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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package node
import (
"encoding/base64"
"fmt"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/data/account"
"github.com/algorand/go-algorand/data/basics"
"github.com/algorand/go-algorand/protocol"
)
const netPrioChallengeSize = 32
const netPrioChallengeSizeBase64Encoded = 44 // 32 * (4/3) rounded up to nearest multiple of 4 -> 44
type netPrioResponse struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
Nonce string `codec:"Nonce,allocbound=netPrioChallengeSizeBase64Encoded"`
}
type netPrioResponseSigned struct {
_struct struct{} `codec:",omitempty,omitemptyarray"`
Response netPrioResponse
Round basics.Round
Sender basics.Address
Sig crypto.OneTimeSignature
}
func (npr netPrioResponse) ToBeHashed() (protocol.HashID, []byte) {
return protocol.NetPrioResponse, protocol.Encode(&npr)
}
// NewPrioChallenge implements the network.NetPrioScheme interface
func (node *AlgorandFullNode) NewPrioChallenge() string {
var rand [netPrioChallengeSize]byte
crypto.RandBytes(rand[:])
return base64.StdEncoding.EncodeToString(rand[:])
}
// MakePrioResponse implements the network.NetPrioScheme interface
func (node *AlgorandFullNode) MakePrioResponse(challenge string) []byte {
if !node.config.AnnounceParticipationKey {
return nil
}
rs := netPrioResponseSigned{
Response: netPrioResponse{
Nonce: challenge,
},
}
// Find the participation key that has the highest weight in the
// latest round.
var maxWeight uint64
var maxPart account.ParticipationRecordForRound
latest := node.ledger.LastRound()
proto, err := node.ledger.ConsensusParams(latest)
if err != nil {
return nil
}
// Use the participation key for 2 rounds in the future, so that
// it's unlikely to be deleted from underneath of us.
voteRound := latest + 2
for _, part := range node.accountManager.Keys(voteRound) {
parent := part.Account
data, err := node.ledger.LookupAgreement(latest, parent)
if err != nil {
continue
}
weight := data.MicroAlgosWithRewards.ToUint64()
if weight > maxWeight {
maxPart = part
maxWeight = weight
}
}
if maxWeight == 0 {
return nil
}
signer := maxPart.VotingSigner()
ephID := basics.OneTimeIDForRound(voteRound, signer.KeyDilution(proto.DefaultKeyDilution))
rs.Round = voteRound
rs.Sender = maxPart.Account
rs.Sig = signer.Sign(ephID, rs.Response)
return protocol.Encode(&rs)
}
// VerifyPrioResponse implements the network.NetPrioScheme interface
func (node *AlgorandFullNode) VerifyPrioResponse(challenge string, response []byte) (addr basics.Address, err error) {
var rs netPrioResponseSigned
err = protocol.Decode(response, &rs)
if err != nil {
return
}
if rs.Response.Nonce != challenge {
err = fmt.Errorf("challenge/response mismatch")
return
}
balanceRound := rs.Round.SubSaturate(2)
proto, err := node.ledger.ConsensusParams(balanceRound)
if err != nil {
return
}
data, err := node.ledger.LookupAgreement(balanceRound, rs.Sender)
if err != nil {
return
}
ephID := basics.OneTimeIDForRound(rs.Round, data.KeyDilution(proto))
if !data.VoteID.Verify(ephID, rs.Response, rs.Sig) {
err = fmt.Errorf("signature verification failure")
return
}
addr = rs.Sender
return
}
// GetPrioWeight implements the network.NetPrioScheme interface
func (node *AlgorandFullNode) GetPrioWeight(addr basics.Address) uint64 {
latest := node.ledger.LastRound()
data, err := node.ledger.LookupAgreement(latest, addr)
if err != nil {
return 0
}
return data.MicroAlgosWithRewards.ToUint64()
}
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