public void TestSharedSecret()
{
Request req;
Uri uriHello = new Uri("coap://localhost:" + _serverPort + "/hello");
Uri uri = new Uri("coap://localhost:" + _serverPort + "/" + "edhoc");
CoapClient clientHello = new CoapClient(uriHello);
CoapClient client = new CoapClient(uri);
// Try and get hello -- should fail because no security setup.
CoAP.Response resp = clientHello.Get();
Assert.AreEqual(CoAP.StatusCode.Unauthorized, resp.StatusCode);
// Create and send message #1 for PSK
EDHOC.EdhocInitiator init = new EdhocInitiator(psk);
byte[] msg = init.CreateMessage1();
req = new Request(Method.POST);
req.Payload = msg;
resp = client.Send(req);
Assert.AreEqual(CoAP.StatusCode.Changed, resp.StatusCode);
// Process response message
KeySet ks = new KeySet();
ks.AddKey(serverSignKey);
init.ParseMessage2(resp.Payload, ks);
// Post new message
msg = init.CreateMessage3();
req = new Request(Method.POST);
req.Payload = msg;
resp = client.Send(req);
Assert.AreEqual(StatusCode.Changed, resp.StatusCode);
// Setup my security context.
OSCOAP.SecurityContext ctx = init.CreateSecurityContext();
req = new Request(Method.GET);
req.URI = uriHello;
req.OscoapContext = ctx;
resp = clientHello.Send(req);
Assert.AreEqual(StatusCode.Content, resp.StatusCode);
}
protected override void DoPost(CoapExchange exchange)
{
byte[] body = exchange.Request.Payload;
EdhocResponder edhoc;
try {
switch (body[1] & 0xf)
{
case 1:
edhoc = EdhocResponder.ParseMessage1(body);
edhoc.SigningKey = _signKey;
body = edhoc.CreateMessage2();
exchange.Respond(CoAP.StatusCode.Changed, body);
break;
case 4:
edhoc = EdhocResponder.ParseMessage1(body);
OneKey y = null;
foreach (OneKey x in _allKeys)
{
if (x.ContainsName(CoseKeyKeys.KeyIdentifier))
{
if (x.HasKid(edhoc.KeyIdentifier))
{
if (y != null)
{
exchange.Respond(CoAP.StatusCode.BadRequest);
return;
}
y = new OneKey(x.AsCBOR());
}
}
}
if (y == null)
{
exchange.Respond(CoAP.StatusCode.BadRequest);
return;
}
if (!y[CoseKeyKeys.KeyType].Equals(GeneralValues.KeyType_Octet))
{
exchange.Respond(CoAP.StatusCode.BadRequest);
return;
}
edhoc.SharedSecret = y;
body = edhoc.CreateMessage2();
exchange.Respond(CoAP.StatusCode.Changed, body);
break;
case 3:
edhoc = EdhocResponder.ParseMessage3(body, _allKeys);
exchange.Respond(StatusCode.Changed);
OSCOAP.SecurityContext ctx = edhoc.CreateSecurityContext();
OSCOAP.SecurityContextSet.AllContexts.Add(ctx);
break;
case 6:
edhoc = EdhocResponder.ParseMessage3(body, _allKeys);
exchange.Respond(CoAP.StatusCode.Changed);
OSCOAP.SecurityContext ctx2 = edhoc.CreateSecurityContext();
OSCOAP.SecurityContextSet.AllContexts.Add(ctx2);
break;
default:
exchange.Respond(CoAP.StatusCode.BadRequest);
break;
}
}
catch (Exception e) {
CBORObject obj = CBORObject.NewArray();
obj.Add(0);
obj.Add(e.ToString());
exchange.Respond(CoAP.StatusCode.Content, obj.EncodeToBytes());
}
}
