arc/keymaster/proto/key_data.proto

// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto3";

package arc.keymaster.context;

// Standard ARC++ key material.
message ArcKeyData {
  // Blob containing the actual key material.
  bytes key_material = 1;
}

// Metadata holder for keys owned by chaps.
message ChapsKeyData {
  // PKCS#11 ID (CKA_ID).
  bytes id = 1;
  // PKCS#11 label (CKA_LABEL).
  string label = 2;

  // The possible chaps slots a key can be stored in. Note this does NOT map to
  // the PKCS#11 CK_SLOT_ID, but rather to an abstract representation of the
  // value. The corresponding CK_SLOT_ID must be queried from cryptohome.
  //
  // Note this must be kept in sync with mojo/cert_store.mojom and with the
  // ContextAdaptor::Slot enum.
  enum Slot {
    // The key is stored in the user slot.
    USER = 0;
    // The key is stored in the system slot.
    SYSTEM = 1;
  }
  // The chaps slot where this key is stored.
  Slot slot = 3;
}

// Extensible structure for key data from diverse sources.
message KeyData {
  // Sets of Keymaster tags.
  bytes hw_enforced_tags = 1;
  bytes sw_enforced_tags = 2;

  // Source-specific key data.
  oneof data {
    // Data for ARC++ KeyStore keys.
    ArcKeyData arc_key = 3;
    // Data for chaps owned keys.
    ChapsKeyData chaps_key = 4;
  }
}