iterated_hash.c revision 290001 
1/*
2 * Copyright (C) 2006, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/* $Id: iterated_hash.c,v 1.6 2009/02/18 23:47:48 tbox Exp $ */
18
19#include "config.h"
20
21#include <stdio.h>
22
23#include <isc/sha1.h>
24#include <isc/iterated_hash.h>
25
26int
27isc_iterated_hash(unsigned char out[ISC_SHA1_DIGESTLENGTH],
28		  unsigned int hashalg, int iterations,
29		  const unsigned char *salt, int saltlength,
30		  const unsigned char *in, int inlength)
31{
32	isc_sha1_t ctx;
33	int n = 0;
34
35	if (hashalg != 1)
36		return (0);
37
38	do {
39		isc_sha1_init(&ctx);
40		isc_sha1_update(&ctx, in, inlength);
41		isc_sha1_update(&ctx, salt, saltlength);
42		isc_sha1_final(&ctx, out);
43		in = out;
44		inlength = ISC_SHA1_DIGESTLENGTH;
45	} while (n++ < iterations);
46
47	return (ISC_SHA1_DIGESTLENGTH);
48}
49