1 /*
2 * A 32-bit implementation of the TEA algorithm
3 * Copyright (c) 2015 Vesselin Bontchev
4 *
5 * Loosely based on the implementation of David Wheeler and Roger Needham,
6 * https://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm#Reference_code
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include <stdio.h>
26
27 #include "libavutil/common.h"
28 #include "libavutil/tea.h"
29
30 #define TEA_NUM_TESTS 4
31
32 // https://github.com/logandrews/TeaCrypt/blob/master/tea/tea_test.go
33 static const uint8_t tea_test_key[TEA_NUM_TESTS][16] = {
34 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
35 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
36 },
37 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
38 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
39 },
40 { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
41 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
42 },
43 { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
44 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF
45 }
46 };
47
48 static const uint8_t tea_test_pt[TEA_NUM_TESTS][8] = {
49 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
50 { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
51 { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 },
52 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF }
53 };
54
55 static const uint8_t tea_test_ct[TEA_NUM_TESTS][8] = {
56 { 0x41, 0xEA, 0x3A, 0x0A, 0x94, 0xBA, 0xA9, 0x40 },
57 { 0x6A, 0x2F, 0x9C, 0xF3, 0xFC, 0xCF, 0x3C, 0x55 },
58 { 0xDE, 0xB1, 0xC0, 0xA2, 0x7E, 0x74, 0x5D, 0xB3 },
59 { 0x12, 0x6C, 0x6B, 0x92, 0xC0, 0x65, 0x3A, 0x3E }
60 };
61
test_tea(struct AVTEA * ctx,uint8_t * dst,const uint8_t * src,const uint8_t * ref,int len,uint8_t * iv,int dir,const char * test)62 static void test_tea(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src,
63 const uint8_t *ref, int len, uint8_t *iv, int dir,
64 const char *test)
65 {
66 av_tea_crypt(ctx, dst, src, len, iv, dir);
67 if (memcmp(dst, ref, 8*len)) {
68 int i;
69 printf("%s failed\ngot ", test);
70 for (i = 0; i < 8*len; i++)
71 printf("%02x ", dst[i]);
72 printf("\nexpected ");
73 for (i = 0; i < 8*len; i++)
74 printf("%02x ", ref[i]);
75 printf("\n");
76 exit(1);
77 }
78 }
79
main(void)80 int main(void)
81 {
82 struct AVTEA *ctx;
83 uint8_t buf[8], iv[8];
84 int i;
85 static const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld";
86 uint8_t ct[32];
87 uint8_t pl[32];
88
89 ctx = av_tea_alloc();
90 if (!ctx)
91 return 1;
92
93 for (i = 0; i < TEA_NUM_TESTS; i++) {
94 av_tea_init(ctx, tea_test_key[i], 64);
95
96 test_tea(ctx, buf, tea_test_pt[i], tea_test_ct[i], 1, NULL, 0, "encryption");
97 test_tea(ctx, buf, tea_test_ct[i], tea_test_pt[i], 1, NULL, 1, "decryption");
98
99 /* encrypt */
100 memcpy(iv, "HALLO123", 8);
101 av_tea_crypt(ctx, ct, src, 4, iv, 0);
102
103 /* decrypt into pl */
104 memcpy(iv, "HALLO123", 8);
105 test_tea(ctx, pl, ct, src, 4, iv, 1, "CBC decryption");
106
107 memcpy(iv, "HALLO123", 8);
108 test_tea(ctx, ct, ct, src, 4, iv, 1, "CBC inplace decryption");
109 }
110
111 printf("Test encryption/decryption success.\n");
112 av_free(ctx);
113
114 return 0;
115 }
116