/**
 * Messages for TREZOR communication
 *
 * @author	Marek Palatinus <slush@satoshilabs.com>
 * @version	0.6
 */

// Sugar for easier handling in Java
option java_package = "com.satoshilabs.trezor.protobuf";
option java_outer_classname = "TrezorMessage";

import "types.proto";

/**
 * Mapping between Trezor wire identifier (uint) and a protobuf message
 */
enum MessageType {
	MessageType_Initialize = 0 [(wire_in) = true];
	MessageType_Ping = 1 [(wire_in) = true];
	MessageType_Success = 2 [(wire_out) = true];
	MessageType_Failure = 3 [(wire_out) = true];
	MessageType_ChangePin = 4 [(wire_in) = true];
	MessageType_WipeDevice = 5 [(wire_in) = true];
	MessageType_FirmwareErase = 6 [(wire_in) = true];
	MessageType_FirmwareUpload = 7 [(wire_in) = true];
	MessageType_GetEntropy = 9 [(wire_in) = true];
	MessageType_Entropy = 10 [(wire_out) = true];
	MessageType_GetPublicKey = 11 [(wire_in) = true];
	MessageType_PublicKey = 12 [(wire_out) = true];
	MessageType_LoadDevice = 13 [(wire_in) = true];
	MessageType_ResetDevice = 14 [(wire_in) = true];
	MessageType_SignTx = 15 [(wire_in) = true];
	MessageType_SimpleSignTx = 16 [(wire_in) = true];
	MessageType_Features = 17 [(wire_out) = true];
	MessageType_PinMatrixRequest = 18 [(wire_out) = true];
	MessageType_PinMatrixAck = 19 [(wire_in) = true];
	MessageType_Cancel = 20 [(wire_in) = true];
	MessageType_TxRequest = 21 [(wire_out) = true];
	MessageType_TxAck = 22 [(wire_in) = true];
	MessageType_ApplySettings = 25 [(wire_in) = true];
	MessageType_ButtonRequest = 26 [(wire_out) = true];
	MessageType_ButtonAck = 27 [(wire_in) = true];
	MessageType_GetAddress = 29 [(wire_in) = true];
	MessageType_Address = 30 [(wire_out) = true];
	MessageType_EntropyRequest = 35 [(wire_out) = true];
	MessageType_EntropyAck = 36 [(wire_in) = true];
	MessageType_SignMessage = 38 [(wire_in) = true];
	MessageType_VerifyMessage = 39 [(wire_in) = true];
	MessageType_MessageSignature = 40 [(wire_out) = true];
	MessageType_PassphraseRequest = 41 [(wire_out) = true];
	MessageType_PassphraseAck = 42 [(wire_in) = true];
	MessageType_EstimateTxSize = 43 [(wire_in) = true];
	MessageType_TxSize = 44 [(wire_out) = true];
	MessageType_RecoveryDevice = 45 [(wire_in) = true];
	MessageType_WordRequest = 46 [(wire_out) = true];
	MessageType_WordAck = 47 [(wire_in) = true];
	MessageType_DebugLinkDecision = 100 [(wire_debug_in) = true];
	MessageType_DebugLinkGetState = 101 [(wire_debug_in) = true];
	MessageType_DebugLinkState = 102 [(wire_debug_out) = true];
	MessageType_DebugLinkStop = 103 [(wire_debug_in) = true];
	MessageType_DebugLinkLog = 104 [(wire_debug_out) = true];
}

////////////////////
// Basic messages //
////////////////////

/**
 * Request: Reset device to default state and ask for device details
 * @next Features
 */
message Initialize {
}

/**
 * Response: Reports various information about the device
 * @prev Initialize
 */
message Features {
	optional string vendor = 1;			// name of the manufacturer, e.g. "bitcointrezor.com"
	optional uint32 major_version = 2;		// major version of the device, e.g. 1
	optional uint32 minor_version = 3;		// minor version of the device, e.g. 0
	optional uint32 patch_version = 4;		// patch version of the device, e.g. 0
	optional bool bootloader_mode = 5;		// is device in bootloader mode?
	optional string device_id = 6;			// device's unique identifier
	optional bool pin_protection = 7;		// is device protected by PIN?
	optional bool passphrase_protection = 8;	// is node/mnemonic encrypted using passphrase?
	optional string language = 9;			// device language
	optional string label = 10;			// device description label
	repeated CoinType coins = 11;			// supported coins
	optional bool initialized = 12;			// does device contain seed?
	optional bytes revision = 13;			// SCM revision of firmware
	optional bytes bootloader_hash = 14;		// hash of the bootloader
}

