mirror of
https://github.com/cryb-to/cryb-to.git
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470 lines
16 KiB
C
470 lines
16 KiB
C
/*-
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* Copyright (c) 2006-2007 Christophe Devine
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* Copyright (c) 2017 Dag-Erling Smørgrav
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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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* 1. 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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* 2. 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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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <cryb/assert.h>
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#include <cryb/bitwise.h>
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#include <cryb/endian.h>
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#include <cryb/memset_s.h>
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#include <cryb/des.h>
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/*
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* Expanded DES S-boxes
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*/
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static const uint32_t sb1[64] = {
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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 uint32_t sb2[64] = {
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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 uint32_t sb3[64] = {
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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 uint32_t sb4[64] = {
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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 uint32_t sb5[64] = {
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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 uint32_t sb6[64] = {
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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 uint32_t sb7[64] = {
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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 uint32_t sb8[64] = {
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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 uint32_t lhs[16] = {
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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 uint32_t rhs[16] = {
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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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do { \
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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 = rol32(y, 1) & 0xffffffff; \
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t = (x ^ y) & 0xaaaaaaaa; y ^= t; x ^= t; \
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x = rol32(x, 1) & 0xffffffff; \
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} while (0)
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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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do { \
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x = ror32(x, 1) & 0xffffffff; \
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t = (x ^ y) & 0xaaaaaaaa; x ^= t; y ^= t; \
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y = ror32(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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} while (0)
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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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do { \
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t = *sk++ ^ x; \
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y ^= \
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sb8[t >> 0 & 0x3f] ^ \
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sb6[t >> 8 & 0x3f] ^ \
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sb4[t >> 16 & 0x3f] ^ \
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sb2[t >> 24 & 0x3f]; \
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t = *sk++ ^ ror32(x, 4); \
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y ^= \
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sb7[t >> 0 & 0x3f] ^ \
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sb5[t >> 8 & 0x3f] ^ \
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sb3[t >> 16 & 0x3f] ^ \
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sb1[t >> 24 & 0x3f]; \
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} while (0)
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#define SWAP(a, b) \
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do { \
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(a) ^= (b); (b) ^= (a); (a) ^= (b); \
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} while (0)
