/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto3";

package nugget.app.keymaster;

import "nugget/app/keymaster/keymaster_defs.proto";
import "nugget/app/keymaster/keymaster_types.proto";
import "nugget/protobuf/options.proto";

/*
 * Keymaster service methods.
 *
 * TODO: some methods may be implemented in the host side HAL implementation.
 */
service Keymaster {
  option (nugget.protobuf.app_id) = "KEYMASTER";
  option (nugget.protobuf.app_name) = "Keymaster";
  option (nugget.protobuf.app_version) = 1;
  /*
   * Both request and response buffers are sized such
   * that a key-blob may be fully contained.
   *
   * TODO: revisit this choice in the event that memory
   * is running out.  Supporting smaller buffers will
   * require that the keymaster app switch from the
   * transport API to the datagram API.
   */
  option (nugget.protobuf.request_buffer_size) = 3072;
  option (nugget.protobuf.response_buffer_size) = 2048;

  /*
   * KM3 methods, from:
   *     ::android::hardware::keymaster::V3_0::IKeymasterDevice
   */
  rpc AddRngEntropy (AddRngEntropyRequest) returns (AddRngEntropyResponse);
  rpc GenerateKey (GenerateKeyRequest) returns (GenerateKeyResponse);
  rpc GetKeyCharacteristics (GetKeyCharacteristicsRequest) returns (GetKeyCharacteristicsResponse);
  rpc ImportKey (ImportKeyRequest) returns (ImportKeyResponse);
  rpc ExportKey (ExportKeyRequest) returns (ExportKeyResponse);
  rpc StartAttestKey (StartAttestKeyRequest) returns (StartAttestKeyResponse);
  rpc UpgradeKey (UpgradeKeyRequest) returns (UpgradeKeyResponse);
  rpc DeleteKey (DeleteKeyRequest) returns (DeleteKeyResponse);
  rpc DeleteAllKeys (DeleteAllKeysRequest) returns (DeleteAllKeysResponse);
  rpc DestroyAttestationIds (DestroyAttestationIdsRequest) returns (DestroyAttestationIdsResponse);
  rpc BeginOperation (BeginOperationRequest) returns (BeginOperationResponse);
  rpc UpdateOperation (UpdateOperationRequest) returns (UpdateOperationResponse);
  rpc FinishOperation (FinishOperationRequest) returns (FinishOperationResponse);
  rpc AbortOperation (AbortOperationRequest) returns (AbortOperationResponse);

  /*
   * KM4 methods.
   */
  rpc ImportWrappedKey (ImportWrappedKeyRequest) returns (ImportKeyResponse);

  /*
   * Vendor specific methods (bootloader, manufacturing, status,
   * factory reset, upgrade).
   */
  // Only callable by the Bootloader.
  rpc SetRootOfTrust (SetRootOfTrustRequest) returns (SetRootOfTrustResponse);
  // Only callable by the Bootloader.
  rpc SetBootState (SetBootStateRequest) returns (SetBootStateResponse);
  // Only callable at the Device Factory.
  rpc ProvisionDeviceIds (ProvisionDeviceIdsRequest) returns (ProvisionDeviceIdsResponse);
  // Only callable at the Device Factory.
  rpc ReadTeeBatchCertificate (ReadTeeBatchCertificateRequest) returns (ReadTeeBatchCertificateResponse);

  /*
   * More KM4 methods.
   */
  rpc GetHmacSharingParameters (GetHmacSharingParametersRequest) returns (GetHmacSharingParametersResponse);
  rpc ComputeSharedHmac (ComputeSharedHmacRequest) returns (ComputeSharedHmacResponse);

  /*
   * DTup input session methods.
   */
  rpc HandshakeDTup (DTupHandshakeRequest) returns (DTupHandshakeResponse);
  rpc FetchDTupInputEvent (DTupFetchInputEventRequest) returns (DTupFetchInputEventResponse);

  /*
   * More vendor specific methods.
   */
  // Only callable once per boot.
  rpc SetSystemVersionInfo (SetSystemVersionInfoRequest) returns (SetSystemVersionInfoResponse);
  rpc GetBootInfo (GetBootInfoRequest) returns (GetBootInfoResponse);

  /*
   * Called during provisioning by the CitadelProvision tool.
   */
  rpc ProvisionPresharedSecret (ProvisionPresharedSecretRequest) returns (ProvisionPresharedSecretResponse);

  /*
   * Additional attestation methods.
   */
  rpc ContinueAttestKey(ContinueAttestKeyRequest) returns (ContinueAttestKeyResponse);
  rpc FinishAttestKey(FinishAttestKeyRequest) returns (FinishAttestKeyResponse);

