mirror of
				https://source.quilibrium.com/quilibrium/ceremonyclient.git
				synced 2025-11-04 15:37:27 +00:00 
			
		
		
		
	
		
			
				
	
	
		
			199 lines
		
	
	
		
			5.1 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
			
		
		
	
	
			199 lines
		
	
	
		
			5.1 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
//
 | 
						|
// Copyright Coinbase, Inc. All Rights Reserved.
 | 
						|
//
 | 
						|
// SPDX-License-Identifier: Apache-2.0
 | 
						|
//
 | 
						|
 | 
						|
package main
 | 
						|
 | 
						|
import (
 | 
						|
	"crypto/ecdsa"
 | 
						|
	crand "crypto/rand"
 | 
						|
	"crypto/sha512"
 | 
						|
	"flag"
 | 
						|
	"fmt"
 | 
						|
	"math/big"
 | 
						|
 | 
						|
	"github.com/btcsuite/btcd/btcec"
 | 
						|
 | 
						|
	"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
 | 
						|
	dkg "source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/dkg/gennaro"
 | 
						|
	v1 "source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/sharing/v1"
 | 
						|
)
 | 
						|
 | 
						|
const LIMIT = 4
 | 
						|
const THRESHOLD = 2
 | 
						|
 | 
						|
func main() {
 | 
						|
	var threshold int
 | 
						|
	var limit int
 | 
						|
	var help bool
 | 
						|
	flag.IntVar(&threshold, "t", THRESHOLD, "the minimum number of participants to sign")
 | 
						|
	flag.IntVar(&threshold, "threshold", THRESHOLD, "the minimum number of participants to sign")
 | 
						|
	flag.IntVar(&limit, "n", LIMIT, "the total number of participants")
 | 
						|
	flag.IntVar(&limit, "limit", LIMIT, "the total number of participants")
 | 
						|
	flag.BoolVar(&help, "h", false, "Print this menu")
 | 
						|
	flag.BoolVar(&help, "help", false, "Print this menu")
 | 
						|
	flag.Parse()
 | 
						|
 | 
						|
	if help {
 | 
						|
		printHelp()
 | 
						|
		return
 | 
						|
	}
 | 
						|
 | 
						|
	fmt.Printf("Threshold is %d\n", threshold)
 | 
						|
	fmt.Printf("Total participants is %d\n", limit)
 | 
						|
 | 
						|
	// DEMO doing Gennaro DKG and that signers can compute a signature
 | 
						|
	participants := createDkgParticipants(threshold, limit)
 | 
						|
 | 
						|
	// DKG Round 1
 | 
						|
	rnd1Bcast, rnd1P2p := round1(participants)
 | 
						|
 | 
						|
	// DKG Round 2
 | 
						|
	rnd2Bcast := round2(participants, rnd1Bcast, rnd1P2p)
 | 
						|
 | 
						|
	// DKG Round 3
 | 
						|
	verificationKey, signingShares := round3(participants, rnd2Bcast)
 | 
						|
 | 
						|
	// Signing common setup for all participants
 | 
						|
	msg := []byte("All my bitcoin is stored here")
 | 
						|
	scheme, _ := v1.NewShamir(threshold, limit, curves.NewField(btcec.S256().N))
 | 
						|
	shares := make([]*v1.ShamirShare, 0, threshold)
 | 
						|
	cnt := 0
 | 
						|
	for _, share := range signingShares {
 | 
						|
		if cnt == threshold {
 | 
						|
			break
 | 
						|
		}
 | 
						|
		cnt++
 | 
						|
		shares = append(shares, share)
 | 
						|
	}
 | 
						|
	sk, err := scheme.Combine(shares...)
 | 
						|
	if err != nil {
 | 
						|
		panic(err)
 | 
						|
	}
 | 
						|
 | 
						|
	pk, err := curves.NewScalarBaseMult(btcec.S256(), new(big.Int).SetBytes(sk))
 | 
						|
	if err != nil {
 | 
						|
		panic(err)
 | 
						|
	}
 | 
						|
	if !pk.Equals(verificationKey) {
 | 
						|
		panic("verification keys are not equal")
 | 
						|
	}
 | 
						|
 | 
						|
	privKey, pubKey := btcec.PrivKeyFromBytes(btcec.S256(), sk)
 | 
						|
 | 
						|
	hBytes := sha512.Sum384(msg)
 | 
						|
	hMsg := new(big.Int).SetBytes(hBytes[:])
 | 
						|
	hMsg.Mod(hMsg, btcec.S256().N)
 | 
						|
 | 
						|
	r, s, err := ecdsa.Sign(crand.Reader, privKey.ToECDSA(), hMsg.Bytes())
 | 
						|
	if err != nil {
 | 
						|
		panic(err)
 | 
						|
	}
 | 
						|
	ok := ecdsa.Verify(pubKey.ToECDSA(), hMsg.Bytes(), r, s)
 | 
						|
 | 
						|
	fmt.Printf("Signature verification - %v\n", ok)
 | 
						|
}
 | 
						|
 | 
						|
