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58964a49 RE |
1 | /* crypto/hmac/hmac.c */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * All rights reserved. | |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 8 | * |
58964a49 RE |
9 | * This library is free for commercial and non-commercial use as long as |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 15 | * |
58964a49 RE |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 22 | * |
58964a49 RE |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
58964a49 RE |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
0f113f3e | 52 | * |
58964a49 RE |
53 | * The licence and distribution terms for any publically available version or |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
6dff52e8 | 58 | |
58964a49 RE |
59 | #include <stdio.h> |
60 | #include <stdlib.h> | |
61 | #include <string.h> | |
b39fc560 | 62 | #include "internal/cryptlib.h" |
25a66ee3 | 63 | #include <openssl/hmac.h> |
3f43aecc | 64 | #include "hmac_lcl.h" |
58964a49 | 65 | |
6343829a | 66 | int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, |
0f113f3e MC |
67 | const EVP_MD *md, ENGINE *impl) |
68 | { | |
69 | int i, j, reset = 0; | |
70 | unsigned char pad[HMAC_MAX_MD_CBLOCK]; | |
71 | ||
4b464e7b MC |
72 | /* If we are changing MD then we must have a key */ |
73 | if (md != NULL && md != ctx->md && (key == NULL || len < 0)) | |
74 | return 0; | |
75 | ||
0f113f3e MC |
76 | if (md != NULL) { |
77 | reset = 1; | |
78 | ctx->md = md; | |
61986d32 | 79 | } else if (ctx->md) { |
0f113f3e | 80 | md = ctx->md; |
e2095c65 MC |
81 | } else { |
82 | return 0; | |
83 | } | |
84 | ||
0f113f3e MC |
85 | if (key != NULL) { |
86 | reset = 1; | |
fa0c23de | 87 | j = EVP_MD_block_size(md); |
0f113f3e MC |
88 | OPENSSL_assert(j <= (int)sizeof(ctx->key)); |
89 | if (j < len) { | |
fa0c23de | 90 | if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl)) |
0f113f3e | 91 | goto err; |
fa0c23de | 92 | if (!EVP_DigestUpdate(ctx->md_ctx, key, len)) |
0f113f3e | 93 | goto err; |
fa0c23de | 94 | if (!EVP_DigestFinal_ex(ctx->md_ctx, ctx->key, |
0f113f3e MC |
95 | &ctx->key_length)) |
96 | goto err; | |
97 | } else { | |
61986d32 | 98 | if (len < 0 || len > (int)sizeof(ctx->key)) |
c62e94d8 | 99 | return 0; |
0f113f3e MC |
100 | memcpy(ctx->key, key, len); |
101 | ctx->key_length = len; | |
102 | } | |
103 | if (ctx->key_length != HMAC_MAX_MD_CBLOCK) | |
104 | memset(&ctx->key[ctx->key_length], 0, | |
105 | HMAC_MAX_MD_CBLOCK - ctx->key_length); | |
106 | } | |
107 | ||
108 | if (reset) { | |
109 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) | |
110 | pad[i] = 0x36 ^ ctx->key[i]; | |
fa0c23de | 111 | if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl)) |
0f113f3e | 112 | goto err; |
fa0c23de | 113 | if (!EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md))) |
0f113f3e MC |
114 | goto err; |
115 | ||
116 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) | |
117 | pad[i] = 0x5c ^ ctx->key[i]; | |
fa0c23de | 118 | if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl)) |
0f113f3e | 119 | goto err; |
fa0c23de | 120 | if (!EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md))) |
0f113f3e MC |
121 | goto err; |
122 | } | |
fa0c23de | 123 | if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx)) |
0f113f3e MC |
124 | goto err; |
125 | return 1; | |
126 | err: | |
127 | return 0; | |
128 | } | |
58964a49 | 129 | |
00a5a74b | 130 | #ifndef OPENSSL_NO_DEPRECATED |
6343829a | 131 | int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) |
0f113f3e MC |
132 | { |
133 | if (key && md) | |
134 | HMAC_CTX_init(ctx); | |
135 | return HMAC_Init_ex(ctx, key, len, md, NULL); | |
136 | } | |
00a5a74b | 137 | #endif |
ff3fa48f | 138 | |
87d52468 | 139 | int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) |
0f113f3e | 140 | { |
4b464e7b | 141 | if (!ctx->md) |
e2095c65 | 142 | return 0; |
fa0c23de | 143 | return EVP_DigestUpdate(ctx->md_ctx, data, len); |
0f113f3e | 144 | } |
58964a49 | 145 | |
87d52468 | 146 | int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) |
0f113f3e MC |
147 | { |
148 | unsigned int i; | |
149 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
150 | ||
4b464e7b | 151 | if (!ctx->md) |
e2095c65 MC |
152 | goto err; |
153 | ||
