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 {
77 const EVP_MD *md;
78 EVP_MD_CTX md_ctx;
79 EVP_MD_CTX i_ctx;
80 EVP_MD_CTX o_ctx;
81 unsigned int key_length;
82 unsigned char key[HMAC_MAX_MD_CBLOCK];
83 } HMAC_CTX;
84
85 #define HMAC_size(e) (EVP_MD_size((e)->md))
86
87
88 void HMAC_CTX_init(HMAC_CTX *ctx);
89 void HMAC_CTX_cleanup(HMAC_CTX *ctx);
90
91 #define HMAC_cleanup(ctx) HMAC_CTX_cleanup(ctx) /* deprecated */
92
93 int HMAC_Init(HMAC_CTX *ctx, const void *key, int len,
94 const EVP_MD *md); /* deprecated */
95 int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
96 const EVP_MD *md, ENGINE *impl);
97 int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len);
98 int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len);
99 unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
100 const unsigned char *d, size_t n, unsigned char *md,
101 unsigned int *md_len);
102 int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx);
103
104 void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags);
105
106 #ifdef __cplusplus
107 }
108 #endif
109
110 #endif