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addshare.go
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addshare.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 newpeer
import (
"math/big"
"github.com/getamis/alice/crypto/birkhoffinterpolation"
"github.com/getamis/alice/crypto/ecpointgrouplaw"
"github.com/getamis/alice/crypto/tss"
"github.com/getamis/alice/crypto/tss/ecdsa/addshare"
"github.com/getamis/alice/types"
"github.com/getamis/alice/types/message"
"github.com/getamis/sirius/log"
)
type AddShare struct {
ph *peerHandler
*message.MsgMain
}
type Result struct {
PartialPublicKeys map[string]*ecpointgrouplaw.ECPoint
PublicKey *ecpointgrouplaw.ECPoint
Share *big.Int
Bks map[string]*birkhoffinterpolation.BkParameter
}
func NewAddShare(peerManager types.PeerManager, pubkey *ecpointgrouplaw.ECPoint, threshold, newPeerRank uint32, listener types.StateChangedListener) *AddShare {
ph := newPeerHandler(peerManager, pubkey, threshold, newPeerRank)
return &AddShare{
ph: ph,
MsgMain: message.NewMsgMain(peerManager.SelfID(), peerManager.NumPeers(), listener, ph, types.MessageType(addshare.Type_OldPeer), types.MessageType(addshare.Type_Result)),
}
}
// GetResult returns the final result: public key, share, bks (including self bk)
func (a *AddShare) GetResult() (*Result, error) {
if a.GetState() != types.StateDone {
return nil, tss.ErrNotReady
}
h := a.GetHandler()
rh, ok := h.(*resultHandler)
if !ok {
log.Error("We cannot convert to result handler in done state")
return nil, tss.ErrNotReady
}
// Total bks = peer bks + self bk
bks := make(map[string]*birkhoffinterpolation.BkParameter, a.ph.peerManager.NumPeers()+1)
pks := make(map[string]*ecpointgrouplaw.ECPoint, a.ph.peerManager.NumPeers()+1)
bks[a.ph.peerManager.SelfID()] = rh.bk
pks[a.ph.peerManager.SelfID()] = rh.siG
for id, peer := range a.ph.peers {
bks[id] = peer.peer.bk
pks[id] = peer.peer.siG
}
return &Result{
PartialPublicKeys: pks,
PublicKey: rh.pubkey,
Share: rh.share,
Bks: bks,
}, nil
}