#include <s.h>

#include <assert.h>
#include <stdbool.h>
#include <stdio.h>

#include <siphash.h>

#include "logerr.h"
#include "random.h"

#include "hash.h"



static bool
SEED_INITIALIZED = false;

static u8
HASH_KEY[SIPHASH_KEY_LENGTH];



int
hash_setup(void) {
	int rc = -1;

	if (random_bytes(SIPHASH_KEY_LENGTH, &HASH_KEY)) {
		logerr("urandom_bytes()");
		goto out;
	}
	SEED_INITIALIZED = true;

	rc = 0;
out:
	return rc;
}

void
hash(
	const size_t inlen,
	const void *const restrict in,
	u8 out[HASH_OUTPUT_LENGTH]
) {
	assert(SEED_INITIALIZED == true);
	siphash(HASH_KEY, inlen, in, out);
}