//ReadAttributeHeader read the header of the attributes.
func ReadAttributeHeader(tcert *x509.Certificate, headerKey []byte) (map[string]int, bool, error) {
var err error
var headerRaw []byte
encrypted := false
if headerRaw, err = utils.GetCriticalExtension(tcert, TCertAttributesHeaders); err != nil {
return nil, encrypted, err
}
headerStr := string(headerRaw)
var header map[string]int
header, err = ParseAttributesHeader(headerStr)
if err != nil {
if headerKey == nil {
return nil, false, errors.New("Is not possible read an attribute encrypted without the headerKey")
}
headerRaw, err = DecryptAttributeValue(headerKey, headerRaw)
if err != nil {
return nil, encrypted, errors.New("error decrypting header value '" + err.Error() + "''")
}
headerStr = string(headerRaw)
header, err = ParseAttributesHeader(headerStr)
if err != nil {
return nil, encrypted, err
}
encrypted = true
}
return header, encrypted, nil
}
//ReadTCertAttributeByPosition read the attribute stored in the position "position" of the tcert.
func ReadTCertAttributeByPosition(tcert *x509.Certificate, position int) ([]byte, error) {
if position <= 0 {
return nil, fmt.Errorf("Invalid attribute position. Received [%v]", position)
}
oid := asn1.ObjectIdentifier{1, 2, 3, 4, 5, 6, 9 + position}
value, err := utils.GetCriticalExtension(tcert, oid)
if err != nil {
return nil, err
}
return value, nil
}