| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * DES encryption/decryption | ||
| 3 | * Copyright (c) 2007 Reimar Doeffinger | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "config.h" | ||
| 23 | |||
| 24 | #include <stdint.h> | ||
| 25 | |||
| 26 | #include "attributes.h" | ||
| 27 | #include "error.h" | ||
| 28 | #include "intreadwrite.h" | ||
| 29 | #include "mem.h" | ||
| 30 | #include "des.h" | ||
| 31 | |||
| 32 | #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 | ||
| 33 | static const uint8_t IP_shuffle[] = { | ||
| 34 | T(58, 50, 42, 34, 26, 18, 10, 2), | ||
| 35 | T(60, 52, 44, 36, 28, 20, 12, 4), | ||
| 36 | T(62, 54, 46, 38, 30, 22, 14, 6), | ||
| 37 | T(64, 56, 48, 40, 32, 24, 16, 8), | ||
| 38 | T(57, 49, 41, 33, 25, 17, 9, 1), | ||
| 39 | T(59, 51, 43, 35, 27, 19, 11, 3), | ||
| 40 | T(61, 53, 45, 37, 29, 21, 13, 5), | ||
| 41 | T(63, 55, 47, 39, 31, 23, 15, 7) | ||
| 42 | }; | ||
| 43 | #undef T | ||
| 44 | |||
| 45 | #if CONFIG_SMALL || defined(GENTABLES) | ||
| 46 | #define T(a, b, c, d) 32 - a, 32 - b, 32 - c, 32 - d | ||
| 47 | static const uint8_t P_shuffle[] = { | ||
| 48 | T(16, 7, 20, 21), | ||
| 49 | T(29, 12, 28, 17), | ||
| 50 | T( 1, 15, 23, 26), | ||
| 51 | T( 5, 18, 31, 10), | ||
| 52 | T( 2, 8, 24, 14), | ||
| 53 | T(32, 27, 3, 9), | ||
| 54 | T(19, 13, 30, 6), | ||
| 55 | T(22, 11, 4, 25) | ||
| 56 | }; | ||
| 57 | #undef T | ||
| 58 | #endif | ||
| 59 | |||
| 60 | #define T(a, b, c, d, e, f, g) 64 - a, 64 - b, 64 - c, 64 - d, 64 - e, 64 - f, 64 - g | ||
| 61 | static const uint8_t PC1_shuffle[] = { | ||
| 62 | T(57, 49, 41, 33, 25, 17, 9), | ||
| 63 | T( 1, 58, 50, 42, 34, 26, 18), | ||
| 64 | T(10, 2, 59, 51, 43, 35, 27), | ||
| 65 | T(19, 11, 3, 60, 52, 44, 36), | ||
| 66 | T(63, 55, 47, 39, 31, 23, 15), | ||
| 67 | T( 7, 62, 54, 46, 38, 30, 22), | ||
| 68 | T(14, 6, 61, 53, 45, 37, 29), | ||
| 69 | T(21, 13, 5, 28, 20, 12, 4) | ||
| 70 | }; | ||
| 71 | #undef T | ||
| 72 | |||
| 73 | #define T(a, b, c, d, e, f) 56 - a, 56 - b, 56 - c, 56 - d, 56 - e, 56 - f | ||
| 74 | static const uint8_t PC2_shuffle[] = { | ||
| 75 | T(14, 17, 11, 24, 1, 5), | ||
| 76 | T( 3, 28, 15, 6, 21, 10), | ||
| 77 | T(23, 19, 12, 4, 26, 8), | ||
| 78 | T(16, 7, 27, 20, 13, 2), | ||
| 79 | T(41, 52, 31, 37, 47, 55), | ||
| 80 | T(30, 40, 51, 45, 33, 48), | ||
| 81 | T(44, 49, 39, 56, 34, 53), | ||
| 82 | T(46, 42, 50, 36, 29, 32) | ||
| 83 | }; | ||
| 84 | #undef T | ||
| 85 | |||
| 86 | #if CONFIG_SMALL | ||
| 87 | static const uint8_t S_boxes[8][32] = { | ||
| 88 | { 0x0e, 0xf4, 0x7d, 0x41, 0xe2, 0x2f, 0xdb, 0x18, 0xa3, 0x6a, 0xc6, 0xbc, 0x95, 0x59, 0x30, 0x87, | ||
| 89 | 0xf4, 0xc1, 0x8e, 0x28, 0x4d, 0x96, 0x12, 0x7b, 0x5f, 0xbc, 0x39, 0xe7, 0xa3, 0x0a, 0x65, 0xd0, }, | ||
| 90 | { 0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4, 0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a, | ||
| 91 | 0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21, 0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f, }, | ||
| 92 | { 0xda, 0x70, 0x09, 0x9e, 0x36, 0x43, 0x6f, 0xa5, 0x21, 0x8d, 0x5c, 0xe7, 0xcb, 0xb4, 0xf2, 0x18, | ||
| 93 | 0x1d, 0xa6, 0xd4, 0x09, 0x68, 0x9f, 0x83, 0x70, 0x4b, 0xf1, 0xe2, 0x3c, 0xb5, 0x5a, 0x2e, 0xc7, }, | ||
| 94 | { 0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a, 0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f, | ||
| 95 | 0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d, 0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4, }, | ||
| 96 | { 0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16, 0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69, | ||
| 97 | 0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8, 0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e, }, | ||
| 98 | { 0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58, 0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b, | ||
| 99 | 0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3, 0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6, }, | ||
| 100 | { 0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad, 0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61, | ||
| 101 | 0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e, 0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2, }, | ||
