| 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 | #include <inttypes.h> |
| 22 | #include "avutil.h" |
| 23 | #include "common.h" |
| 24 | #include "intreadwrite.h" |
| 25 | #include "des.h" |
| 26 | |
| 27 | typedef struct AVDES AVDES; |
| 28 | |
| 29 | #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 |
| 30 | static const uint8_t IP_shuffle[] = { |
| 31 | T(58, 50, 42, 34, 26, 18, 10, 2), |
| 32 | T(60, 52, 44, 36, 28, 20, 12, 4), |
| 33 | T(62, 54, 46, 38, 30, 22, 14, 6), |
| 34 | T(64, 56, 48, 40, 32, 24, 16, 8), |
| 35 | T(57, 49, 41, 33, 25, 17, 9, 1), |
| 36 | T(59, 51, 43, 35, 27, 19, 11, 3), |
| 37 | T(61, 53, 45, 37, 29, 21, 13, 5), |
| 38 | T(63, 55, 47, 39, 31, 23, 15, 7) |
| 39 | }; |
| 40 | #undef T |
| 41 | |
| 42 | #if CONFIG_SMALL || defined(GENTABLES) |
| 43 | #define T(a, b, c, d) 32-a,32-b,32-c,32-d |
| 44 | static const uint8_t P_shuffle[] = { |
| 45 | T(16, 7, 20, 21), |
| 46 | T(29, 12, 28, 17), |
| 47 | T( 1, 15, 23, 26), |
| 48 | T( 5, 18, 31, 10), |
| 49 | T( 2, 8, 24, 14), |
| 50 | T(32, 27, 3, 9), |
| 51 | T(19, 13, 30, 6), |
| 52 | T(22, 11, 4, 25) |
| 53 | }; |
| 54 | #undef T |
| 55 | #endif |
| 56 | |
| 57 | #define T(a, b, c, d, e, f, g) 64-a,64-b,64-c,64-d,64-e,64-f,64-g |
| 58 | static const uint8_t PC1_shuffle[] = { |
| 59 | T(57, 49, 41, 33, 25, 17, 9), |
| 60 | T( 1, 58, 50, 42, 34, 26, 18), |
| 61 | T(10, 2, 59, 51, 43, 35, 27), |
| 62 | T(19, 11, 3, 60, 52, 44, 36), |
| 63 | T(63, 55, 47, 39, 31, 23, 15), |
| 64 | T( 7, 62, 54, 46, 38, 30, 22), |
| 65 | T(14, 6, 61, 53, 45, 37, 29), |
| 66 | T(21, 13, 5, 28, 20, 12, 4) |
| 67 | }; |
| 68 | #undef T |
| 69 | |
| 70 | #define T(a, b, c, d, e, f) 56-a,56-b,56-c,56-d,56-e,56-f |
| 71 | static const uint8_t PC2_shuffle[] = { |
| 72 | T(14, 17, 11, 24, 1, 5), |
| 73 | T( 3, 28, 15, 6, 21, 10), |
| 74 | T(23, 19, 12, 4, 26, 8), |
| 75 | T(16, 7, 27, 20, 13, 2), |
| 76 | T(41, 52, 31, 37, 47, 55), |
| 77 | T(30, 40, 51, 45, 33, 48), |
| 78 | T(44, 49, 39, 56, 34, 53), |
| 79 | T(46, 42, 50, 36, 29, 32) |
| 80 | }; |
| 81 | #undef T |
| 82 | |
| 83 | #if CONFIG_SMALL |
| 84 | static const uint8_t S_boxes[8][32] = { |
| 85 | { |
| 86 | 0x0e, 0xf4, 0x7d, 0x41, 0xe2, 0x2f, 0xdb, 0x18, 0xa3, 0x6a, 0xc6, 0xbc, 0x95, 0x59, 0x30, 0x87, |
| 87 | 0xf4, 0xc1, 0x8e, 0x28, 0x4d, 0x96, 0x12, 0x7b, 0x5f, 0xbc, 0x39, 0xe7, 0xa3, 0x0a, 0x65, 0xd0, |
| 88 | }, { |
| 89 | 0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4, 0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a, |
| 90 | 0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21, 0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f, |
| 91 | }, { |
| 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 | }, { |
| 95 | 0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a, 0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f, |
| 96 | 0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d, 0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4, |
| 97 | }, { |
| 98 | 0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16, 0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69, |
| 99 | 0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8, 0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e, |
| 100 | }, { |
| 101 | 0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58, 0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b, |
| 102 | 0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3, 0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6, |
| 103 | }, { |
| 104 | 0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad, 0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61, |
| 105 | 0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e, 0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2, |
| 106 | }, { |
| 107 | 0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41, 0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27, |
| 108 | 0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2, 0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8, |
| 109 | } |
| 110 | }; |
| 111 | #else |
| 112 | /** |
| 113 | * This table contains the results of applying both the S-box and P-shuffle. |
| 114 | * It can be regenerated by compiling this file with -DCONFIG_SMALL -DTEST -DGENTABLES |
| 115 | */ |
| 116 | static const uint32_t S_boxes_P_shuffle[8][64] = { |
| 117 | { |
| 118 | 0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000, |
| 119 | 0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002, |
