FFmpeg
des.c
Go to the documentation of this file.
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 static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len)
180 {
181  int i;
182  uint64_t res = 0;
183  for (i = 0; i < shuffle_len; i++)
184  res += res + ((in >> *shuffle++) & 1);
185  return res;
186 }
187 
188 static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len)
189 {
190  int i;
191  uint64_t res = 0;
192  shuffle += shuffle_len - 1;
193  for (i = 0; i < shuffle_len; i++) {
194  res |= (in & 1) << *shuffle--;
195  in >>= 1;
196  }
197  return res;
198 }
199 
200 static uint32_t f_func(uint32_t r, uint64_t k)
201 {
202  int i;
203  uint32_t out = 0;
204  // rotate to get first part of E-shuffle in the lowest 6 bits
205  r = (r << 1) | (r >> 31);
206  // apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits
207  for (i = 7; i >= 0; i--) {
208  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  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  r = (r >> 4) | (r << 28);
219  k >>= 6;
220  }
221 #if CONFIG_SMALL
222  out = shuffle(out, P_shuffle, sizeof(P_shuffle));
223 #endif
224  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 static uint64_t key_shift_left(uint64_t CDn)
234 {
235  uint64_t carries = (CDn >> 27) & 0x10000001;
236  CDn <<= 1;
237  CDn &= ~0x10000001;
238  CDn |= carries;
239  return CDn;
240 }
241 
242 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  uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle));
247  // generate round keys
248  for (i = 0; i < 16; i++) {
249  CDn = key_shift_left(CDn);
250  if (i > 1 && i != 8 && i != 15)
251  CDn = key_shift_left(CDn);
252  K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle));
253  }
254 }
255 
256 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  decrypt = decrypt ? 15 : 0;
261  // shuffle irrelevant to security but to ease hardware implementations
262  in = shuffle(in, IP_shuffle, sizeof(IP_shuffle));
263  for (i = 0; i < 16; i++) {
264  uint32_t f_res;
265  f_res = f_func(in, K[decrypt ^ i]);
266  in = (in << 32) | (in >> 32);
267  in ^= f_res;
268  }
269  in = (in << 32) | (in >> 32);
270  // reverse shuffle used to ease hardware implementations
271  in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle));
272  return in;
273 }
274 
275 AVDES *av_des_alloc(void)
276 {
277  return av_mallocz(sizeof(struct AVDES));
278 }
279 
280 int av_des_init(AVDES *d, const uint8_t *key, int key_bits, av_unused int decrypt) {
281  if (key_bits != 64 && key_bits != 192)
282  return AVERROR(EINVAL);
283  d->triple_des = key_bits > 64;
284  gen_roundkeys(d->round_keys[0], AV_RB64(key));
285  if (d->triple_des) {
286  gen_roundkeys(d->round_keys[1], AV_RB64(key + 8));
287  gen_roundkeys(d->round_keys[2], AV_RB64(key + 16));
288  }
289  return 0;
290 }
291 
292 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  uint64_t iv_val = iv ? AV_RB64(iv) : 0;
296  while (count-- > 0) {
297  uint64_t dst_val;
298  uint64_t src_val = src ? AV_RB64(src) : 0;
299  if (decrypt) {
300  uint64_t tmp = src_val;
301  if (d->triple_des) {
302  src_val = des_encdec(src_val, d->round_keys[2], 1);
303  src_val = des_encdec(src_val, d->round_keys[1], 0);
304  }
305  dst_val = des_encdec(src_val, d->round_keys[0], 1) ^ iv_val;
306  iv_val = iv ? tmp : 0;
307  } else {
308  dst_val = des_encdec(src_val ^ iv_val, d->round_keys[0], 0);
309  if (d->triple_des) {
310  dst_val = des_encdec(dst_val, d->round_keys[1], 1);
311  dst_val = des_encdec(dst_val, d->round_keys[2], 0);
312  }
313  iv_val = iv ? dst_val : 0;
314  }
315  AV_WB64(dst, dst_val);
316  src += 8;
317  if (!mac)
318  dst += 8;
319  }
320  if (iv)
321  AV_WB64(iv, iv_val);
322 }
323 
324 void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src,
325  int count, uint8_t *iv, int decrypt)
326 {
327  av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0);
328 }
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 }
T
#define T(a, b, c, d, e, f, g, h)
Definition: des.c:73
av_des_init
int av_des_init(AVDES *d, const uint8_t *key, int key_bits, av_unused int decrypt)
Definition: des.c:280
r
const char * r
Definition: vf_curves.c:127
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
out
FILE * out
Definition: movenc.c:55
av_des_crypt_mac
static void av_des_crypt_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt, int mac)
Definition: des.c:292
shuffle_inv
static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len)
Definition: des.c:188
av_des_crypt
void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the DES algorithm.
Definition: des.c:324
av_unused
#define av_unused
Definition: attributes.h:131
AV_WB64
#define AV_WB64(p, v)
Definition: intreadwrite.h:429
AVDES::triple_des
int triple_des
Definition: des.h:35
gen_roundkeys
static void gen_roundkeys(uint64_t K[16], uint64_t key)
Definition: des.c:242
PC1_shuffle
static const uint8_t PC1_shuffle[]
Definition: des.c:61
IP_shuffle
static const uint8_t IP_shuffle[]
Definition: des.c:33
intreadwrite.h
av_des_mac
void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count)
Calculates CBC-MAC using the DES algorithm.
Definition: des.c:330
key
const char * key
Definition: hwcontext_opencl.c:189
tmp
static uint8_t tmp[8]
Definition: des.c:41
AVDES::round_keys
uint64_t round_keys[3][16]
Definition: des.h:34
error.h
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:83
des.h
PC2_shuffle
static const uint8_t PC2_shuffle[]
Definition: des.c:74
S_boxes_P_shuffle
static const uint32_t S_boxes_P_shuffle[8][64]
This table contains the results of applying both the S-box and P-shuffle.
Definition: des.c:111
f_func
static uint32_t f_func(uint32_t r, uint64_t k)
Definition: des.c:200
attributes.h
av_des_alloc
AVDES * av_des_alloc(void)
Allocate an AVDES context.
Definition: des.c:275
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
key_shift_left
static uint64_t key_shift_left(uint64_t CDn)
rotate the two halves of the expanded 56 bit key each 1 bit left
Definition: des.c:233
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
des_encdec
static uint64_t des_encdec(uint64_t in, uint64_t K[16], int decrypt)
Definition: des.c:256
AVDES
Definition: des.h:33
mem.h
K
#define K
Definition: palette.c:25
shuffle
static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len)
Definition: des.c:179
AV_RB64
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:95
src
#define src
Definition: vp8dsp.c:248
Generated on Mon Nov 25 2024 19:22:39 for FFmpeg by   doxygen 1.8.17