Branch data 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 : :
59 : : #define OPENSSL_FIPSAPI
60 : :
61 : : #include <stdio.h>
62 : : #include <stdlib.h>
63 : : #include <string.h>
64 : : #include "cryptlib.h"
65 : : #include <openssl/hmac.h>
66 : :
67 : 17814 : int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
68 : : const EVP_MD *md, ENGINE *impl)
69 : : {
70 : 17814 : int i,j,reset=0;
71 : : unsigned char pad[HMAC_MAX_MD_CBLOCK];
72 : :
73 [ + - ]: 17814 : if (md != NULL)
74 : : {
75 : 17814 : reset=1;
76 : 17814 : ctx->md=md;
77 : : }
78 : : else
79 : 0 : md=ctx->md;
80 : :
81 [ + - ]: 17814 : if (key != NULL)
82 : : {
83 : 17814 : reset=1;
84 : 17814 : j=M_EVP_MD_block_size(md);
85 [ - + ]: 17814 : OPENSSL_assert(j <= (int)sizeof(ctx->key));
86 [ - + ]: 17814 : if (j < len)
87 : : {
88 [ # # ]: 0 : if (!EVP_DigestInit_ex(&ctx->md_ctx,md, impl))
89 : : goto err;
90 [ # # ]: 0 : if (!EVP_DigestUpdate(&ctx->md_ctx,key,len))
91 : : goto err;
92 [ # # ]: 0 : if (!EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
93 : : &ctx->key_length))
94 : : goto err;
95 : : }
96 : : else
97 : : {
98 [ - + ]: 17814 : OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key));
99 : 17814 : memcpy(ctx->key,key,len);
100 : 17814 : ctx->key_length=len;
101 : : }
102 [ + - ]: 17814 : if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
103 : 17814 : memset(&ctx->key[ctx->key_length], 0,
104 : 17814 : HMAC_MAX_MD_CBLOCK - ctx->key_length);
105 : : }
106 : :
107 [ + - ]: 17814 : if (reset)
108 : : {
109 [ + + ]: 2298006 : for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
110 : 2280192 : pad[i]=0x36^ctx->key[i];
111 [ + - ]: 17814 : if (!EVP_DigestInit_ex(&ctx->i_ctx,md, impl))
112 : : goto err;
113 [ + - ]: 17814 : if (!EVP_DigestUpdate(&ctx->i_ctx,pad,M_EVP_MD_block_size(md)))
114 : : goto err;
115 : :
116 [ + + ]: 2298006 : for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
117 : 2280192 : pad[i]=0x5c^ctx->key[i];
118 [ + - ]: 17814 : if (!EVP_DigestInit_ex(&ctx->o_ctx,md, impl))
119 : : goto err;
120 [ + - ]: 17814 : if (!EVP_DigestUpdate(&ctx->o_ctx,pad,M_EVP_MD_block_size(md)))
121 : : goto err;
122 : : }
123 [ - + ]: 17814 : if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx))
124 : : goto err;
125 : : return 1;
126 : : err:
127 : : return 0;
128 : : }
129 : :
130 : 4 : int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
131 : : {
132 [ + - ]: 4 : if(key && md)
133 : 4 : HMAC_CTX_init(ctx);
134 : 4 : return HMAC_Init_ex(ctx,key,len,md, NULL);
135 : : }
136 : :
137 : 275149 : int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
138 : : {
139 : 275149 : return EVP_DigestUpdate(&ctx->md_ctx,data,len);
140 : : }
141 : :
142 : 147494 : int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
143 : : {
144 : : unsigned int i;
145 : : unsigned char buf[EVP_MAX_MD_SIZE];
146 : :
147 [ + - ]: 147494 : if (!EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i))
148 : : goto err;
149 [ + - ]: 147494 : if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx))
150 : : goto err;
151 [ + - ]: 147494 : if (!EVP_DigestUpdate(&ctx->md_ctx,buf,i))
152 : : goto err;
153 [ - + ]: 147494 : if (!EVP_DigestFinal_ex(&ctx->md_ctx,md,len))
154 : : goto err;
155 : : return 1;
156 : : err:
157 : : return 0;
158 : : }
159 : :
160 : 689439 : void HMAC_CTX_init(HMAC_CTX *ctx)
161 : : {
162 : 689439 : EVP_MD_CTX_init(&ctx->i_ctx);
163 : 689439 : EVP_MD_CTX_init(&ctx->o_ctx);
164 : 689439 : EVP_MD_CTX_init(&ctx->md_ctx);
165 : 689439 : }
166 : :
167 : 248261 : int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
168 : : {
169 : 248261 : HMAC_CTX_init(dctx);
170 [ + - ]: 248261 : if (!EVP_MD_CTX_copy_ex(&dctx->i_ctx, &sctx->i_ctx))
171 : : goto err;
172 [ + - ]: 248261 : if (!EVP_MD_CTX_copy_ex(&dctx->o_ctx, &sctx->o_ctx))
173 : : goto err;
174 [ + - ]: 248261 : if (!EVP_MD_CTX_copy_ex(&dctx->md_ctx, &sctx->md_ctx))
175 : : goto err;
176 : 248261 : memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
177 : 248261 : dctx->key_length = sctx->key_length;
178 : 248261 : dctx->md = sctx->md;
179 : 248261 : return 1;
180 : : err:
181 : : return 0;
182 : : }
183 : :
184 : 283043 : void HMAC_CTX_cleanup(HMAC_CTX *ctx)
185 : : {
186 : 283043 : EVP_MD_CTX_cleanup(&ctx->i_ctx);
187 : 283043 : EVP_MD_CTX_cleanup(&ctx->o_ctx);
188 : 283043 : EVP_MD_CTX_cleanup(&ctx->md_ctx);
189 : : memset(ctx,0,sizeof *ctx);
190 : 283043 : }
191 : :
192 : 4 : unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
193 : : const unsigned char *d, size_t n, unsigned char *md,
194 : : unsigned int *md_len)
195 : : {
196 : : HMAC_CTX c;
197 : : static unsigned char m[EVP_MAX_MD_SIZE];
198 : :
199 [ + - ]: 4 : if (md == NULL) md=m;
200 : 4 : HMAC_CTX_init(&c);
201 [ + - ]: 4 : if (!HMAC_Init(&c,key,key_len,evp_md))
202 : : goto err;
203 [ + - ]: 4 : if (!HMAC_Update(&c,d,n))
204 : : goto err;
205 [ + - ]: 4 : if (!HMAC_Final(&c,md,md_len))
206 : : goto err;
207 : 4 : HMAC_CTX_cleanup(&c);
208 : 4 : return md;
209 : : err:
210 : : return NULL;
211 : : }
212 : :
213 : 16968 : void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
214 : : {
215 : 16968 : M_EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
216 : 16968 : M_EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
217 : 16968 : M_EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
218 : 16968 : }
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