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helpers.go
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/
helpers.go
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// Copyright © 2020 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/phase0"
"github.com/pkg/errors"
e2types "github.com/wealdtech/go-eth2-types/v2"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)
// sign signs a root, using protected methods if possible.
func (*Service) sign(ctx context.Context,
account e2wtypes.Account,
root phase0.Root,
domain phase0.Domain,
) (
phase0.BLSSignature,
error,
) {
var sig e2types.Signature
if protectingSigner, isProtectingSigner := account.(e2wtypes.AccountProtectingSigner); isProtectingSigner {
var err error
sig, err = protectingSigner.SignGeneric(ctx, root[:], domain[:])
if err != nil {
return phase0.BLSSignature{}, err
}
} else {
container := phase0.SigningData{
ObjectRoot: root,
Domain: domain,
}
root, err := container.HashTreeRoot()
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to generate hash tree root")
}
sig, err = account.(e2wtypes.AccountSigner).Sign(ctx, root[:])
if err != nil {
return phase0.BLSSignature{}, err
}
}
var signature phase0.BLSSignature
copy(signature[:], sig.Marshal())
return signature, nil
}