CoCalc -- read_cast_128_s

Path: Boolean-Cayley-graphs/sage-code / read_cast_128_s_boxes.py
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r"""
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"""
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#*****************************************************************************
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#       Copyright (C) 2016 Paul Leopardi [email protected]
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#
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#  Distributed under the terms of the GNU General Public License (GPL)
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#  as published by the Free Software Foundation; either version 2 of
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#  the License, or (at your option) any later version.
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#                  http://www.gnu.org/licenses/
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#*****************************************************************************
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from sage.crypto.boolean_function import BooleanFunction
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def read_s_box(fil):
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    r"""
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    """
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    lis = []
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    lin = fil.readline()
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    if lin[0:5] != 'S-Box':
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        raise IOError
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    while lin not in ('','\n'):
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        lin = fil.readline()
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        if lin not in ('','\n'):
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            for n in range(8):
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                pos=n*9
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                lis.append(ZZ('0x'+lin[pos:pos+8]))
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    numlist = [num.digits(2,padto=32) for num in lis]
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    bitmatrix = matrix(numlist)
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    boolflist = [BooleanFunction(list(bitmatrix.T[n,:][0]))
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                 for n in range(32)]
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    return boolflist
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def read_s_boxes_file(fname='../CAST-128/cast-128-s-boxes.txt'):
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    r"""
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    """
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    s_box_functions = [None]
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    fil = open(fname)
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    for n in range(8):
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        s_box_functions.append(read_s_box(fil))
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    fil.close()
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    return s_box_functions
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