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331 lines
14 KiB
C
331 lines
14 KiB
C
/*
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* DES encryption/decryption
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* Copyright (c) 2007 Reimar Doeffinger
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "des.h"
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#define T(a, b, c, d, e, f, g, h) 64-a,64-b,64-c,64-d,64-e,64-f,64-g,64-h
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static const uint8_t IP_shuffle[] = {
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T(58, 50, 42, 34, 26, 18, 10, 2),
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T(60, 52, 44, 36, 28, 20, 12, 4),
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T(62, 54, 46, 38, 30, 22, 14, 6),
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T(64, 56, 48, 40, 32, 24, 16, 8),
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T(57, 49, 41, 33, 25, 17, 9, 1),
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T(59, 51, 43, 35, 27, 19, 11, 3),
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T(61, 53, 45, 37, 29, 21, 13, 5),
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T(63, 55, 47, 39, 31, 23, 15, 7)
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};
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#undef T
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#define T(a, b, c, d) 32-a,32-b,32-c,32-d
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static const uint8_t P_shuffle[] = {
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T(16, 7, 20, 21),
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T(29, 12, 28, 17),
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T( 1, 15, 23, 26),
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T( 5, 18, 31, 10),
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T( 2, 8, 24, 14),
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T(32, 27, 3, 9),
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T(19, 13, 30, 6),
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T(22, 11, 4, 25)
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};
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#undef T
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#define T(a, b, c, d, e, f, g) 64-a,64-b,64-c,64-d,64-e,64-f,64-g
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static const uint8_t PC1_shuffle[] = {
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T(57, 49, 41, 33, 25, 17, 9),
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T( 1, 58, 50, 42, 34, 26, 18),
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T(10, 2, 59, 51, 43, 35, 27),
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T(19, 11, 3, 60, 52, 44, 36),
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T(63, 55, 47, 39, 31, 23, 15),
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T( 7, 62, 54, 46, 38, 30, 22),
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T(14, 6, 61, 53, 45, 37, 29),
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T(21, 13, 5, 28, 20, 12, 4)
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};
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#undef T
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#define T(a, b, c, d, e, f) 56-a,56-b,56-c,56-d,56-e,56-f
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static const uint8_t PC2_shuffle[] = {
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T(14, 17, 11, 24, 1, 5),
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T( 3, 28, 15, 6, 21, 10),
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T(23, 19, 12, 4, 26, 8),
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T(16, 7, 27, 20, 13, 2),
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T(41, 52, 31, 37, 47, 55),
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T(30, 40, 51, 45, 33, 48),
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T(44, 49, 39, 56, 34, 53),
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T(46, 42, 50, 36, 29, 32)
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};
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#undef T
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#ifdef CONFIG_SMALL
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static const uint8_t S_boxes[8][32] = {
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{
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0x0e, 0xf4, 0x7d, 0x41, 0xe2, 0x2f, 0xdb, 0x18, 0xa3, 0x6a, 0xc6, 0xbc, 0x95, 0x59, 0x30, 0x87,
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0xf4, 0xc1, 0x8e, 0x28, 0x4d, 0x96, 0x12, 0x7b, 0x5f, 0xbc, 0x39, 0xe7, 0xa3, 0x0a, 0x65, 0xd0,
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}, {
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0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4, 0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a,
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0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21, 0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f,
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}, {
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0xda, 0x70, 0x09, 0x9e, 0x36, 0x43, 0x6f, 0xa5, 0x21, 0x8d, 0x5c, 0xe7, 0xcb, 0xb4, 0xf2, 0x18,
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0x1d, 0xa6, 0xd4, 0x09, 0x68, 0x9f, 0x83, 0x70, 0x4b, 0xf1, 0xe2, 0x3c, 0xb5, 0x5a, 0x2e, 0xc7,
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}, {
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0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a, 0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f,
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0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d, 0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4,
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}, {
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0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16, 0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69,
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0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8, 0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e,
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}, {
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0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58, 0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b,
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0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3, 0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6,
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}, {
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0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad, 0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61,
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0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e, 0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2,
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}, {
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0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41, 0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27,
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0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2, 0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8,
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}
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};
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#else
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/**
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* This table contains the results of applying both the S-box and P-shuffle.
