/
signature.go
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/
signature.go
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// Copyright The Enterprise Contract Contributors
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package signature
import (
"encoding/hex"
"encoding/pem"
"github.com/sigstore/cosign/v2/pkg/oci"
)
type EntitySignature struct {
KeyID string `json:"keyid"`
Signature string `json:"sig"`
Certificate string `json:"certificate,omitempty"`
Chain []string `json:"chain,omitempty"`
Metadata map[string]string `json:"metadata,omitempty"`
}
// NewEntitySignature creates a new EntitySignature from the given Signature.
func NewEntitySignature(sig oci.Signature) (EntitySignature, error) {
es := EntitySignature{
Metadata: map[string]string{},
}
var err error
es.Signature, err = sig.Base64Signature()
if err != nil {
return EntitySignature{}, err
}
cert, err := sig.Cert()
if err != nil {
return EntitySignature{}, err
}
if cert != nil && len(cert.Raw) > 0 {
es.Certificate = string(pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}))
es.KeyID = hex.EncodeToString(cert.SubjectKeyId)
if err := addCertificateMetadataTo(&es.Metadata, cert); err != nil {
return EntitySignature{}, err
}
}
chain, err := sig.Chain()
if err != nil {
return EntitySignature{}, err
}
for _, c := range chain {
if len(c.Raw) == 0 {
continue
}
es.Chain = append(es.Chain, string(pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: c.Raw,
})))
}
return es, nil
}