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dkg/frost/participant.go

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+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+// Package frost is an implementation of the DKG part of  https://eprint.iacr.org/2020/852.pdf
+package frost
+
+import (
+	"strconv"
+
+	"github.com/sonr-io/sonr/crypto/core/curves"
+	"github.com/sonr-io/sonr/crypto/internal"
+	"github.com/sonr-io/sonr/crypto/sharing"
+)
+
+type DkgParticipant struct {
+	round                  int
+	Curve                  *curves.Curve
+	otherParticipantShares map[uint32]*dkgParticipantData
+	Id                     uint32
+	SkShare                curves.Scalar
+	VerificationKey        curves.Point
+	VkShare                curves.Point
+	feldman                *sharing.Feldman
+	verifiers              *sharing.FeldmanVerifier
+	secretShares           []*sharing.ShamirShare
+	ctx                    byte
+}
+
+type dkgParticipantData struct {
+	Id        uint32
+	Share     *sharing.ShamirShare
+	Verifiers *sharing.FeldmanVerifier
+}
+
+func NewDkgParticipant(
+	id, threshold uint32,
+	ctx string,
+	curve *curves.Curve,
+	otherParticipants ...uint32,
+) (*DkgParticipant, error) {
+	if curve == nil || len(otherParticipants) == 0 {
+		return nil, internal.ErrNilArguments
+	}
+	limit := uint32(len(otherParticipants)) + 1
+	feldman, err := sharing.NewFeldman(threshold, limit, curve)
+	if err != nil {
+		return nil, err
+	}
+	otherParticipantShares := make(map[uint32]*dkgParticipantData, len(otherParticipants))
+	for _, id := range otherParticipants {
+		otherParticipantShares[id] = &dkgParticipantData{
+			Id: id,
+		}
+	}
+
+	// SetBigInt the common fixed string
+	ctxV, _ := strconv.Atoi(ctx)
+
+	return &DkgParticipant{
+		Id:                     id,
+		round:                  1,
+		Curve:                  curve,
+		feldman:                feldman,
+		otherParticipantShares: otherParticipantShares,
+		ctx:                    byte(ctxV),
+	}, nil
+}