LCOV - code coverage report
Current view: top level - src/libavutil - des.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 81 85 95.3 %
Date: 2017-01-21 09:32:20 Functions: 10 11 90.9 %

          Line data    Source code
       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 <stdint.h>
      23             : 
      24             : #include "avutil.h"
      25             : #include "common.h"
      26             : #include "intreadwrite.h"
      27             : #include "mem.h"
      28             : #include "des.h"
      29             : 
      30             : #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
      31             : static const uint8_t IP_shuffle[] = {
      32             :     T(58, 50, 42, 34, 26, 18, 10, 2),
      33             :     T(60, 52, 44, 36, 28, 20, 12, 4),
      34             :     T(62, 54, 46, 38, 30, 22, 14, 6),
      35             :     T(64, 56, 48, 40, 32, 24, 16, 8),
      36             :     T(57, 49, 41, 33, 25, 17,  9, 1),
      37             :     T(59, 51, 43, 35, 27, 19, 11, 3),
      38             :     T(61, 53, 45, 37, 29, 21, 13, 5),
      39             :     T(63, 55, 47, 39, 31, 23, 15, 7)
      40             : };
      41             : #undef T
      42             : 
      43             : #if CONFIG_SMALL || defined(GENTABLES)
      44             : #define T(a, b, c, d) 32 - a, 32 - b, 32 - c, 32 - d
      45             : static const uint8_t P_shuffle[] = {
      46             :     T(16,  7, 20, 21),
      47             :     T(29, 12, 28, 17),
      48             :     T( 1, 15, 23, 26),
      49             :     T( 5, 18, 31, 10),
      50             :     T( 2,  8, 24, 14),
      51             :     T(32, 27,  3,  9),
      52             :     T(19, 13, 30,  6),
      53             :     T(22, 11,  4, 25)
      54             : };
      55             : #undef T
      56             : #endif
      57             : 
      58             : #define T(a, b, c, d, e, f, g) 64 - a, 64 - b, 64 - c, 64 - d, 64 - e, 64 - f, 64 - g
      59             : static const uint8_t PC1_shuffle[] = {
      60             :     T(57, 49, 41, 33, 25, 17,  9),
      61             :     T( 1, 58, 50, 42, 34, 26, 18),
      62             :     T(10,  2, 59, 51, 43, 35, 27),
      63             :     T(19, 11,  3, 60, 52, 44, 36),
      64             :     T(63, 55, 47, 39, 31, 23, 15),
      65             :     T( 7, 62, 54, 46, 38, 30, 22),
      66             :     T(14,  6, 61, 53, 45, 37, 29),
      67             :     T(21, 13,  5, 28, 20, 12,  4)
      68             : };
      69             : #undef T
      70             : 
      71             : #define T(a, b, c, d, e, f) 56 - a, 56 - b, 56 - c, 56 - d, 56 - e, 56 - f
