trezor-firmware/trezorctl

#!/usr/bin/env python3

# This file is part of the TREZOR project.
#
# Copyright (C) 2012-2017 Marek Palatinus <slush@satoshilabs.com>
# Copyright (C) 2012-2017 Pavol Rusnak <stick@satoshilabs.com>
# Copyright (C) 2016-2017 Jochen Hoenicke <hoenicke@gmail.com>
# Copyright (C) 2017      mruddy
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

import base64
import binascii
import click
import functools
import json
import os
import sys

from trezorlib.client import TrezorClient, TrezorClientVerbose, CallException
from trezorlib.device import TrezorDevice
from trezorlib import messages as proto
from trezorlib import protobuf
from trezorlib.coins import coins_txapi
from trezorlib.ckd_public import PRIME_DERIVATION_FLAG


class ChoiceType(click.Choice):
    def __init__(self, typemap):
        super(ChoiceType, self).__init__(typemap.keys())
        self.typemap = typemap

    def convert(self, value, param, ctx):
        value = super(ChoiceType, self).convert(value, param, ctx)
        return self.typemap[value]


CHOICE_RECOVERY_DEVICE_TYPE = ChoiceType({
    'scrambled':  proto.RecoveryDeviceType.ScrambledWords,
    'matrix':     proto.RecoveryDeviceType.Matrix,
})

CHOICE_INPUT_SCRIPT_TYPE = ChoiceType({
    'address':    proto.InputScriptType.SPENDADDRESS,
    'segwit':     proto.InputScriptType.SPENDWITNESS,
    'p2shsegwit': proto.InputScriptType.SPENDP2SHWITNESS,
})

CHOICE_OUTPUT_SCRIPT_TYPE = ChoiceType({
    'address':    proto.OutputScriptType.PAYTOADDRESS,
    'segwit':     proto.OutputScriptType.PAYTOWITNESS,
    'p2shsegwit': proto.OutputScriptType.PAYTOP2SHWITNESS,
})


@click.group(context_settings={'max_content_width': 400})
@click.option('-p', '--path', help='Select device by specific path.', default=os.environ.get('TREZOR_PATH'))
@click.option('-v', '--verbose', is_flag=True, help='Show communication messages.')
@click.option('-j', '--json', 'is_json', is_flag=True, help='Print result as JSON object')
@click.pass_context
def cli(ctx, path, verbose, is_json):
    if ctx.invoked_subcommand != 'list':
        if verbose:
            ctx.obj = lambda: TrezorClientVerbose(TrezorDevice.find_by_path(path))
        else:
            ctx.obj = lambda: TrezorClient(TrezorDevice.find_by_path(path))


@cli.resultcallback()
def print_result(res, path, verbose, is_json):
    if is_json:
        if issubclass(res.__class__, protobuf.MessageType):
            click.echo(json.dumps({res.__class__.__name__: res.__dict__}))
        else:
            click.echo(json.dumps(res, sort_keys=True, indent=4))
    else:
        if isinstance(res, list):
            for line in res:
                click.echo(line)
        elif isinstance(res, dict):
            for k, v in res.items():
                if isinstance(v, dict):
                    for kk, vv in v.items():
                        click.echo('%s.%s: %s' % (k, kk, vv))
                else:
                    click.echo('%s: %s' % (k, v))
        else:
            click.echo(res)


#
# Common functions
#


@cli.command(name='list', help='List connected TREZOR devices.')
def ls():
    return TrezorDevice.enumerate()


@cli.command(help='Show version of trezorctl/trezorlib.')
def version():
    from trezorlib import __version__ as VERSION
    return VERSION


#
# Basic device functions
#


@cli.command(help='Send ping message.')
@click.argument('message')
@click.option('-b', '--button-protection', is_flag=True)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.pass_obj
def ping(connect, message, button_protection, pin_protection, passphrase_protection):
    return connect().ping(message, button_protection=button_protection, pin_protection=pin_protection, passphrase_protection=passphrase_protection)


@cli.command(help='Clear session (remove cached PIN, passphrase, etc.).')
@click.pass_obj
def clear_session(connect):
    return connect().clear_session()


@cli.command(help='Get example entropy.')
@click.argument('size', type=int)
@click.pass_obj
def get_entropy(connect, size):
    return binascii.hexlify(connect().get_entropy(size))


@cli.command(help='Retrieve device features and settings.')
@click.pass_obj
def get_features(connect):
    return connect().features


