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9_si_handler.go
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/
9_si_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 signer
import (
"errors"
"math/big"
"github.com/getamis/alice/types"
"github.com/getamis/sirius/log"
)
var (
big0 = big.NewInt(0)
// ErrZeroS is returned if the s is zero
ErrZeroS = errors.New("zero s")
)
type siData struct {
si *big.Int
}
type siHandler struct {
*decommitUiTiHandler
s *big.Int
}
func newSiHandler(p *decommitUiTiHandler) (*siHandler, error) {
return &siHandler{
decommitUiTiHandler: p,
}, nil
}
func (p *siHandler) MessageType() types.MessageType {
return types.MessageType(Type_Si)
}
func (p *siHandler) GetRequiredMessageCount() uint32 {
return p.peerNum
}
func (p *siHandler) IsHandled(logger log.Logger, id string) bool {
peer, ok := p.peers[id]
if !ok {
logger.Warn("Peer not found")
return false
}
return peer.si != nil
}
func (p *siHandler) 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 ErrPeerNotFound
}
body := msg.GetSi()
peer.si = &siData{
si: new(big.Int).SetBytes(body.GetSi()),
}
return peer.AddMessage(msg)
}
func (p *siHandler) Finalize(logger log.Logger) (types.Handler, error) {
p.s = new(big.Int).Set(p.si)
for _, peer := range p.peers {
p.s = new(big.Int).Add(p.s, peer.si.si)
}
p.s.Mod(p.s, p.getCurve().Params().N)
if p.s.Cmp(big0) == 0 {
return nil, ErrZeroS
}
return nil, nil
}