FFmpeg
cast5.c
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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 <stddef.h>
23 #include <string.h>
24 
25 #include "libavutil/cast5.h"
26 #include "libavutil/log.h"
27 #include "libavutil/mem.h"
28 
29 int main(int argc, char** argv)
30 {
31 
32  static const uint8_t Key[3][16] = {
33  {0x01, 0x23, 0x45, 0x67, 0x12, 0x34, 0x56, 0x78, 0x23, 0x45, 0x67, 0x89, 0x34, 0x56, 0x78, 0x9a},
34  {0x01, 0x23, 0x45, 0x67, 0x12, 0x34, 0x56, 0x78, 0x23, 0x45},
35  {0x01, 0x23, 0x45, 0x67, 0x12}
36  };
37  static const uint8_t rpt[8] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef};
38  static const uint8_t rct[3][8] = {
39  {0x23, 0x8b, 0x4f, 0xe5, 0x84, 0x7e, 0x44, 0xb2},
40  {0xeb, 0x6a, 0x71, 0x1a, 0x2c, 0x02, 0x27, 0x1b},
41  {0x7a, 0xc8, 0x16, 0xd1, 0x6e, 0x9b, 0x30, 0x2e}
42  };
43  static const uint8_t rct2[2][16] = {
44  {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6, 0xb3, 0x43, 0x6f, 0xb8, 0x9d, 0x6d, 0xca, 0x92},
45  {0xb2, 0xc9, 0x5e, 0xb0, 0x0c, 0x31, 0xad, 0x71, 0x80, 0xac, 0x05, 0xb8, 0xe8, 0x3d, 0x69, 0x6e}
46  };
47  static const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
48  static uint8_t rpt2[2][16];
49  int i, j, err = 0;
50  static const int key_bits[3] = {128, 80, 40};
51  uint8_t temp[8];
52  struct AVCAST5 *cs;
53  cs = av_cast5_alloc();
54  if (!cs)
55  return 1;
56  for (j = 0; j < 3; j++){
57 
58  av_cast5_init(cs, Key[j], key_bits[j]);
59  av_cast5_crypt(cs, temp, rpt, 1, 0);
60  for (i = 0;i < 8; i++){
61  if (rct[j][i] != temp[i]){
62  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]);
63  err = 1;
64  }
65  }
66 
67  av_cast5_crypt(cs, temp, rct[j], 1, 1);
68  for (i =0; i < 8; i++) {
69  if (rpt[i] != temp[i]) {
70  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]);
71  err = 1;
72  }
73  }
74  }
75  memcpy(rpt2[0], Key[0], 16);
76  memcpy(rpt2[1], Key[0], 16);
77  for (i = 0; i < 1000000; i++){
78  av_cast5_init(cs, rpt2[1], 128);
79  av_cast5_crypt(cs, rpt2[0], rpt2[0], 2, 0);
80  av_cast5_init(cs, rpt2[0], 128);
81  av_cast5_crypt(cs, rpt2[1], rpt2[1], 2, 0);
82  }
83  for (j = 0; j < 2; j++) {
84  for (i = 0; i < 16; i++) {
85  if (rct2[j][i] != rpt2[j][i]) {
86  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[j][i], rpt2[j][i]);
87  err = 1;
88  }
89  }
90  }
91  for (j = 0; j < 3; j++) {
92 
93  av_cast5_init(cs, Key[j], key_bits[j]);
94  memcpy(temp, iv, 8);
95  av_cast5_crypt2(cs, rpt2[0], rct2[0], 2, temp, 0);
96  memcpy(temp, iv, 8);
97  av_cast5_crypt2(cs, rpt2[0], rpt2[0], 2, temp, 1);
98  for (i = 0; i < 16; i++) {
99  if (rct2[0][i] != rpt2[0][i]) {
100  av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct2[0][i], rpt2[0][i]);
101  err = 1;
102  }
103  }
104  }
105  av_free(cs);
106  return err;
107 }
av_cast5_alloc
struct AVCAST5 * av_cast5_alloc(void)
Allocate an AVCAST5 context To free the struct: av_free(ptr)
Definition: cast5.c:455
AVCAST5
Definition: cast5.c:75
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:500
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:29
NULL
#define NULL
Definition: coverity.c:32
log.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
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:460
temp
else temp
Definition: vf_mcdeint.c:263
mem.h
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
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:480