func (p *Protocol) verifySignatureReply(sig *SignatureReply) string {
if sig.Index >= len(p.Roster().List) {
log.Error("Index in signature reply out of range")
return "FAIL"
}
entity := p.Roster().List[sig.Index]
var s string
if err := crypto.VerifySchnorr(p.Suite(), entity.Public, p.Message, sig.Sig); err != nil {
s = "FAIL"
} else {
s = "SUCCESS"
}
return s
}
// Go routine that will do the verification of the signature request in
// parrallele
func (nt *Ntree) verifySignatureRequest(msg *RoundSignatureRequest) {
// verification if we have too much exceptions
threshold := int(math.Ceil(float64(len(nt.Tree().List())) / 3.0))
if len(msg.Exceptions) > threshold {
nt.verifySignatureRequestChan <- false
}
// verification of all the signatures
var goodSig int
marshalled, _ := json.Marshal(nt.block)
for _, sig := range msg.Sigs {
if err := crypto.VerifySchnorr(nt.Suite(), nt.Public(), marshalled, sig); err == nil {
goodSig++
}
}
log.Lvl3(nt.Name(), "Verification of signatures =>", goodSig, "/", len(msg.Sigs), ")")
// enough good signatures ?
if goodSig <= 2*threshold {
nt.verifySignatureRequestChan <- false
}
nt.verifySignatureRequestChan <- true
}