| 102 | { 0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41, 0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27, | ||
| 103 | 0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2, 0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8, | ||
| 104 | } | ||
| 105 | }; | ||
| 106 | #else | ||
| 107 | /** | ||
| 108 | * This table contains the results of applying both the S-box and P-shuffle. | ||
| 109 | * It can be regenerated by compiling tests/des.c with "-DCONFIG_SMALL -DGENTABLES". | ||
| 110 | */ | ||
| 111 | static const uint32_t S_boxes_P_shuffle[8][64] = { | ||
| 112 | { 0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000, | ||
| 113 | 0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002, | ||
| 114 | 0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202, | ||
| 115 | 0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000, | ||
| 116 | 0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200, | ||
| 117 | 0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202, | ||
| 118 | 0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200, | ||
| 119 | 0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002, }, | ||
| 120 | { 0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010, | ||
| 121 | 0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010, | ||
| 122 | 0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000, | ||
| 123 | 0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010, | ||
| 124 | 0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000, | ||
| 125 | 0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000, | ||
| 126 | 0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010, | ||
| 127 | 0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000, }, | ||
| 128 | { 0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100, | ||
| 129 | 0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104, | ||
| 130 | 0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104, | ||
| 131 | 0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000, | ||
| 132 | 0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000, | ||
| 133 | 0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004, | ||
| 134 | 0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004, | ||
| 135 | 0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100, }, | ||
| 136 | { 0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000, | ||
| 137 | 0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000, | ||
| 138 | 0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040, | ||
| 139 | 0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040, | ||
| 140 | 0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000, | ||
| 141 | 0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040, | ||
| 142 | 0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040, | ||
| 143 | 0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040, }, | ||
| 144 | { 0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000, | ||
| 145 | 0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000, | ||
| 146 | 0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080, | ||
| 147 | 0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080, | ||
| 148 | 0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080, | ||
| 149 | 0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000, | ||
| 150 | 0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000, | ||
| 151 | 0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080, }, | ||
| 152 | { 0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000, | ||
| 153 | 0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008, | ||
| 154 | 0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008, | ||
| 155 | 0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000, | ||
| 156 | 0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008, | ||
| 157 | 0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000, | ||
| 158 | 0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008, | ||
| 159 | 0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008, }, | ||
| 160 | { 0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400, | ||
| 161 | 0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401, | ||