      72             : static const uint8_t PC2_shuffle[] = {
      73             :     T(14, 17, 11, 24,  1,  5),
      74             :     T( 3, 28, 15,  6, 21, 10),
      75             :     T(23, 19, 12,  4, 26,  8),
      76             :     T(16,  7, 27, 20, 13,  2),
      77             :     T(41, 52, 31, 37, 47, 55),
      78             :     T(30, 40, 51, 45, 33, 48),
      79             :     T(44, 49, 39, 56, 34, 53),
      80             :     T(46, 42, 50, 36, 29, 32)
      81             : };
      82             : #undef T
      83             : 
      84             : #if CONFIG_SMALL
      85             : static const uint8_t S_boxes[8][32] = {
      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             :     { 0x3f, 0xd1, 0x48, 0x7e, 0xf6, 0x2b, 0x83, 0xe4, 0xc9, 0x07, 0x12, 0xad, 0x6c, 0x90, 0xb5, 0x5a,
      89             :       0xd0, 0x8e, 0xa7, 0x1b, 0x3a, 0xf4, 0x4d, 0x21, 0xb5, 0x68, 0x7c, 0xc6, 0x09, 0x53, 0xe2, 0x9f, },
      90             :     { 0xda, 0x70, 0x09, 0x9e, 0x36, 0x43, 0x6f, 0xa5, 0x21, 0x8d, 0x5c, 0xe7, 0xcb, 0xb4, 0xf2, 0x18,
      91             :       0x1d, 0xa6, 0xd4, 0x09, 0x68, 0x9f, 0x83, 0x70, 0x4b, 0xf1, 0xe2, 0x3c, 0xb5, 0x5a, 0x2e, 0xc7, },
      92             :     { 0xd7, 0x8d, 0xbe, 0x53, 0x60, 0xf6, 0x09, 0x3a, 0x41, 0x72, 0x28, 0xc5, 0x1b, 0xac, 0xe4, 0x9f,
      93             :       0x3a, 0xf6, 0x09, 0x60, 0xac, 0x1b, 0xd7, 0x8d, 0x9f, 0x41, 0x53, 0xbe, 0xc5, 0x72, 0x28, 0xe4, },
      94             :     { 0xe2, 0xbc, 0x24, 0xc1, 0x47, 0x7a, 0xdb, 0x16, 0x58, 0x05, 0xf3, 0xaf, 0x3d, 0x90, 0x8e, 0x69,
      95             :       0xb4, 0x82, 0xc1, 0x7b, 0x1a, 0xed, 0x27, 0xd8, 0x6f, 0xf9, 0x0c, 0x95, 0xa6, 0x43, 0x50, 0x3e, },
      96             :     { 0xac, 0xf1, 0x4a, 0x2f, 0x79, 0xc2, 0x96, 0x58, 0x60, 0x1d, 0xd3, 0xe4, 0x0e, 0xb7, 0x35, 0x8b,
      97             :       0x49, 0x3e, 0x2f, 0xc5, 0x92, 0x58, 0xfc, 0xa3, 0xb7, 0xe0, 0x14, 0x7a, 0x61, 0x0d, 0x8b, 0xd6, },
      98             :     { 0xd4, 0x0b, 0xb2, 0x7e, 0x4f, 0x90, 0x18, 0xad, 0xe3, 0x3c, 0x59, 0xc7, 0x25, 0xfa, 0x86, 0x61,
      99             :       0x61, 0xb4, 0xdb, 0x8d, 0x1c, 0x43, 0xa7, 0x7e, 0x9a, 0x5f, 0x06, 0xf8, 0xe0, 0x25, 0x39, 0xc2, },
     100             :     { 0x1d, 0xf2, 0xd8, 0x84, 0xa6, 0x3f, 0x7b, 0x41, 0xca, 0x59, 0x63, 0xbe, 0x05, 0xe0, 0x9c, 0x27,
     101             :       0x27, 0x1b, 0xe4, 0x71, 0x49, 0xac, 0x8e, 0xd2, 0xf0, 0xc6, 0x9a, 0x0d, 0x3f, 0x53, 0x65, 0xb8,
     102             :     }
     103             : };
     104             : #else
     105             : /**
     106             :  * This table contains the results of applying both the S-box and P-shuffle.
     107             :  * It can be regenerated by compiling tests/des.c with "-DCONFIG_SMALL -DGENTABLES".
