test/sca/test_match.py


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from unittest import TestCase

import numpy as np

from pyecsca.sca import Trace, match_pattern, match_part, pad
from .utils import Plottable


class MatchingTests(Plottable):
    def test_simple_match(self):
        pattern = Trace(
            np.array([1, 15, 12, -10, 0, 13, 17, -1, 0], dtype=np.dtype("i1")), None
        )
        base = Trace(
            np.array(
                [0, 1, 3, 1, 2, -2, -3, 1, 15, 12, -10, 0, 13, 17, -1, 0, 3, 1],
                dtype=np.dtype("i1"),
            ),
            None,
        )
        filtered = match_part(base, 7, 9)
        self.assertListEqual(filtered, [7])
        self.plot(base=base, pattern=pad(pattern, (filtered[0], 0)))

    def test_multiple_match(self):
        pattern = Trace(
            np.array([1, 15, 12, -10, 0, 13, 17, -1, 0], dtype=np.dtype("i1")), None
        )
        base = Trace(
            np.array(
                [
                    0,
                    1,
                    3,
                    1,
                    2,
                    -2,
                    -3,
                    1,
                    18,
                    10,
                    -5,
                    0,
                    13,
                    17,
                    -1,
                    0,
                    3,
                    1,
                    2,
                    5,
                    13,
                    8,
                    -8,
                    1,
                    11,
                    15,
                    0,
                    1,
                    5,
                    2,
                    4,
                ],
                dtype=np.dtype("i1"),
            ),
            None,
        )
        filtered = match_pattern(base, pattern, 0.9)
        self.assertListEqual(filtered, [7, 19])
        self.plot(
            base=base,
            pattern1=pad(pattern, (filtered[0], 0)),
            pattern2=pad(pattern, (filtered[1], 0)),
        )