100 lines
3.4 KiB
Go
100 lines
3.4 KiB
Go
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package timestamp
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import (
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"crypto/x509/pkix"
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"encoding/asn1"
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"math/big"
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"time"
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asn "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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// TSTInfo ::= SEQUENCE {
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// version INTEGER { v1(1) },
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// policy TSAPolicyId,
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// messageImprint MessageImprint,
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// -- MUST have the same value as the similar field in
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// -- TimeStampReq
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// serialNumber INTEGER,
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// -- Time-Stamping users MUST be ready to accommodate integers
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// -- up to 160 bits.
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// genTime GeneralizedTime,
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// accuracy Accuracy OPTIONAL,
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// ordering BOOLEAN DEFAULT FALSE,
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// nonce INTEGER OPTIONAL,
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// -- MUST be present if the similar field was present
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// -- in TimeStampReq. In that case it MUST have the same value.
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// tsa [0] GeneralName OPTIONAL,
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// extensions [1] IMPLICIT Extensions OPTIONAL }
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type TSTInfo struct {
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Version int
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Policy asn1.ObjectIdentifier
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MessageImprint MessageImprint
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SerialNumber *big.Int
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GenTime time.Time `asn1:"generalized"`
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Accuracy Accuracy `asn1:"optional"`
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Ordering bool `asn1:"optional,default:false"`
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Nonce *big.Int `asn1:"optional"`
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TSA asn1.RawValue `asn1:"tag:0,optional"`
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Extensions []pkix.Extension `asn1:"tag:1,optional"`
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}
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// ParseInfo parses an Info out of a CMS EncapsulatedContentInfo.
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func ParseInfo(enci cms.EncapsulatedContentInfo) (TSTInfo, error) {
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i := TSTInfo{}
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if !enci.EContentType.Equal(oid.TSTInfo) {
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return i, cms.ErrWrongType
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}
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if rest, err := asn.Unmarshal(enci.EContent, &i); err != nil {
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return i, err
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} else if len(rest) > 0 {
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return i, cms.ErrTrailingData
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}
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return i, nil
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}
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// Before checks if the latest time the signature could have been generated at
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// is before the specified time. For example, you might check that a signature
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// was made *before* a certificate's not-after date.
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func (i *TSTInfo) Before(t time.Time) bool {
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return i.genTimeMax().Before(t)
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}
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// After checks if the earlier time the signature could have been generated at
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// is before the specified time. For example, you might check that a signature
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// was made *after* a certificate's not-before date.
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func (i *TSTInfo) After(t time.Time) bool {
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return i.genTimeMin().After(t)
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}
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// genTimeMax is the latest time at which the token could have been generated
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// based on the included GenTime and Accuracy attributes.
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func (i *TSTInfo) genTimeMax() time.Time {
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return i.GenTime.Add(i.Accuracy.Duration())
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}
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// genTimeMin is the earliest time at which the token could have been generated
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// based on the included GenTime and Accuracy attributes.
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func (i *TSTInfo) genTimeMin() time.Time {
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return i.GenTime.Add(-i.Accuracy.Duration())
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}
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// Accuracy of the timestamp
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type Accuracy struct {
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Seconds int `asn1:"optional"`
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Millis int `asn1:"tag:0,optional"`
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Micros int `asn1:"tag:1,optional"`
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}
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// Duration returns this Accuracy as a time.Duration.
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func (a Accuracy) Duration() time.Duration {
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return 0 +
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time.Duration(a.Seconds)*time.Second +
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time.Duration(a.Millis)*time.Millisecond +
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time.Duration(a.Micros)*time.Microsecond
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}
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