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crypto/dkg/gennaro/round3.go

@@ -1,89 +0,0 @@
-//
-// Copyright Coinbase, Inc. All Rights Reserved.
-//
-// SPDX-License-Identifier: Apache-2.0
-//
-
-package gennaro
-
-import (
-	"fmt"
-
-	"github.com/onsonr/hway/crypto/internal"
-	v1 "github.com/onsonr/hway/crypto/sharing/v1"
-)
-
-// Round3Bcast contains values that will be broadcast to other participants.
-type Round3Bcast = v1.ShareVerifier
-
-// Round3 computes the third round for Gennaro DKG
-// Algorithm 4 - Gennaro DKG Round 3
-// bcast contains all Round2 broadcast from other participants to this participant.
-func (dp *Participant) Round3(bcast map[uint32]Round2Bcast) (*Round3Bcast, *v1.ShamirShare, error) {
-	// Check participant is not empty
-	if dp == nil || dp.curve == nil {
-		return nil, nil, internal.ErrNilArguments
-	}
-
-	// Check participant has the correct dkg round number
-	if dp.round != 3 {
-		return nil, nil, internal.ErrInvalidRound
-	}
-
-	// Check the input is valid
-	if len(bcast) == 0 {
-		return nil, nil, internal.ErrNilArguments
-	}
-
-	// 1. SetBigInt Pk = R_i1
-	Pk := dp.pedersenResult.Verifiers[0]
-
-	// 2. for j in 1,...,n
-	for id := range bcast {
-		// 3. if i = j continue
-		if id == dp.id {
-			continue
-		}
-
-		// 4. If FeldmanVerify(E, xji, {R_j1,...,R_jt}) = false; abort
-		xji := dp.otherParticipantShares[id].Share
-		vs := bcast[id]
-		if ok, err := dp.feldman.Verify(xji, vs); !ok {
-			if err != nil {
-				return nil, nil, err
-			} else {
-				return nil, nil, fmt.Errorf("invalid share for participant #{id}")
-			}
-		}
-
-		// Store the feldman verifiers for round 4
-		dp.otherParticipantShares[id].Verifiers = vs
-
-		// 5. Pk = Pk+R_j1
-		temp, err := Pk.Add(bcast[id][0])
-		if err != nil {
-			return nil, nil, fmt.Errorf("error in computing Pk+R_j1")
-		} //nolint:errcheck
-		Pk = temp
-	}
-
-	// This is a sanity check to make sure nothing went wrong
-	// when computing the public key
-	if !Pk.IsOnCurve() || Pk.IsIdentity() {
-		return nil, nil, fmt.Errorf("invalid public key")
-	}
-
-	// 6. Store Pk as the public verification key
-	dp.verificationKey = Pk
-
-	// Update internal state
-	dp.round = 4
-
-	skShare := v1.ShamirShare{
-		Identifier: dp.id,
-		Value:      dp.skShare,
-	}
-
-	// Output Pk as the public verification key
-	return Pk, &skShare, nil
-}