code: func (k *revocationPublicKey) Bytes() (raw []byte, err error) {
  	raw, err = x509.MarshalPKIXPublicKey(k.pubKey)
  	if err != nil {
  		return nil, fmt.Errorf("Failed marshalling key [%s]", err)
  	}
  	return
  }
docs: // Bytes converts this key to its byte representation,
  // if this operation is allowed.