attestation.proto

// Copyright (c) 2012 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.

package cryptohome;

// Holds TPM credentials that the attestation server will need to see. These
// credentials must be cleared once the attestation server has certified the
// AIK.
message TPMCredentials {
  optional bytes endorsement_public_key = 1;
  optional bytes endorsement_credential = 2;
  optional bytes platform_credential = 3;
  optional bytes conformance_credential = 4;
}

// Holds information relevant to a particular AIK.
message IdentityKey {
  // The DER encoded public key.
  optional bytes identity_public_key = 1;
  // The TPM-specific key blob that can be loaded back into the TPM.
  optional bytes identity_key_blob = 2;
  // A credential issued by the attestation server.
  optional bytes identity_credential = 3;
}

// Holds information required to verify the binding of an AIK to an EK. This
// information should be cleared once the attestation server has certified the
// AIK.
message IdentityBinding {
  // The binding data, as output by the TPM_MakeIdentity operation.
  optional bytes identity_binding = 1;
  // The AIK public key, DER encoded.
  optional bytes identity_public_key_der = 2;
  // The AIK public key, in TPM_PUBKEY form.
  optional bytes identity_public_key = 3;
  // The label used during AIK creation.
  optional bytes identity_label = 4;
  // The PCA public key used during AIK creation, in TPM_PUBKEY form.
  optional bytes pca_public_key = 5;
}

// Holds information about a quote generated by the TPM.
message Quote {
  // The quote; a signature generated with the AIK.
  optional bytes quote = 1;
  // The serialized data that was quoted; this assists in verifying the quote.
  optional bytes quoted_data = 2;
  // The value of the PCR(s) at the time the quote was generated.
  optional bytes quoted_pcr_value = 3;
}

// Holds owner delegation information.
message Delegation {
  // The delegate owner blob.
  optional bytes blob = 1;
  // The authorization secret.
  optional bytes secret = 2;
}

// This message holds all information to be sent to the attestation server in
// order to complete enrollment.
message AttestationEnrollmentRequest {
  // The EK cert, in X.509 form.
  optional bytes endorsement_credential = 1;
  // The AIK public key, in TPM_PUBKEY form.
  optional bytes identity_public_key = 2;
  // PCR0 quoted by AIK.
  optional Quote pcr0_quote = 3;
}

// These two fields are sutible for passing to Tspi_TPM_ActivateIdentity()
// directly.
message EncryptedIdentityCredential {
  // TPM_ASYM_CA_CONTENTS, encrypted with EK public key.
  optional bytes asym_ca_contents = 1;
  // TPM_SYM_CA_ATTESTATION, encrypted with the key in aysm_ca_contents.
  optional bytes sym_ca_attestation = 2;
}

enum ResponseStatus {
  OK = 0;
  // Internal server error.
  SERVER_ERROR = 1;
  // The server cannot parse the request.
  BAD_REQUEST = 2;
  // The server rejects the request.
  REJECT = 3;
}

// The response from the attestation server.
message AttestationEnrollmentResponse {
  optional ResponseStatus status = 1;
  // Detail response message. Included when the result is not OK.
  optional string detail = 2;
  optional EncryptedIdentityCredential encrypted_identity_credential = 3;
}

// Holds all information that a client stores locally.
message AttestationDatabase {
  optional TPMCredentials credentials = 2;
  optional IdentityBinding identity_binding = 3;
  optional IdentityKey identity_key = 4;
  optional Quote pcr0_quote = 5;
  optional Delegation delegate = 6;
}

// Holds encrypted data and information required to decrypt it.
message EncryptedDatabase {
  // A key that has been sealed to the TPM.
  optional bytes sealed_key = 2;
  // The initialization vector used during encryption.
  optional bytes iv = 3;
  // MAC of (iv || encrypted_data).
  optional bytes mac = 4;
  optional bytes encrypted_data = 5;
}