func (cert *obfs4ServerCert) unpack() (*ntor.NodeID, *ntor.PublicKey) {
if len(cert.raw) != certLength {
panic(fmt.Sprintf("cert length %d is invalid", len(cert.raw)))
}
nodeID, _ := ntor.NewNodeID(cert.raw[:ntor.NodeIDLength])
pubKey, _ := ntor.NewPublicKey(cert.raw[ntor.NodeIDLength:])
return nodeID, pubKey
}
func newJSONServerState(stateDir string, js *jsonServerState) (err error) {
// Generate everything a server needs, using the cryptographic PRNG.
var st obfs4ServerState
rawID := make([]byte, ntor.NodeIDLength)
if err = csrand.Bytes(rawID); err != nil {
return
}
if st.nodeID, err = ntor.NewNodeID(rawID); err != nil {
return
}
if st.identityKey, err = ntor.NewKeypair(false); err != nil {
return
}
if st.drbgSeed, err = drbg.NewSeed(); err != nil {
return
}
st.iatMode = iatNone
// Encode it into JSON format and write the state file.
js.NodeID = st.nodeID.Hex()
js.PrivateKey = st.identityKey.Private().Hex()
js.PublicKey = st.identityKey.Public().Hex()
js.DrbgSeed = st.drbgSeed.Hex()
js.IATMode = st.iatMode
var encoded []byte
if encoded, err = json.Marshal(js); err != nil {
return
}
if err = ioutil.WriteFile(path.Join(stateDir, stateFile), encoded, 0600); err != nil {
return err
}
return nil
}