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https://github.com/trezor/trezor-firmware.git
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51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
# 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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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import math
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import pytest
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from trezorlib import messages as m
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from trezorlib import misc
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from trezorlib.debuglink import SessionDebugWrapper as Session
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ENTROPY_LENGTHS_POW2 = [2**l for l in range(10)]
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ENTROPY_LENGTHS_POW2_1 = [2**l + 1 for l in range(10)]
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ENTROPY_LENGTHS = ENTROPY_LENGTHS_POW2 + ENTROPY_LENGTHS_POW2_1
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def entropy(data):
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counts = {}
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for c in data:
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counts[c] = counts.get(c, 0) + 1
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e = 0
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for v in counts.values():
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p = v / len(data)
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e -= p * math.log(p, 256)
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return e
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@pytest.mark.parametrize("entropy_length", ENTROPY_LENGTHS)
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def test_entropy(session: Session, entropy_length):
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with session:
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session.set_expected_responses(
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[m.ButtonRequest(code=m.ButtonRequestType.ProtectCall), m.Entropy]
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)
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ent = misc.get_entropy(session, entropy_length)
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assert len(ent) == entropy_length
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print(f"{entropy_length} bytes: entropy = {entropy(ent)}")
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