LENGTH];
    serverHandshake[0] = ((byte) (0xff & (0 >> 24)));
    serverHandshake[1] = ((byte) (0xff & (0 >> 16)));
    serverHandshake[2] = ((byte) (0xff & (0 >> 8)));
    serverHandshake[3] = ((byte) (0xff & 0));

    serverHandshake[4] = ((byte) (0xff & (0 >> 24)));
    serverHandshake[5] = ((byte) (0xff & (0 >> 16)));
    serverHandshake[6] = ((byte) (0xff & (0 >> 8)));
    serverHandshake[7] = ((byte) (0xff & 0));

    byte[] random = generateRandomData(HANDSHAKE_LENGTH-8);
    System.arraycopy(random, 0, serverHandshake, 8, random.length);

    out.write(0x03);
    out.write(serverHandshake);
    out.write(clientHandshake);

    byte[] s1 = new byte[HANDSHAKE_LENGTH];
    in.read(s1);

    if(!Arrays.equals(serverHandshake, s1)){
        return false;
    }

    return true;
}

public static byte[] generateRandomData(int size){
    Random random = new Random();

    byte[] bytes = new byte[size];
    random.nextBytes(bytes);

    return bytes;
}
`