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signer.go
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signer.go
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//
// Copyright (c) SAS Institute Inc.
//
// 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 cat
// Sign Microsoft security catalog files
import (
"errors"
"io"
"io/ioutil"
"github.com/sassoftware/relic/lib/authenticode"
"github.com/sassoftware/relic/lib/certloader"
"github.com/sassoftware/relic/lib/magic"
"github.com/sassoftware/relic/lib/pkcs7"
"github.com/sassoftware/relic/lib/pkcs9"
"github.com/sassoftware/relic/signers"
"github.com/sassoftware/relic/signers/pkcs"
)
var CatSigner = &signers.Signer{
Name: "cat",
Magic: magic.FileTypeCAT,
CertTypes: signers.CertTypeX509,
Sign: sign,
Verify: pkcs.Verify,
}
func init() {
signers.Register(CatSigner)
}
func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
blob, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
oldpsd, err := pkcs7.Unmarshal(blob)
if err != nil {
return nil, err
}
if !oldpsd.Content.ContentInfo.ContentType.Equal(authenticode.OidCertTrustList) {
return nil, errors.New("not a security catalog")
}
sig := pkcs7.NewBuilder(cert.Signer(), cert.Chain(), opts.Hash)
if err := sig.SetContentInfo(oldpsd.Content.ContentInfo); err != nil {
return nil, err
}
newpsd, err := sig.Sign()
if err != nil {
return nil, err
}
ts, err := pkcs9.TimestampAndMarshal(newpsd, cert.Timestamper, true)
if err != nil {
return nil, err
}
return opts.SetPkcs7(ts)
}