*outPresent = present
	}
	if present && !s.ReadASN1(out, tag) {
		return false
	}
	return true
}

// SkipOptionalASN1 advances s over an ASN.1 element with the given tag, or
// else leaves s unchanged. It reports whether the operation was successful.
func (s *String) SkipOptionalASN1(tag asn1.Tag) bool {
	if !s.PeekASN1Tag(tag) {
		return true
	}
	var unused String
	return s.ReadASN1(&unused, tag)
}

			Algorithm: pkAI,
			PublicKey: spk,
		})
		if err != nil {
			return nil, err
		}
	}

	if cert.Version > 1 {
		if !tbs.SkipOptionalASN1(cryptobyte_asn1.Tag(1).ContextSpecific()) {
			return nil, errors.New("x509: malformed issuerUniqueID")
		}
		if !tbs.SkipOptionalASN1(cryptobyte_asn1.Tag(2).ContextSpecific()) {
			return nil, errors.New("x509: malformed subjectUniqueID")
		}
		if cert.Version == 3 {