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authorcvs2svn <admin@example.com>2003-03-22 08:02:04 +0000
committercvs2svn <admin@example.com>2003-03-22 08:02:04 +0000
commitdf32a1286ae06981a79e30b678165a784696be4b (patch)
tree3d70e9a28e2db2eee8cd542ce0ce859502668178 /src/lib/libcrypto/hmac/hmac.c
parent2850ebd15c3cfddf6fb7edcd08cb6b2c6f717be9 (diff)
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diff --git a/src/lib/libcrypto/hmac/hmac.c b/src/lib/libcrypto/hmac/hmac.c
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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 <openssl/hmac.h>
62
63void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
64 const EVP_MD *md, ENGINE *impl)
65 {
66 int i,j,reset=0;
67 unsigned char pad[HMAC_MAX_MD_CBLOCK];
68
69 if (md != NULL)
70 {
71 reset=1;
72 ctx->md=md;
73 }
74 else
75 md=ctx->md;
76
77 if (key != NULL)
78 {
79 reset=1;
80 j=EVP_MD_block_size(md);
81 if (j < len)
82 {
83 EVP_DigestInit_ex(&ctx->md_ctx,md, impl);
84 EVP_DigestUpdate(&ctx->md_ctx,key,len);
85 EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
86 &ctx->key_length);
87 }
88 else
89 {
90 memcpy(ctx->key,key,len);
91 ctx->key_length=len;
92 }
93 if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
94 memset(&ctx->key[ctx->key_length], 0,
95 HMAC_MAX_MD_CBLOCK - ctx->key_length);
96 }
97
98 if (reset)
99 {
100 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
101 pad[i]=0x36^ctx->key[i];
102 EVP_DigestInit_ex(&ctx->i_ctx,md, impl);
103 EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md));
104
105 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
106 pad[i]=0x5c^ctx->key[i];
107 EVP_DigestInit_ex(&ctx->o_ctx,md, impl);
108 EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md));
109 }
110 EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx);
111 }
112
113void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
114 const EVP_MD *md)
115 {
116 if(key && md)
117 HMAC_CTX_init(ctx);
118 HMAC_Init_ex(ctx,key,len,md, NULL);
119 }
120
121void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len)
122 {
123 EVP_DigestUpdate(&ctx->md_ctx,data,len);
124 }
125
126void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
127 {
128 int j;
129 unsigned int i;
130 unsigned char buf[EVP_MAX_MD_SIZE];
131
132 j=EVP_MD_block_size(ctx->md);
133
134 EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i);
135 EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx);
136 EVP_DigestUpdate(&ctx->md_ctx,buf,i);
137 EVP_DigestFinal_ex(&ctx->md_ctx,md,len);
138 }
139
140void HMAC_CTX_init(HMAC_CTX *ctx)
141 {
142 EVP_MD_CTX_init(&ctx->i_ctx);
143 EVP_MD_CTX_init(&ctx->o_ctx);
144 EVP_MD_CTX_init(&ctx->md_ctx);
145 }
146
147void HMAC_CTX_cleanup(HMAC_CTX *ctx)
148 {
149 EVP_MD_CTX_cleanup(&ctx->i_ctx);
150 EVP_MD_CTX_cleanup(&ctx->o_ctx);
151 EVP_MD_CTX_cleanup(&ctx->md_ctx);
152 memset(ctx,0,sizeof *ctx);
153 }
154
155unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
156 const unsigned char *d, int n, unsigned char *md,
157 unsigned int *md_len)
158 {
159 HMAC_CTX c;
160 static unsigned char m[EVP_MAX_MD_SIZE];
161
162 if (md == NULL) md=m;
163 HMAC_CTX_init(&c);
164 HMAC_Init(&c,key,key_len,evp_md);
165 HMAC_Update(&c,d,n);
166 HMAC_Final(&c,md,md_len);
167 HMAC_CTX_cleanup(&c);
168 return(md);
169 }
170
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