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//
// Copyright 2021 The Sigstore Authors.
//
// 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 dsse includes wrappers to support DSSE
package dsse
import (
"bytes"
"context"
"crypto"
"errors"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/sigstore/sigstore/pkg/signature/options"
)
// SignerAdapter wraps a `sigstore/signature.Signer`, making it compatible with `go-securesystemslib/dsse.Signer`.
type SignerAdapter struct {
SignatureSigner signature.Signer
Pub crypto.PublicKey
Opts []signature.SignOption
PubKeyID string
}
// Sign implements `go-securesystemslib/dsse.Signer`
func (a *SignerAdapter) Sign(ctx context.Context, data []byte) ([]byte, error) {
return a.SignatureSigner.SignMessage(bytes.NewReader(data), append(a.Opts, options.WithContext(ctx))...)
}
// Verify disabled `go-securesystemslib/dsse.Verifier`
func (a *SignerAdapter) Verify(_ context.Context, _, _ []byte) error {
return errors.New("Verify disabled")
}
// Public implements `go-securesystemslib/dsse.Verifier`
func (a *SignerAdapter) Public() crypto.PublicKey {
return a.Pub
}
// KeyID implements `go-securesystemslib/dsse.Verifier`
func (a SignerAdapter) KeyID() (string, error) {
return a.PubKeyID, nil
}
// VerifierAdapter wraps a `sigstore/signature.Verifier`, making it compatible with `go-securesystemslib/dsse.Verifier`.
type VerifierAdapter struct {
SignatureVerifier signature.Verifier
Pub crypto.PublicKey
PubKeyID string
}
// Verify implements `go-securesystemslib/dsse.Verifier`
func (a *VerifierAdapter) Verify(ctx context.Context, data, sig []byte) error {
return a.SignatureVerifier.VerifySignature(bytes.NewReader(sig), bytes.NewReader(data), options.WithContext(ctx))
}
// Public implements `go-securesystemslib/dsse.Verifier`
func (a *VerifierAdapter) Public() crypto.PublicKey {
return a.Pub
}
// KeyID implements `go-securesystemslib/dsse.Verifier`
func (a *VerifierAdapter) KeyID() (string, error) {
return a.PubKeyID, nil
}
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