Tls.cpp

//------------------------------------------------------------------------------
//This file is part of embKernel. 
//See license.txt for the full license governing this code.
//------------------------------------------------------------------------------

#include "Tls.hpp"
#include "LibEndian.hpp"
#include "LibRtc.hpp"

const Tls::CIPHER_SUITE Tls::mCiphers[] = {
        {
                0x00, 0x05, 0 }, //TLS_RSA_WITH_RC4_128_SHA
        {
                0x00, 0x13, 0 } //TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA
};

Tls::Tls() {
}

Tls::~Tls() {
}

Tls::RESULT Tls::handshake(LibStreamIn& in, LibStreamOut& out) {
    uint16_t len = (uint16_t) (sizeof(HANDSHAKE) + sizeof(RANDOM) + 1 + 2 + (CIPHER_COUNT * 2) + 2);

    {
        TLS_HEADER tlsHeader;
        tlsHeader.type = CT_HANDSHAKE;
        tlsHeader.version.major = 3;
        tlsHeader.version.minor = 1;
        tlsHeader.length = LibEndian::hwToBe(len);
        out.write(&tlsHeader, sizeof(tlsHeader));
    }

    len -= 4;
    {
        HANDSHAKE handshake;
        handshake.msg_type = AT_CLIENT_HELLO;
        handshake.zero = 0;
        handshake.length = LibEndian::hwToBe(len);
        handshake.version.major = 3;
        handshake.version.minor = 1;
        out.write(&handshake, sizeof(handshake));
    }

    {
        RANDOM random;
        random.gmt_unix_time = LibEndian::hwToBe(LibRtc::getGmtUnixTime());
        //TODO random_bytes
        out.write(&random, sizeof(random));
    }

    { //Session id length
        out.writeByte(0);
    }

    { //Cipher
        len = CIPHER_COUNT * 2;
        len = LibEndian::hwToBe(len);
        out.write(&len, sizeof(len));
        for (int i = 0; i < CIPHER_COUNT; i++) {
            out.write(&mCiphers[i].idHi, 2);
        }
    }

    { //Session id length
        out.writeByte(1);
        out.writeByte(0);
    }

    return RES_SUCCESS;
}