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
}
// 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
}
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})
}