fa0c23de | 154 | if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i)) |
0f113f3e | 155 | goto err; |
fa0c23de | 156 | if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx)) |
0f113f3e | 157 | goto err; |
fa0c23de | 158 | if (!EVP_DigestUpdate(ctx->md_ctx, buf, i)) |
0f113f3e | 159 | goto err; |
fa0c23de | 160 | if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len)) |
0f113f3e MC |
161 | goto err; |
162 | return 1; | |
163 | err: | |
164 | return 0; | |
165 | } | |
dbad1690 | 166 | |
3f43aecc RL |
167 | size_t HMAC_size(HMAC_CTX *ctx) |
168 | { | |
169 | return EVP_MD_size((ctx)->md); | |
170 | } | |
171 | ||
172 | HMAC_CTX *HMAC_CTX_new(void) | |
173 | { | |
174 | HMAC_CTX *ctx = (HMAC_CTX *)OPENSSL_zalloc(sizeof(HMAC_CTX)); | |
175 | if (ctx) | |
dc0099e1 | 176 | if (!HMAC_CTX_reset(ctx)) { |
3f43aecc RL |
177 | HMAC_CTX_free(ctx); |
178 | ctx = NULL; | |
179 | } | |
180 | return ctx; | |
181 | } | |
182 | ||
32fd54a9 RL |
183 | static void hmac_ctx_cleanup(HMAC_CTX *ctx) |
184 | { | |
bfb0641f RL |
185 | EVP_MD_CTX_reset(ctx->i_ctx); |
186 | EVP_MD_CTX_reset(ctx->o_ctx); | |
187 | EVP_MD_CTX_reset(ctx->md_ctx); | |
32fd54a9 RL |
188 | ctx->md = NULL; |
189 | ctx->key_length = 0; | |
190 | memset(ctx->key, 0, sizeof(HMAC_MAX_MD_CBLOCK)); | |
191 | } | |
192 | ||
3f43aecc RL |
193 | void HMAC_CTX_free(HMAC_CTX *ctx) |
194 | { | |
195 | if (ctx != NULL) { | |
32fd54a9 | 196 | hmac_ctx_cleanup(ctx); |
bfb0641f RL |
197 | EVP_MD_CTX_free(ctx->i_ctx); |
198 | EVP_MD_CTX_free(ctx->o_ctx); | |
199 | EVP_MD_CTX_free(ctx->md_ctx); | |
3f43aecc RL |
200 | OPENSSL_free(ctx); |
201 | } | |
202 | } | |
203 | ||
dc0099e1 | 204 | int HMAC_CTX_reset(HMAC_CTX *ctx) |
0f113f3e | 205 | { |
32fd54a9 | 206 | hmac_ctx_cleanup(ctx); |
fa0c23de | 207 | if (ctx->i_ctx == NULL) |
bfb0641f | 208 | ctx->i_ctx = EVP_MD_CTX_new(); |
fa0c23de RL |
209 | if (ctx->i_ctx == NULL) |
210 | goto err; | |
211 | if (ctx->o_ctx == NULL) | |
bfb0641f | 212 | ctx->o_ctx = EVP_MD_CTX_new(); |
fa0c23de RL |
213 | if (ctx->o_ctx == NULL) |
214 | goto err; | |
215 | if (ctx->md_ctx == NULL) | |
bfb0641f | 216 | ctx->md_ctx = EVP_MD_CTX_new(); |
fa0c23de RL |
217 | if (ctx->md_ctx == NULL) |
218 | goto err; | |
e2095c65 | 219 | ctx->md = NULL; |
fa0c23de RL |
220 | return 1; |
221 | err: | |
32fd54a9 | 222 | hmac_ctx_cleanup(ctx); |
fa0c23de | 223 | return 0; |
0f113f3e | 224 | } |
58964a49 | 225 | |
87d52468 | 226 | int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) |
0f113f3e | 227 | { |
fa0c23de RL |
228 | if (!HMAC_CTX_init(dctx)) |
229 | goto err; | |
230 | if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx)) | |
0f113f3e | 231 | goto err; |
fa0c23de | 232 | if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx)) |
0f113f3e | 233 | goto err; |
fa0c23de | 234 | if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx)) |
0f113f3e | 235 | goto err; |
4b464e7b MC |
236 | memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); |
237 | dctx->key_length = sctx->key_length; | |
0f113f3e MC |
238 | dctx->md = sctx->md; |
239 | return 1; | |
240 | err: | |
32fd54a9 | 241 | hmac_ctx_cleanup(dctx); |
0f113f3e MC |
242 | return 0; |
243 | } | |
74633553 | 244 | |
6343829a | 245 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, |
0f113f3e MC |
246 | const unsigned char *d, size_t n, unsigned char *md, |
247 | unsigned int *md_len) | |
248 | { | |
3f43aecc | 249 | HMAC_CTX *c = NULL; |
0f113f3e MC |
250 | static unsigned char m[EVP_MAX_MD_SIZE]; |
251 | ||
252 | if (md == NULL) | |
253 | md = m; | |
3f43aecc RL |
254 | if ((c = HMAC_CTX_new()) == NULL) |
255 | goto err; | |
256 | if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL)) | |
0f113f3e | 257 | goto err; |
3f43aecc | 258 | if (!HMAC_Update(c, d, n)) |
0f113f3e | 259 | goto err; |
3f43aecc | 260 | if (!HMAC_Final(c, md, md_len)) |
0f113f3e | 261 | goto err; |
3f43aecc | 262 | HMAC_CTX_free(c); |
0f113f3e MC |
263 | return md; |
264 | err: | |
3f43aecc | 265 | HMAC_CTX_free(c); |
0f113f3e MC |
266 | return NULL; |
267 | } | |
58964a49 | 268 | |
e92f9f45 | 269 | void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) |
0f113f3e | 270 | { |
fa0c23de RL |
271 | EVP_MD_CTX_set_flags(ctx->i_ctx, flags); |
272 | EVP_MD_CTX_set_flags(ctx->o_ctx, flags); | |
273 | EVP_MD_CTX_set_flags(ctx->md_ctx, flags); | |
0f113f3e | 274 | } |