/
1_decommit_handler.go
95 lines (83 loc) · 2.45 KB
/
1_decommit_handler.go
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// Copyright © 2020 AMIS Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dkg
import (
"github.com/getamis/alice/crypto/commitment"
"github.com/getamis/alice/crypto/ecpointgrouplaw"
"github.com/getamis/alice/crypto/tss"
"github.com/getamis/alice/types"
"github.com/getamis/sirius/log"
)
type decommitData struct {
u0g *ecpointgrouplaw.ECPoint
verifyMessage *Message
}
type decommitHandler struct {
*peerHandler
}
func newDecommitHandler(p *peerHandler) *decommitHandler {
return &decommitHandler{
peerHandler: p,
}
}
func (p *decommitHandler) MessageType() types.MessageType {
return types.MessageType(Type_Decommit)
}
func (p *decommitHandler) GetRequiredMessageCount() uint32 {
return p.peerNum
}
func (p *decommitHandler) IsHandled(logger log.Logger, id string) bool {
peer, ok := p.peers[id]
if !ok {
logger.Warn("Peer not found")
return false
}
return peer.decommit != nil
}
func (p *decommitHandler) HandleMessage(logger log.Logger, message types.Message) error {
msg := getMessage(message)
id := msg.GetId()
peer, ok := p.peers[id]
if !ok {
logger.Warn("Peer not found")
return tss.ErrPeerNotFound
}
// Ensure decommit successfully
body := msg.GetDecommit()
peerMessage := getMessageByType(peer, Type_Peer)
u0g, err := commitment.GetPointFromHashCommitment(peerMessage.GetPeer().GetCommitment(), body.GetHashDecommitment())
if err != nil {
logger.Warn("Failed to get u0g", "err", err)
return err
}
// Build and send the verify message
v := p.feldmanCommitmenter.GetVerifyMessage(peer.peer.bk)
peer.decommit = &decommitData{
u0g: u0g,
verifyMessage: &Message{
Type: Type_Verify,
Id: p.peerManager.SelfID(),
Body: &Message_Verify{
Verify: &BodyVerify{
Verify: v,
},
},
},
}
p.peerManager.MustSend(id, peer.decommit.verifyMessage)
return peer.AddMessage(msg)
}
func (p *decommitHandler) Finalize(logger log.Logger) (types.Handler, error) {
return newVerifyHandler(p), nil
}