43 lines
1.7 KiB
Python
43 lines
1.7 KiB
Python
# numenworld-ipcam - Reverse engineering of the NuMenWorld NCV-I536A IP camera
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# Copyright (C) 2019-2019 Johannes Bauer
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#
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# This file is part of numenworld-ipcam (https://github.com/johndoe31415/numenworld-ipcam).
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#
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# numenworld-ipcam 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; this program is ONLY licensed under
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# version 3 of the License, later versions are explicitly excluded.
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#
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# numenworld-ipcam 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 numenworld-ipcam; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Johannes Bauer <JohannesBauer@gmx.de>
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import hashlib
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class HorrificallyBrokenPasswordFunction():
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@classmethod
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def derive(self, passphrase):
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alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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assert (len(alphabet) == 62)
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passphrase = passphrase.encode("utf-8")
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hashval = hashlib.md5(passphrase).digest()
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encoded = ""
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for i in range(0, 16, 2):
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index = (hashval[i] + hashval[i + 1]) % len(alphabet)
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char = alphabet[index]
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encoded += char
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return encoded
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if __name__ == "__main__":
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assert (HorrificallyBrokenPasswordFunction.derive("") == "tlJwpbo6")
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assert (HorrificallyBrokenPasswordFunction.derive("abc") == "LkM7s2Ht")
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