blob: 8ec6d70406c9d6931c05929c1b5eb4d9b3713751
1 | /* |
2 | * Copyright (C) 2012 Martin Storsjo |
3 | * |
4 | * This file is part of FFmpeg. |
5 | * |
6 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 "sha512.h" |
28 | #include "mem.h" |
29 | |
30 | #define MAX_HASHLEN 64 |
31 | #define MAX_BLOCKLEN 128 |
32 | |
33 | struct AVHMAC { |
34 | void *hash; |
35 | int blocklen, hashlen; |
36 | void (*final)(void*, uint8_t*); |
37 | void (*update)(void*, const uint8_t*, int len); |
38 | void (*init)(void*); |
39 | uint8_t key[MAX_BLOCKLEN]; |
40 | int keylen; |
41 | }; |
42 | |
43 | #define DEFINE_SHA(bits) \ |
44 | static av_cold void sha ## bits ##_init(void *ctx) \ |
45 | { \ |
46 | av_sha_init(ctx, bits); \ |
47 | } |
48 | |
49 | #define DEFINE_SHA512(bits) \ |
50 | static av_cold void sha ## bits ##_init(void *ctx) \ |
51 | { \ |
52 | av_sha512_init(ctx, bits); \ |
53 | } |
54 | |
55 | DEFINE_SHA(160) |
56 | DEFINE_SHA(224) |
57 | DEFINE_SHA(256) |
58 | DEFINE_SHA512(384) |
59 | DEFINE_SHA512(512) |
60 | |
61 | AVHMAC *av_hmac_alloc(enum AVHMACType type) |
62 | { |
63 | AVHMAC *c = av_mallocz(sizeof(*c)); |
64 | if (!c) |
65 | return NULL; |
66 | switch (type) { |
67 | case AV_HMAC_MD5: |
68 | c->blocklen = 64; |
69 | c->hashlen = 16; |
70 | c->init = (void*)av_md5_init; |
71 | c->update = (void*)av_md5_update; |
72 | c->final = (void*)av_md5_final; |
73 | c->hash = av_md5_alloc(); |
74 | break; |
75 | case AV_HMAC_SHA1: |
76 | c->blocklen = 64; |
77 | c->hashlen = 20; |
78 | c->init = sha160_init; |
79 | c->update = (void*)av_sha_update; |
80 | c->final = (void*)av_sha_final; |
81 | c->hash = av_sha_alloc(); |
82 | break; |
83 | case AV_HMAC_SHA224: |
84 | c->blocklen = 64; |
85 | c->hashlen = 28; |
86 | c->init = sha224_init; |
87 | c->update = (void*)av_sha_update; |
88 | c->final = (void*)av_sha_final; |
89 | c->hash = av_sha_alloc(); |
90 | break; |
91 | case AV_HMAC_SHA256: |
92 | c->blocklen = 64; |
93 | c->hashlen = 32; |
94 | c->init = sha256_init; |
95 | c->update = (void*)av_sha_update; |
96 | c->final = (void*)av_sha_final; |
97 | c->hash = av_sha_alloc(); |
98 | break; |
99 | case AV_HMAC_SHA384: |
100 | c->blocklen = 128; |
101 | c->hashlen = 48; |
102 | c->init = sha384_init; |
103 | c->update = (void*)av_sha512_update; |
104 | c->final = (void*)av_sha512_final; |
105 | c->hash = av_sha512_alloc(); |
106 | break; |
107 | case AV_HMAC_SHA512: |
108 | c->blocklen = 128; |
109 | c->hashlen = 64; |
110 | c->init = sha512_init; |
111 | c->update = (void*)av_sha512_update; |
112 | c->final = (void*)av_sha512_final; |
113 | c->hash = av_sha512_alloc(); |
114 | break; |
115 | default: |
116 | av_free(c); |
117 | return NULL; |
118 | } |
119 | if (!c->hash) { |
120 | av_free(c); |
121 | return NULL; |
122 | } |
123 | return c; |
124 | } |
125 | |
126 | void av_hmac_free(AVHMAC *c) |
127 | { |
128 | if (!c) |
129 | return; |
130 | av_freep(&c->hash); |
131 | av_free(c); |
132 | } |
133 | |
134 | void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen) |
135 | { |
136 | int i; |
137 | uint8_t block[MAX_BLOCKLEN]; |
138 | if (keylen > c->blocklen) { |
139 | c->init(c->hash); |
140 | c->update(c->hash, key, keylen); |
141 | c->final(c->hash, c->key); |
142 | c->keylen = c->hashlen; |
143 | } else { |
144 | memcpy(c->key, key, keylen); |
145 | c->keylen = keylen; |
146 | } |
147 | c->init(c->hash); |
148 | for (i = 0; i < c->keylen; i++) |
149 | block[i] = c->key[i] ^ 0x36; |
150 | for (i = c->keylen; i < c->blocklen; i++) |
151 | block[i] = 0x36; |
152 | c->update(c->hash, block, c->blocklen); |
153 | } |
154 | |
155 | void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len) |
156 | { |
157 | c->update(c->hash, data, len); |
158 | } |
159 | |
160 | int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen) |
161 | { |
162 | uint8_t block[MAX_BLOCKLEN]; |
163 | int i; |
164 | if (outlen < c->hashlen) |
165 | return AVERROR(EINVAL); |
166 | c->final(c->hash, out); |
167 | c->init(c->hash); |
168 | for (i = 0; i < c->keylen; i++) |
169 | block[i] = c->key[i] ^ 0x5C; |
170 | for (i = c->keylen; i < c->blocklen; i++) |
171 | block[i] = 0x5C; |
172 | c->update(c->hash, block, c->blocklen); |
173 | c->update(c->hash, out, c->hashlen); |
174 | c->final(c->hash, out); |
175 | return c->hashlen; |
176 | } |
177 | |
178 | int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len, |
179 | const uint8_t *key, unsigned int keylen, |
180 | uint8_t *out, unsigned int outlen) |
181 | { |
182 | av_hmac_init(c, key, keylen); |
183 | av_hmac_update(c, data, len); |
184 | return av_hmac_final(c, out, outlen); |
185 | } |
186 |