syntax = "proto2";
package hw.trezor.messages.common;

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

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

/**
 * Response: Failure of the previous request
 * @end
 */
message Failure {
    optional FailureType code = 1;  // computer-readable definition of the error state
    optional string message = 2;    // human-readable message of the error state
    enum FailureType {
        Failure_UnexpectedMessage = 1;
        Failure_ButtonExpected = 2;
        Failure_DataError = 3;
        Failure_ActionCancelled = 4;
        Failure_PinExpected = 5;
        Failure_PinCancelled = 6;
        Failure_PinInvalid = 7;
        Failure_InvalidSignature = 8;
        Failure_ProcessError = 9;
        Failure_NotEnoughFunds = 10;
        Failure_NotInitialized = 11;
        Failure_PinMismatch = 12;
        Failure_WipeCodeMismatch = 13;
        Failure_FirmwareError = 99;
    }
}

/**
 * Response: Device is waiting for HW button press.
 * @auxstart
 * @next ButtonAck
 */
message ButtonRequest {
    optional ButtonRequestType code = 1;
    /**
    * Type of button request
    */
    enum ButtonRequestType {
        ButtonRequest_Other = 1;
        ButtonRequest_FeeOverThreshold = 2;
        ButtonRequest_ConfirmOutput = 3;
        ButtonRequest_ResetDevice = 4;
        ButtonRequest_ConfirmWord = 5;
        ButtonRequest_WipeDevice = 6;
        ButtonRequest_ProtectCall = 7;
        ButtonRequest_SignTx = 8;
        ButtonRequest_FirmwareCheck = 9;
        ButtonRequest_Address = 10;
        ButtonRequest_PublicKey = 11;
        ButtonRequest_MnemonicWordCount = 12;
        ButtonRequest_MnemonicInput = 13;
        ButtonRequest_PassphraseType = 14;
        ButtonRequest_UnknownDerivationPath = 15;
        ButtonRequest_RecoveryHomepage = 16;
        ButtonRequest_Success = 17;
        ButtonRequest_Warning = 18;
    }
}

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

/**
 * Response: Device is asking computer to show PIN matrix and awaits PIN encoded using this matrix scheme
 * @auxstart
 * @next PinMatrixAck
 */
message PinMatrixRequest {
    optional PinMatrixRequestType type = 1;
    /**
    * Type of PIN request
    */
    enum PinMatrixRequestType {
        PinMatrixRequestType_Current = 1;
        PinMatrixRequestType_NewFirst = 2;
        PinMatrixRequestType_NewSecond = 3;
        PinMatrixRequestType_WipeCodeFirst = 4;
        PinMatrixRequestType_WipeCodeSecond = 5;
    }
}

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

/**
 * Response: Device awaits encryption passphrase
 * @auxstart
 * @next PassphraseAck
 */
message PassphraseRequest {
    optional bool on_device = 1;    // passphrase is being entered on the device
}

/**
 * Request: Send passphrase back
 * @next PassphraseStateRequest
 */
message PassphraseAck {
    optional string passphrase = 1;
    optional bytes state = 2;       // expected device state
}

/**
 * Response: Device awaits passphrase state
 * @next PassphraseStateAck
 */
message PassphraseStateRequest {
    optional bytes state = 1;       // actual device state
}

/**
 * Request: Send passphrase state back
 * @auxend
 */
message PassphraseStateAck {
}

/**
 * Structure representing BIP32 (hierarchical deterministic) node
 * Used for imports of private key into the device and exporting public key out of device
 * @embed
 */
message HDNodeType {
    required uint32 depth = 1;
    required uint32 fingerprint = 2;
    required uint32 child_num = 3;
    required bytes chain_code = 4;
    optional bytes private_key = 5;
    optional bytes public_key = 6;
}