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Code Editor : des.py
"""passlib.crypto.des -- DES block encryption routines History ======= These routines (which have since been drastically modified for python) are based on a Java implementation of the des-crypt algorithm, found at `<http://www.dynamic.net.au/christos/crypt/UnixCrypt2.txt>`_. The copyright & license for that source is as follows:: UnixCrypt.java 0.9 96/11/25 Copyright (c) 1996 Aki Yoshida. All rights reserved. Permission to use, copy, modify and distribute this software for non-commercial or commercial purposes and without fee is hereby granted provided that this copyright notice appears in all copies. --- Unix crypt(3C) utility @version 0.9, 11/25/96 @author Aki Yoshida --- modified April 2001 by Iris Van den Broeke, Daniel Deville --- Unix Crypt. Implements the one way cryptography used by Unix systems for simple password protection. @version $Id: UnixCrypt2.txt,v 1.1.1.1 2005/09/13 22:20:13 christos Exp $ @author Greg Wilkins (gregw) The netbsd des-crypt implementation has some nice notes on how this all works - http://fxr.googlebit.com/source/lib/libcrypt/crypt.c?v=NETBSD-CURRENT """ # TODO: could use an accelerated C version of this module to speed up lmhash, # des-crypt, and ext-des-crypt #============================================================================= # imports #============================================================================= # core import struct # pkg from passlib import exc from passlib.utils.compat import join_byte_values, byte_elem_value, \ irange, irange, int_types # local __all__ = [ "expand_des_key", "des_encrypt_block", ] #============================================================================= # constants #============================================================================= # masks/upper limits for various integer sizes INT_24_MASK = 0xffffff INT_56_MASK = 0xffffffffffffff INT_64_MASK = 0xffffffffffffffff # mask to clear parity bits from 64-bit key _KDATA_MASK = 0xfefefefefefefefe _KPARITY_MASK = 0x0101010101010101 # mask used to setup key schedule _KS_MASK = 0xfcfcfcfcffffffff #============================================================================= # static DES tables #============================================================================= # placeholders filled in by _load_tables() PCXROT = IE3264 = SPE = CF6464 = None def _load_tables(): """delay loading tables until they are actually needed""" global PCXROT, IE3264, SPE, CF6464 #--------------------------------------------------------------- # Initial key schedule permutation # PC1ROT - bit reverse, then PC1, then Rotate, then PC2 #--------------------------------------------------------------- # NOTE: this was reordered from original table to make perm3264 logic simpler PC1ROT=( ( 0x0000000000000000, 0x0000000000000000, 0x0000000000002000, 0x0000000000002000, 0x0000000000000020, 0x0000000000000020, 0x0000000000002020, 0x0000000000002020, 0x0000000000000400, 0x0000000000000400, 0x0000000000002400, 0x0000000000002400, 0x0000000000000420, 0x0000000000000420, 0x0000000000002420, 0x0000000000002420, ), ( 0x0000000000000000, 0x2000000000000000, 0x0000000400000000, 0x2000000400000000, 0x0000800000000000, 0x2000800000000000, 0x0000800400000000, 0x2000800400000000, 0x0008000000000000, 0x2008000000000000, 0x0008000400000000, 0x2008000400000000, 0x0008800000000000, 0x2008800000000000, 0x0008800400000000, 0x2008800400000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000040, 0x0000000000000040, 0x0000000020000000, 0x0000000020000000, 0x0000000020000040, 0x0000000020000040, 0x0000000000200000, 0x0000000000200000, 0x0000000000200040, 0x0000000000200040, 0x0000000020200000, 0x0000000020200000, 0x0000000020200040, 0x0000000020200040, ), ( 0x0000000000000000, 0x0002000000000000, 0x0800000000000000, 0x0802000000000000, 0x0100000000000000, 0x0102000000000000, 0x0900000000000000, 0x0902000000000000, 0x4000000000000000, 0x4002000000000000, 0x4800000000000000, 0x4802000000000000, 0x4100000000000000, 0x4102000000000000, 0x4900000000000000, 0x4902000000000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000040000, 0x0000000000040000, 0x0000020000000000, 0x0000020000000000, 0x0000020000040000, 0x0000020000040000, 0x0000000000000004, 0x0000000000000004, 0x0000000000040004, 0x0000000000040004, 0x0000020000000004, 0x0000020000000004, 0x0000020000040004, 0x0000020000040004, ), ( 0x0000000000000000, 0x0000400000000000, 0x0200000000000000, 0x0200400000000000, 0x0080000000000000, 0x0080400000000000, 0x0280000000000000, 0x0280400000000000, 0x0000008000000000, 0x0000408000000000, 0x0200008000000000, 0x0200408000000000, 0x0080008000000000, 0x0080408000000000, 0x0280008000000000, 0x0280408000000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000010000000, 0x0000000010000000, 0x0000000000001000, 0x0000000000001000, 0x0000000010001000, 0x0000000010001000, 0x0000000040000000, 0x0000000040000000, 0x0000000050000000, 0x0000000050000000, 0x0000000040001000, 0x0000000040001000, 0x0000000050001000, 0x0000000050001000, ), ( 0x0000000000000000, 0x0000001000000000, 0x0000080000000000, 0x0000081000000000, 0x1000000000000000, 0x1000001000000000, 0x1000080000000000, 0x1000081000000000, 0x0004000000000000, 0x0004001000000000, 0x0004080000000000, 0x0004081000000000, 0x1004000000000000, 0x1004001000000000, 0x1004080000000000, 0x1004081000000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000080, 0x0000000000000080, 0x0000000000080000, 0x0000000000080000, 0x0000000000080080, 0x0000000000080080, 0x0000000000800000, 0x0000000000800000, 0x0000000000800080, 0x0000000000800080, 0x0000000000880000, 0x0000000000880000, 0x0000000000880080, 0x0000000000880080, ), ( 0x0000000000000000, 0x0000000008000000, 0x0000002000000000, 0x0000002008000000, 0x0000100000000000, 0x0000100008000000, 0x0000102000000000, 0x0000102008000000, 0x0000200000000000, 0x0000200008000000, 