/*
 * fips.h -- Performs FIPS 140-1/140-2 tests for RNGs
 *
 * Copyright (C) 2001 Philipp Rumpf
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335  USA
 */

#ifndef FIPS__H
#define FIPS__H

/*  Size of a FIPS test buffer, do not change this */
#define FIPS_RNG_BUFFER_SIZE 2500

/* Context for running FIPS tests */
struct fips_ctx {
	int poker[16], runs[12];
	int ones, rlength, current_bit, last_bit, longrun;
	unsigned int last32;
};
typedef struct fips_ctx fips_ctx_t;

/* Initializes the context for FIPS tests.  last32 contains
 * 32 bits of RNG data to init the continuous run test */
extern void fips_init(fips_ctx_t *ctx, unsigned int last32);

/*
 * Return values for fips_run_rng_test.  These values are OR'ed together
 * for all tests that failed.
 */
#define FIPS_RNG_MONOBIT	0x0001 /* FIPS 140-2 2001-10-10 monobit */
#define FIPS_RNG_POKER		0x0002 /* FIPS 140-2 2001-10-10 poker */
#define FIPS_RNG_RUNS		0x0004 /* FIPS 140-2 2001-10-10 runs */
#define FIPS_RNG_LONGRUN	0x0008 /* FIPS 140-2 2001-10-10 long run */
#define FIPS_RNG_CONTINUOUS_RUN 0x0010 /* FIPS 140-2 continuous run */

/*
 * Names for the FIPS tests, and bitmask
 */
#define N_FIPS_TESTS 5
extern const char *fips_test_names[N_FIPS_TESTS];
extern const unsigned int fips_test_mask[N_FIPS_TESTS];

/*
 *  Runs the FIPS 140-1 4.11.1 and 4.11.2 tests, as updated by
 *  FIPS 140-2 4.9, errata from 2001-10-10 (which set more strict
 *  intervals for the tests to pass), on a buffer of size
 *  FIPS_RNG_BUFFER_SIZE, using the given context.
 *
 *  FIPS 140-2, errata of 2002-12-03 removed tests for non-deterministic
 *  RNGs, other than Continuous Run test.
 *
 *  This funtion returns 0 if all tests passed, or a bitmask
 *  with bits set for every test that failed.
 *
 *  It returns -1 if either fips_ctx or buf is NULL.
 */
extern int fips_run_rng_test(fips_ctx_t *ctx, const void *buf);

#endif /* FIPS__H */
