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trezor-firmware/tests/device_tests/misc/test_msg_getentropy.py

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# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 SatoshiLabs and contributors
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#
# 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.
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#
# 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>.
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import math
import pytest
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from trezorlib import messages as m
from trezorlib import misc
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from trezorlib.debuglink import SessionDebugWrapper as Session
ENTROPY_LENGTHS_POW2 = [2**l for l in range(10)]
ENTROPY_LENGTHS_POW2_1 = [2**l + 1 for l in range(10)]
ENTROPY_LENGTHS = ENTROPY_LENGTHS_POW2 + ENTROPY_LENGTHS_POW2_1
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def entropy(data):
counts = {}
for c in data:
counts[c] = counts.get(c, 0) + 1
e = 0
for v in counts.values():
p = v / len(data)
e -= p * math.log(p, 256)
return e
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@pytest.mark.parametrize("entropy_length", ENTROPY_LENGTHS)
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def test_entropy(session: Session, entropy_length):
with session:
session.set_expected_responses(
[m.ButtonRequest(code=m.ButtonRequestType.ProtectCall), m.Entropy]
)
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ent = misc.get_entropy(session, entropy_length)
assert len(ent) == entropy_length
print(f"{entropy_length} bytes: entropy = {entropy(ent)}")