423 lines
16 KiB
C
423 lines
16 KiB
C
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/*
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* FIPS-46-3 compliant Triple-DES implementation
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*
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* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
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*
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* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of PolarSSL or XySSL nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* DES, on which TDES is based, was originally designed by Horst Feistel
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* at IBM in 1974, and was adopted as a standard by NIST (formerly NBS).
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*
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* http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf
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*/
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#include "lwip/opt.h"
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#if PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES
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#include "netif/ppp/polarssl/des.h"
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_ULONG_BE
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#define GET_ULONG_BE(n,b,i) \
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{ \
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(n) = ( (unsigned long) (b)[(i) ] << 24 ) \
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| ( (unsigned long) (b)[(i) + 1] << 16 ) \
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| ( (unsigned long) (b)[(i) + 2] << 8 ) \
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| ( (unsigned long) (b)[(i) + 3] ); \
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}
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#endif
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#ifndef PUT_ULONG_BE
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#define PUT_ULONG_BE(n,b,i) \
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{ \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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}
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#endif
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/*
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* Expanded DES S-boxes
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*/
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static const unsigned long SB1[64] =
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{
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0x01010400, 0x00000000, 0x00010000, 0x01010404,
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0x01010004, 0x00010404, 0x00000004, 0x00010000,
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0x00000400, 0x01010400, 0x01010404, 0x00000400,
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0x01000404, 0x01010004, 0x01000000, 0x00000004,
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0x00000404, 0x01000400, 0x01000400, 0x00010400,
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0x00010400, 0x01010000, 0x01010000, 0x01000404,
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0x00010004, 0x01000004, 0x01000004, 0x00010004,
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0x00000000, 0x00000404, 0x00010404, 0x01000000,
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0x00010000, 0x01010404, 0x00000004, 0x01010000,
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0x01010400, 0x01000000, 0x01000000, 0x00000400,
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0x01010004, 0x00010000, 0x00010400, 0x01000004,
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0x00000400, 0x00000004, 0x01000404, 0x00010404,
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0x01010404, 0x00010004, 0x01010000, 0x01000404,
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0x01000004, 0x00000404, 0x00010404, 0x01010400,
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0x00000404, 0x01000400, 0x01000400, 0x00000000,
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0x00010004, 0x00010400, 0x00000000, 0x01010004
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};
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static const unsigned long SB2[64] =
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{
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0x80108020, 0x80008000, 0x00008000, 0x00108020,
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0x00100000, 0x00000020, 0x80100020, 0x80008020,
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0x80000020, 0x80108020, 0x80108000, 0x80000000,
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0x80008000, 0x00100000, 0x00000020, 0x80100020,
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0x00108000, 0x00100020, 0x80008020, 0x00000000,
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0x80000000, 0x00008000, 0x00108020, 0x80100000,
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0x00100020, 0x80000020, 0x00000000, 0x00108000,
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0x00008020, 0x80108000, 0x80100000, 0x00008020,
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0x00000000, 0x00108020, 0x80100020, 0x00100000,
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0x80008020, 0x80100000, 0x80108000, 0x00008000,
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0x80100000, 0x80008000, 0x00000020, 0x80108020,
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0x00108020, 0x00000020, 0x00008000, 0x80000000,
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0x00008020, 0x80108000, 0x00100000, 0x80000020,
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0x00100020, 0x80008020, 0x80000020, 0x00100020,
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0x00108000, 0x00000000, 0x80008000, 0x00008020,
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0x80000000, 0x80100020, 0x80108020, 0x00108000
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};
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static const unsigned long SB3[64] =
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{
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0x00000208, 0x08020200, 0x00000000, 0x08020008,