/**
 * Request: change language and/or label of the device
 * @next Success
 * @next Failure
 * @next ButtonRequest
 * @next PinMatrixRequest
 */
message ApplySettings {
	optional string language = 1;
	optional string label = 2;
}

/**
 * Request: Starts workflow for setting/changing/removing the PIN
 * @next ButtonRequest
 * @next PinMatrixRequest
 */
message ChangePin {
	optional bool remove = 1;	// is PIN removal requested?
}

/**
 * Request: Test if the device is alive, device sends back the message in Success response
 * @next Success
 */
message Ping {
	optional string message = 1;			// message to send back in Success message
	optional bool button_protection = 2;		// ask for button press
	optional bool pin_protection = 3;		// ask for PIN if set in device
	optional bool passphrase_protection = 4;	// ask for passphrase if set in device
}

/**
 * Response: Success of the previous request
 */
message Success {
	optional string message = 1;	// human readable description of action or request-specific payload
}

/**
 * Response: Failure of the previous request
 */
message Failure {
	optional FailureType code = 1;	// computer-readable definition of the error state
	optional string message = 2;	// human-readable message of the error state
}

/**
 * Response: Device is waiting for HW button press.
 * @next ButtonAck
 * @next Cancel
 */
message ButtonRequest {
	optional ButtonRequestType code = 1;
	optional string data = 2;
}

/**
 * Request: Computer agrees to wait for HW button press
 * @prev ButtonRequest
 */
message ButtonAck {
}

/**
 * Response: Device is asking computer to show PIN matrix and awaits PIN encoded using this matrix scheme
 * @next PinMatrixAck
 * @next Cancel
 */
message PinMatrixRequest {
	optional PinMatrixRequestType type = 1;
}

/**
 * Request: Computer responds with encoded PIN
 * @prev PinMatrixRequest
 */
message PinMatrixAck {
	required string pin = 1;		// matrix encoded PIN entered by user
}

/**
 * Request: Abort last operation that required user interaction
 * @prev ButtonRequest
 * @prev PinMatrixRequest
 * @prev PassphraseRequest
 */
message Cancel {
}

/**
 * Response: Device awaits encryption passphrase
 * @next PassphraseAck
 * @next Cancel
 */
message PassphraseRequest {
}

/**
 * Request: Send passphrase back
 * @prev PassphraseRequest
 */
message PassphraseAck {
	required string passphrase = 1;
}

/**
 * Request: Request a sample of random data generated by hardware RNG. May be used for testing.
 * @next ButtonRequest
 * @next Entropy
 * @next Failure
 */
message GetEntropy {
	required uint32 size = 1;		// size of requested entropy
}

/**
 * Response: Reply with random data generated by internal RNG
 * @prev GetEntropy
 */
message Entropy {
	required bytes entropy = 1;		// stream of random generated bytes
}

/**
 * Request: Ask device for public key corresponding to address_n path
 * @next PassphraseRequest
 * @next PublicKey
 * @next Failure
 */
message GetPublicKey {
	repeated uint32 address_n = 1;		// BIP-32 path to derive the key from master node
}

/**
 * Response: Contains public key derived from device private seed
 * @prev GetPublicKey
 */
message PublicKey {
	required HDNodeType node = 1;		// BIP32 public node
}

/**
 * Request: Ask device for address corresponding to address_n path
 * @next PassphraseRequest
 * @next Address
 * @next Failure
 */
message GetAddress {
	repeated uint32 address_n = 1;		// BIP-32 path to derive the key from master node
	optional string coin_name = 2 [default='Bitcoin'];
}

/**
 * Response: Contains address derived from device private seed
 * @prev GetAddress
 */
message Address {
	required string address = 1;		// Coin address in Base58 encoding
}

