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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. | |
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> | |
54a656ef | 61 | #include "cryptlib.h" |
25a66ee3 | 62 | #include <openssl/hmac.h> |
58964a49 | 63 | |
5e4430e7 | 64 | void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, size_t len, |
de941e28 | 65 | const EVP_MD *md, ENGINE *impl) |
58964a49 RE |
66 | { |
67 | int i,j,reset=0; | |
68 | unsigned char pad[HMAC_MAX_MD_CBLOCK]; | |
69 | ||
70 | if (md != NULL) | |
71 | { | |
72 | reset=1; | |
73 | ctx->md=md; | |
74 | } | |
75 | else | |
76 | md=ctx->md; | |
77 | ||
78 | if (key != NULL) | |
79 | { | |
80 | reset=1; | |
81 | j=EVP_MD_block_size(md); | |
27545970 | 82 | OPENSSL_assert(j <= (int)sizeof(ctx->key)); |
58964a49 RE |
83 | if (j < len) |
84 | { | |
de941e28 | 85 | EVP_DigestInit_ex(&ctx->md_ctx,md, impl); |
58964a49 | 86 | EVP_DigestUpdate(&ctx->md_ctx,key,len); |
20d2186c | 87 | EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, |
58964a49 RE |
88 | &ctx->key_length); |
89 | } | |
90 | else | |
91 | { | |
f10725a6 | 92 | OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key)); |
58964a49 | 93 | memcpy(ctx->key,key,len); |
58964a49 RE |
94 | ctx->key_length=len; |
95 | } | |
b475baff DSH |
96 | if(ctx->key_length != HMAC_MAX_MD_CBLOCK) |
97 | memset(&ctx->key[ctx->key_length], 0, | |
98 | HMAC_MAX_MD_CBLOCK - ctx->key_length); | |
58964a49 RE |
99 | } |
100 | ||
101 | if (reset) | |
102 | { | |
103 | for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) | |
104 | pad[i]=0x36^ctx->key[i]; | |
de941e28 | 105 | EVP_DigestInit_ex(&ctx->i_ctx,md, impl); |
58964a49 RE |
106 | EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md)); |
107 | ||
108 | for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) | |
109 | pad[i]=0x5c^ctx->key[i]; | |
de941e28 | 110 | EVP_DigestInit_ex(&ctx->o_ctx,md, impl); |
58964a49 RE |
111 | EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)); |
112 | } | |
20d2186c | 113 | EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx); |
58964a49 RE |
114 | } |
115 | ||
5e4430e7 | 116 | void HMAC_Init(HMAC_CTX *ctx, const void *key, size_t len, const EVP_MD *md) |
ff3fa48f BL |
117 | { |
118 | if(key && md) | |
119 | HMAC_CTX_init(ctx); | |
de941e28 | 120 | HMAC_Init_ex(ctx,key,len,md, NULL); |
ff3fa48f BL |
121 | } |
122 | ||
9e0aad9f | 123 | void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) |
58964a49 | 124 | { |
dbad1690 | 125 | EVP_DigestUpdate(&ctx->md_ctx,data,len); |
58964a49 RE |
126 | } |
127 | ||
6b691a5c | 128 | void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) |
58964a49 RE |
129 | { |
130 | int j; | |
131 | unsigned int i; | |
132 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
133 | ||
134 | j=EVP_MD_block_size(ctx->md); | |
135 | ||
20d2186c DSH |
136 | EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i); |
137 | EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx); | |
dbad1690 | 138 | EVP_DigestUpdate(&ctx->md_ctx,buf,i); |
20d2186c | 139 | EVP_DigestFinal_ex(&ctx->md_ctx,md,len); |
dbad1690 BL |
140 | } |
141 | ||
142 | void HMAC_CTX_init(HMAC_CTX *ctx) | |
143 | { | |
144 | EVP_MD_CTX_init(&ctx->i_ctx); | |
145 | EVP_MD_CTX_init(&ctx->o_ctx); | |
146 | EVP_MD_CTX_init(&ctx->md_ctx); | |
58964a49 RE |
147 | } |
148 | ||
74633553 DSH |
149 | void HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) |
150 | { | |
151 | EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx); | |
152 | EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx); | |
153 | EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx); | |
154 | memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); | |
155 | dctx->key_length = sctx->key_length; | |
156 | dctx->md = sctx->md; | |
157 | } | |
158 | ||
dbad1690 | 159 | void HMAC_CTX_cleanup(HMAC_CTX *ctx) |
58964a49 | 160 | { |
dbad1690 BL |
161 | EVP_MD_CTX_cleanup(&ctx->i_ctx); |
162 | EVP_MD_CTX_cleanup(&ctx->o_ctx); | |
163 | EVP_MD_CTX_cleanup(&ctx->md_ctx); | |
164 | memset(ctx,0,sizeof *ctx); | |
58964a49 RE |
165 | } |
166 | ||
5e4430e7 | 167 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, size_t key_len, |
9e0aad9f | 168 | const unsigned char *d, size_t n, unsigned char *md, |
72fbe87d | 169 | unsigned int *md_len) |
58964a49 RE |
170 | { |
171 | HMAC_CTX c; | |
172 | static unsigned char m[EVP_MAX_MD_SIZE]; | |
173 | ||
174 | if (md == NULL) md=m; | |
dbad1690 | 175 | HMAC_CTX_init(&c); |
58964a49 RE |
176 | HMAC_Init(&c,key,key_len,evp_md); |
177 | HMAC_Update(&c,d,n); | |
178 | HMAC_Final(&c,md,md_len); | |
dbad1690 | 179 | HMAC_CTX_cleanup(&c); |
58964a49 RE |
180 | return(md); |
181 | } | |
182 |