absl::Status GenerateKeyPair()

in kmsp11/main/bridge.cc [900:946]
42 lines of code
8 McCabe index (conditional complexity)

absl::Status GenerateKeyPair(
    CK_SESSION_HANDLE hSession, CK_MECHANISM_PTR pMechanism,
    CK_ATTRIBUTE_PTR pPublicKeyTemplate, CK_ULONG ulPublicKeyAttributeCount,
    CK_ATTRIBUTE_PTR pPrivateKeyTemplate, CK_ULONG ulPrivateKeyAttributeCount,
    CK_OBJECT_HANDLE_PTR phPublicKey, CK_OBJECT_HANDLE_PTR phPrivateKey) {
  ASSIGN_OR_RETURN(Provider * provider, GetProvider());
  ASSIGN_OR_RETURN(std::shared_ptr<Session> session, GetSession(hSession));

  if (!pMechanism) {
    return NullArgumentError("pMechanism", SOURCE_LOCATION);
  }
  if (!phPublicKey) {
    return NullArgumentError("phPublicKey", SOURCE_LOCATION);
  }
  if (!phPrivateKey) {
    return NullArgumentError("phPrivateKey", SOURCE_LOCATION);
  }

  absl::Span<const CK_ATTRIBUTE> pub_attributes;
  if (ulPublicKeyAttributeCount > 0) {
    if (!pPublicKeyTemplate) {
      return NullArgumentError("pPublicKeyTemplate", SOURCE_LOCATION);
    }
    pub_attributes =
        absl::MakeConstSpan(pPublicKeyTemplate, ulPublicKeyAttributeCount);
  }

  absl::Span<const CK_ATTRIBUTE> prv_attributes;
  if (ulPrivateKeyAttributeCount > 0) {
    if (!pPrivateKeyTemplate) {
      return NullArgumentError("pPrivateKeyTemplate", SOURCE_LOCATION);
    }
    prv_attributes =
        absl::MakeConstSpan(pPrivateKeyTemplate, ulPrivateKeyAttributeCount);
  }

  ASSIGN_OR_RETURN(
      AsymmetricHandleSet handles,
      session->GenerateKeyPair(
          *pMechanism, pub_attributes, prv_attributes,
          provider->library_config().experimental_create_multiple_versions(),
          provider->library_config().allow_software_keys()));

  *phPublicKey = handles.public_key_handle;
  *phPrivateKey = handles.private_key_handle;
  return absl::OkStatus();
}