bind/lib/isc/iterated_hash.c

/*
 * Copyright (C) 2006, 2008  Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: iterated_hash.c,v 1.4 2008/09/24 03:16:58 tbox Exp $ */

#include <stdio.h>

#include <isc/sha1.h>
#include <isc/iterated_hash.h>

int
isc_iterated_hash(unsigned char out[ISC_SHA1_DIGESTLENGTH],
		  unsigned int hashalg, int iterations,
		  const unsigned char *salt, int saltlength,
		  const unsigned char *in, int inlength)
{
	isc_sha1_t ctx;
	int n = 0;

	if (hashalg != 1)
		return (0);

	do {
		isc_sha1_init(&ctx);
		isc_sha1_update(&ctx, in, inlength);
		isc_sha1_update(&ctx, salt, saltlength);
		isc_sha1_final(&ctx, out);
		in = out;
		inlength = ISC_SHA1_DIGESTLENGTH;
	} while (n++ < iterations);

	return (ISC_SHA1_DIGESTLENGTH);
}