| 162 | 0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001, | ||
| 163 | 0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400, | ||
| 164 | 0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001, | ||
| 165 | 0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400, | ||
| 166 | 0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401, | ||
| 167 | 0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001, }, | ||
| 168 | { 0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000, | ||
| 169 | 0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020, | ||
| 170 | 0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800, | ||
| 171 | 0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000, | ||
| 172 | 0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820, | ||
| 173 | 0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820, | ||
| 174 | 0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000, | ||
| 175 | 0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800, }, | ||
| 176 | }; | ||
| 177 | #endif | ||
| 178 | |||
| 179 | 238014 | static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len) | |
| 180 | { | ||
| 181 | int i; | ||
| 182 | 238014 | uint64_t res = 0; | |
| 183 |
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13739862 | for (i = 0; i < shuffle_len; i++) |
| 184 | 13501848 | res += res + ((in >> *shuffle++) & 1); | |
| 185 | 238014 | return res; | |
| 186 | } | ||
| 187 | |||
| 188 | 126545 | static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len) | |
| 189 | { | ||
| 190 | int i; | ||
| 191 | 126545 | uint64_t res = 0; | |
| 192 | 126545 | shuffle += shuffle_len - 1; | |
| 193 |
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8225425 | for (i = 0; i < shuffle_len; i++) { |
| 194 | 8098880 | res |= (in & 1) << *shuffle--; | |
| 195 | 8098880 | in >>= 1; | |
| 196 | } | ||
| 197 | 126545 | return res; | |
| 198 | } | ||
| 199 | |||
| 200 | 2024720 | static uint32_t f_func(uint32_t r, uint64_t k) | |
| 201 | { | ||
| 202 | int i; | ||
| 203 | 2024720 | uint32_t out = 0; | |
| 204 | // rotate to get first part of E-shuffle in the lowest 6 bits | ||
| 205 | 2024720 | r = (r << 1) | (r >> 31); | |
| 206 | // apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits | ||
| 207 |
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18222480 | for (i = 7; i >= 0; i--) { |
| 208 | 16197760 | uint8_t tmp = (r ^ k) & 0x3f; | |
| 209 | #if CONFIG_SMALL | ||
| 210 | uint8_t v = S_boxes[i][tmp >> 1]; | ||
| 211 | if (tmp & 1) | ||
| 212 | v >>= 4; | ||
| 213 | out = (out >> 4) | (v << 28); | ||
| 214 | #else | ||
| 215 | 16197760 | out |= S_boxes_P_shuffle[i][tmp]; | |
| 216 | #endif | ||
| 217 | // get next 6 bits of E-shuffle and round key k into the lowest bits | ||
| 218 | 16197760 | r = (r >> 4) | (r << 28); | |
| 219 | 16197760 | k >>= 6; | |
| 220 | } | ||
| 221 | #if CONFIG_SMALL | ||
| 222 | out = shuffle(out, P_shuffle, sizeof(P_shuffle)); | ||
| 223 | #endif | ||
| 224 | 2024720 | return out; | |
| 225 | } | ||
| 226 | |||
| 227 | /** | ||
| 228 | * @brief rotate the two halves of the expanded 56 bit key each 1 bit left | ||
| 229 | * | ||
| 230 | * Note: the specification calls this "shift", so I kept it although | ||
| 231 | * it is confusing. | ||
| 232 | */ | ||
| 233 | 183596 | static uint64_t key_shift_left(uint64_t CDn) | |
| 234 | { | ||
| 235 | 183596 | uint64_t carries = (CDn >> 27) & 0x10000001; | |
| 236 | 183596 | CDn <<= 1; | |
| 237 | 183596 | CDn &= ~0x10000001; | |
| 238 | 183596 | CDn |= carries; | |
| 239 | 183596 | return CDn; | |
| 240 | } | ||
| 241 | |||
| 242 | 6557 | static void gen_roundkeys(uint64_t K[16], uint64_t key) | |
| 243 | { | ||
| 244 | int i; | ||
| 245 | // discard parity bits from key and shuffle it into C and D parts | ||
| 246 | 6557 | uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle)); | |
| 247 | // generate round keys | ||
| 248 |
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111469 | for (i = 0; i < 16; i++) { |
| 249 | 104912 | CDn = key_shift_left(CDn); | |
| 250 |
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104912 | if (i > 1 && i != 8 && i != 15) |
| 251 | 78684 | CDn = key_shift_left(CDn); | |