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0x08000200, 0x00000000, 0x00020208, 0x08000200,
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0x00020008, 0x08000008, 0x08000008, 0x00020000,
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0x08020208, 0x00020008, 0x08020000, 0x00000208,
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0x08000000, 0x00000008, 0x08020200, 0x00000200,
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0x00020200, 0x08020000, 0x08020008, 0x00020208,
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0x08000208, 0x00020200, 0x00020000, 0x08000208,
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0x00000008, 0x08020208, 0x00000200, 0x08000000,
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0x08020200, 0x08000000, 0x00020008, 0x00000208,
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0x00020000, 0x08020200, 0x08000200, 0x00000000,
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0x00000200, 0x00020008, 0x08020208, 0x08000200,
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0x08000008, 0x00000200, 0x00000000, 0x08020008,
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0x08000208, 0x00020000, 0x08000000, 0x08020208,
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0x00000008, 0x00020208, 0x00020200, 0x08000008,
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0x08020000, 0x08000208, 0x00000208, 0x08020000,
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0x00020208, 0x00000008, 0x08020008, 0x00020200
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};
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static const unsigned long SB4[64] =
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{
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802080, 0x00800081, 0x00800001, 0x00002001,
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0x00000000, 0x00802000, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00800080, 0x00800001,
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0x00000001, 0x00002000, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002001, 0x00002080,
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0x00800081, 0x00000001, 0x00002080, 0x00800080,
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0x00002000, 0x00802080, 0x00802081, 0x00000081,
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0x00800080, 0x00800001, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00000000, 0x00802000,
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0x00002080, 0x00800080, 0x00800081, 0x00000001,
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802081, 0x00000081, 0x00000001, 0x00002000,
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0x00800001, 0x00002001, 0x00802080, 0x00800081,
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0x00002001, 0x00002080, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002000, 0x00802080
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};
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static const unsigned long SB5[64] =
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{
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0x00000100, 0x02080100, 0x02080000, 0x42000100,
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0x00080000, 0x00000100, 0x40000000, 0x02080000,
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0x40080100, 0x00080000, 0x02000100, 0x40080100,
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0x42000100, 0x42080000, 0x00080100, 0x40000000,
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0x02000000, 0x40080000, 0x40080000, 0x00000000,
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0x40000100, 0x42080100, 0x42080100, 0x02000100,
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0x42080000, 0x40000100, 0x00000000, 0x42000000,
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0x02080100, 0x02000000, 0x42000000, 0x00080100,
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0x00080000, 0x42000100, 0x00000100, 0x02000000,
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0x40000000, 0x02080000, 0x42000100, 0x40080100,
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0x02000100, 0x40000000, 0x42080000, 0x02080100,
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0x40080100, 0x00000100, 0x02000000, 0x42080000,
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0x42080100, 0x00080100, 0x42000000, 0x42080100,
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0x02080000, 0x00000000, 0x40080000, 0x42000000,
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0x00080100, 0x02000100, 0x40000100, 0x00080000,
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0x00000000, 0x40080000, 0x02080100, 0x40000100
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};
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static const unsigned long SB6[64] =
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{
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0x20000010, 0x20400000, 0x00004000, 0x20404010,
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0x20400000, 0x00000010, 0x20404010, 0x00400000,
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0x20004000, 0x00404010, 0x00400000, 0x20000010,
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0x00400010, 0x20004000, 0x20000000, 0x00004010,
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0x00000000, 0x00400010, 0x20004010, 0x00004000,
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0x00404000, 0x20004010, 0x00000010, 0x20400010,
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0x20400010, 0x00000000, 0x00404010, 0x20404000,
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0x00004010, 0x00404000, 0x20404000, 0x20000000,
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0x20004000, 0x00000010, 0x20400010, 0x00404000,
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0x20404010, 0x00400000, 0x00004010, 0x20000010,
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0x00400000, 0x20004000, 0x20000000, 0x00004010,
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0x20000010, 0x20404010, 0x00404000, 0x20400000,
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0x00404010, 0x20404000, 0x00000000, 0x20400010,
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0x00000010, 0x00004000, 0x20400000, 0x00404010,
