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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 |