@cli.command(help='List all supported coin types by the device.')
@click.pass_obj
def list_coins(connect):
    return [coin.coin_name for coin in connect().features.coins]


#
# Device management functions
#


@cli.command(help='Change new PIN or remove existing.')
@click.option('-r', '--remove', is_flag=True)
@click.pass_obj
def change_pin(connect, remove):
    return connect().change_pin(remove)


@cli.command(help='Enable passphrase.')
@click.pass_obj
def enable_passphrase(connect):
    return connect().apply_settings(use_passphrase=True)


@cli.command(help='Disable passphrase.')
@click.pass_obj
def disable_passphrase(connect):
    return connect().apply_settings(use_passphrase=False)


@cli.command(help='Set new device label.')
@click.option('-l', '--label')
@click.pass_obj
def set_label(connect, label):
    return connect().apply_settings(label=label)


@cli.command(help='Set device flags.')
@click.argument('flags')
@click.pass_obj
def set_flags(connect, flags):
    flags = flags.lower()
    if flags.startswith('0b'):
        flags = int(flags, 2)
    elif flags.startswith('0x'):
        flags = int(flags, 16)
    else:
        flags = int(flags)
    return connect().apply_flags(flags=flags)


@cli.command(help='Set new homescreen.')
@click.option('-f', '--filename', default=None)
@click.pass_obj
def set_homescreen(connect, filename):
    if filename is None:
        img = b'\x00'
    elif filename.endswith('.toif'):
        img = open(filename, 'rb').read()
        if img[:8] != b'TOIf\x90\x00\x90\x00':
            raise CallException(types.Failure_DataError, 'File is not a TOIF file with size of 144x144')
    else:
        from PIL import Image
        im = Image.open(filename)
        if im.size != (128, 64):
            raise CallException(proto.FailureType.DataError, 'Wrong size of the image')
        im = im.convert('1')
        pix = im.load()
        img = bytearray(1024)
        for j in range(64):
            for i in range(128):
                if pix[i, j]:
                    o = (i + j * 128)
                    img[o // 8] |= (1 << (7 - o % 8))
        img = bytes(img)
    return connect().apply_settings(homescreen=img)


@cli.command(help='Set U2F counter.')
@click.argument('counter', type=int)
@click.pass_obj
def set_u2f_counter(connect, counter):
    return connect().set_u2f_counter(counter)


@cli.command(help='Reset device to factory defaults and remove all private data.')
@click.pass_obj
def wipe_device(connect):
    return connect().wipe_device()


@cli.command(help='Load custom configuration to the device.')
@click.option('-m', '--mnemonic')
@click.option('-e', '--expand', is_flag=True)
@click.option('-x', '--xprv')
@click.option('-p', '--pin', default='')
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-l', '--label', default='')
@click.option('-i', '--ignore-checksum', is_flag=True)
@click.option('-s', '--slip0014', is_flag=True)
@click.pass_obj
def load_device(connect, mnemonic, expand, xprv, pin, passphrase_protection, label, ignore_checksum, slip0014):
    if not mnemonic and not xprv and not slip0014:
        raise CallException(proto.FailureType.DataError, 'Please provide mnemonic or xprv')

    client = connect()
    if mnemonic:
        return client.load_device_by_mnemonic(
            mnemonic,
            pin,
            passphrase_protection,
            label,
            'english',
            ignore_checksum,
            expand
        )
    if xprv:
        return client.load_device_by_xprv(
            xprv,
            pin,
            passphrase_protection,
            label,
            'english'
        )
    if slip0014:
        return client.load_device_by_mnemonic(
            ' '.join(['all'] * 12),
            pin,
            passphrase_protection,
            'SLIP-0014'
        )


@cli.command(help='Start safe recovery workflow.')
@click.option('-w', '--words', type=click.Choice(['12', '18', '24']), default='24')
@click.option('-e', '--expand', is_flag=True)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-l', '--label')
@click.option('-t', '--type', 'rec_type', type=CHOICE_RECOVERY_DEVICE_TYPE, default='scrambled')
@click.option('-d', '--dry-run', is_flag=True)
@click.pass_obj
def recovery_device(connect, words, expand, pin_protection, passphrase_protection, label, rec_type, dry_run):
    return connect().recovery_device(
        int(words),
        passphrase_protection,
        pin_protection,
        label,
        'english',
        rec_type,
        expand,
        dry_run
    )


