56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
// Package protocol implemets parts of cryptographic message syntax RFC 5652.
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// This package is mostly for handling of the asn1 sturctures of cms. For
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// de/encryption and signing/verfiying use to package cms.
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package protocol
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import (
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"encoding/asn1"
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"fmt"
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asn "git.ma-al.com/goc_marek/go_S-MIME/asn1"
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"git.ma-al.com/goc_marek/go_S-MIME/b64"
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)
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// ContentInfo ::= SEQUENCE {
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// contentType ContentType,
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// content [0] EXPLICIT ANY DEFINED BY contentType }
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//
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// ContentType ::= OBJECT IDENTIFIER
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type ContentInfo struct {
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ContentType asn1.ObjectIdentifier
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Content asn1.RawValue `asn1:"explicit,tag:0"`
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}
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// ParseContentInfo parses DER-encoded ASN.1 data and returns ContentInfo.
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func ParseContentInfo(der []byte) (ci ContentInfo, err error) {
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if err != nil {
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return
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}
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var rest []byte
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if rest, err = asn.Unmarshal(der, &ci); err != nil {
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return
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}
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if len(rest) > 0 {
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fmt.Println(ErrTrailingData)
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//err = ErrTrailingData
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}
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return
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}
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// DER returns the DER-encoded ASN.1 data.
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func (ci ContentInfo) DER() ([]byte, error) {
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return asn.Marshal(ci)
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}
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// Base64 encodes the DER-encoded ASN.1 data in base64 for use in S/MIME.
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func (ci ContentInfo) Base64() ([]byte, error) {
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der, err := ci.DER()
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if err != nil {
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return nil, err
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}
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return b64.EncodeBase64(der)
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}
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