func round1(participants map[uint32]*dkg.Participant) (map[uint32]dkg.Round1Bcast, map[uint32]dkg.Round1P2PSend) {
 | 
						|
	// DKG Round 1
 | 
						|
	rnd1Bcast := make(map[uint32]dkg.Round1Bcast, len(participants))
 | 
						|
	rnd1P2p := make(map[uint32]dkg.Round1P2PSend, len(participants))
 | 
						|
	for id, p := range participants {
 | 
						|
		fmt.Printf("Computing DKG Round 1 for participant %d\n", id)
 | 
						|
		bcast, p2psend, err := p.Round1(nil)
 | 
						|
		if err != nil {
 | 
						|
			panic(err)
 | 
						|
		}
 | 
						|
		rnd1Bcast[id] = bcast
 | 
						|
		rnd1P2p[id] = p2psend
 | 
						|
	}
 | 
						|
 | 
						|
	return rnd1Bcast, rnd1P2p
 | 
						|
}
 | 
						|
 | 
						|
func round2(participants map[uint32]*dkg.Participant,
 | 
						|
	rnd1Bcast map[uint32]dkg.Round1Bcast,
 | 
						|
	rnd1P2p map[uint32]dkg.Round1P2PSend,
 | 
						|
) map[uint32]dkg.Round2Bcast {
 | 
						|
	rnd2Bcast := make(map[uint32]dkg.Round2Bcast, len(participants))
 | 
						|
	for id := range rnd1Bcast {
 | 
						|
		fmt.Printf("Computing DKG Round 2 for participant %d\n", id)
 | 
						|
 | 
						|
		rnd1P2pForP := make(map[uint32]*dkg.Round1P2PSendPacket)
 | 
						|
		for jid := range rnd1P2p {
 | 
						|
			if jid == id {
 | 
						|
				continue
 | 
						|
			}
 | 
						|
			rnd1P2pForP[jid] = rnd1P2p[jid][id]
 | 
						|
		}
 | 
						|
		bcast, err := participants[id].Round2(rnd1Bcast, rnd1P2pForP)
 | 
						|
		if err != nil {
 | 
						|
			panic(err)
 | 
						|
		}
 | 
						|
		rnd2Bcast[id] = bcast
 | 
						|
	}
 | 
						|
 | 
						|
	return rnd2Bcast
 | 
						|
}
 | 
						|
 | 
						|
func round3(participants map[uint32]*dkg.Participant, rnd2Bcast map[uint32]dkg.Round2Bcast) (*curves.EcPoint, map[uint32]*v1.ShamirShare) {
 | 
						|
	signingShares := make(map[uint32]*v1.ShamirShare, len(participants))
 | 
						|
	var verificationKey *curves.EcPoint
 | 
						|
	for id := range rnd2Bcast {
 | 
						|
		fmt.Printf("Computing DKG Round 3 for participant %d\n", id)
 | 
						|
 | 
						|
		pk, sk, err := participants[id].Round3(rnd2Bcast)
 | 
						|
		verificationKey = pk
 | 
						|
		if err != nil {
 | 
						|
			panic(err)
 | 
						|
		}
 | 
						|
		fmt.Printf("DKG completed for participant %d\n", id)
 | 
						|
		signingShares[id] = sk
 | 
						|
	}
 | 
						|
	return verificationKey, signingShares
 | 
						|
}
 | 
						|
 | 
						|
func createDkgParticipants(thresh, limit int) map[uint32]*dkg.Participant {
 | 
						|
	curve := btcec.S256()
 | 
						|
	gx, gy, err := v1.K256GeneratorFromHashedBytes([]byte("Fair is foul, and foul is fair: Hover through the fog and filthy air."))
 | 
						|
	if err != nil {
 | 
						|
		panic(err)
 | 
						|
	}
 | 
						|
	generator := &curves.EcPoint{
 | 
						|
		Curve: curve,
 | 
						|
		X:     gx,
 | 
						|
		Y:     gy,
 | 
						|
	}
 | 
						|
	participants := make(map[uint32]*dkg.Participant, limit)
 | 
						|
	for i := 1; i <= limit; i++ {
 | 
						|
		otherIds := make([]uint32, limit-1)
 | 
						|
		idx := 0
 | 
						|
		for j := 1; j <= limit; j++ {
 | 
						|
			if i == j {
 | 
						|
				continue
 | 
						|
			}
 | 
						|
			otherIds[idx] = uint32(j)
 | 
						|
			idx++
 | 
						|
		}
 | 
						|
		p, err := dkg.NewParticipant(uint32(i), uint32(thresh), generator, curves.NewK256Scalar(), otherIds...)
 | 
						|
		if err != nil {
 | 
						|
			panic(err)
 | 
						|
		}
 | 
						|
		participants[uint32(i)] = p
 | 
						|
	}
 | 
						|
	return participants
 | 
						|
}
 | 
						|
 | 
						|
func printHelp() {
 | 
						|
	fmt.Printf(`
 | 
						|
k256 INPUT
 | 
						|
Simulate a DKG using secp256k1 keys
 | 
						|
FLAGS:
 | 
						|
  -h, --help						Show this help message and exit
 | 
						|
  -n, --limit						The total number of participants
 | 
						|
  -t, --treshold					The minimum number of participants needed to sign
 | 
						|
`)
 | 
						|
}
 |