0x0000202000000000, 0x0000202008000000, 0x0000300000000000, 0x0000300008000000, 0x0000302000000000, 0x0000302008000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000400000, 0x0000000000400000, 0x0000000004000000, 0x0000000004000000, 0x0000000004400000, 0x0000000004400000, 0x0000000000000800, 0x0000000000000800, 0x0000000000400800, 0x0000000000400800, 0x0000000004000800, 0x0000000004000800, 0x0000000004400800, 0x0000000004400800, ), ( 0x0000000000000000, 0x0000000000008000, 0x0040000000000000, 0x0040000000008000, 0x0000004000000000, 0x0000004000008000, 0x0040004000000000, 0x0040004000008000, 0x8000000000000000, 0x8000000000008000, 0x8040000000000000, 0x8040000000008000, 0x8000004000000000, 0x8000004000008000, 0x8040004000000000, 0x8040004000008000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000004000, 0x0000000000004000, 0x0000000000000008, 0x0000000000000008, 0x0000000000004008, 0x0000000000004008, 0x0000000000000010, 0x0000000000000010, 0x0000000000004010, 0x0000000000004010, 0x0000000000000018, 0x0000000000000018, 0x0000000000004018, 0x0000000000004018, ), ( 0x0000000000000000, 0x0000000200000000, 0x0001000000000000, 0x0001000200000000, 0x0400000000000000, 0x0400000200000000, 0x0401000000000000, 0x0401000200000000, 0x0020000000000000, 0x0020000200000000, 0x0021000000000000, 0x0021000200000000, 0x0420000000000000, 0x0420000200000000, 0x0421000000000000, 0x0421000200000000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000010000000000, 0x0000010000000000, 0x0000000100000000, 0x0000000100000000, 0x0000010100000000, 0x0000010100000000, 0x0000000000100000, 0x0000000000100000, 0x0000010000100000, 0x0000010000100000, 0x0000000100100000, 0x0000000100100000, 0x0000010100100000, 0x0000010100100000, ), ( 0x0000000000000000, 0x0000000080000000, 0x0000040000000000, 0x0000040080000000, 0x0010000000000000, 0x0010000080000000, 0x0010040000000000, 0x0010040080000000, 0x0000000800000000, 0x0000000880000000, 0x0000040800000000, 0x0000040880000000, 0x0010000800000000, 0x0010000880000000, 0x0010040800000000, 0x0010040880000000, ), ) #--------------------------------------------------------------- # Subsequent key schedule rotation permutations # PC2ROT - PC2 inverse, then Rotate, then PC2 #--------------------------------------------------------------- # NOTE: this was reordered from original table to make perm3264 logic simpler PC2ROTA=( ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000200000, 0x0000000000200000, 0x0000000000200000, 0x0000000000200000, 0x0000000004000000, 0x0000000004000000, 0x0000000004000000, 0x0000000004000000, 0x0000000004200000, 0x0000000004200000, 0x0000000004200000, 0x0000000004200000, ), ( 0x0000000000000000, 0x0000000000000800, 0x0000010000000000, 0x0000010000000800, 0x0000000000002000, 0x0000000000002800, 0x0000010000002000, 0x0000010000002800, 0x0000000010000000, 0x0000000010000800, 0x0000010010000000, 0x0000010010000800, 0x0000000010002000, 0x0000000010002800, 0x0000010010002000, 0x0000010010002800, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000100000000, 0x0000000100000000, 0x0000000100000000, 0x0000000100000000, 0x0000000000800000, 0x0000000000800000, 0x0000000000800000, 0x0000000000800000, 0x0000000100800000, 0x0000000100800000, 0x0000000100800000, 0x0000000100800000, ), ( 0x0000000000000000, 0x0000020000000000, 0x0000000080000000, 0x0000020080000000, 0x0000000000400000, 0x0000020000400000, 0x0000000080400000, 0x0000020080400000, 0x0000000008000000, 0x0000020008000000, 0x0000000088000000, 0x0000020088000000, 0x0000000008400000, 0x0000020008400000, 0x0000000088400000, 0x0000020088400000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000040, 0x0000000000000040, 0x0000000000000040, 0x0000000000000040, 0x0000000000001000, 0x0000000000001000, 0x0000000000001000, 0x0000000000001000, 0x0000000000001040, 0x0000000000001040, 0x0000000000001040, 0x0000000000001040, ), ( 0x0000000000000000, 0x0000000000000010, 0x0000000000000400, 0x0000000000000410, 0x0000000000000080, 0x0000000000000090, 0x0000000000000480, 0x0000000000000490, 0x0000000040000000, 0x0000000040000010, 0x0000000040000400, 0x0000000040000410, 0x0000000040000080, 0x0000000040000090, 0x0000000040000480, 0x0000000040000490, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000080000, 0x0000000000080000, 0x0000000000080000, 0x0000000000080000, 0x0000000000100000, 0x0000000000100000, 0x0000000000100000, 0x0000000000100000, 0x0000000000180000, 0x0000000000180000, 0x0000000000180000, 0x0000000000180000, ), ( 0x0000000000000000, 0x0000000000040000, 0x0000000000000020, 0x0000000000040020, 0x0000000000000004, 0x0000000000040004, 0x0000000000000024, 0x0000000000040024, 0x0000000200000000, 0x0000000200040000, 0x0000000200000020, 0x0000000200040020, 0x0000000200000004, 0x0000000200040004, 0x0000000200000024, 0x0000000200040024, ), ( 0x0000000000000000, 0x0000000000000008, 0x0000000000008000, 0x0000000000008008, 0x0010000000000000, 0x0010000000000008, 0x0010000000008000, 0x0010000000008008, 0x0020000000000000, 0x0020000000000008, 0x0020000000008000, 0x0020000000008008, 0x0030000000000000, 0x0030000000000008, 0x0030000000008000, 0x0030000000008008, ), ( 0x0000000000000000, 0x0000400000000000, 0x0000080000000000, 0x0000480000000000, 0x0000100000000000, 0x0000500000000000, 0x0000180000000000, 0x0000580000000000, 0x4000000000000000, 0x4000400000000000, 0x4000080000000000, 0x4000480000000000, 0x4000100000000000, 0x4000500000000000, 0x4000180000000000, 0x4000580000000000, ), ( 0x0000000000000000, 0x0000000000004000, 0x0000000020000000, 0x0000000020004000, 0x0001000000000000, 0x0001000000004000, 0x0001000020000000, 0x0001000020004000, 0x0200000000000000, 0x0200000000004000, 0x0200000020000000, 0x0200000020004000, 0x0201000000000000, 0x0201000000004000, 0x0201000020000000, 0x0201000020004000, ), ( 0x0000000000000000, 0x1000000000000000, 0x0004000000000000, 0x1004000000000000, 0x0002000000000000, 0x1002000000000000, 