@cli.command(help='Perform device setup and generate new seed.')
@click.option('-e', '--entropy', is_flag=True)
@click.option('-t', '--strength', type=click.Choice(['128', '192', '256']), default='256')
@click.option('-r', '--passphrase-protection', is_flag=True)
@click.option('-p', '--pin-protection', is_flag=True)
@click.option('-l', '--label')
@click.option('-u', '--u2f-counter', default=0)
@click.option('-s', '--skip-backup', is_flag=True)
@click.pass_obj
def reset_device(connect, entropy, strength, passphrase_protection, pin_protection, label, u2f_counter, skip_backup):
    return connect().reset_device(
        entropy,
        int(strength),
        passphrase_protection,
        pin_protection,
        label,
        'english',
        u2f_counter,
        skip_backup
    )


@cli.command(help='Perform device seed backup.')
@click.pass_obj
def backup_device(connect):
    return connect().backup_device()


#
# Firmware update
#


@cli.command(help='Upload new firmware to device (must be in bootloader mode).')
@click.option('-f', '--filename')
@click.option('-u', '--url')
@click.option('-v', '--version')
@click.option('-s', '--skip-check', is_flag=True)
@click.option('-e', '--erase', is_flag=True)
@click.pass_obj
def firmware_update(connect, filename, url, version, skip_check, erase):
    if filename:
        fp = open(filename, 'rb').read()
    elif url:
        import requests
        click.echo('Downloading from', url)
        r = requests.get(url)
        fp = r.content
    elif erase:
        fp = 32768 * b'\xFF'
    else:
        import requests
        r = requests.get('https://wallet.trezor.io/data/firmware/releases.json')
        releases = r.json()

        def version_func(r):
            return r['version']

        def version_string(r):
            return '.'.join(map(str, version_func(r)))

        if version:
            release = next((r for r in releases if version_string(r) == version))
        else:
            release = max(releases, key=version_func)
            click.echo('Fetching version: %s' % version_string(release))
        click.echo('Firmware fingerprint: %s' % release['fingerprint'])
        url = 'https://wallet.trezor.io/' + release['url']
        click.echo('Downloading from %s' % url)
        r = requests.get(url)
        fp = r.content

    if not skip_check and not erase:
        if fp[:8] == b'54525a52' or fp[:8] == b'54525a56':
            fp = binascii.unhexlify(fp)
        if fp[:4] != b'TRZR' and fp[:4] != b'TRZV':
            raise CallException(proto.FailureType.FirmwareError, 'TREZOR firmware header expected')

    click.echo('Please confirm action on device...')

    from io import BytesIO
    return connect().firmware_update(fp=BytesIO(fp))


@cli.command(help='Perform a self-test.')
@click.pass_obj
def self_test(connect):
    return connect().self_test()


#
# Basic coin functions
#


@cli.command(help='Get address for specified path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.option('-t', '--script-type', type=CHOICE_INPUT_SCRIPT_TYPE, default='address')
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def get_address(connect, coin, address, script_type, show_display):
    client = connect()
    address_n = client.expand_path(address)
    return client.get_address(coin, address_n, show_display, script_type=script_type)


@cli.command(help='Get public node of given path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'")
@click.option('-e', '--curve')
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def get_public_node(connect, coin, address, curve, show_display):
    client = connect()
    address_n = client.expand_path(address)
    result = client.get_public_node(address_n, ecdsa_curve_name=curve, show_display=show_display, coin_name=coin)
    return {
        'node': {
            'depth': result.node.depth,
            'fingerprint': "%08x" % result.node.fingerprint,
            'child_num': result.node.child_num,
            'chain_code': binascii.hexlify(result.node.chain_code),
            'public_key': binascii.hexlify(result.node.public_key),
        },
        'xpub': result.xpub
    }


