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sign_blob.go
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/
sign_blob.go
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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 sign
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
cbundle "github.com/sigstore/cosign/pkg/cosign/bundle"
"github.com/sigstore/cosign/cmd/cosign/cli/options"
"github.com/sigstore/cosign/cmd/cosign/cli/rekor"
"github.com/sigstore/cosign/pkg/cosign"
signatureoptions "github.com/sigstore/sigstore/pkg/signature/options"
)
// nolint
func SignBlobCmd(ro *options.RootOptions, ko options.KeyOpts, regOpts options.RegistryOptions, payloadPath string, b64 bool, outputSignature string, outputCertificate string) ([]byte, error) {
var payload []byte
var err error
var rekorBytes []byte
if payloadPath == "-" {
payload, err = io.ReadAll(os.Stdin)
} else {
fmt.Fprintln(os.Stderr, "Using payload from:", payloadPath)
payload, err = os.ReadFile(filepath.Clean(payloadPath))
}
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), ro.Timeout)
defer cancel()
sv, err := SignerFromKeyOpts(ctx, "", "", ko)
if err != nil {
return nil, err
}
defer sv.Close()
sig, err := sv.SignMessage(bytes.NewReader(payload), signatureoptions.WithContext(ctx))
if err != nil {
return nil, errors.Wrap(err, "signing blob")
}
signedPayload := cosign.LocalSignedPayload{}
if options.EnableExperimental() {
rekorBytes, err = sv.Bytes(ctx)
if err != nil {
return nil, err
}
rekorClient, err := rekor.NewClient(ko.RekorURL)
if err != nil {
return nil, err
}
entry, err := cosign.TLogUpload(ctx, rekorClient, sig, payload, rekorBytes)
if err != nil {
return nil, err
}
fmt.Fprintln(os.Stderr, "tlog entry created with index:", *entry.LogIndex)
signedPayload.Bundle = cbundle.EntryToBundle(entry)
}
// if bundle is specified, just do that and ignore the rest
if ko.BundlePath != "" {
signedPayload.Base64Signature = base64.StdEncoding.EncodeToString(sig)
signedPayload.Cert = base64.StdEncoding.EncodeToString(rekorBytes)
contents, err := json.Marshal(signedPayload)
if err != nil {
return nil, err
}
return []byte(signedPayload.Base64Signature), os.WriteFile(ko.BundlePath, contents, 0600)
}
if outputSignature != "" {
var bts = sig
if b64 {
bts = []byte(base64.StdEncoding.EncodeToString(sig))
}
if err := os.WriteFile(outputSignature, bts, 0600); err != nil {
return nil, errors.Wrap(err, "create signature file")
}
fmt.Printf("Signature wrote in the file %s\n", outputSignature)
} else {
if b64 {
sig = []byte(base64.StdEncoding.EncodeToString(sig))
fmt.Println(string(sig))
} else if _, err := os.Stdout.Write(sig); err != nil {
// No newline if using the raw signature
return nil, err
}
}
if outputCertificate != "" && len(rekorBytes) > 0 {
bts := rekorBytes
if b64 {
bts = []byte(base64.StdEncoding.EncodeToString(rekorBytes))
}
if err := os.WriteFile(outputCertificate, bts, 0600); err != nil {
return nil, errors.Wrap(err, "create certificate file")
}
fmt.Printf("Certificate wrote in the file %s\n", outputCertificate)
}
return sig, nil
}