1 /* crypto/hmac/hmac.h */
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 #ifndef HEADER_HMAC_H
59 # define HEADER_HMAC_H
60 
61 # include <openssl/opensslconf.h>
62 
63 # ifdef OPENSSL_NO_HMAC
64 #  error HMAC is disabled.
65 # endif
66 
67 # include <openssl/evp.h>
68 
69 # define HMAC_MAX_MD_CBLOCK      128/* largest known is SHA512 */
70 
71 #ifdef  __cplusplus
72 extern "C" {
73 #endif
74 
75 typedef struct hmac_ctx_st {
76     const EVP_MD *md;
77     EVP_MD_CTX md_ctx;
78     EVP_MD_CTX i_ctx;
79     EVP_MD_CTX o_ctx;
80     unsigned int key_length;
81     unsigned char key[HMAC_MAX_MD_CBLOCK];
82 } HMAC_CTX;
83 
84 # define HMAC_size(e)    (EVP_MD_size((e)->md))
85 
86 void HMAC_CTX_init(HMAC_CTX *ctx);
87 void HMAC_CTX_cleanup(HMAC_CTX *ctx);
88 
89 /* deprecated */
90 # define HMAC_cleanup(ctx) HMAC_CTX_cleanup(ctx)
91 
92 /* deprecated */
93 int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md);
94 int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
95                  const EVP_MD *md, ENGINE *impl);
96 int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len);
97 int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
98 unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
99                     const unsigned char *d, size_t n, unsigned char *md,
100                     unsigned int *md_len);
101 int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx);
102 
103 void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags);
104 
105 #ifdef  __cplusplus
106 }
107 #endif
108 
109 #endif
110