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/*
* iterated_hash.c -- nsec3 hash calculation.
*
* Copyright (c) 2001-2011, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
* With thanks to Ben Laurie.
*/
#include <config.h>
#ifdef NSEC3
#include <openssl/sha.h>
#include <stdio.h>
#include <assert.h>
#include "iterated_hash.h"
int
iterated_hash(unsigned char out[SHA_DIGEST_LENGTH],
const unsigned char *salt, int saltlength,
const unsigned char *in, int inlength, int iterations)
{
#if defined(NSEC3) && defined(HAVE_SSL)
SHA_CTX ctx;
int n;
assert(in && inlength > 0 && iterations >= 0);
for(n=0 ; n <= iterations ; ++n)
{
SHA1_Init(&ctx);
SHA1_Update(&ctx, in, inlength);
if(saltlength > 0)
SHA1_Update(&ctx, salt, saltlength);
SHA1_Final(out, &ctx);
in=out;
inlength=SHA_DIGEST_LENGTH;
}
return SHA_DIGEST_LENGTH;
#else
return 0;
#endif
}
#endif /* NSEC3 */
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