0x0006000000000000, 0x1006000000000000, 0x0000000800000000, 0x1000000800000000, 0x0004000800000000, 0x1004000800000000, 0x0002000800000000, 0x1002000800000000, 0x0006000800000000, 0x1006000800000000, ), ( 0x0000000000000000, 0x0040000000000000, 0x2000000000000000, 0x2040000000000000, 0x0000008000000000, 0x0040008000000000, 0x2000008000000000, 0x2040008000000000, 0x0000001000000000, 0x0040001000000000, 0x2000001000000000, 0x2040001000000000, 0x0000009000000000, 0x0040009000000000, 0x2000009000000000, 0x2040009000000000, ), ( 0x0000000000000000, 0x0400000000000000, 0x8000000000000000, 0x8400000000000000, 0x0000002000000000, 0x0400002000000000, 0x8000002000000000, 0x8400002000000000, 0x0100000000000000, 0x0500000000000000, 0x8100000000000000, 0x8500000000000000, 0x0100002000000000, 0x0500002000000000, 0x8100002000000000, 0x8500002000000000, ), ( 0x0000000000000000, 0x0000800000000000, 0x0800000000000000, 0x0800800000000000, 0x0000004000000000, 0x0000804000000000, 0x0800004000000000, 0x0800804000000000, 0x0000000400000000, 0x0000800400000000, 0x0800000400000000, 0x0800800400000000, 0x0000004400000000, 0x0000804400000000, 0x0800004400000000, 0x0800804400000000, ), ( 0x0000000000000000, 0x0080000000000000, 0x0000040000000000, 0x0080040000000000, 0x0008000000000000, 0x0088000000000000, 0x0008040000000000, 0x0088040000000000, 0x0000200000000000, 0x0080200000000000, 0x0000240000000000, 0x0080240000000000, 0x0008200000000000, 0x0088200000000000, 0x0008240000000000, 0x0088240000000000, ), ) # NOTE: this was reordered from original table to make perm3264 logic simpler PC2ROTB=( ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000400, 0x0000000000000400, 0x0000000000000400, 0x0000000000000400, 0x0000000000080000, 0x0000000000080000, 0x0000000000080000, 0x0000000000080000, 0x0000000000080400, 0x0000000000080400, 0x0000000000080400, 0x0000000000080400, ), ( 0x0000000000000000, 0x0000000000800000, 0x0000000000004000, 0x0000000000804000, 0x0000000080000000, 0x0000000080800000, 0x0000000080004000, 0x0000000080804000, 0x0000000000040000, 0x0000000000840000, 0x0000000000044000, 0x0000000000844000, 0x0000000080040000, 0x0000000080840000, 0x0000000080044000, 0x0000000080844000, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000008, 0x0000000000000008, 0x0000000000000008, 0x0000000000000008, 0x0000000040000000, 0x0000000040000000, 0x0000000040000000, 0x0000000040000000, 0x0000000040000008, 0x0000000040000008, 0x0000000040000008, 0x0000000040000008, ), ( 0x0000000000000000, 0x0000000020000000, 0x0000000200000000, 0x0000000220000000, 0x0000000000000080, 0x0000000020000080, 0x0000000200000080, 0x0000000220000080, 0x0000000000100000, 0x0000000020100000, 0x0000000200100000, 0x0000000220100000, 0x0000000000100080, 0x0000000020100080, 0x0000000200100080, 0x0000000220100080, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000002000, 0x0000000000002000, 0x0000000000002000, 0x0000000000002000, 0x0000020000000000, 0x0000020000000000, 0x0000020000000000, 0x0000020000000000, 0x0000020000002000, 0x0000020000002000, 0x0000020000002000, 0x0000020000002000, ), ( 0x0000000000000000, 0x0000000000000800, 0x0000000100000000, 0x0000000100000800, 0x0000000010000000, 0x0000000010000800, 0x0000000110000000, 0x0000000110000800, 0x0000000000000004, 0x0000000000000804, 0x0000000100000004, 0x0000000100000804, 0x0000000010000004, 0x0000000010000804, 0x0000000110000004, 0x0000000110000804, ), ( 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000001000, 0x0000000000001000, 0x0000000000001000, 0x0000000000001000, 0x0000000000000010, 0x0000000000000010, 0x0000000000000010, 0x0000000000000010, 0x0000000000001010, 0x0000000000001010, 0x0000000000001010, 0x0000000000001010, ), ( 0x0000000000000000, 0x0000000000000040, 0x0000010000000000, 0x0000010000000040, 0x0000000000200000, 0x0000000000200040, 0x0000010000200000, 0x0000010000200040, 0x0000000000008000, 0x0000000000008040, 0x0000010000008000, 0x0000010000008040, 0x0000000000208000, 0x0000000000208040, 0x0000010000208000, 0x0000010000208040, ), ( 0x0000000000000000, 0x0000000004000000, 0x0000000008000000, 0x000000000c000000, 0x0400000000000000, 0x0400000004000000, 0x0400000008000000, 0x040000000c000000, 0x8000000000000000, 0x8000000004000000, 0x8000000008000000, 0x800000000c000000, 0x8400000000000000, 0x8400000004000000, 0x8400000008000000, 0x840000000c000000, ), ( 0x0000000000000000, 0x0002000000000000, 0x0200000000000000, 0x0202000000000000, 0x1000000000000000, 0x1002000000000000, 0x1200000000000000, 0x1202000000000000, 0x0008000000000000, 0x000a000000000000, 0x0208000000000000, 0x020a000000000000, 0x1008000000000000, 0x100a000000000000, 0x1208000000000000, 0x120a000000000000, ), ( 0x0000000000000000, 0x0000000000400000, 0x0000000000000020, 0x0000000000400020, 0x0040000000000000, 0x0040000000400000, 0x0040000000000020, 0x0040000000400020, 0x0800000000000000, 0x0800000000400000, 0x0800000000000020, 0x0800000000400020, 0x0840000000000000, 0x0840000000400000, 0x0840000000000020, 0x0840000000400020, ), ( 0x0000000000000000, 0x0080000000000000, 0x0000008000000000, 0x0080008000000000, 0x2000000000000000, 0x2080000000000000, 0x2000008000000000, 0x2080008000000000, 0x0020000000000000, 0x00a0000000000000, 0x0020008000000000, 0x00a0008000000000, 0x2020000000000000, 0x20a0000000000000, 0x2020008000000000, 0x20a0008000000000, ), ( 0x0000000000000000, 0x0000002000000000, 0x0000040000000000, 0x0000042000000000, 0x4000000000000000, 0x4000002000000000, 0x4000040000000000, 0x4000042000000000, 0x0000400000000000, 0x0000402000000000, 0x0000440000000000, 0x0000442000000000, 0x4000400000000000, 0x4000402000000000, 0x4000440000000000, 0x4000442000000000, ), ( 0x0000000000000000, 0x0000004000000000, 0x0000200000000000, 0x0000204000000000, 0x0000080000000000, 0x0000084000000000, 0x0000280000000000, 0x0000284000000000, 0x0000800000000000, 0x0000804000000000, 0x0000a00000000000, 0x0000a04000000000, 0x0000880000000000, 