cryptohome/signature_sealed_data.proto

// Copyright 2018 The Chromium 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 = "proto2";

package cryptohome;

// Container for the signature-sealed data, including the additional non-secret
// information required for unsealing.
message SignatureSealedData {
  // Data for the TPM 2.0 method based on the "TPM2_PolicySigned" feature.
  message Tpm2PolicySignedData {
    // DER-encoded blob of the X.509 Subject Public Key Info of the key that
    // should be used for unsealing.
    optional bytes public_key_spki_der = 1;

    // The secret blob, wrapped by the TPM's Storage Root Key.
    optional bytes srk_wrapped_secret = 2;

    // The signature scheme (TPM_ALG_ID) that should be used for unsealing.
    optional int32 scheme = 3;

    // The signature hash algorithm (TPM_ALG_ID) that should be used for
    // unsealing.
    optional int32 hash_alg = 4;

    // Indexes of Platform Configuration Registers that should be used for
    // constructing the TPM policy for unsealing. Note that the order of items
    // is relevant.
    repeated uint32 bound_pcr = 5;
  }

  // Data for the TPM 1.2 method based on the "Certified Migratable Key"
  // functionality.
  message Tpm12CertifiedMigratableKeyData {
    // DER-encoded blob of the X.509 Subject Public Key Info of the key that
    // should be used for unsealing.
    optional bytes public_key_spki_der = 1;

    // The blob of the Certified Migratable Key wrapped by the TPM's Storage
    // Root Key.
    optional bytes srk_wrapped_cmk = 2;

    // The TPM_PUBKEY blob of the Certified Migratable Key.
    optional bytes cmk_pubkey = 3;
  }

  // The union containing the data depending on the sealing method.
  oneof data {
    Tpm2PolicySignedData tpm2_policy_signed_data = 1;
    Tpm12CertifiedMigratableKeyData tpm12_certified_migratable_key_data = 2;
  }
}