     108             :  */
     109             : static const uint32_t S_boxes_P_shuffle[8][64] = {
     110             :     { 0x00808200, 0x00000000, 0x00008000, 0x00808202, 0x00808002, 0x00008202, 0x00000002, 0x00008000,
     111             :       0x00000200, 0x00808200, 0x00808202, 0x00000200, 0x00800202, 0x00808002, 0x00800000, 0x00000002,
     112             :       0x00000202, 0x00800200, 0x00800200, 0x00008200, 0x00008200, 0x00808000, 0x00808000, 0x00800202,
     113             :       0x00008002, 0x00800002, 0x00800002, 0x00008002, 0x00000000, 0x00000202, 0x00008202, 0x00800000,
     114             :       0x00008000, 0x00808202, 0x00000002, 0x00808000, 0x00808200, 0x00800000, 0x00800000, 0x00000200,
     115             :       0x00808002, 0x00008000, 0x00008200, 0x00800002, 0x00000200, 0x00000002, 0x00800202, 0x00008202,
     116             :       0x00808202, 0x00008002, 0x00808000, 0x00800202, 0x00800002, 0x00000202, 0x00008202, 0x00808200,
     117             :       0x00000202, 0x00800200, 0x00800200, 0x00000000, 0x00008002, 0x00008200, 0x00000000, 0x00808002, },
     118             :     { 0x40084010, 0x40004000, 0x00004000, 0x00084010, 0x00080000, 0x00000010, 0x40080010, 0x40004010,
     119             :       0x40000010, 0x40084010, 0x40084000, 0x40000000, 0x40004000, 0x00080000, 0x00000010, 0x40080010,
     120             :       0x00084000, 0x00080010, 0x40004010, 0x00000000, 0x40000000, 0x00004000, 0x00084010, 0x40080000,
     121             :       0x00080010, 0x40000010, 0x00000000, 0x00084000, 0x00004010, 0x40084000, 0x40080000, 0x00004010,
     122             :       0x00000000, 0x00084010, 0x40080010, 0x00080000, 0x40004010, 0x40080000, 0x40084000, 0x00004000,
     123             :       0x40080000, 0x40004000, 0x00000010, 0x40084010, 0x00084010, 0x00000010, 0x00004000, 0x40000000,
     124             :       0x00004010, 0x40084000, 0x00080000, 0x40000010, 0x00080010, 0x40004010, 0x40000010, 0x00080010,
     125             :       0x00084000, 0x00000000, 0x40004000, 0x00004010, 0x40000000, 0x40080010, 0x40084010, 0x00084000, },
     126             :     { 0x00000104, 0x04010100, 0x00000000, 0x04010004, 0x04000100, 0x00000000, 0x00010104, 0x04000100,
     127             :       0x00010004, 0x04000004, 0x04000004, 0x00010000, 0x04010104, 0x00010004, 0x04010000, 0x00000104,
     128             :       0x04000000, 0x00000004, 0x04010100, 0x00000100, 0x00010100, 0x04010000, 0x04010004, 0x00010104,
     129             :       0x04000104, 0x00010100, 0x00010000, 0x04000104, 0x00000004, 0x04010104, 0x00000100, 0x04000000,
     130             :       0x04010100, 0x04000000, 0x00010004, 0x00000104, 0x00010000, 0x04010100, 0x04000100, 0x00000000,
     131             :       0x00000100, 0x00010004, 0x04010104, 0x04000100, 0x04000004, 0x00000100, 0x00000000, 0x04010004,
     132             :       0x04000104, 0x00010000, 0x04000000, 0x04010104, 0x00000004, 0x00010104, 0x00010100, 0x04000004,
     133             :       0x04010000, 0x04000104, 0x00000104, 0x04010000, 0x00010104, 0x00000004, 0x04010004, 0x00010100, },
     134             :     { 0x80401000, 0x80001040, 0x80001040, 0x00000040, 0x00401040, 0x80400040, 0x80400000, 0x80001000,
     135             :       0x00000000, 0x00401000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00400040, 0x80400000,
     136             :       0x80000000, 0x00001000, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x80001000, 0x00001040,
     137             :       0x80400040, 0x80000000, 0x00001040, 0x00400040, 0x00001000, 0x00401040, 0x80401040, 0x80000040,
     138             :       0x00400040, 0x80400000, 0x00401000, 0x80401040, 0x80000040, 0x00000000, 0x00000000, 0x00401000,
     139             :       0x00001040, 0x00400040, 0x80400040, 0x80000000, 0x80401000, 0x80001040, 0x80001040, 0x00000040,
     140             :       0x80401040, 0x80000040, 0x80000000, 0x00001000, 0x80400000, 0x80001000, 0x00401040, 0x80400040,
     141             :       0x80001000, 0x00001040, 0x00400000, 0x80401000, 0x00000040, 0x00400000, 0x00001000, 0x00401040, },