0x0000884000000000, 0x0000a80000000000, 0x0000a84000000000, ), ( 0x0000000000000000, 0x0000000800000000, 0x0000000400000000, 0x0000000c00000000, 0x0000100000000000, 0x0000100800000000, 0x0000100400000000, 0x0000100c00000000, 0x0010000000000000, 0x0010000800000000, 0x0010000400000000, 0x0010000c00000000, 0x0010100000000000, 0x0010100800000000, 0x0010100400000000, 0x0010100c00000000, ), ( 0x0000000000000000, 0x0100000000000000, 0x0001000000000000, 0x0101000000000000, 0x0000001000000000, 0x0100001000000000, 0x0001001000000000, 0x0101001000000000, 0x0004000000000000, 0x0104000000000000, 0x0005000000000000, 0x0105000000000000, 0x0004001000000000, 0x0104001000000000, 0x0005001000000000, 0x0105001000000000, ), ) #--------------------------------------------------------------- # PCXROT - PC1ROT, PC2ROTA, PC2ROTB listed in order # of the PC1 rotation schedule, as used by des_setkey #--------------------------------------------------------------- ##ROTATES = (1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1) ##PCXROT = ( ## PC1ROT, PC2ROTA, PC2ROTB, PC2ROTB, ## PC2ROTB, PC2ROTB, PC2ROTB, PC2ROTB, ## PC2ROTA, PC2ROTB, PC2ROTB, PC2ROTB, ## PC2ROTB, PC2ROTB, PC2ROTB, PC2ROTA, ## ) # NOTE: modified PCXROT to contain entrys broken into pairs, # to help generate them in format best used by encoder. PCXROT = ( (PC1ROT, PC2ROTA), (PC2ROTB, PC2ROTB), (PC2ROTB, PC2ROTB), (PC2ROTB, PC2ROTB), (PC2ROTA, PC2ROTB), (PC2ROTB, PC2ROTB), (PC2ROTB, PC2ROTB), (PC2ROTB, PC2ROTA), ) #--------------------------------------------------------------- # Bit reverse, intial permupation, expantion # Initial permutation/expansion table #--------------------------------------------------------------- # NOTE: this was reordered from original table to make perm3264 logic simpler IE3264=( ( 0x0000000000000000, 0x0000000000800800, 0x0000000000008008, 0x0000000000808808, 0x0000008008000000, 0x0000008008800800, 0x0000008008008008, 0x0000008008808808, 0x0000000080080000, 0x0000000080880800, 0x0000000080088008, 0x0000000080888808, 0x0000008088080000, 0x0000008088880800, 0x0000008088088008, 0x0000008088888808, ), ( 0x0000000000000000, 0x0080080000000000, 0x0000800800000000, 0x0080880800000000, 0x0800000000000080, 0x0880080000000080, 0x0800800800000080, 0x0880880800000080, 0x8008000000000000, 0x8088080000000000, 0x8008800800000000, 0x8088880800000000, 0x8808000000000080, 0x8888080000000080, 0x8808800800000080, 0x8888880800000080, ), ( 0x0000000000000000, 0x0000000000001000, 0x0000000000000010, 0x0000000000001010, 0x0000000010000000, 0x0000000010001000, 0x0000000010000010, 0x0000000010001010, 0x0000000000100000, 0x0000000000101000, 0x0000000000100010, 0x0000000000101010, 0x0000000010100000, 0x0000000010101000, 0x0000000010100010, 0x0000000010101010, ), ( 0x0000000000000000, 0x0000100000000000, 0x0000001000000000, 0x0000101000000000, 0x1000000000000000, 0x1000100000000000, 0x1000001000000000, 0x1000101000000000, 0x0010000000000000, 0x0010100000000000, 0x0010001000000000, 0x0010101000000000, 0x1010000000000000, 0x1010100000000000, 0x1010001000000000, 0x1010101000000000, ), ( 0x0000000000000000, 0x0000000000002000, 0x0000000000000020, 0x0000000000002020, 0x0000000020000000, 0x0000000020002000, 0x0000000020000020, 0x0000000020002020, 0x0000000000200000, 0x0000000000202000, 0x0000000000200020, 0x0000000000202020, 0x0000000020200000, 0x0000000020202000, 0x0000000020200020, 0x0000000020202020, ), ( 0x0000000000000000, 0x0000200000000000, 0x0000002000000000, 0x0000202000000000, 0x2000000000000000, 0x2000200000000000, 0x2000002000000000, 0x2000202000000000, 0x0020000000000000, 0x0020200000000000, 0x0020002000000000, 0x0020202000000000, 0x2020000000000000, 0x2020200000000000, 0x2020002000000000, 0x2020202000000000, ), ( 0x0000000000000000, 0x0000000000004004, 0x0400000000000040, 0x0400000000004044, 0x0000000040040000, 0x0000000040044004, 0x0400000040040040, 0x0400000040044044, 0x0000000000400400, 0x0000000000404404, 0x0400000000400440, 0x0400000000404444, 0x0000000040440400, 0x0000000040444404, 0x0400000040440440, 0x0400000040444444, ), ( 0x0000000000000000, 0x0000400400000000, 0x0000004004000000, 0x0000404404000000, 0x4004000000000000, 0x4004400400000000, 0x4004004004000000, 0x4004404404000000, 0x0040040000000000, 0x0040440400000000, 0x0040044004000000, 0x0040444404000000, 0x4044040000000000, 0x4044440400000000, 0x4044044004000000, 0x4044444404000000, ), ) #--------------------------------------------------------------- # Table that combines the S, P, and E operations. #--------------------------------------------------------------- SPE=( ( 0x0080088008200000, 0x0000008008000000, 0x0000000000200020, 0x0080088008200020, 0x0000000000200000, 0x0080088008000020, 0x0000008008000020, 0x0000000000200020, 0x0080088008000020, 0x0080088008200000, 0x0000008008200000, 0x0080080000000020, 0x0080080000200020, 0x0000000000200000, 0x0000000000000000, 0x0000008008000020, 0x0000008008000000, 0x0000000000000020, 0x0080080000200000, 0x0080088008000000, 0x0080088008200020, 0x0000008008200000, 0x0080080000000020, 0x0080080000200000, 0x0000000000000020, 0x0080080000000000, 0x0080088008000000, 0x0000008008200020, 0x0080080000000000, 0x0080080000200020, 0x0000008008200020, 0x0000000000000000, 0x0000000000000000, 0x0080088008200020, 0x0080080000200000, 0x0000008008000020, 0x0080088008200000, 0x0000008008000000, 0x0080080000000020, 0x0080080000200000, 0x0000008008200020, 0x0080080000000000, 0x0080088008000000, 0x0000000000200020, 0x0080088008000020, 0x0000000000000020, 0x0000000000200020, 0x0000008008200000, 0x0080088008200020, 0x0080088008000000, 0x0000008008200000, 0x0080080000200020, 0x0000000000200000, 0x0080080000000020, 0x0000008008000020, 0x0000000000000000, 0x0000008008000000, 0x0000000000200000, 0x0080080000200020, 0x0080088008200000, 0x0000000000000020, 0x0000008008200020, 0x0080080000000000, 0x0080088008000020, ), ( 0x1000800810004004, 0x0000000000000000, 0x0000800810000000, 0x0000000010004004, 