Line data Source code
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.
8 : *
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).
15 : *
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.
22 : *
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 :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
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.
52 : *
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 : */
58 : #include <stdio.h>
59 : #include <stdlib.h>
60 : #include <string.h>
61 : #include "cryptlib.h"
62 : #include <openssl/hmac.h>
63 :
64 : #ifdef OPENSSL_FIPS
65 : # include <openssl/fips.h>
66 : #endif
67 :
68 4042 : int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
69 : const EVP_MD *md, ENGINE *impl)
70 : {
71 : int i, j, reset = 0;
72 : unsigned char pad[HMAC_MAX_MD_CBLOCK];
73 :
74 : #ifdef OPENSSL_FIPS
75 : /* If FIPS mode switch to approved implementation if possible */
76 : if (FIPS_mode()) {
77 : const EVP_MD *fipsmd;
78 : if (md) {
79 : fipsmd = FIPS_get_digestbynid(EVP_MD_type(md));
80 : if (fipsmd)
81 : md = fipsmd;
82 : }
83 : }
84 :
85 : if (FIPS_mode()) {
86 : /* If we have an ENGINE need to allow non FIPS */
87 : if ((impl || ctx->i_ctx.engine)
88 : && !(ctx->i_ctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) {
89 : EVPerr(EVP_F_HMAC_INIT_EX, EVP_R_DISABLED_FOR_FIPS);
90 : return 0;
91 : }
92 : /*
93 : * Other algorithm blocking will be done in FIPS_cmac_init, via
94 : * FIPS_hmac_init_ex().
95 : */
96 : if (!impl && !ctx->i_ctx.engine)
97 : return FIPS_hmac_init_ex(ctx, key, len, md, NULL);
98 : }
99 : #endif
100 : /* If we are changing MD then we must have a key */
101 4042 : if (md != NULL && md != ctx->md && (key == NULL || len < 0))
102 : return 0;
103 :
104 4042 : if (md != NULL) {
105 : reset = 1;
106 4042 : ctx->md = md;
107 0 : } else if (ctx->md) {
108 : md = ctx->md;
109 : } else {
110 : return 0;
111 : }
112 :
113 4042 : if (key != NULL) {
114 : reset = 1;
115 4042 : j = EVP_MD_block_size(md);
116 4042 : OPENSSL_assert(j <= (int)sizeof(ctx->key));
117 4042 : if (j < len) {
118 0 : if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl))
119 : goto err;
120 0 : if (!EVP_DigestUpdate(&ctx->md_ctx, key, len))
121 : goto err;
122 0 : if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key,
123 : &ctx->key_length))
124 : goto err;
125 : } else {
126 4042 : if (len < 0 || len > (int)sizeof(ctx->key))
127 : return 0;
128 4042 : memcpy(ctx->key, key, len);
129 4042 : ctx->key_length = len;
130 : }
131 4042 : if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
132 4042 : memset(&ctx->key[ctx->key_length], 0,
133 4042 : HMAC_MAX_MD_CBLOCK - ctx->key_length);
134 : }
135 :
136 4042 : if (reset) {
137 517376 : for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
138 517376 : pad[i] = 0x36 ^ ctx->key[i];
139 4042 : if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl))
140 : goto err;
141 4042 : if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md)))
142 : goto err;
143 :
144 517376 : for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
145 517376 : pad[i] = 0x5c ^ ctx->key[i];
146 4042 : if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl))
147 : goto err;
148 4042 : if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md)))
149 : goto err;
150 : }
151 4042 : if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx))
152 : goto err;
153 : return 1;
154 : err:
155 : return 0;
156 : }
157 :
158 0 : int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
159 : {
160 0 : if (key && md)
161 0 : HMAC_CTX_init(ctx);
162 0 : return HMAC_Init_ex(ctx, key, len, md, NULL);
163 : }
164 :
165 27586 : int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
166 : {
167 : #ifdef OPENSSL_FIPS
168 : if (FIPS_mode() && !ctx->i_ctx.engine)
169 : return FIPS_hmac_update(ctx, data, len);
170 : #endif
171 27586 : if (!ctx->md)
172 : return 0;
173 :
174 27586 : return EVP_DigestUpdate(&ctx->md_ctx, data, len);
175 : }
176 :
177 10665 : int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
178 : {
179 : unsigned int i;
180 : unsigned char buf[EVP_MAX_MD_SIZE];
181 : #ifdef OPENSSL_FIPS
182 : if (FIPS_mode() && !ctx->i_ctx.engine)
183 : return FIPS_hmac_final(ctx, md, len);
184 : #endif
185 :
186 10665 : if (!ctx->md)
187 : goto err;
188 :
189 10665 : if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i))
190 : goto err;
191 10665 : if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx))
192 : goto err;
193 10665 : if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i))
194 : goto err;
195 10665 : if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len))
196 : goto err;
197 : return 1;
198 : err:
199 : return 0;
200 : }
201 :
202 48909 : void HMAC_CTX_init(HMAC_CTX *ctx)
203 : {
204 48909 : EVP_MD_CTX_init(&ctx->i_ctx);
205 48909 : EVP_MD_CTX_init(&ctx->o_ctx);
206 48909 : EVP_MD_CTX_init(&ctx->md_ctx);
207 48909 : ctx->md = NULL;
208 48909 : }
209 :
210 20596 : int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
211 : {
212 20596 : if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
213 : goto err;
214 20596 : if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
215 : goto err;
216 20596 : if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
217 : goto err;
218 20596 : memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
219 20596 : dctx->key_length = sctx->key_length;
220 20596 : dctx->md = sctx->md;
221 20596 : return 1;
222 : err:
223 : return 0;
224 : }
225 :
226 28313 : void HMAC_CTX_cleanup(HMAC_CTX *ctx)
227 : {
228 : #ifdef OPENSSL_FIPS
229 : if (FIPS_mode() && !ctx->i_ctx.engine) {
230 : FIPS_hmac_ctx_cleanup(ctx);
231 : return;
232 : }
233 : #endif
234 28313 : EVP_MD_CTX_cleanup(&ctx->i_ctx);
235 28313 : EVP_MD_CTX_cleanup(&ctx->o_ctx);
236 28313 : EVP_MD_CTX_cleanup(&ctx->md_ctx);
237 : memset(ctx, 0, sizeof *ctx);
238 28313 : }
239 :
240 0 : unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
241 : const unsigned char *d, size_t n, unsigned char *md,
242 : unsigned int *md_len)
243 : {
244 : HMAC_CTX c;
245 : static unsigned char m[EVP_MAX_MD_SIZE];
246 :
247 0 : if (md == NULL)
248 : md = m;
249 0 : HMAC_CTX_init(&c);
250 0 : if (!HMAC_Init(&c, key, key_len, evp_md))
251 : goto err;
252 0 : if (!HMAC_Update(&c, d, n))
253 : goto err;
254 0 : if (!HMAC_Final(&c, md, md_len))
255 : goto err;
256 0 : HMAC_CTX_cleanup(&c);
257 0 : return md;
258 : err:
259 0 : HMAC_CTX_cleanup(&c);
260 0 : return NULL;
261 : }
262 :
263 3675 : void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
264 : {
265 3675 : EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
266 3675 : EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
267 3675 : EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
268 3675 : }
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