File: chaps_wrapped_key_info.proto

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// Copyright 2023 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package chaps;

// Proto for a key being wrapped with kChapsKeyWrapMechanism.
// Unwrapping Instructions:
// 1. Derive the actual wrapping key using the base_aes_key and Chaps' secret
//    random seed.
// 2. Use the derived key with CKM_AES_KEY_WRAP_KWP(([AES KEYWRAP] section 6.3))
//    to decrypt the wrapped_attribute_list.
message ChapsWrappedKeyInfo {
  // Base AES key used in the key derivation process. Along with Chaps' secret
  // random seed, it's used to generate a key specifically for actually
  // wrapping/unwrapping the key's attribute list.
  optional bytes base_aes_key = 1;
  // The encrypted attribute list of the key. This is wrapped using the derived
  // key (see base_aes_key comment) and the CKM_AES_KEY_WRAP_KWP mechanism.
  optional bytes wrapped_attribute_list = 2;
}