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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 "hmac.h"
62
63void HMAC_Init(ctx,key,len,md)
64HMAC_CTX *ctx;
65unsigned char *key;
66int len;
67EVP_MD *md;
68 {
69 int i,j,reset=0;
70 unsigned char pad[HMAC_MAX_MD_CBLOCK];
71
72 if (md != NULL)
73 {
74 reset=1;
75 ctx->md=md;
76 }
77 else
78 md=ctx->md;
79
80 if (key != NULL)
81 {
82 reset=1;
83 j=EVP_MD_block_size(md);
84 if (j < len)
85 {
86 EVP_DigestInit(&ctx->md_ctx,md);
87 EVP_DigestUpdate(&ctx->md_ctx,key,len);
88 EVP_DigestFinal(&(ctx->md_ctx),ctx->key,
89 &ctx->key_length);
90 }
91 else
92 {
93 memcpy(ctx->key,key,len);
94 memset(&(ctx->key[len]),0,sizeof(ctx->key)-len);
95 ctx->key_length=len;
96 }
97 }
98
99 if (reset)
100 {
101 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
102 pad[i]=0x36^ctx->key[i];
103 EVP_DigestInit(&ctx->i_ctx,md);
104 EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md));
105
106 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
107 pad[i]=0x5c^ctx->key[i];
108 EVP_DigestInit(&ctx->o_ctx,md);
109 EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md));
110 }
111
112 memcpy(&ctx->md_ctx,&ctx->i_ctx,sizeof(ctx->i_ctx));
113 }
114
115void HMAC_Update(ctx,data,len)
116HMAC_CTX *ctx;
117unsigned char *data;
118int len;
119 {
120 EVP_DigestUpdate(&(ctx->md_ctx),data,len);
121 }
122
123void HMAC_Final(ctx,md,len)
124HMAC_CTX *ctx;
125unsigned char *md;
126unsigned 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(&(ctx->md_ctx),buf,&i);
135 memcpy(&(ctx->md_ctx),&(ctx->o_ctx),sizeof(ctx->o_ctx));
136 EVP_DigestUpdate(&(ctx->md_ctx),buf,i);
137 EVP_DigestFinal(&(ctx->md_ctx),md,len);
138 }
139
140void HMAC_cleanup(ctx)
141HMAC_CTX *ctx;
142 {
143 memset(ctx,0,sizeof(HMAC_CTX));
144 }
145
146unsigned char *HMAC(evp_md,key,key_len,d,n,md,md_len)
147EVP_MD *evp_md;
148unsigned char *key;
149int key_len;
150unsigned char *d;
151int n;
152unsigned char *md;
153unsigned int *md_len;
154 {
155 HMAC_CTX c;
156 static unsigned char m[EVP_MAX_MD_SIZE];
157
158 if (md == NULL) md=m;
159 HMAC_Init(&c,key,key_len,evp_md);
160 HMAC_Update(&c,d,n);
161 HMAC_Final(&c,md,md_len);
162 HMAC_cleanup(&c);
163 return(md);
164 }
165
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