| 120 | 0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202, |
| 121 | 0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000, |
| 122 | 0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200, |
| 123 | 0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202, |
| 124 | 0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200, |
| 125 | 0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002, |
| 126 | }, |
| 127 | { |
| 128 | 0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010, |
| 129 | 0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010, |
| 130 | 0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000, |
| 131 | 0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010, |
| 132 | 0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000, |
| 133 | 0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000, |
| 134 | 0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010, |
| 135 | 0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000, |
| 136 | }, |
| 137 | { |
| 138 | 0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100, |
| 139 | 0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104, |
| 140 | 0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104, |
| 141 | 0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000, |
| 142 | 0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000, |
| 143 | 0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004, |
| 144 | 0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004, |
| 145 | 0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100, |
| 146 | }, |
| 147 | { |
| 148 | 0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000, |
| 149 | 0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000, |
| 150 | 0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040, |
| 151 | 0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040, |
| 152 | 0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000, |
| 153 | 0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040, |
| 154 | 0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040, |
| 155 | 0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040, |
| 156 | }, |
| 157 | { |
| 158 | 0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000, |
| 159 | 0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000, |
| 160 | 0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080, |
| 161 | 0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080, |
| 162 | 0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080, |
| 163 | 0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000, |
| 164 | 0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000, |
| 165 | 0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080, |
| 166 | }, |
| 167 | { |
| 168 | 0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000, |
| 169 | 0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008, |
| 170 | 0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008, |
| 171 | 0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000, |
| 172 | 0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008, |
| 173 | 0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000, |
| 174 | 0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008, |
| 175 | 0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008, |
| 176 | }, |
| 177 | { |
| 178 | 0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400, |
| 179 | 0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401, |
| 180 | 0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001, |
| 181 | 0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400, |
| 182 | 0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001, |
| 183 | 0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400, |
| 184 | 0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401, |
| 185 | 0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001, |
| 186 | }, |
| 187 | { |
| 188 | 0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000, |
| 189 | 0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020, |
| 190 | 0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800, |
| 191 | 0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000, |
| 192 | 0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820, |
| 193 | 0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820, |
| 194 | 0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000, |
| 195 | 0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800, |
| 196 | }, |
| 197 | }; |
