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#! /usr/bin/python3 |
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# Copyright (C) 2018 Karim Kanso. All Rights Reserved. |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program 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 General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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import sys |
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words = 8 |
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def err() : |
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print("Usage: ", sys.argv[0], " ", end="", file=sys.stderr) |
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for i in range(words) : |
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print("hh ll ", end="", file=sys.stderr) |
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print("", file=sys.stderr) |
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print("Calculates the cookie for cisco routers, copy the {} words from the cookie onto the command line.\n\thh = high byte in hex\n\tll = low byte in hex".format(words)) |
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sys.exit(1) |
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def main() : |
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if len(sys.argv) != words * 2 + 1 : |
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err() |
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accumulator = 0 |
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try : |
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for i in range(words) : |
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h = int(sys.argv[1 + i * 2], base=16) |
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l = int(sys.argv[(i+1) * 2], base=16) |
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w = l + (h << 8) |
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accumulator += w |
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except ValueError as ve : |
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print("Unable to process cookie value: {}".format(ve), file=sys.stderr) |
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err() |
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result = "{0:x}".format(accumulator) |
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if len(result) < 4 : |
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print("Error, failed to calculate accumulator of sufficient size: {}".format(result), file=sys.stderr) |
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err() |
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print("Done, result: ", result[-4:]) |
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if __name__ == "__main__" : |
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main() |
