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https://github.com/ethereum/go-ethereum.git
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85 lines
3.1 KiB
Go
85 lines
3.1 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package light
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import (
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"math/rand"
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"github.com/ethereum/go-ethereum/beacon/light/types"
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"github.com/ethereum/go-ethereum/beacon/params"
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"github.com/ethereum/go-ethereum/common"
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)
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// syncCommittee holds either a blsSyncCommittee or a fake dummySyncCommittee used for testing
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type syncCommittee interface{}
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// committeeSigVerifier verifies sync committee signatures (either proper BLS
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// signatures or fake signatures used for testing)
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type committeeSigVerifier interface {
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deserializeSyncCommittee(s *types.SerializedCommittee) (syncCommittee, error)
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verifySignature(committee syncCommittee, signedRoot common.Hash, aggregate *types.SyncAggregate) bool
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}
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// BLSVerifier implements committeeSigVerifier
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type BLSVerifier struct{}
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// deserializeSyncCommittee implements committeeSigVerifier
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func (BLSVerifier) deserializeSyncCommittee(s *types.SerializedCommittee) (syncCommittee, error) {
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return s.Deserialize()
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}
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// verifySignature implements committeeSigVerifier
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func (BLSVerifier) verifySignature(committee syncCommittee, signingRoot common.Hash, aggregate *types.SyncAggregate) bool {
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return committee.(*types.SyncCommittee).VerifySignature(signingRoot, aggregate)
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}
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type dummySyncCommittee [32]byte
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// dummyVerifier implements committeeSigVerifier
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type dummyVerifier struct{}
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// deserializeSyncCommittee implements committeeSigVerifier
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func (dummyVerifier) deserializeSyncCommittee(s *types.SerializedCommittee) (syncCommittee, error) {
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var sc dummySyncCommittee
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copy(sc[:], s[:32])
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return sc, nil
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}
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// verifySignature implements committeeSigVerifier
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func (dummyVerifier) verifySignature(committee syncCommittee, signingRoot common.Hash, aggregate *types.SyncAggregate) bool {
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return aggregate.Signature == makeDummySignature(committee.(dummySyncCommittee), signingRoot, aggregate.BitMask)
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}
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func randomDummySyncCommittee() dummySyncCommittee {
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var sc dummySyncCommittee
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rand.Read(sc[:])
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return sc
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}
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func serializeDummySyncCommittee(sc dummySyncCommittee) *types.SerializedCommittee {
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s := new(types.SerializedCommittee)
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copy(s[:32], sc[:])
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return s
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}
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func makeDummySignature(committee dummySyncCommittee, signingRoot common.Hash, bitmask [params.SyncCommitteeBitmaskSize]byte) (sig [params.BlsSignatureSize]byte) {
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for i, b := range committee[:] {
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sig[i] = b ^ signingRoot[i]
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}
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copy(sig[32:], bitmask[:])
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return
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}
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