trezor-firmware/src/apps/monero/get_watch_only.py

from trezor.messages.MoneroGetWatchKey import MoneroGetWatchKey
from trezor.messages.MoneroWatchKey import MoneroWatchKey

from apps.monero import misc
from apps.monero.layout import confirms
from apps.monero.xmr import crypto


async def get_watch_only(ctx, msg: MoneroGetWatchKey):
    await confirms.require_confirm_watchkey(ctx)

    creds = await misc.get_creds(ctx, msg.address_n, msg.network_type)
    address = creds.address
    watch_key = crypto.encodeint(creds.view_key_private)

    return MoneroWatchKey(watch_key=watch_key, address=address)