#
# Signing options
#

@cli.command(help='Sign transaction.')
@click.option('-c', '--coin', default='Bitcoin')
# @click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
# @click.option('-t', '--script-type', type=CHOICE_INPUT_SCRIPT_TYPE, default='address')
# @click.option('-o', '--output', required=True, help='Transaction output')
# @click.option('-f', '--fee', required=True, help='Transaction fee (sat/B)')
@click.pass_obj
def sign_tx(connect, coin):
    client = connect()
    if coin in coins_txapi:
        txapi = coins_txapi[coin]
    else:
        click.echo('Coin "%s" is not recognized.' % coin, err=True)
        click.echo('Supported coin types: %s' % ', '.join(coins_txapi.keys()), err=True)
        sys.exit(1)

    client.set_tx_api(txapi)

    def default_script_type(address_n):
        script_type = 'address'

        if address_n is None:
            pass
        elif address_n[0] == (49 | PRIME_DERIVATION_FLAG):
            script_type = 'p2shsegwit'

        return script_type

    def outpoint(s):
        txid, vout = s.split(':')
        return binascii.unhexlify(txid), int(vout)

    inputs = []
    while True:
        click.echo()
        prev = click.prompt('Previous output to spend (txid:vout)', type=outpoint, default='')
        if not prev:
            break
        prev_hash, prev_index = prev
        address_n = click.prompt('BIP-32 path to derive the key', type=client.expand_path)
        amount = click.prompt('Input amount (satoshis)', type=int, default=0)
        sequence = click.prompt('Sequence Number to use (RBF opt-in enabled by default)', type=int, default=0xfffffffd)
        script_type = click.prompt('Input type', type=CHOICE_INPUT_SCRIPT_TYPE, default=default_script_type(address_n))
        script_type = script_type if isinstance(script_type, int) else CHOICE_INPUT_SCRIPT_TYPE.typemap[script_type]
        inputs.append(proto.TxInputType(
            address_n=address_n,
            prev_hash=prev_hash,
            prev_index=prev_index,
            amount=amount,
            script_type=script_type,
            sequence=sequence,
        ))

    outputs = []
    while True:
        click.echo()
        address = click.prompt('Output address (for non-change output)', default='')
        if address:
            address_n = None
        else:
            address_n = click.prompt('BIP-32 path (for change output)', type=client.expand_path, default='')
            if not address_n:
                break
        amount = click.prompt('Amount to spend (satoshis)', type=int)
        script_type = click.prompt('Output type', type=CHOICE_OUTPUT_SCRIPT_TYPE, default=default_script_type(address_n))
        script_type = script_type if isinstance(script_type, int) else CHOICE_OUTPUT_SCRIPT_TYPE.typemap[script_type]
        outputs.append(proto.TxOutputType(
            address_n=address_n,
            address=address,
            amount=amount,
            script_type=script_type,
        ))

    tx_version = click.prompt('Transaction version', type=int, default=2)
    tx_locktime = click.prompt('Transaction locktime', type=int, default=0)

    (signatures, serialized_tx) = client.sign_tx(coin, inputs, outputs, tx_version, tx_locktime)

    client.close()

    click.echo()
    click.echo('Signed Transaction:')
    click.echo(binascii.hexlify(serialized_tx))
    click.echo()
    click.echo('Use the following form to broadcast it to the network:')
    click.echo(txapi.pushtx_url)


#
# Message functions
#


@cli.command(help='Sign message using address of given path.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.option('-t', '--script-type', type=click.Choice(['address', 'segwit', 'p2shsegwit']), default='address')
@click.argument('message')
@click.pass_obj
def sign_message(connect, coin, address, message, script_type):
    client = connect()
    address_n = client.expand_path(address)
    typemap = {
        'address': proto.InputScriptType.SPENDADDRESS,
        'segwit': proto.InputScriptType.SPENDWITNESS,
        'p2shsegwit': proto.InputScriptType.SPENDP2SHWITNESS,
    }
    script_type = typemap[script_type]
    res = client.sign_message(coin, address_n, message, script_type)
    return {
        'message': message,
        'address': res.address,
        'signature': base64.b64encode(res.signature)
    }


@cli.command(help='Verify message.')
@click.option('-c', '--coin', default='Bitcoin')
@click.argument('address')
@click.argument('signature')
@click.argument('message')
@click.pass_obj
def verify_message(connect, coin, address, signature, message):
    signature = base64.b64decode(signature)
    return connect().verify_message(coin, address, signature, message)


@cli.command(help='Sign message with Ethereum address.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/60'/0'/0/0")
@click.argument('message')
@click.pass_obj
def ethereum_sign_message(connect, address, message):
    client = connect()
    address_n = client.expand_path(address)
    ret = client.ethereum_sign_message(address_n, message)
    output = {
        'message': message,
        'address': '0x%s' % binascii.hexlify(ret.address).decode(),
        'signature': '0x%s' % binascii.hexlify(ret.signature).decode()
    }
    return output


def ethereum_decode_hex(value):
    if value.startswith('0x') or value.startswith('0X'):
        return value[2:].decode('hex')
    else:
        return value.decode('hex')


