Ejemplo n.º 1
0
func loadHost(hostname string, m map[string]*sign.Node, testSuite abstract.Suite, testRand cipher.Stream, hc *HostConfig) *sign.Node {
	if h, ok := m[hostname]; ok {
		return h
	}
	host := coconet.NewGoHost(hostname, coconet.NewGoDirectory())
	h := sign.NewNode(host, testSuite, testRand)
	hc.Hosts[hostname] = h
	m[hostname] = h
	return h
}
Ejemplo n.º 2
0
// ConstructTree does a depth-first construction of the tree specified in the
// config file. ConstructTree must be called AFTER populating the HostConfig with
// ALL the possible hosts.
func ConstructTree(
	n *Node,
	hc *HostConfig,
	parent string,
	suite abstract.Suite,
	rand cipher.Stream,
	hosts map[string]coconet.Host,
	nameToAddr map[string]string,
	opts ConfigOptions) (int, error) {
	// passes up its X_hat, and/or an error

	// get the name associated with this address
	name, ok := nameToAddr[n.Name]
	if !ok {
		fmt.Println("unknown name in address book:", n.Name)
		return 0, errors.New("unknown name in address book")
	}

	// generate indicates whether we should generate the signing
	// node for this hostname
	generate := opts.Host == "" || opts.Host == name

	// check to make sure the this hostname is in the tree
	// it can be backed by a nil pointer
	h, ok := hosts[name]
	if !ok {
		fmt.Println("unknown host in tree:", name)
		return 0, errors.New("unknown host in tree")
	}

	var prikey abstract.Secret
	var pubkey abstract.Point
	var sn *sign.Node

	// if the JSON holds the fields field is set load from there
	if len(n.PubKey) != 0 {
		// log.Println("decoding point")
		encoded, err := hex.DecodeString(string(n.PubKey))
		if err != nil {
			log.Print("failed to decode hex from encoded")
			return 0, err
		}
		pubkey = suite.Point()
		err = pubkey.UnmarshalBinary(encoded)
		if err != nil {
			log.Print("failed to decode point from hex")
			return 0, err
		}
		// log.Println("decoding point")
		encoded, err = hex.DecodeString(string(n.PriKey))
		if err != nil {
			log.Print("failed to decode hex from encoded")
			return 0, err
		}
		prikey = suite.Secret()
		err = prikey.UnmarshalBinary(encoded)
		if err != nil {
			log.Print("failed to decode point from hex")
			return 0, err
		}
	}
	if generate {
		if prikey != nil {
			// if we have been given a private key load that
			aux := sign.NewKeyedNode(h, suite, prikey)
			aux.GenSetPool()
			hc.SNodes = append(hc.SNodes, aux)
			h.SetPubKey(pubkey)
		} else {
			// otherwise generate a random new one
			sn := sign.NewNode(h, suite, rand)
			sn.GenSetPool()
			hc.SNodes = append(hc.SNodes, sn)
			h.SetPubKey(sn.PubKey)
		}
		sn = hc.SNodes[len(hc.SNodes)-1]
		hc.Hosts[name] = sn
		if prikey == nil {
			prikey = sn.PrivKey
			pubkey = sn.PubKey
		}
		// log.Println("pubkey:", sn.PubKey)
		// log.Println("given: ", pubkey)
	}
	// if the parent of this call is empty then this must be the root node
	if parent != "" && generate {
		h.AddParent(0, parent)
	}
	// log.Println("name: ", n.Name)
	// log.Println("prikey: ", prikey)
	// log.Println("pubkey: ", pubkey)
	height := 0
	for _, c := range n.Children {
		// connect this node to its children
		cname, ok := nameToAddr[c.Name]
		if !ok {
			fmt.Println("unknown name in address book:", n.Name)
			return 0, errors.New("unknown name in address book")
		}

		if generate {
			h.AddChildren(0, cname)
		}

		// recursively construct the children
		// log.Print("ConstructTree:", h, suite, rand, hosts, nameToAddr, opts)
		h, err := ConstructTree(c, hc, name, suite, rand, hosts, nameToAddr, opts)
		if err != nil {
			return 0, err
		}
		height = max(h+1, height)
		// if generating all csn will be availible
	}
	if generate {
		sn.Height = height
	}
	// log.Println("name: ", n.Name)
	// log.Println("final x_hat: ", x_hat)
	// log.Println("final pubkey: ", pubkey)
	return height, nil
}
Ejemplo n.º 3
0
func runStaticTest(signType sign.Type, RoundsPerView int, faultyNodes ...int) error {
	// Crypto setup
	suite := nist.NewAES128SHA256P256()
	rand := suite.Cipher([]byte("example"))

	// number of nodes for the test
	nNodes := 4
	// create new directory for communication between peers
	dir := coconet.NewGoDirectory()
	// Create Hosts and Peers
	h := make([]coconet.Host, nNodes)

	for i := 0; i < nNodes; i++ {
		hostName := "host" + strconv.Itoa(i)

		if len(faultyNodes) > 0 {
			h[i] = &coconet.FaultyHost{}
			gohost := coconet.NewGoHost(hostName, dir)
			h[i] = coconet.NewFaultyHost(gohost)
		} else {
			h[i] = coconet.NewGoHost(hostName, dir)
		}

	}

	for _, fh := range faultyNodes {
		h[fh].(*coconet.FaultyHost).SetDeadFor("response", true)
	}

	// Create Signing Nodes out of the hosts
	nodes := make([]*sign.Node, nNodes)
	for i := 0; i < nNodes; i++ {
		nodes[i] = sign.NewNode(h[i], suite, rand)
		nodes[i].Type = signType
		nodes[i].GenSetPool()
		nodes[i].RoundsPerView = RoundsPerView
		defer nodes[i].Close()

		h[i].SetPubKey(nodes[i].PubKey)
		// To test the already keyed signing node, uncomment
		// PrivKey := suite.Secret().Pick(rand)
		// nodes[i] = NewKeyedNode(h[i], suite, PrivKey)
	}
	nodes[0].Height = 2
	nodes[1].Height = 1
	nodes[2].Height = 0
	nodes[3].Height = 0
	// Add edges to parents
	h[1].AddParent(DefaultView, h[0].Name())
	h[2].AddParent(DefaultView, h[1].Name())
	h[3].AddParent(DefaultView, h[1].Name())
	// Add edges to children, listen to children
	h[0].AddChildren(DefaultView, h[1].Name())
	h[1].AddChildren(DefaultView, h[2].Name(), h[3].Name())

	for _, host := range h {
		host.Listen()
		host.Connect(0)
	}

	for i := 0; i < nNodes; i++ {
		if len(faultyNodes) > 0 {
			nodes[i].FailureRate = 1
		}

		go func(i int) {
			// start listening for messages from within the tree
			nodes[i].Listen()
		}(i)
	}

	// Have root node initiate the signing protocol
	// via a simple annoucement
	nodes[0].LogTest = []byte("Hello World")
	// return nodes[0].Announce(DefaultView, &sign.AnnouncementMessage{LogTest: nodes[0].LogTest, Round: 1})
	return nodes[0].StartAnnouncement(&sign.AnnouncementMessage{LogTest: nodes[0].LogTest, Round: 1})
}