     142             :     { 0x00000080, 0x01040080, 0x01040000, 0x21000080, 0x00040000, 0x00000080, 0x20000000, 0x01040000,
     143             :       0x20040080, 0x00040000, 0x01000080, 0x20040080, 0x21000080, 0x21040000, 0x00040080, 0x20000000,
     144             :       0x01000000, 0x20040000, 0x20040000, 0x00000000, 0x20000080, 0x21040080, 0x21040080, 0x01000080,
     145             :       0x21040000, 0x20000080, 0x00000000, 0x21000000, 0x01040080, 0x01000000, 0x21000000, 0x00040080,
     146             :       0x00040000, 0x21000080, 0x00000080, 0x01000000, 0x20000000, 0x01040000, 0x21000080, 0x20040080,
     147             :       0x01000080, 0x20000000, 0x21040000, 0x01040080, 0x20040080, 0x00000080, 0x01000000, 0x21040000,
     148             :       0x21040080, 0x00040080, 0x21000000, 0x21040080, 0x01040000, 0x00000000, 0x20040000, 0x21000000,
     149             :       0x00040080, 0x01000080, 0x20000080, 0x00040000, 0x00000000, 0x20040000, 0x01040080, 0x20000080, },
     150             :     { 0x10000008, 0x10200000, 0x00002000, 0x10202008, 0x10200000, 0x00000008, 0x10202008, 0x00200000,
     151             :       0x10002000, 0x00202008, 0x00200000, 0x10000008, 0x00200008, 0x10002000, 0x10000000, 0x00002008,
     152             :       0x00000000, 0x00200008, 0x10002008, 0x00002000, 0x00202000, 0x10002008, 0x00000008, 0x10200008,
     153             :       0x10200008, 0x00000000, 0x00202008, 0x10202000, 0x00002008, 0x00202000, 0x10202000, 0x10000000,
     154             :       0x10002000, 0x00000008, 0x10200008, 0x00202000, 0x10202008, 0x00200000, 0x00002008, 0x10000008,
     155             :       0x00200000, 0x10002000, 0x10000000, 0x00002008, 0x10000008, 0x10202008, 0x00202000, 0x10200000,
     156             :       0x00202008, 0x10202000, 0x00000000, 0x10200008, 0x00000008, 0x00002000, 0x10200000, 0x00202008,
     157             :       0x00002000, 0x00200008, 0x10002008, 0x00000000, 0x10202000, 0x10000000, 0x00200008, 0x10002008, },
     158             :     { 0x00100000, 0x02100001, 0x02000401, 0x00000000, 0x00000400, 0x02000401, 0x00100401, 0x02100400,
     159             :       0x02100401, 0x00100000, 0x00000000, 0x02000001, 0x00000001, 0x02000000, 0x02100001, 0x00000401,
     160             :       0x02000400, 0x00100401, 0x00100001, 0x02000400, 0x02000001, 0x02100000, 0x02100400, 0x00100001,
     161             :       0x02100000, 0x00000400, 0x00000401, 0x02100401, 0x00100400, 0x00000001, 0x02000000, 0x00100400,
     162             :       0x02000000, 0x00100400, 0x00100000, 0x02000401, 0x02000401, 0x02100001, 0x02100001, 0x00000001,
     163             :       0x00100001, 0x02000000, 0x02000400, 0x00100000, 0x02100400, 0x00000401, 0x00100401, 0x02100400,
     164             :       0x00000401, 0x02000001, 0x02100401, 0x02100000, 0x00100400, 0x00000000, 0x00000001, 0x02100401,
     165             :       0x00000000, 0x00100401, 0x02100000, 0x00000400, 0x02000001, 0x02000400, 0x00000400, 0x00100001, },
     166             :     { 0x08000820, 0x00000800, 0x00020000, 0x08020820, 0x08000000, 0x08000820, 0x00000020, 0x08000000,
     167             :       0x00020020, 0x08020000, 0x08020820, 0x00020800, 0x08020800, 0x00020820, 0x00000800, 0x00000020,
     168             :       0x08020000, 0x08000020, 0x08000800, 0x00000820, 0x00020800, 0x00020020, 0x08020020, 0x08020800,
     169             :       0x00000820, 0x00000000, 0x00000000, 0x08020020, 0x08000020, 0x08000800, 0x00020820, 0x00020000,
     170             :       0x00020820, 0x00020000, 0x08020800, 0x00000800, 0x00000020, 0x08020020, 0x00000800, 0x00020820,
     171             :       0x08000800, 0x00000020, 0x08000020, 0x08020000, 0x08020020, 0x08000000, 0x00020000, 0x08000820,
     172             :       0x00000000, 0x08020820, 0x00020020, 0x08000020, 0x08020000, 0x08000800, 0x08000820, 0x00000000,
     173             :       0x08020820, 0x00020800, 0x00020800, 0x00000820, 0x00000820, 0x00020020, 0x08000000, 0x08020800, },
     174             : };
     175             : #endif
     176             : 
