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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#include "cryptlib.h"
63
64void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
65 const EVP_MD *md, ENGINE *impl)
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#ifdef OPENSSL_FIPS
81 if (FIPS_mode() && !(md->flags & EVP_MD_FLAG_FIPS)
82 && (!(ctx->md_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW)
83 || !(ctx->i_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW)
84 || !(ctx->o_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW)))
85 OpenSSLDie(__FILE__,__LINE__,
86 "HMAC: digest not allowed in FIPS mode");
87#endif
88
89 reset=1;
90 j=EVP_MD_block_size(md);
91 OPENSSL_assert(j <= sizeof ctx->key);
92 if (j < len)
93 {
94 EVP_DigestInit_ex(&ctx->md_ctx,md, impl);
95 EVP_DigestUpdate(&ctx->md_ctx,key,len);
96 EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
97 &ctx->key_length);
98 }
99 else
100 {
101 OPENSSL_assert(len <= sizeof ctx->key);
102 memcpy(ctx->key,key,len);
103 ctx->key_length=len;
104 }
105 if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
106 memset(&ctx->key[ctx->key_length], 0,
107 HMAC_MAX_MD_CBLOCK - ctx->key_length);
108 }
109
110 if (reset)
111 {
112 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
113 pad[i]=0x36^ctx->key[i];
114 EVP_DigestInit_ex(&ctx->i_ctx,md, impl);
115 EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md));
116
117 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++)
118 pad[i]=0x5c^ctx->key[i];
119 EVP_DigestInit_ex(&ctx->o_ctx,md, impl);
120 EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md));
121 }
122 EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx);
123 }
124
125void HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
126 const EVP_MD *md)
127 {
128 if(key && md)
129 HMAC_CTX_init(ctx);
130 HMAC_Init_ex(ctx,key,len,md, NULL);
131 }
132
133void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len)
134 {
135 EVP_DigestUpdate(&ctx->md_ctx,data,len);
136 }
137
138void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
139 {
140 int j;
141 unsigned int i;
142 unsigned char buf[EVP_MAX_MD_SIZE];
143
144 j=EVP_MD_block_size(ctx->md);
145
146 EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i);
147 EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx);
148 EVP_DigestUpdate(&ctx->md_ctx,buf,i);
149 EVP_DigestFinal_ex(&ctx->md_ctx,md,len);
150 }
151
152void HMAC_CTX_init(HMAC_CTX *ctx)
153 {
154 EVP_MD_CTX_init(&ctx->i_ctx);
155 EVP_MD_CTX_init(&ctx->o_ctx);
156 EVP_MD_CTX_init(&ctx->md_ctx);
157 }
158
159void HMAC_CTX_cleanup(HMAC_CTX *ctx)
160 {
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);
165 }
166
167unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
168 const unsigned char *d, int n, unsigned char *md,
169 unsigned int *md_len)
170 {
171 HMAC_CTX c;
172 static unsigned char m[EVP_MAX_MD_SIZE];
173
174 if (md == NULL) md=m;
175 HMAC_CTX_init(&c);
176 HMAC_Init(&c,key,key_len,evp_md);
177 HMAC_Update(&c,d,n);
178 HMAC_Final(&c,md,md_len);
179 HMAC_CTX_cleanup(&c);
180 return(md);
181 }
182
183void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
184 {
185 EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
186 EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
187 EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
188 }
189
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