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static void
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des_setkey(cipher_mode mode, uint32_t sk[32], const uint8_t key[8])
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{
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uint32_t x, y, t;
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unsigned int i;
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x = be32dec(key + 0);
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y = be32dec(key + 4);
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/* permuted choice 1 */
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t = (y >> 4 ^ x) & 0x0f0f0f0f; x ^= t; y ^= t << 4;
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t = (y >> 0 ^ x) & 0x10101010; x ^= t; y ^= t << 0;
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x = lhs[x >> 0 & 0xf] << 3 | lhs[x >> 8 & 0xf] << 2 |
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lhs[x >> 16 & 0xf] << 1 | lhs[x >> 24 & 0xf] << 0 |
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lhs[x >> 5 & 0xf] << 7 | lhs[x >> 13 & 0xf] << 6 |
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lhs[x >> 21 & 0xf] << 5 | lhs[x >> 29 & 0xf] << 4;
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y = rhs[y >> 1 & 0xf] << 3 | rhs[y >> 9 & 0xf] << 2 |
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rhs[y >> 17 & 0xf] << 1 | rhs[y >> 25 & 0xf] << 0 |
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rhs[y >> 4 & 0xf] << 7 | rhs[y >> 12 & 0xf] << 6 |
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rhs[y >> 20 & 0xf] << 5 | rhs[y >> 28 & 0xf] << 4;
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x &= 0x0FFFFFFF;
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y &= 0x0FFFFFFF;
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/* calculate subkeys */
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for (i = 0; i < 16; i++) {
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if (i < 2 || i == 8 || i == 15) {
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x = (x << 1 | x >> 27) & 0x0FFFFFFF;
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y = (y << 1 | y >> 27) & 0x0FFFFFFF;
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} else {
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x = (x << 2 | x >> 26) & 0x0FFFFFFF;
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y = (y << 2 | y >> 26) & 0x0FFFFFFF;
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}
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sk[i * 2] =
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(x << 4 & 0x24000000) | (x << 28 & 0x10000000) |
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(x << 14 & 0x08000000) | (x << 18 & 0x02080000) |
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(x << 6 & 0x01000000) | (x << 9 & 0x00200000) |
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(x >> 1 & 0x00100000) | (x << 10 & 0x00040000) |
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(x << 2 & 0x00020000) | (x >> 10 & 0x00010000) |
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(y >> 13 & 0x00002000) | (y >> 4 & 0x00001000) |
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(y << 6 & 0x00000800) | (y >> 1 & 0x00000400) |
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(y >> 14 & 0x00000200) | (y >> 0 & 0x00000100) |
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(y >> 5 & 0x00000020) | (y >> 10 & 0x00000010) |
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(y >> 3 & 0x00000008) | (y >> 18 & 0x00000004) |
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(y >> 26 & 0x00000002) | (y >> 24 & 0x00000001);
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sk[i * 2 + 1] =
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(x << 15 & 0x20000000) | (x << 17 & 0x10000000) |
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(x << 10 & 0x08000000) | (x << 22 & 0x04000000) |
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(x >> 2 & 0x02000000) | (x << 1 & 0x01000000) |
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(x << 16 & 0x00200000) | (x << 11 & 0x00100000) |
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(x << 3 & 0x00080000) | (x >> 6 & 0x00040000) |
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(x << 15 & 0x00020000) | (x >> 4 & 0x00010000) |
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(y >> 2 & 0x00002000) | (y << 8 & 0x00001000) |
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(y >> 14 & 0x00000808) | (y >> 9 & 0x00000400) |
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(y >> 0 & 0x00000200) | (y << 7 & 0x00000100) |
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(y >> 7 & 0x00000020) | (y >> 3 & 0x00000011) |
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(y << 2 & 0x00000004) | (y >> 21 & 0x00000002);
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}
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if (mode == CIPHER_MODE_DECRYPT) {