/**
 * Request: Request device to wipe all sensitive data and settings
 * @next ButtonRequest
 */
message WipeDevice {
}

/**
 * Request: Load seed and related internal settings from the computer
 * @next ButtonRequest
 * @next Success
 * @next Failure
 */
message LoadDevice {
	optional string mnemonic = 1;				// seed encoded as BIP-39 mnemonic (12, 18 or 24 words)
	optional HDNodeType node = 2;				// BIP-32 node
	optional string pin = 3;				// set PIN protection
	optional bool passphrase_protection = 4;		// enable master node encryption using passphrase
	optional string language = 5 [default='english'];	// device language
	optional string label = 6;				// device label
	optional bool skip_checksum = 7;			// do not test mnemonic for valid BIP-39 checksum
}

/**
 * Request: Ask device to do initialization involving user interaction
 * @next EntropyRequest
 * @next Failure
 */
message ResetDevice {
	optional bool display_random = 1;			// display entropy generated by the device before asking for additional entropy
	optional uint32 strength = 2 [default=128];		// strength of seed in bits
	optional bool passphrase_protection = 3;		// enable master node encryption using passphrase
	optional bool pin_protection = 4;			// enable PIN protection
	optional string language = 5 [default='english'];	// device language
	optional string label = 6;				// device label
}

/**
 * Response: Ask for additional entropy from host computer
 * @prev ResetDevice
 * @next EntropyAck
 */
message EntropyRequest {
}

/**
 * Request: Provide additional entropy for seed generation function
 * @prev EntropyRequest
 * @next ButtonRequest
 */
message EntropyAck {
	optional bytes entropy = 1;				// 256 bits (32 bytes) of random data
}

/**
 * Request: Start recovery workflow asking user for specific words of mnemonic
 * Used to recovery device safely even on untrusted computer.
 * @next WordRequest
 */
message RecoveryDevice {
	optional uint32 word_count = 1;				// number of words in BIP-39 mnemonic
	optional bool passphrase_protection = 2;		// enable master node encryption using passphrase
	optional bool pin_protection = 3;			// enable PIN protection
	optional string language = 4 [default='english'];	// device language
	optional string label = 5;				// device label
	optional bool enforce_wordlist = 6;			// enforce BIP-39 wordlist during the process
}

/**
 * Response: Device is waiting for user to enter word of the mnemonic
 * Its position is shown only on device's internal display.
 * @prev RecoveryDevice
 * @prev WordAck
 */
message WordRequest {
}

/**
 * Request: Computer replies with word from the mnemonic
 * @prev WordRequest
 * @next WordRequest
 * @next Success
 * @next Failure
 */
message WordAck {
	required string word = 1;				// one word of mnemonic on asked position
}

//////////////////////////////
// Message signing messages //
//////////////////////////////

/**
 * Request: Ask device to sign message
 * @next MessageSignature
 * @next Failure
 */
message SignMessage {
	repeated uint32 address_n = 1;				// BIP-32 path to derive the key from master node
	required bytes message = 2;				// message to be signed
	optional string coin_name = 3 [default='Bitcoin'];	// coin to use for signing
}

/**
 * Request: Ask device to verify message
 * @next Success
 * @next Failure
 */
message VerifyMessage {
	optional string address = 1;				// address to verify
	optional bytes signature = 2;				// signature to verify
	optional bytes message = 3;				// message to verify
}

/**
 * Response: Signed message
 * @prev SignMessage
 */
message MessageSignature {
	optional string address = 1;				// address used to sign the message
	optional bytes signature = 2;				// signature of the message
}

//////////////////////////////////
// Transaction signing messages //
//////////////////////////////////

/**
 * Request:  Estimated size of the transaction
 * This behaves exactly like SignTx, which means that it can ask using TxRequest
 * This call is non-blocking (except possible PassphraseRequest to unlock the seed)
 * @next TxSize
 * @next Failure
 */
message EstimateTxSize {
	required uint32 outputs_count = 1;			// number of transaction outputs
	required uint32 inputs_count = 2;			// number of transaction inputs
	optional string coin_name = 3 [default='Bitcoin'];	// coin to use
}

/**
 * Response: Estimated size of the transaction
 * @prev EstimateTxSize
 */
message TxSize {
	optional uint32 tx_size = 1;				// estimated size of transaction in bytes
}

