46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
# tsuserver3, an Attorney Online server
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#
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# Copyright (C) 2016 argoneus <argoneuscze@gmail.com>
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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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# fantacrypt was a mistake, just hardcoding some numbers is good enough
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import binascii
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CRYPT_CONST_1 = 53761
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CRYPT_CONST_2 = 32618
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CRYPT_KEY = 5
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def fanta_decrypt(data):
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data_bytes = [int(data[x:x + 2], 16) for x in range(0, len(data), 2)]
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key = CRYPT_KEY
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ret = ''
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for byte in data_bytes:
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val = byte ^ ((key & 0xffff) >> 8)
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ret += chr(val)
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key = ((byte + key) * CRYPT_CONST_1) + CRYPT_CONST_2
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return ret
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def fanta_encrypt(data):
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key = CRYPT_KEY
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ret = ''
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for char in data:
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val = ord(char) ^ ((key & 0xffff) >> 8)
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ret += binascii.hexlify(val.to_bytes(1, byteorder='big')).decode().upper()
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key = ((val + key) * CRYPT_CONST_1) + CRYPT_CONST_2
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return ret
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