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0x00004000, 0x00400010, 0x20004010, 0x00000000,
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0x20404000, 0x20000000, 0x00400010, 0x20004010
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};
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static const unsigned long SB7[64] =
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{
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0x00200000, 0x04200002, 0x04000802, 0x00000000,
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0x00000800, 0x04000802, 0x00200802, 0x04200800,
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0x04200802, 0x00200000, 0x00000000, 0x04000002,
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0x00000002, 0x04000000, 0x04200002, 0x00000802,
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0x04000800, 0x00200802, 0x00200002, 0x04000800,
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0x04000002, 0x04200000, 0x04200800, 0x00200002,
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0x04200000, 0x00000800, 0x00000802, 0x04200802,
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0x00200800, 0x00000002, 0x04000000, 0x00200800,
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0x04000000, 0x00200800, 0x00200000, 0x04000802,
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0x04000802, 0x04200002, 0x04200002, 0x00000002,
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0x00200002, 0x04000000, 0x04000800, 0x00200000,
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0x04200800, 0x00000802, 0x00200802, 0x04200800,
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0x00000802, 0x04000002, 0x04200802, 0x04200000,
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0x00200800, 0x00000000, 0x00000002, 0x04200802,
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0x00000000, 0x00200802, 0x04200000, 0x00000800,
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0x04000002, 0x04000800, 0x00000800, 0x00200002
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};
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static const unsigned long SB8[64] =
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{
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0x10001040, 0x00001000, 0x00040000, 0x10041040,
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0x10000000, 0x10001040, 0x00000040, 0x10000000,
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0x00040040, 0x10040000, 0x10041040, 0x00041000,
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0x10041000, 0x00041040, 0x00001000, 0x00000040,
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0x10040000, 0x10000040, 0x10001000, 0x00001040,
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0x00041000, 0x00040040, 0x10040040, 0x10041000,
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0x00001040, 0x00000000, 0x00000000, 0x10040040,
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0x10000040, 0x10001000, 0x00041040, 0x00040000,
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0x00041040, 0x00040000, 0x10041000, 0x00001000,
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0x00000040, 0x10040040, 0x00001000, 0x00041040,
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0x10001000, 0x00000040, 0x10000040, 0x10040000,
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0x10040040, 0x10000000, 0x00040000, 0x10001040,
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0x00000000, 0x10041040, 0x00040040, 0x10000040,
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0x10040000, 0x10001000, 0x10001040, 0x00000000,
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0x10041040, 0x00041000, 0x00041000, 0x00001040,
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0x00001040, 0x00040040, 0x10000000, 0x10041000
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};
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/*
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* PC1: left and right halves bit-swap
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*/
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static const unsigned long LHs[16] =
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{
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0x00000000, 0x00000001, 0x00000100, 0x00000101,
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0x00010000, 0x00010001, 0x00010100, 0x00010101,
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0x01000000, 0x01000001, 0x01000100, 0x01000101,
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0x01010000, 0x01010001, 0x01010100, 0x01010101
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};
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static const unsigned long RHs[16] =
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{
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0x00000000, 0x01000000, 0x00010000, 0x01010000,
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0x00000100, 0x01000100, 0x00010100, 0x01010100,
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0x00000001, 0x01000001, 0x00010001, 0x01010001,
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0x00000101, 0x01000101, 0x00010101, 0x01010101,
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};
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/*
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* Initial Permutation macro
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*/
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#define DES_IP(X,Y) \
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{ \
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T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \
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T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \
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T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \
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T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \
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Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF; \
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T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T; \
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X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF; \
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}
