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 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())
76 {
77 /* If we have an ENGINE need to allow non FIPS */
78 if ((impl || ctx->i_ctx.engine)
79 && !(ctx->i_ctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
80 {
81 EVPerr(EVP_F_HMAC_INIT_EX, EVP_R_DISABLED_FOR_FIPS);
82 return 0;
83 }
84 /* Other algorithm blocking will be done in FIPS_cmac_init,
85 * via FIPS_hmac_init_ex().
86 */
87 if (!impl && !ctx->i_ctx.engine)
88 return FIPS_hmac_init_ex(ctx, key, len, md, NULL);
89 }
90 #endif
91
92 if (md != NULL)
93 {
94 reset=1;
95 ctx->md=md;
96 }
97 else
98 md=ctx->md;
99
100 if (key != NULL)
101 {
102 reset=1;
103 j=EVP_MD_block_size(md);
104 OPENSSL_assert(j <= (int)sizeof(ctx->key));
105 if (j < len)
106 {
107 if (!EVP_DigestInit_ex(&ctx->md_ctx,md, impl))
108 goto err;
109 if (!EVP_DigestUpdate(&ctx->md_ctx,key,len))
110 goto err;
111 if (!EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
112 &ctx->key_length))
113 goto err;
114 }
115 else
116 {
117 OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key));
118 memcpy(ctx->key,key,len);
119 ctx->key_length=len;
120 }
121 if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
122 memset(&ctx->key[ctx->key_length], 0,
123 HMAC_MAX_MD_CBLOCK - ctx->key_length);
124 }
125
126 if (reset)
127 {
128 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
129 pad[i]=0x36^ctx->key[i];
130 if (!EVP_DigestInit_ex(&ctx->i_ctx,md, impl))
131 goto err;
132 if (!EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md)))
133 goto err;
134
135 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
136 pad[i]=0x5c^ctx->key[i];
137 if (!EVP_DigestInit_ex(&ctx->o_ctx,md, impl))
138 goto err;
139 if (!EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)))
140 goto err;
141 }
142 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx))
143 goto err;
144 return 1;
145 err:
146 return 0;
147 }
148
149 int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
150 {
151 if(key && md)
152 HMAC_CTX_init(ctx);
153 return HMAC_Init_ex(ctx,key,len,md, NULL);
154 }
155
156 int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
157 {
158 #ifdef OPENSSL_FIPS
159 if (FIPS_mode() && !ctx->i_ctx.engine)
160 return FIPS_hmac_update(ctx, data, len);
161 #endif
162 return EVP_DigestUpdate(&ctx->md_ctx,data,len);
163 }
164
165 int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
166 {
167 unsigned int i;
168 unsigned char buf[EVP_MAX_MD_SIZE];
169 #ifdef OPENSSL_FIPS
170 if (FIPS_mode() && !ctx->i_ctx.engine)
171 return FIPS_hmac_final(ctx, md, len);
172 #endif
173
174 if (!EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i))
175 goto err;
176 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx))
177 goto err;
178 if (!EVP_DigestUpdate(&ctx->md_ctx,buf,i))
179 goto err;
180 if (!EVP_DigestFinal_ex(&ctx->md_ctx,md,len))
181 goto err;
182 return 1;
183 err:
184 return 0;
185 }
186
187 void HMAC_CTX_init(HMAC_CTX *ctx)
188 {
189 EVP_MD_CTX_init(&ctx->i_ctx);
190 EVP_MD_CTX_init(&ctx->o_ctx);
191 EVP_MD_CTX_init(&ctx->md_ctx);
192 }
193
194 int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
195 {
196 if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
197 goto err;
198 if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
199 goto err;
200 if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
201 goto err;
202 memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
203 dctx->key_length = sctx->key_length;
204 dctx->md = sctx->md;
205 return 1;
206 err:
207 return 0;
208 }
209
210 void HMAC_CTX_cleanup(HMAC_CTX *ctx)
211 {
212 #ifdef OPENSSL_FIPS
213 if (FIPS_mode() && !ctx->i_ctx.engine)
214 {
215 FIPS_hmac_ctx_cleanup(ctx);
216 return;
217 }
218 #endif
219 EVP_MD_CTX_cleanup(&ctx->i_ctx);
220 EVP_MD_CTX_cleanup(&ctx->o_ctx);
221 EVP_MD_CTX_cleanup(&ctx->md_ctx);
222 memset(ctx,0,sizeof *ctx);
223 }
224
225 unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
226 const unsigned char *d, size_t n, unsigned char *md,
227 unsigned int *md_len)
228 {
229 HMAC_CTX c;
230 static unsigned char m[EVP_MAX_MD_SIZE];
231
232 if (md == NULL) md=m;
233 HMAC_CTX_init(&c);
234 if (!HMAC_Init(&c,key,key_len,evp_md))
235 goto err;
236 if (!HMAC_Update(&c,d,n))
237 goto err;
238 if (!HMAC_Final(&c,md,md_len))
239 goto err;
240 HMAC_CTX_cleanup(&c);
241 return md;
242 err:
243 return NULL;
244 }
245
246 void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
247 {
248 EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
249 EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
250 EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
251 }