1 #ifndef HEADER_CURL_HMAC_H
2 #define HEADER_CURL_HMAC_H
3 /***************************************************************************
4  *                                  _   _ ____  _
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9  *
10  * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
11  *
12  * This software is licensed as described in the file COPYING, which
13  * you should have received as part of this distribution. The terms
14  * are also available at https://curl.haxx.se/docs/copyright.html.
15  *
16  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17  * copies of the Software, and permit persons to whom the Software is
18  * furnished to do so, under the terms of the COPYING file.
19  *
20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21  * KIND, either express or implied.
22  *
23  ***************************************************************************/
24 
25 #ifndef CURL_DISABLE_CRYPTO_AUTH
26 
27 #define HMAC_MD5_LENGTH 16
28 
29 typedef void    (* HMAC_hinit_func)(void *context);
30 typedef void    (* HMAC_hupdate_func)(void *context,
31                                       const unsigned char *data,
32                                       unsigned int len);
33 typedef void    (* HMAC_hfinal_func)(unsigned char *result, void *context);
34 
35 
36 /* Per-hash function HMAC parameters. */
37 struct HMAC_params {
38   HMAC_hinit_func
39   hmac_hinit;     /* Initialize context procedure. */
40   HMAC_hupdate_func     hmac_hupdate;   /* Update context with data. */
41   HMAC_hfinal_func      hmac_hfinal;    /* Get final result procedure. */
42   unsigned int          hmac_ctxtsize;  /* Context structure size. */
43   unsigned int          hmac_maxkeylen; /* Maximum key length (bytes). */
44   unsigned int          hmac_resultlen; /* Result length (bytes). */
45 };
46 
47 
48 /* HMAC computation context. */
49 struct HMAC_context {
50   const struct HMAC_params *hmac_hash; /* Hash function definition. */
51   void *hmac_hashctxt1;         /* Hash function context 1. */
52   void *hmac_hashctxt2;         /* Hash function context 2. */
53 };
54 
55 
56 /* Prototypes. */
57 struct HMAC_context *Curl_HMAC_init(const struct HMAC_params *hashparams,
58                                     const unsigned char *key,
59                                     unsigned int keylen);
60 int Curl_HMAC_update(struct HMAC_context *context,
61                      const unsigned char *data,
62                      unsigned int len);
63 int Curl_HMAC_final(struct HMAC_context *context, unsigned char *result);
64 
65 CURLcode Curl_hmacit(const struct HMAC_params *hashparams,
66                      const unsigned char *key, const size_t keylen,
67                      const unsigned char *data, const size_t datalen,
68                      unsigned char *output);
69 
70 #endif
71 
72 #endif /* HEADER_CURL_HMAC_H */
73