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
main(int argc,char ** argv)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 }
104