Exemplo n.º 1
0
// signStatement can be used to sign the contents passed in the io.Reader
// (pass an io.File or use an strings.NewReader for strings)
func signStatement(read io.Reader, el *onet.Roster) (*s.SignatureResponse,
	error) {
	publics := entityListToPublics(el)
	client := s.NewClient()
	msg, _ := crypto.HashStream(network.Suite.Hash(), read)

	pchan := make(chan *s.SignatureResponse)
	var err error
	go func() {
		log.Lvl3("Waiting for the response on SignRequest")
		response, e := client.SignatureRequest(el, msg)
		if e != nil {
			err = e
			close(pchan)
			return
		}
		pchan <- response
	}()

	select {
	case response, ok := <-pchan:
		log.Lvl5("Response:", response)
		if !ok || err != nil {
			return nil, errors.New("received an invalid repsonse")
		}

		err = cosi.VerifySignature(network.Suite, publics, msg, response.Signature)
		if err != nil {
			return nil, err
		}
		return response, nil
	case <-time.After(RequestTimeOut):
		return nil, errors.New("timeout on signing request")
	}
}
Exemplo n.º 2
0
func verifySignatureHash(b []byte, sig *s.SignatureResponse, el *onet.Roster) error {
	// We have to hash twice, as the hash in the signature is the hash of the
	// message sent to be signed
	publics := entityListToPublics(el)
	fHash, _ := crypto.HashBytes(network.Suite.Hash(), b)
	hashHash, _ := crypto.HashBytes(network.Suite.Hash(), fHash)
	if !bytes.Equal(hashHash, sig.Hash) {
		return errors.New("You are trying to verify a signature " +
			"belonging to another file. (The hash provided by the signature " +
			"doesn't match with the hash of the file.)")
	}
	if err := cosi.VerifySignature(network.Suite, publics, fHash, sig.Signature); err != nil {
		return errors.New("Invalid sig:" + err.Error())
	}
	return nil
}
Exemplo n.º 3
0
func TestCoSimul(t *testing.T) {
	for VerifyResponse = 0; VerifyResponse < 3; VerifyResponse++ {
		for _, nbrHosts := range []int{1, 3, 13} {
			log.Lvl2("Running cosi with", nbrHosts, "hosts")
			local := onet.NewLocalTest()

			hosts, _, tree := local.GenBigTree(nbrHosts, nbrHosts, 3, true)
			log.Lvl2(tree.Dump())

			done := make(chan bool)
			// create the message we want to sign for this round
			msg := []byte("Hello World Cosi")

			// Register the function generating the protocol instance
			var root *CoSimul
			// function that will be called when protocol is finished by the root
			doneFunc := func(sig []byte) {
				suite := hosts[0].Suite()
				if err := cosi.VerifySignature(suite, root.Publics(),
					msg, sig); err != nil {
					t.Fatal("error verifying signature:", err)
				} else {
					log.Lvl1("Verification OK")
				}
				done <- true
			}

			// Start the protocol
			p, err := local.CreateProtocol(Name, tree)
			if err != nil {
				t.Fatal("Couldn't create new node:", err)
			}
			root = p.(*CoSimul)
			root.Message = msg
			root.RegisterSignatureHook(doneFunc)
			go root.StartProtocol()
			select {
			case <-done:
			case <-time.After(time.Second * 2):
				t.Fatal("Could not get signature verification done in time")
			}
			local.CloseAll()
		}
	}
}
Exemplo n.º 4
0
func TestServiceCosi(t *testing.T) {
	defer log.AfterTest(t)
	log.TestOutput(testing.Verbose(), 4)
	local := onet.NewTCPTest()
	// generate 5 hosts, they don't connect, they process messages, and they
	// don't register the tree or entitylist
	hosts, el, _ := local.GenTree(5, false)
	defer local.CloseAll()

	// Send a request to the service
	client := NewTestClient(local)
	msg := []byte("hello cosi service")
	log.Lvl1("Sending request to service...")
	res, err := client.SignatureRequest(el, msg)
	log.ErrFatal(err, "Couldn't send")

	// verify the response still
	assert.Nil(t, cosi.VerifySignature(hosts[0].Suite(), el.Publics(),
		msg, res.Signature))
}
Exemplo n.º 5
0
// Run implements onet.Simulation.
func (cs *Simulation) Run(config *onet.SimulationConfig) error {
	size := len(config.Roster.List)
	msg := []byte("Hello World Cosi Simulation")
	log.Lvl2("Simulation starting with: Size=", size, ", Rounds=", cs.Rounds)
	for round := 0; round < cs.Rounds; round++ {
		log.Lvl1("Starting round", round)
		roundM := monitor.NewTimeMeasure("round")
		// create the node with the protocol, but do NOT start it yet.
		node, err := config.Overlay.CreateProtocolOnet(Name, config.Tree)
		if err != nil {
			return err
		}
		// the protocol itself
		proto := node.(*CoSimul)
		// give the message to sign
		proto.SigningMessage(msg)
		// tell us when it is done
		done := make(chan bool)
		fn := func(sig []byte) {
			roundM.Record()
			publics := proto.Publics()
			if err := cosi.VerifySignature(network.Suite, publics,
				msg, sig); err != nil {
				log.Lvl1("Round", round, " => fail verification")
			} else {
				log.Lvl2("Round", round, " => success")
			}
			done <- true
		}
		proto.RegisterSignatureHook(fn)
		if err := proto.Start(); err != nil {
			log.Error("Couldn't start protocol in round", round)
		}
		<-done
	}
	log.Lvl1("Simulation finished")
	return nil
}
Exemplo n.º 6
0
// VerifySignature returns whether the BlockLink has been signed
// correctly using the aggregate key given.
func (bl *BlockLink) VerifySignature(publics []abstract.Point) error {
	// TODO: enable real verification once we have signatures
	//return nil
	return cosi.VerifySignature(network.Suite, publics, bl.Hash, bl.Signature)
}
Exemplo n.º 7
0
// VerifySignature verifies if the challenge and the secret (from the response phase) form a
// correct signature for this message using the aggregated public key.
// This is copied from cosi, so that you don't need to include both lib/cosi
// and protocols/cosi
func VerifySignature(suite abstract.Suite, publics []abstract.Point, msg, sig []byte) error {
	return cosi.VerifySignature(suite, publics, msg, sig)
}