@cli.command(help='Verify message signed with Ethereum address.')
@click.argument('address')
@click.argument('signature')
@click.argument('message')
@click.pass_obj
def ethereum_verify_message(connect, address, signature, message):
    address = ethereum_decode_hex(address)
    signature = ethereum_decode_hex(signature)
    return connect().ethereum_verify_message(address, signature, message)


@cli.command(help='Encrypt value by given key and path.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/10016'/0")
@click.argument('key')
@click.argument('value')
@click.pass_obj
def encrypt_keyvalue(connect, address, key, value):
    client = connect()
    address_n = client.expand_path(address)
    res = client.encrypt_keyvalue(address_n, key, value.encode())
    return binascii.hexlify(res)


@cli.command(help='Decrypt value by given key and path.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/10016'/0")
@click.argument('key')
@click.argument('value')
@click.pass_obj
def decrypt_keyvalue(connect, address, key, value):
    client = connect()
    address_n = client.expand_path(address)
    return client.decrypt_keyvalue(address_n, key, binascii.unhexlify(value))


@cli.command(help='Encrypt message.')
@click.option('-c', '--coin', default='Bitcoin')
@click.option('-d', '--display-only', is_flag=True)
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.argument('pubkey')
@click.argument('message')
@click.pass_obj
def encrypt_message(connect, coin, display_only, address, pubkey, message):
    client = connect()
    pubkey = binascii.unhexlify(pubkey)
    address_n = client.expand_path(address)
    res = client.encrypt_message(pubkey, message, display_only, coin, address_n)
    return {
        'nonce': binascii.hexlify(res.nonce),
        'message': binascii.hexlify(res.message),
        'hmac': binascii.hexlify(res.hmac),
        'payload': base64.b64encode(res.nonce + res.message + res.hmac),
    }


@cli.command(help='Decrypt message.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.argument('payload')
@click.pass_obj
def decrypt_message(connect, address, payload):
    client = connect()
    address_n = client.expand_path(address)
    payload = base64.b64decode(payload)
    nonce, message, msg_hmac = payload[:33], payload[33:-8], payload[-8:]
    return client.decrypt_message(address_n, nonce, message, msg_hmac)


#
# Ethereum functions
#


@cli.command(help='Get Ethereum address in hex encoding.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/60'/0'/0/0")
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def ethereum_get_address(connect, address, show_display):
    client = connect()
    address_n = client.expand_path(address)
    address = client.ethereum_get_address(address_n, show_display)
    return '0x%s' % binascii.hexlify(address).decode()


@cli.command(help='Sign (and optionally publish) Ethereum transaction. Use TO as destination address or set TO to "" for contract creation.')
@click.option('-a', '--host', default='localhost:8545', help='RPC port of ethereum node for automatic gas/nonce estimation and publishing')
@click.option('-c', '--chain-id', type=int, help='EIP-155 chain id (replay protection)')
@click.option('-n', '--address', required=True, help="BIP-32 path to source address, e.g., m/44'/60'/0'/0/0")
@click.option('-v', '--value', default='0', help='Ether amount to transfer, e.g. "100 milliether"')
@click.option('-g', '--gas-limit', type=int, help='Gas limit - Required for offline signing')
@click.option('-t', '--gas-price', help='Gas price, e.g. "20 nanoether" - Required for offline signing')
@click.option('-i', '--nonce', type=int, help='Transaction counter - Required for offline signing')
@click.option('-d', '--data', default='', help='Data as hex string, e.g. 0x12345678')
@click.option('-p', '--publish', is_flag=True, help='Publish transaction via RPC')
@click.argument('to')
@click.pass_obj
def ethereum_sign_tx(connect, host, chain_id, address, value, gas_limit, gas_price, nonce, data, publish, to):
    from ethjsonrpc import EthJsonRpc
    import rlp

    ether_units = {
        'wei':          1,
        'kwei':         1000,
        'babbage':      1000,
        'femtoether':   1000,
        'mwei':         1000000,
        'lovelace':     1000000,
        'picoether':    1000000,
        'gwei':         1000000000,
        'shannon':      1000000000,
        'nanoether':    1000000000,
        'nano':         1000000000,
        'szabo':        1000000000000,
        'microether':   1000000000000,
        'micro':        1000000000000,
        'finney':       1000000000000000,
        'milliether':   1000000000000000,
        'milli':        1000000000000000,
        'ether':        1000000000000000000,
        'eth':          1000000000000000000,
    }

