bind9/lib/isc/iterated_hash.c

#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);
}