var spk asn1.BitString
	if !spki.ReadASN1BitString(&spk) {
		return nil, errors.New("x509: malformed subjectPublicKey")
	}
	if cert.PublicKeyAlgorithm != UnknownPublicKeyAlgorithm {
		cert.PublicKey, err = parsePublicKey(&publicKeyInfo{
			Algorithm: pkAI,
			PublicKey: spk,
		})
		if err != nil {
			return nil, err
		}
	}

	if cert.Version > 1 {