0x1000000000004004, 0x1000800800000000, 0x0000800800004004, 0x0000800810000000, 0x0000800800000000, 0x1000000010004004, 0x1000000000000000, 0x0000800800004004, 0x1000000010000000, 0x0000800810004004, 0x0000000010004004, 0x1000000000000000, 0x0000000010000000, 0x1000800800004004, 0x1000000010004004, 0x0000800800000000, 0x1000800810000000, 0x0000000000004004, 0x0000000000000000, 0x1000000010000000, 0x1000800800004004, 0x1000800810000000, 0x0000800810004004, 0x1000000000004004, 0x0000000000004004, 0x0000000010000000, 0x1000800800000000, 0x1000800810004004, 0x1000000010000000, 0x0000800810004004, 0x0000800800004004, 0x1000800810000000, 0x1000800810004004, 0x1000000010000000, 0x1000000000004004, 0x0000000000000000, 0x0000000000004004, 0x1000800800000000, 0x0000000010000000, 0x1000000010004004, 0x0000800800000000, 0x0000000000004004, 0x1000800810000000, 0x1000800800004004, 0x0000800810004004, 0x0000800800000000, 0x0000000000000000, 0x1000000000004004, 0x1000000000000000, 0x1000800810004004, 0x0000800810000000, 0x0000000010004004, 0x1000000010004004, 0x0000000010000000, 0x1000800800000000, 0x0000800800004004, 0x1000800800004004, 0x1000000000000000, 0x0000000010004004, 0x0000800810000000, ), ( 0x0000000000400410, 0x0010004004400400, 0x0010000000000000, 0x0010000000400410, 0x0000004004000010, 0x0000000000400400, 0x0010000000400410, 0x0010004004000000, 0x0010000000400400, 0x0000004004000000, 0x0000004004400400, 0x0000000000000010, 0x0010004004400410, 0x0010000000000010, 0x0000000000000010, 0x0000004004400410, 0x0000000000000000, 0x0000004004000010, 0x0010004004400400, 0x0010000000000000, 0x0010000000000010, 0x0010004004400410, 0x0000004004000000, 0x0000000000400410, 0x0000004004400410, 0x0010000000400400, 0x0010004004000010, 0x0000004004400400, 0x0010004004000000, 0x0000000000000000, 0x0000000000400400, 0x0010004004000010, 0x0010004004400400, 0x0010000000000000, 0x0000000000000010, 0x0000004004000000, 0x0010000000000010, 0x0000004004000010, 0x0000004004400400, 0x0010000000400410, 0x0000000000000000, 0x0010004004400400, 0x0010004004000000, 0x0000004004400410, 0x0000004004000010, 0x0000000000400400, 0x0010004004400410, 0x0000000000000010, 0x0010004004000010, 0x0000000000400410, 0x0000000000400400, 0x0010004004400410, 0x0000004004000000, 0x0010000000400400, 0x0010000000400410, 0x0010004004000000, 0x0010000000400400, 0x0000000000000000, 0x0000004004400410, 0x0010000000000010, 0x0000000000400410, 0x0010004004000010, 0x0010000000000000, 0x0000004004400400, ), ( 0x0800100040040080, 0x0000100000001000, 0x0800000000000080, 0x0800100040041080, 0x0000000000000000, 0x0000000040041000, 0x0800100000001080, 0x0800000040040080, 0x0000100040041000, 0x0800000000001080, 0x0000000000001000, 0x0800100000000080, 0x0800000000001080, 0x0800100040040080, 0x0000000040040000, 0x0000000000001000, 0x0800000040041080, 0x0000100040040000, 0x0000100000000000, 0x0800000000000080, 0x0000100040040000, 0x0800100000001080, 0x0000000040041000, 0x0000100000000000, 0x0800100000000080, 0x0000000000000000, 0x0800000040040080, 0x0000100040041000, 0x0000100000001000, 0x0800000040041080, 0x0800100040041080, 0x0000000040040000, 0x0800000040041080, 0x0800100000000080, 0x0000000040040000, 0x0800000000001080, 0x0000100040040000, 0x0000100000001000, 0x0800000000000080, 0x0000000040041000, 0x0800100000001080, 0x0000000000000000, 0x0000100000000000, 0x0800000040040080, 0x0000000000000000, 0x0800000040041080, 0x0000100040041000, 0x0000100000000000, 0x0000000000001000, 0x0800100040041080, 0x0800100040040080, 0x0000000040040000, 0x0800100040041080, 0x0800000000000080, 0x0000100000001000, 0x0800100040040080, 0x0800000040040080, 0x0000100040040000, 0x0000000040041000, 0x0800100000001080, 0x0800100000000080, 0x0000000000001000, 0x0800000000001080, 0x0000100040041000, ), ( 0x0000000000800800, 0x0000001000000000, 0x0040040000000000, 0x2040041000800800, 0x2000001000800800, 0x0040040000800800, 0x2040041000000000, 0x0000001000800800, 0x0000001000000000, 0x2000000000000000, 0x2000000000800800, 0x0040041000000000, 0x2040040000800800, 0x2000001000800800, 0x0040041000800800, 0x0000000000000000, 0x0040041000000000, 0x0000000000800800, 0x2000001000000000, 0x2040040000000000, 0x0040040000800800, 0x2040041000000000, 0x0000000000000000, 0x2000000000800800, 0x2000000000000000, 0x2040040000800800, 0x2040041000800800, 0x2000001000000000, 0x0000001000800800, 0x0040040000000000, 0x2040040000000000, 0x0040041000800800, 0x0040041000800800, 0x2040040000800800, 0x2000001000000000, 0x0000001000800800, 0x0000001000000000, 0x2000000000000000, 0x2000000000800800, 0x0040040000800800, 0x0000000000800800, 0x0040041000000000, 0x2040041000800800, 0x0000000000000000, 0x2040041000000000, 0x0000000000800800, 0x0040040000000000, 0x2000001000000000, 0x2040040000800800, 0x0040040000000000, 0x0000000000000000, 0x2040041000800800, 0x2000001000800800, 0x0040041000800800, 0x2040040000000000, 0x0000001000000000, 0x0040041000000000, 0x2000001000800800, 0x0040040000800800, 0x2040040000000000, 0x2000000000000000, 0x2040041000000000, 0x0000001000800800, 0x2000000000800800, ), ( 0x4004000000008008, 0x4004000020000000, 0x0000000000000000, 0x0000200020008008, 0x4004000020000000, 0x0000200000000000, 0x4004200000008008, 0x0000000020000000, 0x4004200000000000, 0x4004200020008008, 0x0000200020000000, 0x0000000000008008, 0x0000200000008008, 0x4004000000008008, 0x0000000020008008, 0x4004200020000000, 0x0000000020000000, 0x4004200000008008, 0x4004000020008008, 0x0000000000000000, 0x0000200000000000, 0x4004000000000000, 0x0000200020008008, 0x4004000020008008, 0x4004200020008008, 0x0000000020008008, 0x0000000000008008, 0x4004200000000000, 0x4004000000000000, 0x0000200020000000, 0x4004200020000000, 0x0000200000008008, 0x4004200000000000, 0x0000000000008008, 0x0000200000008008, 0x4004200020000000, 0x0000200020008008, 0x4004000020000000, 0x0000000000000000, 0x0000200000008008, 0x0000000000008008, 0x0000200000000000, 0x4004000020008008, 