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signcontributonandproof.go
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signcontributonandproof.go
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// Copyright © 2021 Attestant Limited.
// 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 standard
import (
"context"
"github.com/attestantio/go-eth2-client/spec/altair"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/pkg/errors"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)
// SignContributionAndProof signs a sync committee contribution for given slot and root.
func (s *Service) SignContributionAndProof(ctx context.Context,
account e2wtypes.Account,
contributionAndProof *altair.ContributionAndProof,
) (
phase0.BLSSignature,
error,
) {
if s.contributionAndProofDomainType == nil {
return phase0.BLSSignature{}, errors.New("no contribution and proof domain type available; cannot sign")
}
root, err := contributionAndProof.HashTreeRoot()
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to calculate hash tree root")
}
// Calculate the domain.
epoch := phase0.Epoch(contributionAndProof.Contribution.Slot / s.slotsPerEpoch)
domain, err := s.domainProvider.Domain(ctx, *s.contributionAndProofDomainType, epoch)
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to obtain signature domain for contribution and proof")
}
sig, err := s.sign(ctx, account, root, domain)
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to sign contribution and proof")
}
return sig, nil
}