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dkg/gennaro/round1.go

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+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package gennaro
+
+import (
+	"fmt"
+	"math/big"
+
+	"github.com/sonr-io/sonr/crypto/core"
+	"github.com/sonr-io/sonr/crypto/internal"
+	v1 "github.com/sonr-io/sonr/crypto/sharing/v1"
+)
+
+// Round1Bcast are the values that are broadcast to all other participants
+// after round1 completes
+type Round1Bcast = []*v1.ShareVerifier
+
+// Round1P2PSend are the values that are sent to individual participants based
+// on the id
+type Round1P2PSend = map[uint32]*Round1P2PSendPacket
+
+// Round1P2PSendPacket are the shares generated from the secret for a specific participant
+type Round1P2PSendPacket struct {
+	SecretShare   *v1.ShamirShare
+	BlindingShare *v1.ShamirShare
+}
+
+// Round1 computes the first round for the DKG
+// `secret` can be nil
+// NOTE: if `secret` is nil, a new secret is generated which creates a new key
+// if `secret` is set, then this performs key resharing aka proactive secret sharing update
+func (dp *Participant) Round1(secret []byte) (Round1Bcast, Round1P2PSend, error) {
+	if dp.round != 1 {
+		return nil, nil, internal.ErrInvalidRound
+	}
+
+	if secret == nil {
+		// 1. x $← Zq∗
+		s, err := dp.scalar.Random()
+		if err != nil {
+			return nil, nil, err
+		}
+		secret = s.Bytes()
+	} else {
+		s := new(big.Int).SetBytes(secret)
+		if !dp.scalar.IsValid(s) {
+			return nil, nil, fmt.Errorf("invalid secret value")
+		}
+		if s.Cmp(core.Zero) == 0 {
+			return nil, nil, internal.ErrZeroValue
+		}
+	}
+
+	var err error
+	// 2. {X1,...,Xt},{R1,...,Rt},{x1,...,xn},{r1,...,rn}= PedersenFeldmanShare(E,Q,x,t,{p1,...,pn})
+	dp.pedersenResult, err = dp.pedersen.Split(secret)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// 4. P2PSend x_j,r_j to participant p_j in {p_1,...,p_n}_{i != j}
+	p2pSend := make(Round1P2PSend, len(dp.otherParticipantShares))
+	for id := range dp.otherParticipantShares {
+		p2pSend[id] = &Round1P2PSendPacket{
+			SecretShare:   dp.pedersenResult.SecretShares[id-1],
+			BlindingShare: dp.pedersenResult.BlindingShares[id-1],
+		}
+	}
+
+	// Update internal state
+	dp.round = 2
+
+	// 3. EchoBroadcast {X_1,...,X_t} to all other participants.
+	return dp.pedersenResult.BlindedVerifiers, p2pSend, nil
+}