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 [default=""]; // 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_InvalidSession = 14;
        Failure_FirmwareError = 99;
    }
}

/**
 * Response: Device is waiting for HW button press.
 * @auxstart
 * @next ButtonAck
 */
message ButtonRequest {
    optional ButtonRequestType code = 1;  // enum identifier of the screen
    optional uint32 pages = 2;            // if the screen is paginated, number of pages
    optional uint32 page_number = 3;      // if the screen is paginated, current page (1-based)
    /* Rationale: both fields are optional, and neither field can have 0 as a valid
    value. So both testing `if pages` and `if page_number` do the right thing.
    Also the following is always true: `page_is_last = (page_number == pages)` */

    /**
    * 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;
        _Deprecated_ButtonRequest_PassphraseType = 14 [deprecated=true];
        ButtonRequest_UnknownDerivationPath = 15;
        ButtonRequest_RecoveryHomepage = 16;
        ButtonRequest_Success = 17;
        ButtonRequest_Warning = 18;
        ButtonRequest_PassphraseEntry = 19;
        ButtonRequest_PinEntry = 20;
    }
}

/**
 * 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 [deprecated=true];  // <2.3.0
}

/**
 * Request: Send passphrase back
 * @auxend
 */
message PassphraseAck {
    optional string passphrase = 1;
    optional bytes _state = 2 [deprecated=true];  // <2.3.0
    optional bool on_device = 3;    // user wants to enter passphrase on the device
}

/**
 * Response: Device awaits passphrase state
 * Deprecated in 2.3.0
 * @next Deprecated_PassphraseStateAck
 */
message Deprecated_PassphraseStateRequest {
    option deprecated = true;
    optional bytes state = 1;       // actual device state
}

/**
 * Request: Send passphrase state back
 * Deprecated in 2.3.0
 * @auxend
 */
message Deprecated_PassphraseStateAck {
    option deprecated = true;
}

/**
 * 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;
    required bytes public_key = 6;
}