avutil: Add av_cold attributes to init functions missing them
[libav.git] / libavutil / hmac.c
1 /*
2 * Copyright (C) 2012 Martin Storsjo
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <string.h>
22
23 #include "attributes.h"
24 #include "hmac.h"
25 #include "md5.h"
26 #include "sha.h"
27 #include "mem.h"
28
29 #define MAX_HASHLEN 20
30 #define MAX_BLOCKLEN 64
31
32 struct AVHMAC {
33 void *hash;
34 int blocklen, hashlen;
35 void (*final)(void*, uint8_t*);
36 void (*update)(void*, const uint8_t*, int len);
37 void (*init)(void*);
38 uint8_t key[MAX_BLOCKLEN];
39 int keylen;
40 };
41
42 static av_cold void sha1_init(void *ctx)
43 {
44 av_sha_init(ctx, 160);
45 }
46
47 AVHMAC *av_hmac_alloc(enum AVHMACType type)
48 {
49 AVHMAC *c = av_mallocz(sizeof(*c));
50 if (!c)
51 return NULL;
52 switch (type) {
53 case AV_HMAC_MD5:
54 c->blocklen = 64;
55 c->hashlen = 16;
56 c->init = av_md5_init;
57 c->update = av_md5_update;
58 c->final = av_md5_final;
59 c->hash = av_md5_alloc();
60 break;
61 case AV_HMAC_SHA1:
62 c->blocklen = 64;
63 c->hashlen = 20;
64 c->init = sha1_init;
65 c->update = av_sha_update;
66 c->final = av_sha_final;
67 c->hash = av_sha_alloc();
68 break;
69 default:
70 av_free(c);
71 return NULL;
72 }
73 if (!c->hash) {
74 av_free(c);
75 return NULL;
76 }
77 return c;
78 }
79
80 void av_hmac_free(AVHMAC *c)
81 {
82 if (!c)
83 return;
84 av_free(c->hash);
85 av_free(c);
86 }
87
88 void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
89 {
90 int i;
91 uint8_t block[MAX_BLOCKLEN];
92 if (keylen > c->blocklen) {
93 c->init(c->hash);
94 c->update(c->hash, key, keylen);
95 c->final(c->hash, c->key);
96 c->keylen = c->hashlen;
97 } else {
98 memcpy(c->key, key, keylen);
99 c->keylen = keylen;
100 }
101 c->init(c->hash);
102 for (i = 0; i < c->keylen; i++)
103 block[i] = c->key[i] ^ 0x36;
104 for (i = c->keylen; i < c->blocklen; i++)
105 block[i] = 0x36;
106 c->update(c->hash, block, c->blocklen);
107 }
108
109 void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
110 {
111 c->update(c->hash, data, len);
112 }
113
114 int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
115 {
116 uint8_t block[MAX_BLOCKLEN];
117 int i;
118 if (outlen < c->hashlen)
119 return AVERROR(EINVAL);
120 c->final(c->hash, out);
121 c->init(c->hash);
122 for (i = 0; i < c->keylen; i++)
123 block[i] = c->key[i] ^ 0x5C;
124 for (i = c->keylen; i < c->blocklen; i++)
125 block[i] = 0x5C;
126 c->update(c->hash, block, c->blocklen);
127 c->update(c->hash, out, c->hashlen);
128 c->final(c->hash, out);
129 return c->hashlen;
130 }
131
132 int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
133 const uint8_t *key, unsigned int keylen,
134 uint8_t *out, unsigned int outlen)
135 {
136 av_hmac_init(c, key, keylen);
137 av_hmac_update(c, data, len);
138 return av_hmac_final(c, out, outlen);
139 }
140
141 #ifdef TEST
142 #include <stdio.h>
143
144 static void test(AVHMAC *hmac, const uint8_t *key, int keylen,
145 const uint8_t *data, int datalen)
146 {
147 uint8_t buf[MAX_HASHLEN];
148 int out, i;
149 // Some of the test vectors are strings, where sizeof() includes the
150 // trailing null byte - remove that.
151 if (!key[keylen - 1])
152 keylen--;
153 if (!data[datalen - 1])
154 datalen--;
155 out = av_hmac_calc(hmac, data, datalen, key, keylen, buf, sizeof(buf));
156 for (i = 0; i < out; i++)
157 printf("%02x", buf[i]);
158 printf("\n");
159 }
160
161 int main(void)
162 {
163 uint8_t key1[16], key3[16], data3[50], key4[63], key5[64], key6[65];
164 const uint8_t key2[] = "Jefe";
165 const uint8_t data1[] = "Hi There";
166 const uint8_t data2[] = "what do ya want for nothing?";
167 AVHMAC *hmac = av_hmac_alloc(AV_HMAC_MD5);
168 if (!hmac)
169 return 1;
170 memset(key1, 0x0b, sizeof(key1));
171 memset(key3, 0xaa, sizeof(key3));
172 memset(key4, 0x44, sizeof(key4));
173 memset(key5, 0x55, sizeof(key5));
174 memset(key6, 0x66, sizeof(key6));
175 memset(data3, 0xdd, sizeof(data3));
176 // RFC 2104 test vectors
177 test(hmac, key1, sizeof(key1), data1, sizeof(data1));
178 test(hmac, key2, sizeof(key2), data2, sizeof(data2));
179 test(hmac, key3, sizeof(key3), data3, sizeof(data3));
180 // Additional tests, to test cases where the key is too long
181 test(hmac, key4, sizeof(key4), data1, sizeof(data1));
182 test(hmac, key5, sizeof(key5), data2, sizeof(data2));
183 test(hmac, key6, sizeof(key6), data3, sizeof(data3));
184 av_hmac_free(hmac);
185 return 0;
186 }
187 #endif /* TEST */