     177      237996 : static uint64_t shuffle(uint64_t in, const uint8_t *shuffle, int shuffle_len)
     178             : {
     179             :     int i;
     180      237996 :     uint64_t res = 0;
     181    13738956 :     for (i = 0; i < shuffle_len; i++)
     182    13500960 :         res += res + ((in >> *shuffle++) & 1);
     183      237996 :     return res;
     184             : }
     185             : 
     186      126544 : static uint64_t shuffle_inv(uint64_t in, const uint8_t *shuffle, int shuffle_len)
     187             : {
     188             :     int i;
     189      126544 :     uint64_t res = 0;
     190      126544 :     shuffle += shuffle_len - 1;
     191     8225360 :     for (i = 0; i < shuffle_len; i++) {
     192     8098816 :         res |= (in & 1) << *shuffle--;
     193     8098816 :         in >>= 1;
     194             :     }
     195      126544 :     return res;
     196             : }
     197             : 
     198     2024704 : static uint32_t f_func(uint32_t r, uint64_t k)
     199             : {
     200             :     int i;
     201     2024704 :     uint32_t out = 0;
     202             :     // rotate to get first part of E-shuffle in the lowest 6 bits
     203     2024704 :     r = (r << 1) | (r >> 31);
     204             :     // apply S-boxes, those compress the data again from 8 * 6 to 8 * 4 bits
     205    18222336 :     for (i = 7; i >= 0; i--) {
     206    16197632 :         uint8_t tmp = (r ^ k) & 0x3f;
     207             : #if CONFIG_SMALL
     208             :         uint8_t v = S_boxes[i][tmp >> 1];
     209             :         if (tmp & 1)
     210             :             v >>= 4;
     211             :         out = (out >> 4) | (v << 28);
     212             : #else
     213    16197632 :         out |= S_boxes_P_shuffle[i][tmp];
     214             : #endif
     215             :         // get next 6 bits of E-shuffle and round key k into the lowest bits
     216    16197632 :         r   = (r >> 4) | (r << 28);
     217    16197632 :         k >>= 6;
     218             :     }
     219             : #if CONFIG_SMALL
     220             :     out = shuffle(out, P_shuffle, sizeof(P_shuffle));
     221             : #endif
     222     2024704 :     return out;
     223             : }
     224             : 
     225             : /**
     226             :  * @brief rotate the two halves of the expanded 56 bit key each 1 bit left
     227             :  *
     228             :  * Note: the specification calls this "shift", so I kept it although
     229             :  * it is confusing.
     230             :  */
     231      183568 : static uint64_t key_shift_left(uint64_t CDn)
     232             : {
     233      183568 :     uint64_t carries = (CDn >> 27) & 0x10000001;
     234      183568 :     CDn <<= 1;
     235      183568 :     CDn  &= ~0x10000001;
     236      183568 :     CDn  |= carries;
     237      183568 :     return CDn;
     238             : }
     239             : 
     240        6556 : static void gen_roundkeys(uint64_t K[16], uint64_t key)
     241             : {
     242             :     int i;
     243             :     // discard parity bits from key and shuffle it into C and D parts
     244        6556 :     uint64_t CDn = shuffle(key, PC1_shuffle, sizeof(PC1_shuffle));
     245             :     // generate round keys
     246      111452 :     for (i = 0; i < 16; i++) {
     247      104896 :         CDn = key_shift_left(CDn);
     248      104896 :         if (i > 1 && i != 8 && i != 15)
     249       78672 :             CDn = key_shift_left(CDn);
     250      104896 :         K[i] = shuffle(CDn, PC2_shuffle, sizeof(PC2_shuffle));
     251             :     }
     252        6556 : }
     253             : 
     254      126544 : static uint64_t des_encdec(uint64_t in, uint64_t K[16], int decrypt)
     255             : {
     256             :     int i;
     257             :     // used to apply round keys in reverse order for decryption
     258      126544 :     decrypt = decrypt ? 15 : 0;