  // These are implemented with a enum, so new RPCs must be appended, and
  // deprecated RPCs need placeholders.
}

/*
 *  KM3 messages.
 */

// AddEntropy
message AddRngEntropyRequest {
  bytes data = 1;
}
message AddRngEntropyResponse {
  ErrorCode error_code = 1;
}

// GenerateKey
message GenerateKeyRequest {
  KeyParameters params = 1;
}
message GenerateKeyResponse {
  ErrorCode error_code = 1;
  KeyBlob blob = 2;
  KeyCharacteristics characteristics = 3;
}

// GetKeyCharacteristics
message GetKeyCharacteristicsRequest {
  KeyBlob blob = 1;
  bytes client_id = 2;
  bytes app_data = 3;
}
message GetKeyCharacteristicsResponse {
  ErrorCode error_code = 1;
  KeyCharacteristics characteristics = 2;
}

// ImportKey
message ImportKeyRequest {
  KeyParameters params = 1;
  RSAKey rsa = 2;
  ECKey ec = 3;
  SymmetricKey symmetric_key = 4;
};
message ImportKeyResponse {
  ErrorCode error_code = 1;
  KeyBlob blob = 2;
  KeyCharacteristics characteristics = 3;
};

// ExportKey
message ExportKeyRequest {
  KeyFormat format = 1;
  KeyBlob blob = 2;
  bytes client_id = 3;
  bytes app_data = 4;
};
message ExportKeyResponse {
  ErrorCode error_code = 1;
  Algorithm algorithm = 2;
  RSAKey rsa = 3;
  ECKey ec = 4;
};

// StartAttestKey
message StartAttestKeyRequest {
  KeyBlob blob = 1;
  KeyParameters params = 2;
  uint32 attestation_app_id_len = 3;
  AttestationSelector selector = 4;
  bytes not_before = 5;      // strftime('%y%m%d%H%M%SZ') [13 octects]
  bytes not_after = 6;       // strftime('%y%m%d%H%M%SZ') [13 octects]
}
message StartAttestKeyResponse {
  ErrorCode error_code = 1;
  OperationHandle handle = 2;
  bytes certificate_prologue = 3;
}

// ContinueAttestKeyRequest
message ContinueAttestKeyRequest {
  OperationHandle handle = 1;
  bytes attestation_app_id = 2;
}
message  ContinueAttestKeyResponse {
  ErrorCode error_code = 1;
  bytes certificate_body = 2;
}

// FinishAttestKeyRequest
message FinishAttestKeyRequest {
  OperationHandle handle = 1;
}
message  FinishAttestKeyResponse {
  ErrorCode error_code = 1;
  bytes certificate_epilogue = 2;
}

// UpgradeKey
message UpgradeKeyRequest {
  KeyBlob blob = 1;
  KeyParameters params = 2;
}
message UpgradeKeyResponse {
  ErrorCode error_code = 1;
  KeyBlob blob = 2;
}

// DeleteKey
message DeleteKeyRequest {
  KeyBlob blob = 1;
}
message DeleteKeyResponse {
  ErrorCode error_code = 1;
}

// DeleteAllKeys
message DeleteAllKeysRequest {}
message DeleteAllKeysResponse {
  ErrorCode error_code = 1;
}

// DestroyAttestationIds
message DestroyAttestationIdsRequest {}
message DestroyAttestationIdsResponse {
  ErrorCode error_code = 1;
}

// BeginOperation
message BeginOperationRequest {
  KeyPurpose purpose = 1;
  KeyBlob blob = 2;
  KeyParameters params = 3;
  HardwareAuthToken auth_token = 4;
}
message BeginOperationResponse {
  ErrorCode error_code = 1;
  KeyParameters params = 2;
  OperationHandle handle = 3;
  Algorithm algorithm = 4;
  uint32 key_bits = 5;
}

// UpdateOperation
message UpdateOperationRequest {
  OperationHandle handle = 1;
  KeyParameters params = 2;
  bytes input = 3;
  HardwareAuthToken auth_token = 4;
  VerificationToken verification_token = 5;
}
message UpdateOperationResponse {
  ErrorCode error_code = 1;
  uint32 consumed = 2;
  KeyParameters params = 3;
  bytes output = 4;
}

// FinishOperation
message FinishOperationRequest {
  OperationHandle handle = 1;
  KeyParameters params = 2;
  bytes input = 3;
  bytes signature = 4;
  HardwareAuthToken auth_token = 5;
  VerificationToken verification_token = 6;
};
message FinishOperationResponse {
  ErrorCode error_code = 1;
  KeyParameters params = 2;
  bytes output = 3;
};

