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#ifndef hmac_h
#define hmac_h
#include <string.h>
/*
** Copyright 1998 - 2005 Double Precision, Inc.
** See COPYING for distribution information.
*/
#ifdef __cplusplus
extern "C" {
#endif
struct hmac_hashinfo { /* HMAC hash function descriptor */
const char *hh_name; /* Name of this hash function (md5, sha1...) */
size_t hh_B; /* Length of compression blocks */
size_t hh_L; /* Length of hash outputs */
size_t hh_S; /* Length of 'context structure' */
/* Hash functions */
void (*hh_init)(void *); /* Initialize context structure */
void (*hh_hash)(void *, const void *, unsigned);
/* Feed the hash function */
void (*hh_endhash)(void *, unsigned long); /* Calculate final hash */
void (*hh_getdigest)(void *, unsigned char *); /* Get the hash value */
void (*hh_setdigest)(void *, const unsigned char *);
/* Set the hash value */
/* Some helper functions */
/* Allocate context on stack, instead of mallocing it. Calls the
** provided function pointer, with context as first arg. The second
** arg will be passed as provided.
*/
void (*hh_allocacontext)(void (*)(void *, void *), void *);
/* Like allocacontext, but alloc buffer for hash value, hh_L */
void (*hh_allocaval)(void (*)(unsigned char *, void *), void *);
} ;
/* Known hash functions */
extern struct hmac_hashinfo hmac_md5, hmac_sha1, hmac_sha256;
/*
** List of installed hash functions, dynamically generated at configuration
** time.
*/
extern struct hmac_hashinfo *hmac_list[];
/*
To calculate an HMAC, allocate three buffers - outer, inner, and hash.
Call hmac_hashkey, then hmac_hashtext.
After hmac_haskey returns, the contents of inner and outer can be
saved, as they contain a complete intermediate state of the hash
calculation.
*/
void hmac_hashkey(
const struct hmac_hashinfo *,
const char *, /* Key */
size_t, /* Key length */
unsigned char *, /* Output - outer buffer, prehashed */
unsigned char *); /* Output - inner buffer, prehashed */
void hmac_hashtext (
const struct hmac_hashinfo *,
const char *, /* Text */
size_t, /* Text length */
const unsigned char *, /* outer buffer, prehashed */
const unsigned char *, /* inner buffer, prehashed */
unsigned char *); /* Output - the hash */
#ifdef __cplusplus
}
#endif
#endif
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