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* It can be regenerated by compiling this file with -DCONFIG_SMALL -DTEST -DGENTABLES
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*/
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static const uint32_t S_boxes_P_shuffle[8][64] = {
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{
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0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000,
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0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002,
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0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202,
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0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000,
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0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200,
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0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202,
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0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200,
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0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002,
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},
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{
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0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010,
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0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010,
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0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000,
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0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010,
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0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000,
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0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000,
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0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010,
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0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000,
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},
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{
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0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100,
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0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104,
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0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104,
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0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000,
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0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000,
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0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004,
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0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004,
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0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100,
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},
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{
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0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000,
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0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000,
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0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040,
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0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040,
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0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000,
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0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040,
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0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040,
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0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040,
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},
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{
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0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000,
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0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000,
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0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080,
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0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080,
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0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080,
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0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000,
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0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000,
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0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080,
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},
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{
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0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000,
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0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008,
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0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008,
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0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000,
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0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008,
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0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000,
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0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008,
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0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008,
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},
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{
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0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400,
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0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401,
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0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001,
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0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400,
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0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001,
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0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400,
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0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401,
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0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001,
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},
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{
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0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000,
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0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020,
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0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800,
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0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000,
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0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820,
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0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820,
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0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000,
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0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800,
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},
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};
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#endif
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static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len) {
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int i;
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uint64_t res = 0;
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for (i = 0; i < shuffle_len; i++)
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res += res + ((in >> *shuffle++) & 1);
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return res;
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}
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static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len) {
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int i;
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uint64_t res = 0;
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shuffle += shuffle_len - 1;
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for (i = 0; i < shuffle_len; i++) {
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res |= (in & 1) << *shuffle--;
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in >>= 1;
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}
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return res;
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}
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static uint32_t f_func(uint32_t r, uint64_t k) {
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int i;
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uint32_t out = 0;
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// rotate to get first part of E-shuffle in the lowest 6 bits
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r = (r << 1) | (r >> 31);
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// apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits
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for (i = 7; i >= 0; i--) {
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uint8_t tmp = (r ^ k) & 0x3f;
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#ifdef CONFIG_SMALL
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uint8_t v = S_boxes[i][tmp >> 1];
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if (tmp & 1) v >>= 4;
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out = (out >> 4) | (v << 28);
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#else
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out |= S_boxes_P_shuffle[i][tmp];
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#endif
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// get next 6 bits of E-shuffle and round key k into the lowest bits
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r = (r >> 4) | (r << 28);
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k >>= 6;
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}
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#ifdef CONFIG_SMALL
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out = shuffle(out, P_shuffle, sizeof(P_shuffle));
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#endif
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return out;
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}
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/**
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* \brief rotate the two halves of the expanded 56 bit key each 1 bit left
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*
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* Note: the specification calls this "shift", so I kept it although
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* it is confusing.
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*/
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static uint64_t key_shift_left(uint64_t CDn) {
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uint64_t carries = (CDn >> 27) & 0x10000001;
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CDn <<= 1;
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CDn &= ~0x10000001;
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CDn |= carries;
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return CDn;
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}
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uint64_t ff_des_encdec(uint64_t in, uint64_t key, int decrypt) {
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int i;
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uint64_t K[16];
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// discard parity bits from key and shuffle it into C and D parts
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uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle));
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// generate round keys
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for (i = 0; i < 16; i++) {
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CDn = key_shift_left(CDn);
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if (i > 1 && i != 8 && i != 15)
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CDn = key_shift_left(CDn);
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K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle));
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}
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// used to apply round keys in reverse order for decryption
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decrypt = decrypt ? 15 : 0;
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// shuffle irrelevant to security but to ease hardware implementations
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in = shuffle(in, IP_shuffle, sizeof(IP_shuffle));
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for (i = 0; i < 16; i++) {
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uint32_t f_res;
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f_res = f_func(in, K[decrypt ^ i]);
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in = (in << 32) | (in >> 32);
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in ^= f_res;
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}
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in = (in << 32) | (in >> 32);
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// reverse shuffle used to ease hardware implementations
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in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle));
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return in;
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}
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#ifdef TEST
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/time.h>
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static uint64_t rand64(void) {
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uint64_t r = rand();
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r = (r << 32) | rand();
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return r;
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}
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int main(void) {
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int i, j;
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struct timeval tv;
|
|
uint64_t key;
|
|
uint64_t data;
|
|
uint64_t ct;
|
|
gettimeofday(&tv, NULL);
|
|
srand(tv.tv_sec * 1000 * 1000 + tv.tv_usec);
|
|
key = 0x123456789abcdef0ULL;
|
|
data = 0xfedcba9876543210ULL;
|
|
if (ff_des_encdec(data, key, 0) != 0x4ab65b3d4b061518ULL) {
|
|
printf("Test 1 failed\n");
|
|
return 1;
|
|
}
|
|
for (i = 0; i < 1000000; i++) {
|
|
key = rand64();
|
|
data = rand64();
|
|
ct = ff_des_encdec(data, key, 0);
|
|
if (ff_des_encdec(ct, key, 1) != data) {
|
|
printf("Test 2 failed\n");
|
|
return 1;
|
|
}
|
|
}
|
|
#ifdef GENTABLES
|
|
printf("static const uint32_t S_boxes_P_shuffle[8][64] = {\n");
|
|
for (i = 0; i < 8; i++) {
|
|
printf(" {");
|
|
for (j = 0; j < 64; j++) {
|
|
uint32_t v = S_boxes[i][j >> 1];
|
|
v = j & 1 ? v >> 4 : v & 0xf;
|
|
v <<= 28 - 4 * i;
|
|
v = shuffle(v, P_shuffle, sizeof(P_shuffle));
|
|
printf((j & 7) == 0 ? "\n " : " ");
|
|
printf("0x%08X,", v);
|
|
}
|
|
printf("\n },\n");
|
|
}
|
|
printf("};\n");
|
|
#endif
|
|
return 0;
|
|
}
|
|
#endif
|