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/*
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* Final Permutation macro
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*/
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#define DES_FP(X,Y) \
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{ \
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X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF; \
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T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T; \
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Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF; \
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T = ((Y >> 8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T << 8); \
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T = ((Y >> 2) ^ X) & 0x33333333; X ^= T; Y ^= (T << 2); \
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T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16); \
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T = ((X >> 4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T << 4); \
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}
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/*
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* DES round macro
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*/
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#define DES_ROUND(X,Y) \
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|
|
{ \
|
||
|
|
T = *SK++ ^ X; \
|
||
|
|
Y ^= SB8[ (T ) & 0x3F ] ^ \
|
||
|
|
SB6[ (T >> 8) & 0x3F ] ^ \
|
||
|
|
SB4[ (T >> 16) & 0x3F ] ^ \
|
||
|
|
SB2[ (T >> 24) & 0x3F ]; \
|
||
|
|
\
|
||
|
|
T = *SK++ ^ ((X << 28) | (X >> 4)); \
|
||
|
|
Y ^= SB7[ (T ) & 0x3F ] ^ \
|
||
|
|
SB5[ (T >> 8) & 0x3F ] ^ \
|
||
|
|
SB3[ (T >> 16) & 0x3F ] ^ \
|
||
|
|
SB1[ (T >> 24) & 0x3F ]; \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define SWAP(a,b) { unsigned long t = a; a = b; b = t; t = 0; }
|
||
|
|
|
||
|
|
static void des_setkey( unsigned long SK[32], unsigned char key[8] )
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
unsigned long X, Y, T;
|
||
|
|
|
||
|
|
GET_ULONG_BE( X, key, 0 );
|
||
|
|
GET_ULONG_BE( Y, key, 4 );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Permuted Choice 1
|
||
|
|
*/
|
||
|
|
T = ((Y >> 4) ^ X) & 0x0F0F0F0F; X ^= T; Y ^= (T << 4);
|
||
|
|
T = ((Y ) ^ X) & 0x10101010; X ^= T; Y ^= (T );
|
||
|
|
|
||
|
|
X = (LHs[ (X ) & 0xF] << 3) | (LHs[ (X >> 8) & 0xF ] << 2)
|
||
|
|
| (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ] )
|
||
|
|
| (LHs[ (X >> 5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6)
|
||
|
|
| (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4);
|
||
|
|
|
||
|
|
Y = (RHs[ (Y >> 1) & 0xF] << 3) | (RHs[ (Y >> 9) & 0xF ] << 2)
|
||
|
|
| (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ] )
|
||
|
|
| (RHs[ (Y >> 4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6)
|
||
|
|
| (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4);
|
||
|
|
|
||
|
|
X &= 0x0FFFFFFF;
|
||
|
|
Y &= 0x0FFFFFFF;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* calculate subkeys
|
||
|
|
*/
|
||
|
|
for( i = 0; i < 16; i++ )
|
||
|
|
{
|
||
|
|
if( i < 2 || i == 8 || i == 15 )
|
||
|
|
{
|
||
|
|
X = ((X << 1) | (X >> 27)) & 0x0FFFFFFF;
|
||
|
|
Y = ((Y << 1) | (Y >> 27)) & 0x0FFFFFFF;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
X = ((X << 2) | (X >> 26)) & 0x0FFFFFFF;
|
||
|
|
Y = ((Y << 2) | (Y >> 26)) & 0x0FFFFFFF;
|
||
|
|
}
|
||
|
|
|
||
|
|
*SK++ = ((X << 4) & 0x24000000) | ((X << 28) & 0x10000000)
|
||
|
|
| ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000)
|
||
|
|
| ((X << 6) & 0x01000000) | ((X << 9) & 0x00200000)
|
||
|
|
| ((X >> 1) & 0x00100000) | ((X << 10) & 0x00040000)
|
||
|
|
| ((X << 2) & 0x00020000) | ((X >> 10) & 0x00010000)
|
||
|
|
| ((Y >> 13) & 0x00002000) | ((Y >> 4) & 0x00001000)
|
||
|
|
| ((Y << 6) & 0x00000800) | ((Y >> 1) & 0x00000400)
|
||
|
|
| ((Y >> 14) & 0x00000200) | ((Y ) & 0x00000100)
|
||
|
|
| ((Y >> 5) & 0x00000020) | ((Y >> 10) & 0x00000010)
|
||
|
|
| ((Y >> 3) & 0x00000008) | ((Y >> 18) & 0x00000004)
|
||
|
|
| ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001);
|
||
|
|
|
||
|
|
*SK++ = ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000)
|
||
|
|
| ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000)
|
||
|
|
| ((X >> 2) & 0x02000000) | ((X << 1) & 0x01000000)
|
||
|
|
| ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000)
|
||
|
|
| ((X << 3) & 0x00080000) | ((X >> 6) & 0x00040000)
|
||
|
|
| ((X << 15) & 0x00020000) | ((X >> 4) & 0x00010000)
|
||
|
|
| ((Y >> 2) & 0x00002000) | ((Y << 8) & 0x00001000)
|
||
|
|
| ((Y >> 14) & 0x00000808) | ((Y >> 9) & 0x00000400)
|
||
|
|
| ((Y ) & 0x00000200) | ((Y << 7) & 0x00000100)
|
||
|
|
| ((Y >> 7) & 0x00000020) | ((Y >> 3) & 0x00000011)
|
||
|
|
| ((Y << 2) & 0x00000004) | ((Y >> 21) & 0x00000002);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* DES key schedule (56-bit, encryption)
|
||
|
|
*/
|
||
|
|
void des_setkey_enc( des_context *ctx, unsigned char key[8] )
|
||
|
|
{
|
||
|
|
des_setkey( ctx->sk, key );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* DES key schedule (56-bit, decryption)
|
||
|
|
*/
|
||
|
|
void des_setkey_dec( des_context *ctx, unsigned char key[8] )
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
des_setkey( ctx->sk, key );
|
||
|
|
|
||
|
|
for( i = 0; i < 16; i += 2 )
|
||
|
|
{
|
||
|
|
SWAP( ctx->sk[i ], ctx->sk[30 - i] );
|
||
|
|
SWAP( ctx->sk[i + 1], ctx->sk[31 - i] );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* DES-ECB block encryption/decryption
|
||
|
|
*/
|
||
|
|
void des_crypt_ecb( des_context *ctx,
|
||
|
|
const unsigned char input[8],
|
||
|
|
unsigned char output[8] )
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
unsigned long X, Y, T, *SK;
|
||
|
|
|
||
|
|
SK = ctx->sk;
|
||
|
|
|
||
|
|
GET_ULONG_BE( X, input, 0 );
|
||
|
|
GET_ULONG_BE( Y, input, 4 );
|
||
|
|
|
||
|
|
DES_IP( X, Y );
|
||
|
|
|
||
|
|
for( i = 0; i < 8; i++ )
|
||
|
|
{
|
||
|
|
DES_ROUND( Y, X );
|
||
|
|
DES_ROUND( X, Y );
|
||
|
|
}
|
||
|
|
|
||
|
|
DES_FP( Y, X );
|
||
|
|
|
||
|
|
PUT_ULONG_BE( Y, output, 0 );
|
||
|
|
PUT_ULONG_BE( X, output, 4 );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* PPP_SUPPORT && LWIP_INCLUDED_POLARSSL_DES */
|