54 lines
1.5 KiB
Python
Executable File
54 lines
1.5 KiB
Python
Executable File
#!/usr/bin/python3
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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""" KCPassword Xor """
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# MSc Project in Royal Holloway, University of London.
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__author__ = 'Joaquin Moreno Garijo (bastionado@gmail.com)'
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import sys
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magic_static='7d895223d2bcddeaa3b91f'
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pwd = ''
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if len(sys.argv) != 2:
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print( 'Please write as a first argv the hexadecimal kcpassword value:' )
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print( 'Example: python {} 1ceb3147d2172f1140ff63bf'.format(sys.argv[0]) )
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exit(1)
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kcpasswd=sys.argv[1]
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print( '\n\tKcpasswd: 0x{}.'.format(kcpasswd) )
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print( '\tMagic Xor: 0x{}.'.format(magic_static) )
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tam_xor = len(magic_static)
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tam = len(kcpasswd) - tam_xor
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magic = magic_static
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while tam > 0:
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tam -= tam_xor
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magic += magic_static
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print( '\tUsed Magic Xor: 0x{}.'.format(magic) )
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i = 0
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while i < len(kcpasswd):
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charkc = kcpasswd[i] + kcpasswd[i+1]
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charkch = int(charkc, 16)
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charm = magic[i] + magic[i+1]
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charmh = int(charm, 16)
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r = charkch ^ charmh
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pwd += chr(r)
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if r == 0:
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print( '\n\tThe password is: "{}".\n'.format(pwd.rstrip('\0')) )
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break
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i += 2
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exit(0)
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