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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 authenticode
import (
"context"
"crypto"
"encoding/asn1"
"errors"
"github.com/sassoftware/relic/v7/lib/certloader"
"github.com/sassoftware/relic/v7/lib/pkcs7"
"github.com/sassoftware/relic/v7/lib/pkcs9"
"github.com/sassoftware/relic/v7/lib/x509tools"
)
type OpusParams struct {
Description string
URL string
}
func makePeIndirect(imprint []byte, hash crypto.Hash, oid asn1.ObjectIdentifier) (indirect SpcIndirectDataContentPe, err error) {
alg, ok := x509tools.PkixDigestAlgorithm(hash)
if !ok {
err = errors.New("unsupported digest algorithm")
return
}
indirect.Data.Type = oid
indirect.MessageDigest.Digest = imprint
indirect.MessageDigest.DigestAlgorithm = alg
indirect.Data.Value.File.File = NewSpcString("")
return
}
func signIndirect(ctx context.Context, indirect interface{}, hash crypto.Hash, cert *certloader.Certificate, params *OpusParams) (*pkcs9.TimestampedSignature, error) {
sig := pkcs7.NewBuilder(cert.Signer(), cert.Chain(), hash)
if err := sig.SetContent(OidSpcIndirectDataContent, indirect); err != nil {
return nil, err
}
if err := addOpusAttrs(sig, params); err != nil {
return nil, err
}
psd, err := sig.Sign()
if err != nil {
return nil, err
}
return pkcs9.TimestampAndMarshal(ctx, psd, cert.Timestamper, true)
}
func addOpusAttrs(sig *pkcs7.SignatureBuilder, params *OpusParams) error {
if err := sig.AddAuthenticatedAttribute(OidSpcStatementType, SpcSpStatementType{Type: OidSpcIndividualPurpose}); err != nil {
return err
}
var info SpcSpOpusInfo
if params != nil {
if params.Description != "" {
info.ProgramName = NewSpcString(params.Description)
}
if params.URL != "" {
info.MoreInfo.URL = params.URL
}
}
if err := sig.AddAuthenticatedAttribute(OidSpcSpOpusInfo, info); err != nil {
return err
}
return nil
}
func SignSip(ctx context.Context, imprint []byte, hash crypto.Hash, sipInfo SpcSipInfo, cert *certloader.Certificate, params *OpusParams) (*pkcs9.TimestampedSignature, error) {
alg, ok := x509tools.PkixDigestAlgorithm(hash)
if !ok {
return nil, errors.New("unsupported digest algorithm")
}
var indirect SpcIndirectDataContentMsi
indirect.Data.Type = OidSpcSipInfo
indirect.Data.Value = sipInfo
indirect.MessageDigest.Digest = imprint
indirect.MessageDigest.DigestAlgorithm = alg
return signIndirect(ctx, indirect, hash, cert, params)
}
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