0x0000000020000000, 0x4004000020000000, 0x4004200020008008, 0x0000200020000000, 0x4004000000000000, 0x4004200020008008, 0x0000200020000000, 0x0000000020000000, 0x4004200000008008, 0x4004000000008008, 0x0000000020008008, 0x4004200020000000, 0x0000000000000000, 0x0000200000000000, 0x4004000000008008, 0x4004200000008008, 0x0000200020008008, 0x0000000020008008, 0x4004200000000000, 0x4004000000000000, 0x4004000020008008, ), ( 0x0000400400000000, 0x0020000000000000, 0x0020000000100000, 0x0400000000100040, 0x0420400400100040, 0x0400400400000040, 0x0020400400000000, 0x0000000000000000, 0x0000000000100000, 0x0420000000100040, 0x0420000000000040, 0x0000400400100000, 0x0400000000000040, 0x0020400400100000, 0x0000400400100000, 0x0420000000000040, 0x0420000000100040, 0x0000400400000000, 0x0400400400000040, 0x0420400400100040, 0x0000000000000000, 0x0020000000100000, 0x0400000000100040, 0x0020400400000000, 0x0400400400100040, 0x0420400400000040, 0x0020400400100000, 0x0400000000000040, 0x0420400400000040, 0x0400400400100040, 0x0020000000000000, 0x0000000000100000, 0x0420400400000040, 0x0000400400100000, 0x0400400400100040, 0x0420000000000040, 0x0000400400000000, 0x0020000000000000, 0x0000000000100000, 0x0400400400100040, 0x0420000000100040, 0x0420400400000040, 0x0020400400000000, 0x0000000000000000, 0x0020000000000000, 0x0400000000100040, 0x0400000000000040, 0x0020000000100000, 0x0000000000000000, 0x0420000000100040, 0x0020000000100000, 0x0020400400000000, 0x0420000000000040, 0x0000400400000000, 0x0420400400100040, 0x0000000000100000, 0x0020400400100000, 0x0400000000000040, 0x0400400400000040, 0x0420400400100040, 0x0400000000100040, 0x0020400400100000, 0x0000400400100000, 0x0400400400000040, ), ( 0x8008000080082000, 0x0000002080082000, 0x8008002000000000, 0x0000000000000000, 0x0000002000002000, 0x8008000080080000, 0x0000000080082000, 0x8008002080082000, 0x8008000000000000, 0x0000000000002000, 0x0000002080080000, 0x8008002000000000, 0x8008002080080000, 0x8008002000002000, 0x8008000000002000, 0x0000000080082000, 0x0000002000000000, 0x8008002080080000, 0x8008000080080000, 0x0000002000002000, 0x8008002080082000, 0x8008000000002000, 0x0000000000000000, 0x0000002080080000, 0x0000000000002000, 0x0000000080080000, 0x8008002000002000, 0x8008000080082000, 0x0000000080080000, 0x0000002000000000, 0x0000002080082000, 0x8008000000000000, 0x0000000080080000, 0x0000002000000000, 0x8008000000002000, 0x8008002080082000, 0x8008002000000000, 0x0000000000002000, 0x0000000000000000, 0x0000002080080000, 0x8008000080082000, 0x8008002000002000, 0x0000002000002000, 0x8008000080080000, 0x0000002080082000, 0x8008000000000000, 0x8008000080080000, 0x0000002000002000, 0x8008002080082000, 0x0000000080080000, 0x0000000080082000, 0x8008000000002000, 0x0000002080080000, 0x8008002000000000, 0x8008002000002000, 0x0000000080082000, 0x8008000000000000, 0x0000002080082000, 0x8008002080080000, 0x0000000000000000, 0x0000000000002000, 0x8008000080082000, 0x0000002000000000, 0x8008002080080000, ), ) #--------------------------------------------------------------- # compressed/interleaved => final permutation table # Compression, final permutation, bit reverse #--------------------------------------------------------------- # NOTE: this was reordered from original table to make perm6464 logic simpler CF6464=( ( 0x0000000000000000, 0x0000002000000000, 0x0000200000000000, 0x0000202000000000, 0x0020000000000000, 0x0020002000000000, 0x0020200000000000, 0x0020202000000000, 0x2000000000000000, 0x2000002000000000, 0x2000200000000000, 0x2000202000000000, 0x2020000000000000, 0x2020002000000000, 0x2020200000000000, 0x2020202000000000, ), ( 0x0000000000000000, 0x0000000200000000, 0x0000020000000000, 0x0000020200000000, 0x0002000000000000, 0x0002000200000000, 0x0002020000000000, 0x0002020200000000, 0x0200000000000000, 0x0200000200000000, 0x0200020000000000, 0x0200020200000000, 0x0202000000000000, 0x0202000200000000, 0x0202020000000000, 0x0202020200000000, ), ( 0x0000000000000000, 0x0000000000000020, 0x0000000000002000, 0x0000000000002020, 0x0000000000200000, 0x0000000000200020, 0x0000000000202000, 0x0000000000202020, 0x0000000020000000, 0x0000000020000020, 0x0000000020002000, 0x0000000020002020, 0x0000000020200000, 0x0000000020200020, 0x0000000020202000, 0x0000000020202020, ), ( 0x0000000000000000, 0x0000000000000002, 0x0000000000000200, 0x0000000000000202, 0x0000000000020000, 0x0000000000020002, 0x0000000000020200, 0x0000000000020202, 0x0000000002000000, 0x0000000002000002, 0x0000000002000200, 0x0000000002000202, 0x0000000002020000, 0x0000000002020002, 0x0000000002020200, 0x0000000002020202, ), ( 0x0000000000000000, 0x0000008000000000, 0x0000800000000000, 0x0000808000000000, 0x0080000000000000, 0x0080008000000000, 0x0080800000000000, 0x0080808000000000, 0x8000000000000000, 0x8000008000000000, 0x8000800000000000, 0x8000808000000000, 0x8080000000000000, 0x8080008000000000, 0x8080800000000000, 0x8080808000000000, ), ( 0x0000000000000000, 0x0000000800000000, 0x0000080000000000, 0x0000080800000000, 0x0008000000000000, 0x0008000800000000, 0x0008080000000000, 0x0008080800000000, 0x0800000000000000, 0x0800000800000000, 0x0800080000000000, 0x0800080800000000, 0x0808000000000000, 0x0808000800000000, 0x0808080000000000, 0x0808080800000000, ), ( 0x0000000000000000, 0x0000000000000080, 0x0000000000008000, 0x0000000000008080, 0x0000000000800000, 0x0000000000800080, 0x0000000000808000, 0x0000000000808080, 0x0000000080000000, 0x0000000080000080, 0x0000000080008000, 0x0000000080008080, 0x0000000080800000, 0x0000000080800080, 0x0000000080808000, 0x0000000080808080, ), ( 0x0000000000000000, 0x0000000000000008, 0x0000000000000800, 0x0000000000000808, 0x0000000000080000, 0x0000000000080008, 0x0000000000080800, 0x0000000000080808, 0x0000000008000000, 0x0000000008000008, 0x0000000008000800, 0x0000000008000808, 0x0000000008080000, 0x0000000008080008, 0x0000000008080800, 0x0000000008080808, ), ( 