File content as of revision 147:a6093b52e654:

#include <stdbool.h>

#include "http.h"
#include "tcpbuf.h"
#include "action.h"
#include "net.h"
#include "log.h"
#include "led.h"
#include "restart.h"
#include "mstimer.h"

#define TLS_CONTENT_TYPE_ChangeCipher      20
#define TLS_CONTENT_TYPE_Alert             21
#define TLS_CONTENT_TYPE_Handshake         22
#define TLS_CONTENT_TYPE_Application       23
#define TLS_CONTENT_TYPE_Heartbeat         24

#define TLS_HANDSHAKE_HelloRequest          0
#define TLS_HANDSHAKE_ClientHello           1
#define TLS_HANDSHAKE_ServerHello           2
#define TLS_HANDSHAKE_NewSessionTicket      4
#define TLS_HANDSHAKE_EncryptedExtensions   8
#define TLS_HANDSHAKE_Certificate          11
#define TLS_HANDSHAKE_ServerKeyExchange    12
#define TLS_HANDSHAKE_CertificateRequest   13
#define TLS_HANDSHAKE_ServerHelloDone      14
#define TLS_HANDSHAKE_CertificateVerify    15
#define TLS_HANDSHAKE_ClientKeyExchange    16
#define TLS_HANDSHAKE_Finished             20

#define DO_NOTHING      0
#define DO_SERVER_HELLO 1
#define DO_APPLICATION  2

bool TlsTrace = true;

struct state
{
    int      toDo;
};
static void logContentType(char contentType)
{
    switch (contentType)
    {
        case TLS_CONTENT_TYPE_ChangeCipher: Log ("Change cipher");      break;
        case TLS_CONTENT_TYPE_Alert:        Log ("Alert");              break;
        case TLS_CONTENT_TYPE_Handshake:    Log ("Handshake");          break;
        case TLS_CONTENT_TYPE_Application:  Log ("Application");        break;
        case TLS_CONTENT_TYPE_Heartbeat:    Log ("Heartbeat");          break;
        default:                            LogF("%02hX", contentType); break;
    }
}
static void logHandshakeType(char handshakeType)
{
    switch (handshakeType)
    {
        case TLS_HANDSHAKE_HelloRequest:        Log ("Hello request");        break;
        case TLS_HANDSHAKE_ClientHello:         Log ("Client hello");         break;
        case TLS_HANDSHAKE_ServerHello:         Log ("Server hello");         break;
        case TLS_HANDSHAKE_NewSessionTicket:    Log ("New session ticket");   break;
        case TLS_HANDSHAKE_EncryptedExtensions: Log ("Encrypted extensions"); break;
        case TLS_HANDSHAKE_Certificate:         Log ("Certificate");          break;
        case TLS_HANDSHAKE_ServerKeyExchange:   Log ("Server key exchange");  break;
        case TLS_HANDSHAKE_CertificateRequest:  Log ("Certificate request");  break;
        case TLS_HANDSHAKE_ServerHelloDone:     Log ("Server hello done");    break;
        case TLS_HANDSHAKE_CertificateVerify:   Log ("Certificate verify");   break;
        case TLS_HANDSHAKE_ClientKeyExchange:   Log ("Client key exchange");  break;
        case TLS_HANDSHAKE_Finished:            Log ("Finished");             break;
        default:                                LogF("%02hX", handshakeType); break;
    }
}
void TlsRequest(char* pTlsState, char* pWebState, int size, char* pRequestStream, uint32_t positionInRequestStream)
{
    struct state* pState = (struct state*)pTlsState;
    
    if (TlsTrace) LogF("TLS <<< %d (%u)\r\n", size, positionInRequestStream);

    if (size == 0) return;
    if (positionInRequestStream != 0) return;
    char contentType = pRequestStream[0];
    if (TlsTrace) { Log("      content type: "); logContentType(contentType); Log("\r\n"); }
    switch (contentType)
    {
        case TLS_CONTENT_TYPE_Handshake:
            {
                char handshakeType = pRequestStream[5];
                if (TlsTrace) { Log("      handshake type: "); logHandshakeType(handshakeType); Log("\r\n"); }
                pState->toDo = DO_SERVER_HELLO;
                return;
            }
        case TLS_CONTENT_TYPE_Application:
            {
                pState->toDo = DO_APPLICATION;
                return;
            }
        default:
            Log("TLS - ignoring untreated content type\r\n");
            pState->toDo = DO_NOTHING;
            return;
    }
    //ECDHE-RSA-AES128-GCM-SHA256
}
static void sendServerHello()
{
    Log("     sending server hello\r\n");
}

int TlsPoll(char* pTlsState, char* pWebState, bool clientFinished)
{
    struct state* pState = (struct state*)pTlsState;
    
    switch (pState->toDo)
    {
        case DO_NOTHING:
            if (clientFinished) return -1; //The client hasn't made a request and never will so finish
            else                return  0; //The client hasn't made a request yet but it could.
        case DO_APPLICATION:    return HttpPollFunction(pWebState, clientFinished); //Return whatever HTTP would be
        default:                return  1; //The client has made a request so do it
    }
}
bool TlsReply(char* pTlsState, char* pWebState)
{
    struct state* pState = (struct state*)pTlsState;
    
    if ( pState->toDo == DO_SERVER_HELLO) sendServerHello();

    return false; //Finished
}
static char encrypt(char c)
{
    return c; //Implement encryption
}
void TlsAddChar(char c)
{
    char e = encrypt(c);
    TcpBufAddChar(e);
}