| 198 | #endif |
| 199 | |
| 200 | static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len) { |
| 201 | int i; |
| 202 | uint64_t res = 0; |
| 203 | for (i = 0; i < shuffle_len; i++) |
| 204 | res += res + ((in >> *shuffle++) & 1); |
| 205 | return res; |
| 206 | } |
| 207 | |
| 208 | static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len) { |
| 209 | int i; |
| 210 | uint64_t res = 0; |
| 211 | shuffle += shuffle_len - 1; |
| 212 | for (i = 0; i < shuffle_len; i++) { |
| 213 | res |= (in & 1) << *shuffle--; |
| 214 | in >>= 1; |
| 215 | } |
| 216 | return res; |
| 217 | } |
| 218 | |
| 219 | static uint32_t f_func(uint32_t r, uint64_t k) { |
| 220 | int i; |
| 221 | uint32_t out = 0; |
| 222 | // rotate to get first part of E-shuffle in the lowest 6 bits |
| 223 | r = (r << 1) | (r >> 31); |
| 224 | // apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits |
| 225 | for (i = 7; i >= 0; i--) { |
| 226 | uint8_t tmp = (r ^ k) & 0x3f; |
| 227 | #if CONFIG_SMALL |
| 228 | uint8_t v = S_boxes[i][tmp >> 1]; |
| 229 | if (tmp & 1) v >>= 4; |
| 230 | out = (out >> 4) | (v << 28); |
| 231 | #else |
| 232 | out |= S_boxes_P_shuffle[i][tmp]; |
| 233 | #endif |
| 234 | // get next 6 bits of E-shuffle and round key k into the lowest bits |
| 235 | r = (r >> 4) | (r << 28); |
| 236 | k >>= 6; |
| 237 | } |
| 238 | #if CONFIG_SMALL |
| 239 | out = shuffle(out, P_shuffle, sizeof(P_shuffle)); |
| 240 | #endif |
| 241 | return out; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * @brief rotate the two halves of the expanded 56 bit key each 1 bit left |
| 246 | * |
| 247 | * Note: the specification calls this "shift", so I kept it although |
| 248 | * it is confusing. |
| 249 | */ |
| 250 | static uint64_t key_shift_left(uint64_t CDn) { |
| 251 | uint64_t carries = (CDn >> 27) & 0x10000001; |
| 252 | CDn <<= 1; |
| 253 | CDn &= ~0x10000001; |
| 254 | CDn |= carries; |
| 255 | return CDn; |
| 256 | } |
| 257 | |
| 258 | static void gen_roundkeys(uint64_t K[16], uint64_t key) { |
| 259 | int i; |
| 260 | // discard parity bits from key and shuffle it into C and D parts |
| 261 | uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle)); |
| 262 | // generate round keys |
| 263 | for (i = 0; i < 16; i++) { |
| 264 | CDn = key_shift_left(CDn); |
| 265 | if (i > 1 && i != 8 && i != 15) |
| 266 | CDn = key_shift_left(CDn); |
| 267 | K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle)); |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | static uint64_t des_encdec(uint64_t in, uint64_t K[16], int decrypt) { |
| 272 | int i; |
| 273 | // used to apply round keys in reverse order for decryption |
| 274 | decrypt = decrypt ? 15 : 0; |
| 275 | // shuffle irrelevant to security but to ease hardware implementations |
| 276 | in = shuffle(in, IP_shuffle, sizeof(IP_shuffle)); |
| 277 | for (i = 0; i < 16; i++) { |
| 278 | uint32_t f_res; |
| 279 | f_res = f_func(in, K[decrypt ^ i]); |
| 280 | in = (in << 32) | (in >> 32); |
| 281 | in ^= f_res; |
| 282 | } |
| 283 | in = (in << 32) | (in >> 32); |
| 284 | // reverse shuffle used to ease hardware implementations |
| 285 | in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle)); |
| 286 | return in; |
| 287 | } |
| 288 | |
| 289 | int av_des_init(AVDES *d, const uint8_t *key, int key_bits, av_unused int decrypt) { |
| 290 | if (key_bits != 64 && key_bits != 192) |
| 291 | return -1; |
| 292 | d->triple_des = key_bits > 64; |
| 293 | gen_roundkeys(d->round_keys[0], AV_RB64(key)); |
| 294 | if (d->triple_des) { |
| 295 | gen_roundkeys(d->round_keys[1], AV_RB64(key + 8)); |
| 296 | gen_roundkeys(d->round_keys[2], AV_RB64(key + 16)); |
| 297 | } |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static void av_des_crypt_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt, int mac) { |
| 302 | uint64_t iv_val = iv ? AV_RB64(iv) : 0; |
| 303 | while (count-- > 0) { |
| 304 | uint64_t dst_val; |
| 305 | uint64_t src_val = src ? AV_RB64(src) : 0; |
| 306 | if (decrypt) { |
| 307 | uint64_t tmp = src_val; |
| 308 | if (d->triple_des) { |
| 309 | src_val = des_encdec(src_val, d->round_keys[2], 1); |
| 310 | src_val = des_encdec(src_val, d->round_keys[1], 0); |
| 311 | } |
| 312 | dst_val = des_encdec(src_val, d->round_keys[0], 1) ^ iv_val; |
| 313 | iv_val = iv ? tmp : 0; |
| 314 | } else { |
| 315 | dst_val = des_encdec(src_val ^ iv_val, d->round_keys[0], 0); |
| 316 | if (d->triple_des) { |
| 317 | dst_val = des_encdec(dst_val, d->round_keys[1], 1); |