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for (i = 0; i < 16; i += 2) {
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SWAP(sk[i + 0], sk[30 - i]);
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SWAP(sk[i + 1], sk[31 - i]);
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}
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}
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}
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/*
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* DES-ECB block encryption / decryption
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*/
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static void
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des_crypt_ecb(des_ctx *ctx, const uint8_t input[8], uint8_t output[8])
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{
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uint32_t x, y, t, *sk;
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unsigned int i;
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x = be32dec(input + 0);
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y = be32dec(input + 4);
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sk = ctx->sk1;
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DES_IP(x, y);
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for (i = 0; i < 8; ++i) {
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DES_ROUND(y, x);
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DES_ROUND(x, y);
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}
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DES_FP(y, x);
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SWAP(x, y);
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sk = ctx->sk2;
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DES_IP(x, y);
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for (i = 0; i < 8; ++i) {
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DES_ROUND(y, x);
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DES_ROUND(x, y);
|
|
}
|
|
DES_FP(y, x);
|
|
SWAP(x, y);
|
|
sk = ctx->sk3;
|
|
DES_IP(x, y);
|
|
for (i = 0; i < 8; ++i) {
|
|
DES_ROUND(y, x);
|
|
DES_ROUND(x, y);
|
|
}
|
|
DES_FP(y, x);
|
|
be32enc(output + 0, y);
|
|
be32enc(output + 4, x);
|
|
}
|
|
|
|
void
|
|
des_init(des_ctx *ctx, cipher_mode mode, const uint8_t *key, size_t keylen)
|
|
{
|
|
cipher_mode m1, m2, m3;
|
|
|
|
assert(mode == CIPHER_MODE_ENCRYPT || mode == CIPHER_MODE_DECRYPT);
|
|
assert(keylen == 8 || keylen == 16 || keylen == 24);
|
|
if (mode == CIPHER_MODE_DECRYPT) {
|
|
m1 = m3 = CIPHER_MODE_DECRYPT;
|
|
m2 = CIPHER_MODE_ENCRYPT;
|
|
} else {
|
|
m1 = m3 = CIPHER_MODE_ENCRYPT;
|
|
m2 = CIPHER_MODE_DECRYPT;
|
|
}
|
|
des_setkey(m1, ctx->sk1, key);
|
|
switch (keylen) {
|
|
case 24:
|
|
des_setkey(m2, ctx->sk2, key + 8);
|
|
des_setkey(m3, ctx->sk3, key + 16);
|
|
break;
|
|
case 16:
|
|
des_setkey(m2, ctx->sk2, key + 8);
|
|
des_setkey(m3, ctx->sk3, key);
|
|
break;
|
|
case 8:
|
|
des_setkey(m2, ctx->sk2, key);
|
|
des_setkey(m3, ctx->sk3, key);
|
|
break;
|
|
}
|
|
}
|
|
|
|
size_t
|
|
des_encrypt(des_ctx *ctx, const void *vpt, uint8_t *ct, size_t len)
|
|
{
|
|
const uint8_t *pt = vpt;
|
|
unsigned int i;
|
|
|
|
len -= len % DES_BLOCK_LEN;
|
|
for (i = 0; i < len; i += DES_BLOCK_LEN) {
|
|
des_crypt_ecb(ctx, pt, ct);
|
|
pt += DES_BLOCK_LEN;
|
|
ct += DES_BLOCK_LEN;
|
|
}
|
|
return (len);
|
|
}
|
|
|
|
size_t
|
|
des_decrypt(des_ctx *ctx, const uint8_t *ct, void *vpt, size_t len)
|
|
{
|
|
uint8_t *pt = vpt;
|
|
unsigned int i;
|
|
|
|
len -= len % DES_BLOCK_LEN;
|
|
for (i = 0; i < len; i += DES_BLOCK_LEN) {
|
|
des_crypt_ecb(ctx, ct, pt);
|
|
ct += DES_BLOCK_LEN;
|
|
pt += DES_BLOCK_LEN;
|
|
}
|
|
return (len);
|
|
}
|
|
|
|
void
|
|
des_finish(des_ctx *ctx)
|
|
{
|
|
|
|
memset_s(ctx, 0, sizeof *ctx, sizeof *ctx);
|
|
}
|
|
|
|
cipher_algorithm des56_cipher = {
|
|
.name = "des",
|
|
.contextlen = sizeof(des_ctx),
|
|
.blocklen = DES_BLOCK_LEN,
|
|
.keylen = DES_BLOCK_LEN,
|
|
.init = (cipher_init_func)(void *)des_init,
|
|
.encrypt = (cipher_encrypt_func)(void *)des_encrypt,
|
|
.decrypt = (cipher_decrypt_func)(void *)des_decrypt,
|
|
.finish = (cipher_finish_func)(void *)des_finish,
|
|
};
|
|
|
|
cipher_algorithm des112_cipher = {
|
|
.name = "2des",
|
|
.contextlen = sizeof(des_ctx),
|
|
.blocklen = DES_BLOCK_LEN,
|
|
.keylen = DES_BLOCK_LEN * 2,
|
|
.init = (cipher_init_func)(void *)des_init,
|
|
.encrypt = (cipher_encrypt_func)(void *)des_encrypt,
|
|
.decrypt = (cipher_decrypt_func)(void *)des_decrypt,
|
|
.finish = (cipher_finish_func)(void *)des_finish,
|
|
};
|
|
|
|
cipher_algorithm des168_cipher = {
|
|
.name = "3des",
|
|
.contextlen = sizeof(des_ctx),
|
|
.blocklen = DES_BLOCK_LEN,
|
|
.keylen = DES_BLOCK_LEN * 3,
|
|
.init = (cipher_init_func)(void *)des_init,
|
|
.encrypt = (cipher_encrypt_func)(void *)des_encrypt,
|
|
.decrypt = (cipher_decrypt_func)(void *)des_decrypt,
|
|
.finish = (cipher_finish_func)(void *)des_finish,
|
|
};
|