/**
 * Request: Ask device to sign transaction
 * @next PassphraseRequest
 * @next PinMatrixRequest
 * @next TxRequest
 * @next Failure
 */
message SignTx {
	required uint32 outputs_count = 1;			// number of transaction outputs
	required uint32 inputs_count = 2;			// number of transaction inputs
	optional string coin_name = 3 [default='Bitcoin'];	// coin to use
}

/**
 * Request: Simplified transaction signing
 * This method doesn't support streaming, so there are hardware limits in number of inputs and outputs.
 * In case of success, the result is returned using TxRequest message.
 * @next PassphraseRequest
 * @next PinMatrixRequest
 * @next TxRequest
 * @next Failure
 */
message SimpleSignTx {
	repeated TxInputType inputs = 1;			// transaction inputs
	repeated TxOutputType outputs = 2;			// transaction outputs
	repeated TransactionType transactions = 3;		// transactions whose outputs are used to build current inputs
	optional string coin_name = 4 [default='Bitcoin'];	// coin to use
}

/**
 * Response: Device asks for information for signing transaction or returns the last result
 * If request_index is set, device awaits TxAck message (with fields filled in according to request_type)
 * If signature_index is set, 'signature' contains signed input of signature_index's input
 * @prev SignTx
 * @prev SimpleSignTx
 * @prev TxAck
 */
message TxRequest {
	optional RequestType request_type = 1;		// what should be filled in TxAck message?
	optional TxRequestDetails details = 2;		// request for tx details
	optional TxRequestSerialized serialized = 3;	// serialized data and request for next
}

message TxRequestDetails {
	optional uint32 request_index = 1;		// device expects TxAck message from the computer
	optional bytes tx_hash = 2;			// tx_hash of requested transaction
}

message TxRequestSerialized {
	optional uint32 signature_index = 1;		// 'signature' field contains signed input of this index
	optional bytes signature = 2;			// signature of the signature_index input
	optional bytes serialized_tx = 3;		// part of serialized and signed transaction
}

/**
 * Request: Reported transaction data
 * @prev TxRequest
 * @next TxRequest
 */
message TxAck {
	optional TransactionType tx = 1;
}

/////////////////////////
// Bootloader messages //
/////////////////////////

/**
 * Request: Ask device to erase its firmware
 * @next Success
 * @next Failure
 */
message FirmwareErase {
}

/**
 * Request: Send firmware in binary form to the device
 * @next Success
 * @next Failure
 */
message FirmwareUpload {
	required bytes payload = 1;			// firmware to be loaded into device
}

/////////////////////////////////////////////////////////////
// Debug messages (only available if DebugLink is enabled) //
/////////////////////////////////////////////////////////////

/**
 * Request: "Press" the button on the device
 * @next Success
 */
message DebugLinkDecision {
	required bool yes_no = 1;			// true for "Confirm", false for "Cancel"
}

/**
 * Request: Computer asks for device state
 * @next DebugLinkState
 */
message DebugLinkGetState {
}

/**
 * Response: Device current state
 * @prev DebugLinkGetState
 */
message DebugLinkState {
	optional bytes layout = 1;			// raw buffer of display
	optional string pin = 2;			// current PIN, blank if PIN is not set/enabled
	optional string matrix = 3;			// current PIN matrix
	optional string mnemonic = 4;			// current BIP-39 mnemonic
	optional HDNodeType node = 5;			// current BIP-32 node
	optional bool passphrase_protection = 6;	// is node/mnemonic encrypted using passphrase?
	optional string reset_word = 7;			// word on device display during ResetDevice workflow
	optional bytes reset_entropy = 8;		// current entropy during ResetDevice workflow
	optional string recovery_fake_word = 9;		// (fake) word on display during RecoveryDevice workflow
	optional uint32 recovery_word_pos = 10;		// index of mnemonic word the device is expecting during RecoveryDevice workflow
}

/**
 * Request: Ask device to restart
 */
message DebugLinkStop {
}

/**
 * Response: Device wants host to log event
 */
message DebugLinkLog {
	optional uint32 level = 1;
	optional string bucket = 2;
	optional string text = 3;
}