     259             :     // shuffle irrelevant to security but to ease hardware implementations
     260      126544 :     in = shuffle(in, IP_shuffle, sizeof(IP_shuffle));
     261     2151248 :     for (i = 0; i < 16; i++) {
     262             :         uint32_t f_res;
     263     2024704 :         f_res = f_func(in, K[decrypt ^ i]);
     264     2024704 :         in    = (in << 32) | (in >> 32);
     265     2024704 :         in   ^= f_res;
     266             :     }
     267      126544 :     in = (in << 32) | (in >> 32);
     268             :     // reverse shuffle used to ease hardware implementations
     269      126544 :     in = shuffle_inv(in, IP_shuffle, sizeof(IP_shuffle));
     270      126544 :     return in;
     271             : }
     272             : 
     273         542 : AVDES *av_des_alloc(void)
     274             : {
     275         542 :     return av_mallocz(sizeof(struct AVDES));
     276             : }
     277             : 
     278        2547 : int av_des_init(AVDES *d, const uint8_t *key, int key_bits, av_unused int decrypt) {
     279        2547 :     if (key_bits != 64 && key_bits != 192)
     280           0 :         return AVERROR(EINVAL);
     281        2547 :     d->triple_des = key_bits > 64;
     282        2547 :     gen_roundkeys(d->round_keys[0], AV_RB64(key));
     283        2547 :     if (d->triple_des) {
     284        2004 :         gen_roundkeys(d->round_keys[1], AV_RB64(key +  8));
     285        2004 :         gen_roundkeys(d->round_keys[2], AV_RB64(key + 16));
     286             :     }
     287        2547 :     return 0;
     288             : }
     289             : 
     290        2547 : static void av_des_crypt_mac(AVDES *d, uint8_t *dst, const uint8_t *src,
     291             :                              int count, uint8_t *iv, int decrypt, int mac)
     292             : {
     293        2547 :     uint64_t iv_val = iv ? AV_RB64(iv) : 0;
     294       47637 :     while (count-- > 0) {
     295             :         uint64_t dst_val;
     296       42543 :         uint64_t src_val = src ? AV_RB64(src) : 0;
     297       42543 :         if (decrypt) {
     298       21542 :             uint64_t tmp = src_val;
     299       21542 :             if (d->triple_des) {
     300       21000 :                 src_val = des_encdec(src_val, d->round_keys[2], 1);
     301       21000 :                 src_val = des_encdec(src_val, d->round_keys[1], 0);
     302             :             }
     303       21542 :             dst_val = des_encdec(src_val, d->round_keys[0], 1) ^ iv_val;
     304       21542 :             iv_val  = iv ? tmp : 0;
     305             :         } else {
     306       21001 :             dst_val = des_encdec(src_val ^ iv_val, d->round_keys[0], 0);
     307       21001 :             if (d->triple_des) {
     308       21000 :                 dst_val = des_encdec(dst_val, d->round_keys[1], 1);
     309       21000 :                 dst_val = des_encdec(dst_val, d->round_keys[2], 0);
     310             :             }
     311       21001 :             iv_val = iv ? dst_val : 0;
     312             :         }
     313       42543 :         AV_WB64(dst, dst_val);
     314       42543 :         src += 8;
     315       42543 :         if (!mac)
     316       42543 :             dst += 8;
     317             :     }
     318        2547 :     if (iv)
     319           2 :         AV_WB64(iv, iv_val);
     320        2547 : }
     321             : 
     322        2547 : void av_des_crypt(AVDES *d, uint8_t *dst, const uint8_t *src,
     323             :                   int count, uint8_t *iv, int decrypt)
     324             : {
     325        2547 :     av_des_crypt_mac(d, dst, src, count, iv, decrypt, 0);
     326        2547 : }
     327             : 
     328           0 : void av_des_mac(AVDES *d, uint8_t *dst, const uint8_t *src, int count)
     329             : {
     330           0 :     av_des_crypt_mac(d, dst, src, count, (uint8_t[8]) { 0 }, 0, 1);
     331           0 : }

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