// AbortOperation
message AbortOperationRequest {
  OperationHandle handle = 1;
};
message AbortOperationResponse {
  ErrorCode error_code = 1;
};

/*
 * KM4 messages.
 */

// ImportWrappedKey
message ImportWrappedKeyRequest {
  uint32 key_format = 1;
  KeyParameters params = 2;
  bytes rsa_envelope = 3;
  bytes initialization_vector = 4;   // Fixed sized array.
  bytes encrypted_import_key = 5;
  bytes aad = 6;
  bytes gcm_tag = 7;                 // Fixed sized array.
  KeyBlob wrapping_key_blob = 8;
  bytes masking_key = 9;             // Fixed sized array.
}
// ImportWrappedKey returns a ImportKeyResponse.

// GetHmacSharingParametersRequest
message GetHmacSharingParametersRequest {
}
message GetHmacSharingParametersResponse {
  ErrorCode error_code = 1;
  HmacSharingParameters hmac_sharing_params = 2;
}

// ComputeSharedHmacRequest
message ComputeSharedHmacRequest {
  repeated HmacSharingParameters hmac_sharing_params = 1;
}
message ComputeSharedHmacResponse {
  ErrorCode error_code = 1;
  bytes sharing_check = 2;
}

/*
 * Vendor HAL.
 */

// SetRootOfTrustRequest
// Only callable by the Bootloader.
message SetRootOfTrustRequest {
  bytes digest = 1;                  // This is a SHA256 digest.
}
message SetRootOfTrustResponse {
  // Specified in keymaster_defs.proto:ErrorCode
  ErrorCode error_code = 1;
}

// SetBootStateRequest
// Only callable by the Bootloader.
message SetBootStateRequest {
  bool is_unlocked = 1;
  bytes public_key = 2;              // This is a SHA256 digest.
  BootColor color = 3;
  uint32 system_version = 4;
  uint32 system_security_level = 5;
  bytes boot_hash = 6;               // This is a SHA256 digest.
}
message SetBootStateResponse {
  // Specified in keymaster_defs.proto:ErrorCode
  ErrorCode error_code = 1;
}

// ProvisionDeviceIds
// Only callable at the Device Factory
message ProvisionDeviceIdsRequest {
  bytes product_brand = 1;
  bytes product_device = 2;
  bytes product_name = 3;
  bytes serialno = 4;
  bytes product_manufacturer = 5;
  bytes product_model = 6;
  bytes imei = 7;
  bytes meid = 8;
}
message ProvisionDeviceIdsResponse {
  // Specified in keymaster_defs.proto:ErrorCode
  ErrorCode error_code = 1;
}

// ReadTeeBatchCertificate
// Only callable at the Device Factory
message ReadTeeBatchCertificateRequest {
  Algorithm algorithm = 1;
}
message ReadTeeBatchCertificateResponse {
  ErrorCode error_code = 1;
  RSAKey rsa = 2;   // rsa or ec set based on request algorithm selector.
  ECKey ec = 3;
  bytes batch_cert = 4;
}

message DTupHandshakeRequest {
  bytes nonce_client = 1;
}

message DTupHandshakeResponse {
  DTupError error_code = 1;
  bytes nonce_citadel = 2;
  bytes signature = 3;
}

message DTupFetchInputEventRequest {}

message DTupFetchInputEventResponse {
  DTupError error_code = 1;
  DTupKeyEvent event = 2;
  bytes signature = 3;
}

message SetSystemVersionInfoRequest {
  uint32 system_version = 1;  // getprop "ro.build.version.release"
  uint32 system_security_level = 2; // getprop "ro.build.version.security_patch"
  uint32 vendor_security_level = 3; // getprop "ro.vendor.build.security_patch"
}

message SetSystemVersionInfoResponse {
  // Specified in keymaster_defs.proto:ErrorCode
  ErrorCode error_code = 1;
}

message GetBootInfoRequest {}

message GetBootInfoResponse {
  ErrorCode error_code = 1;
  bool is_unlocked = 2;
  BootColor boot_color = 3;
  bytes boot_key = 4;               // This is a SHA256 digest.
  bytes boot_hash = 5;              // This is a SHA256 digest.
}

message ProvisionPresharedSecretRequest {
  bytes preshared_secret = 1;
  bool get_status = 2;
}
message ProvisionPresharedSecretResponse {
  ErrorCode error_code = 1;
  PresharedSecretStatus status = 2;
}