79 lines
1.6 KiB
Go
79 lines
1.6 KiB
Go
// Package timestamp implements the timestamp protocol rfc 3161
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package timestamp
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import (
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"crypto"
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"crypto/x509"
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"time"
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asn1 "github.com/InfiniteLoopSpace/go_S-MIME/asn1"
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cms "github.com/InfiniteLoopSpace/go_S-MIME/cms/protocol"
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oid "github.com/InfiniteLoopSpace/go_S-MIME/oid"
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)
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const (
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contentTypeTSQuery = "application/timestamp-query"
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contentTypeTSReply = "application/timestamp-reply"
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nonceBytes = 16
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)
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var (
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//Opts are options for timestamp certificate verficiation.
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Opts = x509.VerifyOptions{
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Intermediates: x509.NewCertPool(),
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CurrentTime: time.Now(),
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KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageTimeStamping},
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}
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)
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// FetchTSToken tries to fetch a TSTokem of the given msg with hash using the given URL.
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func FetchTSToken(url string, msg []byte, hash crypto.Hash) (tsToken cms.ContentInfo, err error) {
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req, err := newTSRequest(msg, hash)
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if err != nil {
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return
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}
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resp, err := req.Do(url)
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if err != nil {
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return
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}
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if err = resp.Status.GetError(); err != nil {
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return
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}
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sd, err := resp.TimeStampToken.SignedDataContent()
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if err != nil {
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return
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}
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_, err = sd.Verify(Opts, nil)
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return resp.TimeStampToken, err
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}
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// VerfiyTS verfies the given TSToken and returns the TSTInfo.
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func VerfiyTS(ci cms.ContentInfo) (info TSTInfo, err error) {
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if !ci.ContentType.Equal(oid.SignedData) {
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err = cms.ErrUnsupported
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return
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}
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sd := cms.SignedData{}
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_, err = asn1.Unmarshal(ci.Content.Bytes, &sd)
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if err != nil {
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return
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}
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_, err = sd.Verify(Opts, nil)
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if err != nil {
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return
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}
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info, err = ParseInfo(sd.EncapContentInfo)
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return
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}
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