go-attestation/proto/tpm.proto

syntax = "proto3";

package go_attestation;

enum TpmVersion {
  TPM_VERSION_UNSPECIFIED = 0;
  TPM_12 = 1;
  TPM_20 = 2;
}

enum TpmInterface {
  TPM_INTERFACE_UNSPECIFIED = 0;
  DIRECT = 1;
  KERNEL_MANAGED = 2;
  DAEMON_MANAGED = 3;
}

// TpmInfo encapsulates version / device information
// about the TPM, and how the attestation client interfaces
// with it.
message TpmInfo {
  TpmVersion tpm_version = 1;
  string manufacturer = 2;
  TpmInterface tpm_interface = 3;

  // This number represents the version of the support code which
  // interfaces with the TPM.
  uint32 tpm_interface_version = 4 [deprecated = true];

  // This is the string provided by the TPM.
  string tpm_opaque_info = 5;

  // This is set if challenges must be generated
  // in TrouSerS format for TPM 1.2 devices.
  bool trousers_format = 6;
}

message EndorsementKey {
  enum DataType {
    DATA_TYPE_UNSPECIFIED = 0;
    PUBLIC_BLOB = 1;  // Indicates data is encoded as a PKCS1 public key.
    X509_CERT_BLOB = 2;
  };

  DataType datatype = 1;
  bytes data = 2;
}

// Tpm20AikInfo describes an AIK using TPM 2.0 structures.
message Tpm20AikInfo {
  // This is a TPMT_PUBLIC structure.
  bytes public_blob = 1;
  // This is a TPMS_CREATION_DATA structure.
  bytes creation_data = 2;
  // This is a TPMU_ATTEST structure, with the dynamic section
  // containing a CREATION_INFO structure.
  bytes attestation_data = 3;
  // This is a TPMT_SIGNATURE structure.
  bytes signature_data = 4;
}

// Tpm12AikInfo describes an AIK using TPM 1.2 structures.
message Tpm12AikInfo {
  // This is a TPM_PUBKEY structure.
  bytes public_blob = 1;
  // This is auxillary data, provided for the purpose of debugging.
  // on Windows devices, this represents the contents of PCP_ID_BINDING.
  bytes aux = 2;
}

// AikInfo describes the public key, parameters, and creation information
// of an attestation identity key.
message AikInfo {
  oneof tpm_aik_info {
    Tpm20AikInfo tpm20 = 1;
    Tpm12AikInfo tpm12 = 2;
  }
}

// ChallengeInfo describes which challenge a nonce corresponds to.
message ChallengeInfo {
  enum ChallengeType {
    CHALLENGE_UNSPECIFIED = 0;
    CHALLENGE_CA = 1;
  };

  ChallengeType type = 1;
}