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signer.go
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signer.go
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// Copyright 2020 Anapaya Systems
//
// 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 trust
import (
"context"
"github.com/scionproto/scion/pkg/private/serrors"
cryptopb "github.com/scionproto/scion/pkg/proto/crypto"
"github.com/scionproto/scion/private/trust"
)
// SignerGen generates signers.
type SignerGen interface {
Generate(ctx context.Context) (trust.Signer, error)
}
// RenewingSigner is a signer that automatically picks up new key/cert material.
type RenewingSigner struct {
SignerGen SignerGen
}
// Sign signs the message with the latest available Signer.
func (s RenewingSigner) Sign(
ctx context.Context,
msg []byte,
associatedData ...[]byte,
) (*cryptopb.SignedMessage, error) {
signer, err := s.SignerGen.Generate(ctx)
if err != nil {
return nil, serrors.WrapStr("failed to generate signer", err)
}
return signer.Sign(ctx, msg, associatedData...)
}
// SignCMS signs the message with the latest available Signer.
func (s RenewingSigner) SignCMS(ctx context.Context, msg []byte) ([]byte, error) {
signer, err := s.SignerGen.Generate(ctx)
if err != nil {
return nil, serrors.WrapStr("failed to generate signer", err)
}
return signer.SignCMS(ctx, msg)
}