FFmpeg
cast5.c
Go to the documentation of this file.
1 /*
2  * An implementation of the CAST128 algorithm as mentioned in RFC2144
3  * Copyright (c) 2014 Supraja Meedinti
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 "libavutil/cast5.h"
23 #include "libavutil/log.h"
24 
25 int main(int argc, char** argv)
26 {
27 
28  static const uint8_t Key[3][16] = {
29  {0x01, 0x23, 0x45, 0x67, 0x12, 0x34, 0x56, 0x78, 0x23, 0x45, 0x67, 0x89, 0x34, 0x56, 0x78, 0x9a},
30  {0x01, 0x23, 0x45, 0x67, 0x12, 0x34, 0x56, 0x78, 0x23, 0x45},
31  {0x01, 0x23, 0x45, 0x67, 0x12}
32  };
33  static const uint8_t rpt[8] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef};
34  static const uint8_t rct[3][8] = {
35  {0x23, 0x8b, 0x4f, 0xe5, 0x84, 0x7e, 0x44, 0xb2},
36  {0xeb, 0x6a, 0x71, 0x1a, 0x2c, 0x02, 0x27, 0x1b},
37  {0x7a, 0xc8, 0x16, 0xd1, 0x6e, 0x9b, 0x30, 0x2e}
38  };
39  static const uint8_t rct2[2][16] = {
40  {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6, 0xb3, 0x43, 0x6f, 0xb8, 0x9d, 0x6d, 0xca, 0x92},
41  {0xb2, 0xc9, 0x5e, 0xb0, 0x0c, 0x31, 0xad, 0x71, 0x80, 0xac, 0x05, 0xb8, 0xe8, 0x3d, 0x69, 0x6e}
42  };
43  static const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
44  static uint8_t rpt2[2][16];
45  int i, j, err = 0;
46  static const int key_bits[3] = {128, 80, 40};
47  uint8_t temp[8];
48  struct AVCAST5 *cs;
49  cs = av_cast5_alloc();
50  if (!cs)
51  return 1;
52  for (j = 0; j < 3; j++){
53 
54  av_cast5_init(cs, Key[j], key_bits[j]);
55  av_cast5_crypt(cs, temp, rpt, 1, 0);
56  for (i = 0;i < 8; i++){
57  if (rct[j][i] != temp[i]){
58  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]);
59  err = 1;
60  }
61  }
62 
63  av_cast5_crypt(cs, temp, rct[j], 1, 1);
64  for (i =0; i < 8; i++) {
65  if (rpt[i] != temp[i]) {
66  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]);
67  err = 1;
68  }
69  }
70  }
71  memcpy(rpt2[0], Key[0], 16);
72  memcpy(rpt2[1], Key[0], 16);
73  for (i = 0; i < 1000000; i++){
74  av_cast5_init(cs, rpt2[1], 128);
75  av_cast5_crypt(cs, rpt2[0], rpt2[0], 2, 0);
76  av_cast5_init(cs, rpt2[0], 128);
77  av_cast5_crypt(cs, rpt2[1], rpt2[1], 2, 0);
78  }
79  for (j = 0; j < 2; j++) {
80  for (i = 0; i < 16; i++) {
81  if (rct2[j][i] != rpt2[j][i]) {
82  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[j][i], rpt2[j][i]);
83  err = 1;
84  }
85  }
86  }
87  for (j = 0; j < 3; j++) {
88 
89  av_cast5_init(cs, Key[j], key_bits[j]);
90  memcpy(temp, iv, 8);
91  av_cast5_crypt2(cs, rpt2[0], rct2[0], 2, temp, 0);
92  memcpy(temp, iv, 8);
93  av_cast5_crypt2(cs, rpt2[0], rpt2[0], 2, temp, 1);
94  for (i = 0; i < 16; i++) {
95  if (rct2[0][i] != rpt2[0][i]) {
96  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[0][i], rpt2[0][i]);
97  err = 1;
98  }
99  }
100  }
101  av_free(cs);
102  return err;
103 }
av_cast5_alloc
struct AVCAST5 * av_cast5_alloc(void)
Allocate an AVCAST5 context To free the struct: av_free(ptr)
Definition: cast5.c:451
AVCAST5
Definition: cast5.c:71
av_cast5_crypt
void av_cast5_crypt(AVCAST5 *cs, uint8_t *dst, const uint8_t *src, int count, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context, ECB mode only.
Definition: cast5.c:496
cast5.h
Public header for libavutil CAST5 algorithm.
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
main
int main(int argc, char **argv)
Definition: cast5.c:25
NULL
#define NULL
Definition: coverity.c:32
log.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
av_cast5_init
av_cold int av_cast5_init(AVCAST5 *cs, const uint8_t *key, int key_bits)
Initialize an AVCAST5 context.
Definition: cast5.c:456
temp
else temp
Definition: vf_mcdeint.c:248
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
av_cast5_crypt2
void av_cast5_crypt2(AVCAST5 *cs, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: cast5.c:476