trezor-firmware/tests/device_tests/common.py

# This file is part of the Trezor project.
#
# Copyright (C) 2012-2019 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# 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 License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.


# fmt: off
#                1      2     3    4      5      6      7     8      9    10    11    12
MNEMONIC12 = "alcohol woman abuse must during monitor noble actual mixed trade anger aisle"
MNEMONIC18 = "owner little vague addict embark decide pink prosper true fork panda embody mixture exchange choose canoe electric jewel"
MNEMONIC24 = "dignity pass list indicate nasty swamp pool script soccer toe leaf photo multiply desk host tomato cradle drill spread actor shine dismiss champion exotic"
MNEMONIC_ALLALLALL = " ".join(["all"] * 12)
# fmt: on


class TrezorTest:
    mnemonic12 = MNEMONIC12
    mnemonic18 = MNEMONIC18
    mnemonic24 = MNEMONIC24
    mnemonic_all = MNEMONIC_ALLALLALL

    pin4 = "1234"
    pin6 = "789456"
    pin8 = "45678978"


def generate_entropy(strength, internal_entropy, external_entropy):
    """
    strength - length of produced seed. One of 128, 192, 256
    random - binary stream of random data from external HRNG
    """
    import hashlib

    if strength not in (128, 192, 256):
        raise ValueError("Invalid strength")

    if not internal_entropy:
        raise ValueError("Internal entropy is not provided")

    if len(internal_entropy) < 32:
        raise ValueError("Internal entropy too short")

    if not external_entropy:
        raise ValueError("External entropy is not provided")

    if len(external_entropy) < 32:
        raise ValueError("External entropy too short")

    entropy = hashlib.sha256(internal_entropy + external_entropy).digest()
    entropy_stripped = entropy[: strength // 8]

    if len(entropy_stripped) * 8 != strength:
        raise ValueError("Entropy length mismatch")

    return entropy_stripped