# This file is part of lascar
#
# lascar is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 GNU Lesser General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#
# Copyright 2018 Manuel San Pedro, Victor Servant, Charles Guillemet, Ledger SAS - manuel.sanpedro@ledger.fr, victor.servant@ledger.fr, charles@ledger.fr
import numpy as np
import itertools
from . import PartitionerEngine
[docs]class DomEngine(PartitionerEngine):
"""
TtestEngine is a PartitionerEngine used to compute Welch's T-test on Side-Channel Traces
(Gilbert Goodwill, Benjamin Jun, Josh Jaffe, and Pankaj Rohatgi. A
testing methodology for side channel resistance validation. NIST noninvasive
attack testing workshop, 2011. http://csrc.nist.gov/news_events/
non-invasive-attack-testing-workshop/papers/08_Goodwill.pdf.)
It needs as en input a partition_function that will take trace values as an input and returns 0 or 1
(2 partitions_values).
"""
def __init__(self, partition_function, name=None):
"""
:param name:
:param partition_function: partition_function that will take trace values as an input and returns 0 or 1
"""
PartitionerEngine.__init__(self, partition_function, range(2), 2, name=name)
self.logger.debug('Creating DomEngine "%s". ' % (name))
def _finalize(self):
m0 = self._acc_x_by_partition[0, 0] / self._partition_count[0]
m1 = self._acc_x_by_partition[0, 1] / self._partition_count[1]
return np.sqrt((m0-m1)**2)