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/*
** Copyright 1998 - 1999 Double Precision, Inc.
** See COPYING for distribution information.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "hmac.h"
static const char rcsid[]="$Id: hmac.c,v 1.4 2006/01/22 03:37:04 mrsam Exp $";
struct hmac_hashinfo *hmac_list[]= {HMAC_LIST};
struct hhki {
const struct hmac_hashinfo *hh;
const char *k;
size_t kl;
unsigned char *kxopad;
unsigned char *kxipad;
void *context;
} ;
static void dohashkey(unsigned char *, void *);
static void docalcc(void *, void *);
void hmac_hashkey(const struct hmac_hashinfo *hh, const char *k,
size_t kl, unsigned char *kxopad, unsigned char *kxipad)
{
struct hhki i;
i.hh=hh;
i.k=k;
i.kl=kl;
i.kxopad=kxopad;
i.kxipad=kxipad;
(*hh->hh_allocacontext)( docalcc, (void *)&i );
}
static void dokeycalc(struct hhki *);
static void docalcc(void *c, void *v)
{
struct hhki *i=(struct hhki *)v;
i->context=c;
if (i->kl > i->hh->hh_B)
(*i->hh->hh_allocaval)(dohashkey, (void *)i);
else
dokeycalc( i );
}
static void dohashkey(unsigned char *keybuf, void *v)
{
struct hhki *i=(struct hhki *)v;
(*i->hh->hh_init)(i->context);
(*i->hh->hh_hash)(i->context, i->k, i->kl);
(*i->hh->hh_endhash)(i->context, i->kl);
(*i->hh->hh_getdigest)(i->context, keybuf);
i->k=(char *)keybuf;
i->kl=i->hh->hh_L;
dokeycalc(i);
}
static void dokeycalc(struct hhki *i)
{
char buf[64]; /* Random guess :-) */
unsigned n;
unsigned l;
(*i->hh->hh_init)(i->context);
n=0;
for (l=0; l<i->hh->hh_B; l++)
{
buf[n] = ( l < i->kl ? i->k[l]:0) ^ 0x5C;
if ( ++n >= sizeof(buf))
{
(*i->hh->hh_hash)(i->context, buf, sizeof(buf));
n=0;
}
}
if (n)
(*i->hh->hh_hash)(i->context, buf, n);
(*i->hh->hh_getdigest)(i->context, i->kxopad);
(*i->hh->hh_init)(i->context);
n=0;
for (l=0; l<i->hh->hh_B; l++)
{
buf[n] = ( l < i->kl ? i->k[l]:0) ^ 0x36;
if ( ++n >= sizeof(buf))
{
(*i->hh->hh_hash)(i->context, buf, sizeof(buf));
n=0;
}
}
if (n)
(*i->hh->hh_hash)(i->context, buf, n);
(*i->hh->hh_getdigest)(i->context, i->kxipad);
}
struct hhko {
const struct hmac_hashinfo *hh;
const char *t;
size_t tl;
const unsigned char *kxopad;
const unsigned char *kxipad;
unsigned char *hash;
} ;
static void docalch(void *, void *);
void hmac_hashtext (
const struct hmac_hashinfo *hh,
const char *t,
size_t tl,
const unsigned char *kxopad,
const unsigned char *kxipad,
unsigned char *hash)
{
struct hhko o;
o.hh=hh;
o.t=t;
o.tl=tl;
o.kxopad=kxopad;
o.kxipad=kxipad;
o.hash=hash;
(*hh->hh_allocacontext)( docalch, (void *)&o );
}
static void docalch(void *c, void *v)
{
struct hhko *o=(struct hhko *)v;
(o->hh->hh_setdigest)(c, o->kxipad);
(o->hh->hh_hash)(c, o->t, o->tl);
(o->hh->hh_endhash)(c, o->tl+o->hh->hh_B);
(o->hh->hh_getdigest)(c, o->hash);
(o->hh->hh_setdigest)(c, o->kxopad);
(o->hh->hh_hash)(c, o->hash, o->hh->hh_L);
(o->hh->hh_endhash)(c, o->hh->hh_L + o->hh->hh_B);
(o->hh->hh_getdigest)(c, o->hash);
}
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