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#!/usr/bin/env python3
# This file is part of the SBK project
# https://github.com/mbarkhau/sbk
#
# Copyright (c) 2019-2021 Manuel Barkhau (mbarkhau@gmail.com) - MIT License
# SPDX-License-Identifier: MIT
"""GUI Tasks (on threads) for SBK."""
import time
import typing as typ
import logging
import PyQt5.QtCore as qtc
from . import kdf
from . import params
from . import ui_common
from . import common_types as ct
from . import gui_panels_base as gpb
logger = logging.getLogger("sbk.gui_tasks")
class ProgressStatus(typ.NamedTuple):
current: int
length : int
def init_progres_status_emitter_clazz(signal) -> typ.Callable:
"""Create a class that can be used with ui_common.run_with_progress_bar."""
class _ProgressStatusEmitter:
def __init__(self, length: int) -> None:
self.current = 0
self.length = length
def __enter__(self) -> '_ProgressStatusEmitter':
return self
def update(self, n_steps: int) -> None:
self.current += n_steps
status = ProgressStatus(self.current, self.length)
signal.emit(status)
def __exit__(self, exc_type, exc_value, tb) -> None:
status = ProgressStatus(self.length, self.length)
signal.emit(status)
return _ProgressStatusEmitter
class SeedGenerationTask(qtc.QThread):
progress = qtc.pyqtSignal(ProgressStatus)
finished = qtc.pyqtSignal(str)
def __init__(self, param_cfg: params.ParamConfig) -> None:
super().__init__()
self.param_cfg = param_cfg
def run(self) -> None:
try:
ui_common.validated_param_data(self.param_cfg)
except ValueError as err:
if err.args and isinstance(err.args[0], list):
bad_checks = err.args[0]
errmsg = "\n".join(bad_checks)
else:
errmsg = str(err)
self.finished.emit(errmsg)
return
n = 0
while True:
entropy = ui_common.get_entropy_pool_size()
if entropy < params.MIN_ENTROPY and n < params.MAX_ENTROPY_WAIT:
logger.warning(f"low on entropy ({entropy}), waiting a bit for it to accumulate")
time.sleep(1)
n += 1
else:
break
if entropy < params.MIN_ENTROPY:
errmsg = f"Not enough entropy: {entropy} < {params.MIN_ENTROPY}"
logger.error(errmsg)
self.finished.emit(errmsg)
return
salt, brainkey, shares = ui_common.create_secrets(self.param_cfg)
# NOTE (mb 2021-07-09): We could do this later in theory, but
# if the derivation of seed_data fails, the user would have
# written down their shares that are useless. Better to
# provoke any such error early on.
seed_data = ui_common.derive_seed(
self.param_cfg.kdf_params,
salt,
brainkey,
label="KDF Validation ",
init_progressbar=init_progres_status_emitter_clazz(self.progress),
)
gpb.shared_panel_state['salt' ] = salt
gpb.shared_panel_state['brainkey' ] = brainkey
gpb.shared_panel_state['shares' ] = shares
gpb.shared_panel_state['seed_data'] = seed_data
self.finished.emit("ok")
class SeedDerivationTask(qtc.QThread):
progress = qtc.pyqtSignal(ProgressStatus)
finished = qtc.pyqtSignal(str)
def __init__(
self,
param_cfg: params.ParamConfig,
salt : ct.Salt,
brainkey : ct.BrainKey,
) -> None:
super().__init__()
self.param_cfg = param_cfg
self.salt = salt
self.brainkey = brainkey
def run(self) -> None:
try:
# provoke error for invalid data
ui_common.validated_param_data(self.param_cfg)
except ValueError as err:
if err.args and isinstance(err.args[0], list):
bad_checks = err.args[0]
errmsg = "\n".join(bad_checks)
else:
errmsg = str(err)
self.finished.emit(errmsg)
return
brainkey = self.brainkey
salt = self.salt
seed_data = ui_common.derive_seed(
self.param_cfg.kdf_params,
salt,
brainkey,
label="KDF Validation ",
init_progressbar=init_progres_status_emitter_clazz(self.progress),
)
state = gpb.shared_panel_state
state['salt' ] = salt
state['brainkey' ] = brainkey
state['seed_data'] = seed_data
self.finished.emit("ok")
class ParamConfigWorker(qtc.QThread):
progress = qtc.pyqtSignal(ProgressStatus)
finished = qtc.pyqtSignal(params.ParamConfig)
def __init__(
self,
threshold : int,
num_shares : int,
parallelism : kdf.NumThreads,
memory_per_thread: kdf.MebiBytes,
target_duration : kdf.Seconds,
) -> None:
super().__init__()
self.threshold = threshold
self.num_shares = num_shares
self.parallelism = parallelism
self.memory_per_thread = memory_per_thread
self.target_duration = target_duration
def run(self) -> None:
param_cfg = ui_common.init_param_config(
target_duration=self.target_duration,
parallelism=self.parallelism,
memory_per_thread=self.memory_per_thread,
time_cost=None, # auto from target_duration
threshold=self.threshold,
num_shares=self.num_shares,
init_progressbar=init_progres_status_emitter_clazz(self.progress),
)
self.finished.emit(param_cfg)
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