0x0000000000000000, 0x0000001000000000, 0x0000100000000000, 0x0000101000000000, 0x0010000000000000, 0x0010001000000000, 0x0010100000000000, 0x0010101000000000, 0x1000000000000000, 0x1000001000000000, 0x1000100000000000, 0x1000101000000000, 0x1010000000000000, 0x1010001000000000, 0x1010100000000000, 0x1010101000000000, ), ( 0x0000000000000000, 0x0000000100000000, 0x0000010000000000, 0x0000010100000000, 0x0001000000000000, 0x0001000100000000, 0x0001010000000000, 0x0001010100000000, 0x0100000000000000, 0x0100000100000000, 0x0100010000000000, 0x0100010100000000, 0x0101000000000000, 0x0101000100000000, 0x0101010000000000, 0x0101010100000000, ), ( 0x0000000000000000, 0x0000000000000010, 0x0000000000001000, 0x0000000000001010, 0x0000000000100000, 0x0000000000100010, 0x0000000000101000, 0x0000000000101010, 0x0000000010000000, 0x0000000010000010, 0x0000000010001000, 0x0000000010001010, 0x0000000010100000, 0x0000000010100010, 0x0000000010101000, 0x0000000010101010, ), ( 0x0000000000000000, 0x0000000000000001, 0x0000000000000100, 0x0000000000000101, 0x0000000000010000, 0x0000000000010001, 0x0000000000010100, 0x0000000000010101, 0x0000000001000000, 0x0000000001000001, 0x0000000001000100, 0x0000000001000101, 0x0000000001010000, 0x0000000001010001, 0x0000000001010100, 0x0000000001010101, ), ( 0x0000000000000000, 0x0000004000000000, 0x0000400000000000, 0x0000404000000000, 0x0040000000000000, 0x0040004000000000, 0x0040400000000000, 0x0040404000000000, 0x4000000000000000, 0x4000004000000000, 0x4000400000000000, 0x4000404000000000, 0x4040000000000000, 0x4040004000000000, 0x4040400000000000, 0x4040404000000000, ), ( 0x0000000000000000, 0x0000000400000000, 0x0000040000000000, 0x0000040400000000, 0x0004000000000000, 0x0004000400000000, 0x0004040000000000, 0x0004040400000000, 0x0400000000000000, 0x0400000400000000, 0x0400040000000000, 0x0400040400000000, 0x0404000000000000, 0x0404000400000000, 0x0404040000000000, 0x0404040400000000, ), ( 0x0000000000000000, 0x0000000000000040, 0x0000000000004000, 0x0000000000004040, 0x0000000000400000, 0x0000000000400040, 0x0000000000404000, 0x0000000000404040, 0x0000000040000000, 0x0000000040000040, 0x0000000040004000, 0x0000000040004040, 0x0000000040400000, 0x0000000040400040, 0x0000000040404000, 0x0000000040404040, ), ( 0x0000000000000000, 0x0000000000000004, 0x0000000000000400, 0x0000000000000404, 0x0000000000040000, 0x0000000000040004, 0x0000000000040400, 0x0000000000040404, 0x0000000004000000, 0x0000000004000004, 0x0000000004000400, 0x0000000004000404, 0x0000000004040000, 0x0000000004040004, 0x0000000004040400, 0x0000000004040404, ), ) #=================================================================== # eof _load_tables() #=================================================================== #============================================================================= # support #============================================================================= def _permute(c, p): """Returns the permutation of the given 32-bit or 64-bit code with the specified permutation table.""" # NOTE: only difference between 32 & 64 bit permutations # is that len(p)==8 for 32 bit, and len(p)==16 for 64 bit. out = 0 for r in p: out |= r[c&0xf] c >>= 4 return out #============================================================================= # packing & unpacking #============================================================================= # FIXME: more properly named _uint8_struct... _uint64_struct = struct.Struct(">Q") def _pack64(value): return _uint64_struct.pack(value) def _unpack64(value): return _uint64_struct.unpack(value)[0] def _pack56(value): return _uint64_struct.pack(value)[1:] def _unpack56(value): return _uint64_struct.unpack(b'\x00' + value)[0] #============================================================================= # 56->64 key manipulation #============================================================================= ##def expand_7bit(value): ## "expand 7-bit integer => 7-bits + 1 odd-parity bit" ## # parity calc adapted from 32-bit even parity alg found at ## # http://graphics.stanford.edu/~seander/bithacks.html#ParityParallel ## assert 0 <= value < 0x80, "value out of range" ## return (value<<1) | (0x9669 >> ((value ^ (value >> 4)) & 0xf)) & 1 _EXPAND_ITER = irange(49,-7,-7) def expand_des_key(key): """convert DES from 7 bytes to 8 bytes (by inserting empty parity bits)""" if isinstance(key, bytes): if len(key) != 7: raise ValueError("key must be 7 bytes in size") elif isinstance(key, int_types): if key < 0 or key > INT_56_MASK: raise ValueError("key must be 56-bit non-negative integer") return _unpack64(expand_des_key(_pack56(key))) else: raise exc.ExpectedTypeError(key, "bytes or int", "key") key = _unpack56(key) # NOTE: the following would insert correctly-valued parity bits in each key, # but the parity bit would just be ignored in des_encrypt_block(), # so not bothering to use it. # XXX: could make parity-restoring optionally available via flag ##return join_byte_values(expand_7bit((key >> shift) & 0x7f) ## for shift in _EXPAND_ITER) return join_byte_values(((key>>shift) & 0x7f)<<1 for shift in _EXPAND_ITER) def shrink_des_key(key): """convert DES key from 8 bytes to 7 bytes (by discarding the parity bits)""" if isinstance(key, bytes): if len(key) != 8: raise ValueError("key must be 8 bytes in size") return _pack56(shrink_des_key(_unpack64(key))) elif isinstance(key, int_types): if key < 0 or key > INT_64_MASK: raise ValueError("key must be 64-bit non-negative integer") else: raise exc.ExpectedTypeError(key, "bytes or int", "key") key >>= 1 result = 0 offset = 0 while offset < 56: result |= (key & 0x7f)<<offset key >>= 8 offset += 7 assert not (result & ~INT_64_MASK) return result #============================================================================= # des encryption #============================================================================= def