| 318 | dst_val = des_encdec(dst_val, d->round_keys[2], 0); |
| 319 | } |
| 320 | iv_val = iv ? dst_val : 0; |
| 321 | } |
| 322 | AV_WB64(dst, dst_val); |
| 323 | src += 8; |
| 324 | if (!mac) |
| 325 | dst += 8; |
| 326 | } |
| 327 | if (iv) |
| 328 | AV_WB64(iv, iv_val); |
| 329 | } |
| 330 | |
| 331 | void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) { |
| 332 | av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0); |
| 333 | } |
| 334 | |
| 335 | void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count) { |
| 336 | av_des_crypt_mac(d, dst, src, count, (uint8_t[8]){0}, 0, 1); |
| 337 | } |
| 338 | |
| 339 | #ifdef TEST |
| 340 | #include <stdlib.h> |
| 341 | #include <stdio.h> |
| 342 | |
| 343 | #include "time.h" |
| 344 | |
| 345 | static uint64_t rand64(void) { |
| 346 | uint64_t r = rand(); |
| 347 | r = (r << 32) | rand(); |
| 348 | return r; |
| 349 | } |
| 350 | |
| 351 | static const uint8_t test_key[] = {0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0}; |
| 352 | static const DECLARE_ALIGNED(8, uint8_t, plain)[] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10}; |
| 353 | static const DECLARE_ALIGNED(8, uint8_t, crypt)[] = {0x4a, 0xb6, 0x5b, 0x3d, 0x4b, 0x06, 0x15, 0x18}; |
| 354 | static DECLARE_ALIGNED(8, uint8_t, tmp)[8]; |
| 355 | static DECLARE_ALIGNED(8, uint8_t, large_buffer)[10002][8]; |
| 356 | static const uint8_t cbc_key[] = { |
| 357 | 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, |
| 358 | 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, |
| 359 | 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23 |
| 360 | }; |
| 361 | |
| 362 | static int run_test(int cbc, int decrypt) { |
| 363 | AVDES d; |
| 364 | int delay = cbc && !decrypt ? 2 : 1; |
| 365 | uint64_t res; |
| 366 | AV_WB64(large_buffer[0], 0x4e6f772069732074ULL); |
| 367 | AV_WB64(large_buffer[1], 0x1234567890abcdefULL); |
| 368 | AV_WB64(tmp, 0x1234567890abcdefULL); |
| 369 | av_des_init(&d, cbc_key, 192, decrypt); |
| 370 | av_des_crypt(&d, large_buffer[delay], large_buffer[0], 10000, cbc ? tmp : NULL, decrypt); |
| 371 | res = AV_RB64(large_buffer[9999 + delay]); |
| 372 | if (cbc) { |
| 373 | if (decrypt) |
| 374 | return res == 0xc5cecf63ecec514cULL; |
| 375 | else |
| 376 | return res == 0xcb191f85d1ed8439ULL; |
| 377 | } else { |
| 378 | if (decrypt) |
| 379 | return res == 0x8325397644091a0aULL; |
| 380 | else |
| 381 | return res == 0xdd17e8b8b437d232ULL; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | int main(void) { |
| 386 | AVDES d; |
| 387 | int i; |
| 388 | #ifdef GENTABLES |
| 389 | int j; |
| 390 | #endif |
| 391 | uint64_t key[3]; |
| 392 | uint64_t data; |
| 393 | uint64_t ct; |
| 394 | uint64_t roundkeys[16]; |
| 395 | srand(av_gettime()); |
| 396 | key[0] = AV_RB64(test_key); |
| 397 | data = AV_RB64(plain); |
| 398 | gen_roundkeys(roundkeys, key[0]); |
| 399 | if (des_encdec(data, roundkeys, 0) != AV_RB64(crypt)) { |
| 400 | printf("Test 1 failed\n"); |
| 401 | return 1; |
| 402 | } |
| 403 | av_des_init(&d, test_key, 64, 0); |
| 404 | av_des_crypt(&d, tmp, plain, 1, NULL, 0); |
| 405 | if (memcmp(tmp, crypt, sizeof(crypt))) { |
| 406 | printf("Public API decryption failed\n"); |
| 407 | return 1; |
| 408 | } |
| 409 | if (!run_test(0, 0) || !run_test(0, 1) || !run_test(1, 0) || !run_test(1, 1)) { |
| 410 | printf("Partial Monte-Carlo test failed\n"); |
| 411 | return 1; |
| 412 | } |
| 413 | for (i = 0; i < 1000; i++) { |
| 414 | key[0] = rand64(); key[1] = rand64(); key[2] = rand64(); |
| 415 | data = rand64(); |
| 416 | av_des_init(&d, (uint8_t*)key, 192, 0); |
| 417 | av_des_crypt(&d, (uint8_t*)&ct, (uint8_t*)&data, 1, NULL, 0); |
| 418 | av_des_init(&d, (uint8_t*)key, 192, 1); |
| 419 | av_des_crypt(&d, (uint8_t*)&ct, (uint8_t*)&ct, 1, NULL, 1); |
| 420 | if (ct != data) { |
| 421 | printf("Test 2 failed\n"); |
| 422 | return 1; |
| 423 | } |
| 424 | } |
| 425 | #ifdef GENTABLES |
| 426 | printf("static const uint32_t S_boxes_P_shuffle[8][64] = {\n"); |
| 427 | for (i = 0; i < 8; i++) { |
| 428 | printf(" {"); |
| 429 | for (j = 0; j < 64; j++) { |
| 430 | uint32_t v = S_boxes[i][j >> 1]; |
| 431 | v = j & 1 ? v >> 4 : v & 0xf; |
| 432 | v <<= 28 - 4 * i; |
| 433 | v = shuffle(v, P_shuffle, sizeof(P_shuffle)); |
| 434 | printf((j & 7) == 0 ? "\n " : " "); |
| 435 | printf("0x%08X,", v); |
| 436 | } |
| 437 | printf("\n },\n"); |
| 438 | } |
| 439 | printf("};\n"); |
| 440 | #endif |
| 441 | return 0; |
| 442 | } |
| 443 | #endif |