    if ' ' in value:
        value, unit = value.split(' ', 1)
        if unit.lower() not in ether_units:
            raise CallException(proto.Failure_DataError, 'Unrecognized ether unit %r' % unit)
        value = int(value) * ether_units[unit.lower()]
    else:
        value = int(value)

    if gas_price is not None:
        if ' ' in gas_price:
            gas_price, unit = gas_price.split(' ', 1)
            if unit.lower() not in ether_units:
                raise CallException(proto.Failure_DataError, 'Unrecognized gas price unit %r' % unit)
            gas_price = int(gas_price) * ether_units[unit.lower()]
        else:
            gas_price = int(gas_price)

    if gas_limit is not None:
        gas_limit = int(gas_limit)

    to_address = ethereum_decode_hex(to)

    client = connect()
    address_n = client.expand_path(address)
    address = '0x%s' % (binascii.hexlify(client.ethereum_get_address(address_n)),)

    if gas_price is None or gas_limit is None or nonce is None:
        host, port = host.split(':')
        eth = EthJsonRpc(host, int(port))

    if not data:
        data = ''
    data = ethereum_decode_hex(data)

    if gas_price is None:
        gas_price = eth.eth_gasPrice()

    if gas_limit is None:
        gas_limit = eth.eth_estimateGas(
            to_address=to,
            from_address=address,
            value=('0x%x' % value),
            data='0x' + data)

    if nonce is None:
        nonce = eth.eth_getTransactionCount(address)

    sig = client.ethereum_sign_tx(
        n=address_n,
        nonce=nonce,
        gas_price=gas_price,
        gas_limit=gas_limit,
        to=to_address,
        value=value,
        data=data,
        chain_id=chain_id)

    transaction = rlp.encode(
        (nonce, gas_price, gas_limit, to_address, value, data) + sig)
    tx_hex = '0x%s' % binascii.hexlify(transaction)

    if publish:
        tx_hash = eth.eth_sendRawTransaction(tx_hex)
        return 'Transaction published with ID: %s' % tx_hash
    else:
        return 'Signed raw transaction: %s' % tx_hex


#
# NEM functions
#


@cli.command(help='Get NEM address for specified path.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/43'/0/0")
@click.option('-N', '--network', type=int, default=0x68)
@click.option('-d', '--show-display', is_flag=True)
@click.pass_obj
def nem_get_address(connect, address, network, show_display):
    client = connect()
    address_n = client.expand_path(address)
    return client.nem_get_address(address_n, network, show_display)


@cli.command(help='Sign (and optionally broadcast) NEM transaction.')
@click.option('-n', '--address', help='BIP-32 path to signing key')
@click.option('-f', '--file', type=click.File('r'), default='-', help='Transaction in NIS (RequestPrepareAnnounce) format')
@click.option('-b', '--broadcast', help='NIS to announce transaction to')
@click.pass_obj
def nem_sign_tx(connect, address, file, broadcast):
    client = connect()
    address_n = client.expand_path(address)
    transaction = client.nem_sign_tx(address_n, json.load(file))

    payload = {
        "data": binascii.hexlify(transaction.data).decode(),
        "signature": binascii.hexlify(transaction.signature).decode()
    }

    if broadcast:
        import requests
        return requests.post("{}/transaction/announce".format(broadcast), json=payload).json()
    else:
        return payload


#
# CoSi functions
#


@cli.command(help='Ask device to commit to CoSi signing.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.argument('data')
@click.pass_obj
def cosi_commit(connect, address, data):
    client = connect()
    address_n = client.expand_path(address)
    return client.cosi_commit(address_n, binascii.unhexlify(data))


@cli.command(help='Ask device to sign using CoSi.')
@click.option('-n', '--address', required=True, help="BIP-32 path, e.g. m/44'/0'/0'/0/0")
@click.argument('data')
@click.argument('global_commitment')
@click.argument('global_pubkey')
@click.pass_obj
def cosi_sign(connect, address, data, global_commitment, global_pubkey):
    client = connect()
    address_n = client.expand_path(address)
    return client.cosi_sign(address_n, binascii.unhexlify(data), binascii.unhexlify(global_commitment), binascii.unhexlify(global_pubkey))


#
# Main
#


if __name__ == '__main__':
    cli()