des_encrypt_block(key, input, salt=0, rounds=1): """encrypt single block of data using DES, operates on 8-byte strings. :arg key: DES key as 7 byte string, or 8 byte string with parity bits (parity bit values are ignored). :arg input: plaintext block to encrypt, as 8 byte string. :arg salt: Optional 24-bit integer used to mutate the base DES algorithm in a manner specific to :class:`~passlib.hash.des_crypt` and its variants. The default value ``0`` provides the normal (unsalted) DES behavior. The salt functions as follows: if the ``i``'th bit of ``salt`` is set, bits ``i`` and ``i+24`` are swapped in the DES E-box output. :arg rounds: Optional number of rounds of to apply the DES key schedule. the default (``rounds=1``) provides the normal DES behavior, but :class:`~passlib.hash.des_crypt` and its variants use alternate rounds values. :raises TypeError: if any of the provided args are of the wrong type. :raises ValueError: if any of the input blocks are the wrong size, or the salt/rounds values are out of range. :returns: resulting 8-byte ciphertext block. """ # validate & unpack key if isinstance(key, bytes): if len(key) == 7: key = expand_des_key(key) elif len(key) != 8: raise ValueError("key must be 7 or 8 bytes") key = _unpack64(key) else: raise exc.ExpectedTypeError(key, "bytes", "key") # validate & unpack input if isinstance(input, bytes): if len(input) != 8: raise ValueError("input block must be 8 bytes") input = _unpack64(input) else: raise exc.ExpectedTypeError(input, "bytes", "input") # hand things off to other func result = des_encrypt_int_block(key, input, salt, rounds) # repack result return _pack64(result) def des_encrypt_int_block(key, input, salt=0, rounds=1): """encrypt single block of data using DES, operates on 64-bit integers. this function is essentially the same as :func:`des_encrypt_block`, except that it operates on integers, and will NOT automatically expand 56-bit keys if provided (since there's no way to detect them). :arg key: DES key as 64-bit integer (the parity bits are ignored). :arg input: input block as 64-bit integer :arg salt: optional 24-bit integer used to mutate the base DES algorithm. defaults to ``0`` (no mutation applied). :arg rounds: optional number of rounds of to apply the DES key schedule. defaults to ``1``. :raises TypeError: if any of the provided args are of the wrong type. :raises ValueError: if any of the input blocks are the wrong size, or the salt/rounds values are out of range. :returns: resulting ciphertext as 64-bit integer. """ #--------------------------------------------------------------- # input validation #--------------------------------------------------------------- # validate salt, rounds if rounds < 1: raise ValueError("rounds must be positive integer") if salt < 0 or salt > INT_24_MASK: raise ValueError("salt must be 24-bit non-negative integer") # validate & unpack key if not isinstance(key, int_types): raise exc.ExpectedTypeError(key, "int", "key") elif key < 0 or key > INT_64_MASK: raise ValueError("key must be 64-bit non-negative integer") # validate & unpack input if not isinstance(input, int_types): raise exc.ExpectedTypeError(input, "int", "input") elif input < 0 or input > INT_64_MASK: raise ValueError("input must be 64-bit non-negative integer") #--------------------------------------------------------------- # DES setup #--------------------------------------------------------------- # load tables if not already done global SPE, PCXROT, IE3264, CF6464 if PCXROT is None: _load_tables() # load SPE into local vars to speed things up and remove an array access call SPE0, SPE1, SPE2, SPE3, SPE4, SPE5, SPE6, SPE7 = SPE # NOTE: parity bits are ignored completely # (UTs do fuzz testing to ensure this) # generate key schedule # NOTE: generation was modified to output two elements at a time, # so that per-round loop could do two passes at once. def _iter_key_schedule(ks_odd): """given 64-bit key, iterates over the 8 (even,odd) key schedule pairs""" for p_even, p_odd in PCXROT: ks_even = _permute(ks_odd, p_even) ks_odd = _permute(ks_even, p_odd) yield ks_even & _KS_MASK, ks_odd & _KS_MASK ks_list = list(_iter_key_schedule(key)) # expand 24 bit salt -> 32 bit per des_crypt & bsdi_crypt salt = ( ((salt & 0x00003f) << 26) | ((salt & 0x000fc0) << 12) | ((salt & 0x03f000) >> 2) | ((salt & 0xfc0000) >> 16) ) # init L & R if input == 0: L = R = 0 else: L = ((input >> 31) & 0xaaaaaaaa) | (input & 0x55555555) L = _permute(L, IE3264) R = ((input >> 32) & 0xaaaaaaaa) | ((input >> 1) & 0x55555555) R = _permute(R, IE3264) #--------------------------------------------------------------- # main DES loop - run for specified number of rounds #--------------------------------------------------------------- while rounds: rounds -= 1 # run over each part of the schedule, 2 parts at a time for ks_even, ks_odd in ks_list: k = ((R>>32) ^ R) & salt # use the salt to flip specific bits B = (k<<32) ^ k ^ R ^ ks_even L ^= (SPE0[(B>>58)&0x3f] ^ SPE1[(B>>50)&0x3f] ^ SPE2[(B>>42)&0x3f] ^ SPE3[(B>>34)&0x3f] ^ SPE4[(B>>26)&0x3f] ^ SPE5[(B>>18)&0x3f] ^ SPE6[(B>>10)&0x3f] ^ SPE7[(B>>2)&0x3f]) k = ((L>>32) ^ L) & salt # use the salt to flip specific bits B = (k<<32) ^ k ^ L ^ ks_odd R ^= (SPE0[(B>>58)&0x3f] ^ SPE1[(B>>50)&0x3f] ^ SPE2[(B>>42)&0x3f] ^ SPE3[(B>>34)&0x3f] ^ SPE4[(B>>26)&0x3f] ^ SPE5[(B>>18)&0x3f] ^ SPE6[(B>>10)&0x3f] ^ SPE7[(B>>2)&0x3f]) # swap L and R L, R = R, L #--------------------------------------------------------------- # return final result #--------------------------------------------------------------- C = ( ((L>>3) & 0x0f0f0f0f00000000) | ((L<<33) & 0xf0f0f0f000000000) | ((R>>35) & 0x000000000f0f0f0f) | ((R<<1) & 0x00000000f0f0f0f0) ) return _permute(C, CF6464) #============================================================================= # eof #=============================================================================
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