trezor-firmware/common/protob/messages-ethereum-eip712.proto

syntax = "proto2";
package hw.trezor.messages.ethereum_eip712;

// Sugar for easier handling in Java
option java_package = "com.satoshilabs.trezor.lib.protobuf";
option java_outer_classname = "TrezorMessageEthereumEIP712";


// Separated from messages-ethereum.proto as it is not implemented on T1 side
// and defining all the messages and fields could be even impossible as recursive
// messages are used here


/**
 * Request: Ask device to sign typed data
 * @start
 * @next EthereumTypedDataStructRequest
 * @next EthereumTypedDataValueRequest
 * @next EthereumTypedDataSignature
 * @next Failure
 */
message EthereumSignTypedData {
    repeated uint32 address_n = 1;                       // BIP-32 path to derive the key from master node
    required string primary_type = 2;                    // name of the root message struct
    optional bool metamask_v4_compat = 3 [default=true]; // use MetaMask v4 (see https://github.com/MetaMask/eth-sig-util/issues/106)
}

/**
 * Response: Device asks for type information about a struct.
 * @next EthereumTypedDataStructAck
 */
message EthereumTypedDataStructRequest {
    required string name = 1; // name of the requested struct
}

/**
 * Request: Type information about a struct.
 * @next EthereumTypedDataStructRequest
 */
message EthereumTypedDataStructAck {
    repeated EthereumStructMember members = 1;

    message EthereumStructMember {
        required EthereumFieldType type = 1;
        required string name = 2;
    }

    message EthereumFieldType {
        required EthereumDataType data_type = 1;
        optional uint32 size = 2;                   // for integer types: size in bytes (uint8 has size 1, uint256 has size 32)
                                                    // for bytes types: size in bytes, or unset for dynamic
                                                    // for arrays: size in elements, or unset for dynamic
                                                    // for structs: number of members
                                                    // for string, bool and address: unset
        optional EthereumFieldType entry_type = 3;  // for array types, type of single entry
        optional string struct_name = 4;            // for structs: its name
    }

    enum EthereumDataType {
        UINT = 1;
        INT = 2;
        BYTES = 3;
        STRING = 4;
        BOOL = 5;
        ADDRESS = 6;
        ARRAY = 7;
        STRUCT = 8;
    }
}

/**
 * Response: Device asks for data at the specific member path.
 * @next EthereumTypedDataValueAck
 */
message EthereumTypedDataValueRequest {
    repeated uint32 member_path = 1; // member path requested by device
}

/**
 * Request: Single value of a specific atomic field.
 * @next EthereumTypedDataValueRequest
 */
message EthereumTypedDataValueAck {
    required bytes value = 1;
    // * atomic types: value of the member.
    //   Length must match the `size` of the corresponding field type, unless the size is dynamic.
    // * array types: number of elements, encoded as uint16.
    // * struct types: undefined, Trezor will not query a struct field.
}

/**
 * Response: Signed typed data
 * @end
 */
message EthereumTypedDataSignature {
    required bytes signature = 1;    // signature of the typed data
    required string address = 2;     // address used to sign the typed data
}