| 252 | 104912 | K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle)); | |
| 253 | } | ||
| 254 | 6557 | } | |
| 255 | |||
| 256 | 126545 | static uint64_t des_encdec(uint64_t in, uint64_t K[16], int decrypt) | |
| 257 | { | ||
| 258 | int i; | ||
| 259 | // used to apply round keys in reverse order for decryption | ||
| 260 |
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126545 | decrypt = decrypt ? 15 : 0; |
| 261 | // shuffle irrelevant to security but to ease hardware implementations | ||
| 262 | 126545 | in = shuffle(in, IP_shuffle, sizeof(IP_shuffle)); | |
| 263 |
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2151265 | for (i = 0; i < 16; i++) { |
| 264 | uint32_t f_res; | ||
| 265 | 2024720 | f_res = f_func(in, K[decrypt ^ i]); | |
| 266 | 2024720 | in = (in << 32) | (in >> 32); | |
| 267 | 2024720 | in ^= f_res; | |
| 268 | } | ||
| 269 | 126545 | in = (in << 32) | (in >> 32); | |
| 270 | // reverse shuffle used to ease hardware implementations | ||
| 271 | 126545 | in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle)); | |
| 272 | 126545 | return in; | |
| 273 | } | ||
| 274 | |||
| 275 | 543 | AVDES *av_des_alloc(void) | |
| 276 | { | ||
| 277 | 543 | return av_mallocz(sizeof(struct AVDES)); | |
| 278 | } | ||
| 279 | |||
| 280 | 2548 | int av_des_init(AVDES *d, const uint8_t *key, int key_bits, av_unused int decrypt) { | |
| 281 |
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2548 | if (key_bits != 64 && key_bits != 192) |
| 282 | ✗ | return AVERROR(EINVAL); | |
| 283 | 2548 | d->triple_des = key_bits > 64; | |
| 284 | 2548 | gen_roundkeys(d->round_keys[0], AV_RB64(key)); | |
| 285 |
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2548 | if (d->triple_des) { |
| 286 | 2004 | gen_roundkeys(d->round_keys[1], AV_RB64(key + 8)); | |
| 287 | 2004 | gen_roundkeys(d->round_keys[2], AV_RB64(key + 16)); | |
| 288 | } | ||
| 289 | 2548 | return 0; | |
| 290 | } | ||
| 291 | |||
| 292 | 2548 | static void av_des_crypt_mac(AVDES *d, uint8_t *dst, const uint8_t *src, | |
| 293 | int count, uint8_t *iv, int decrypt, int mac) | ||
| 294 | { | ||
| 295 |
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2548 | uint64_t iv_val = iv ? AV_RB64(iv) : 0; |
| 296 |
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45092 | while (count-- > 0) { |
| 297 | uint64_t dst_val; | ||
| 298 |
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42544 | uint64_t src_val = src ? AV_RB64(src) : 0; |
| 299 |
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42544 | if (decrypt) { |
| 300 | 21543 | uint64_t tmp = src_val; | |
| 301 |
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21543 | if (d->triple_des) { |
| 302 | 21000 | src_val = des_encdec(src_val, d->round_keys[2], 1); | |
| 303 | 21000 | src_val = des_encdec(src_val, d->round_keys[1], 0); | |
| 304 | } | ||
| 305 | 21543 | dst_val = des_encdec(src_val, d->round_keys[0], 1) ^ iv_val; | |
| 306 |
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21543 | iv_val = iv ? tmp : 0; |
| 307 | } else { | ||
| 308 | 21001 | dst_val = des_encdec(src_val ^ iv_val, d->round_keys[0], 0); | |
| 309 |
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21001 | if (d->triple_des) { |
| 310 | 21000 | dst_val = des_encdec(dst_val, d->round_keys[1], 1); | |
| 311 | 21000 | dst_val = des_encdec(dst_val, d->round_keys[2], 0); | |
| 312 | } | ||
| 313 |
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21001 | iv_val = iv ? dst_val : 0; |
| 314 | } | ||
| 315 | 42544 | AV_WB64(dst, dst_val); | |
| 316 | 42544 | src += 8; | |
| 317 |
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42544 | if (!mac) |
| 318 | 42544 | dst += 8; | |
| 319 | } | ||
| 320 |
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2548 | if (iv) |
| 321 | 2 | AV_WB64(iv, iv_val); | |
| 322 | 2548 | } | |
| 323 | |||
| 324 | 2548 | void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, | |
| 325 | int count, uint8_t *iv, int decrypt) | ||
| 326 | { | ||
| 327 | 2548 | av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0); | |
| 328 | 2548 | } | |
| 329 | |||
| 330 | ✗ | void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count) | |
| 331 | { | ||
| 332 | ✗ | av_des_crypt_mac(d, dst, src, count, (uint8_t[8]) { 0 }, 0, 1); | |
| 333 | ✗ | } | |
| 334 |