718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
404 lines
10 KiB
C
404 lines
10 KiB
C
/* $OpenBSD$ */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 2002 Jason L. Wright (jason@thought.net)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jason L. Wright
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/callout.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/random.h>
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#include <sys/sysctl.h>
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#include <machine/stdarg.h>
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#include <dev/rndtest/rndtest.h>
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static void rndtest_test(struct rndtest_state *);
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static void rndtest_timeout(void *);
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/* The tests themselves */
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static int rndtest_monobit(struct rndtest_state *);
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static int rndtest_runs(struct rndtest_state *);
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static int rndtest_longruns(struct rndtest_state *);
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static int rndtest_chi_4(struct rndtest_state *);
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static int rndtest_runs_check(struct rndtest_state *, int, int *);
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static void rndtest_runs_record(struct rndtest_state *, int, int *);
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static const struct rndtest_testfunc {
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int (*test)(struct rndtest_state *);
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} rndtest_funcs[] = {
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{ rndtest_monobit },
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{ rndtest_runs },
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{ rndtest_chi_4 },
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{ rndtest_longruns },
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};
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#define RNDTEST_NTESTS nitems(rndtest_funcs)
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static SYSCTL_NODE(_kern, OID_AUTO, rndtest, CTLFLAG_RD, 0,
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"RNG test parameters");
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static int rndtest_retest = 120; /* interval in seconds */
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SYSCTL_INT(_kern_rndtest, OID_AUTO, retest, CTLFLAG_RW, &rndtest_retest,
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0, "retest interval (seconds)");
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static struct rndtest_stats rndstats;
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SYSCTL_STRUCT(_kern_rndtest, OID_AUTO, stats, CTLFLAG_RD, &rndstats,
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rndtest_stats, "RNG test statistics");
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static int rndtest_verbose = 1; /* report only failures */
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SYSCTL_INT(_kern_rndtest, OID_AUTO, verbose, CTLFLAG_RW, &rndtest_verbose,
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0, "display results on console");
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struct rndtest_state *
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rndtest_attach(device_t dev)
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{
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struct rndtest_state *rsp;
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rsp = malloc(sizeof (*rsp), M_DEVBUF, M_NOWAIT);
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if (rsp != NULL) {
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rsp->rs_begin = rsp->rs_buf;
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rsp->rs_end = rsp->rs_buf + sizeof(rsp->rs_buf);
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rsp->rs_current = rsp->rs_begin;
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rsp->rs_discard = 1;
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rsp->rs_collect = 1;
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rsp->rs_parent = dev;
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#if __FreeBSD_version < 500000
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callout_init(&rsp->rs_to);
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#else
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callout_init(&rsp->rs_to, 1);
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#endif
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} else
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device_printf(dev, "rndtest_init: no memory for state block\n");
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return (rsp);
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}
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void
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rndtest_detach(struct rndtest_state *rsp)
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{
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callout_stop(&rsp->rs_to);
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free(rsp, M_DEVBUF);
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}
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void
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rndtest_harvest(struct rndtest_state *rsp, void *buf, u_int len)
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{
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size_t i;
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/*
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* If enabled, collect data and run tests when we have enough.
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*/
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if (rsp->rs_collect) {
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for (i = 0; i < len; i++) {
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*rsp->rs_current = ((u_char *) buf)[i];
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if (++rsp->rs_current == rsp->rs_end) {
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rndtest_test(rsp);
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rsp->rs_current = rsp->rs_begin;
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/*
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* If tests passed, turn off collection and
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* schedule another test. Otherwise we keep
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* testing until the data looks ok.
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*/
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if (!rsp->rs_discard && rndtest_retest != 0) {
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rsp->rs_collect = 0;
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callout_reset(&rsp->rs_to,
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hz * rndtest_retest,
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rndtest_timeout, rsp);
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break;
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}
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}
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}
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}
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/*
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* Only stir entropy that passes muster into the pool.
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*/
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if (rsp->rs_discard)
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rndstats.rst_discard += len;
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else
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/* MarkM: FIX!! Check that this does not swamp the harvester! */
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random_harvest_queue(buf, len, len*NBBY/2, RANDOM_PURE_RNDTEST);
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}
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static void
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rndtest_test(struct rndtest_state *rsp)
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{
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int i, rv = 0;
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rndstats.rst_tests++;
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for (i = 0; i < RNDTEST_NTESTS; i++)
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rv |= (*rndtest_funcs[i].test)(rsp);
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rsp->rs_discard = (rv != 0);
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}
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static void
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rndtest_report(struct rndtest_state *rsp, int failure, const char *fmt, ...)
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{
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char buf[80];
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va_list ap;
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if (rndtest_verbose == 0)
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return;
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if (!failure && rndtest_verbose == 1) /* don't report successes */
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return;
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va_start(ap, fmt);
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vsnprintf(buf, sizeof (buf), fmt, ap);
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va_end(ap);
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device_printf(rsp->rs_parent, "rndtest: %s\n", buf);
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}
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#define RNDTEST_MONOBIT_MINONES 9725
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#define RNDTEST_MONOBIT_MAXONES 10275
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static int
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rndtest_monobit(struct rndtest_state *rsp)
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{
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int i, ones = 0, j;
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u_int8_t r;
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for (i = 0; i < RNDTEST_NBYTES; i++) {
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r = rsp->rs_buf[i];
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for (j = 0; j < 8; j++, r <<= 1)
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if (r & 0x80)
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ones++;
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}
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if (ones > RNDTEST_MONOBIT_MINONES &&
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ones < RNDTEST_MONOBIT_MAXONES) {
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if (rndtest_verbose > 1)
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rndtest_report(rsp, 0, "monobit pass (%d < %d < %d)",
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RNDTEST_MONOBIT_MINONES, ones,
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RNDTEST_MONOBIT_MAXONES);
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return (0);
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} else {
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if (rndtest_verbose)
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rndtest_report(rsp, 1,
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"monobit failed (%d ones)", ones);
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rndstats.rst_monobit++;
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return (-1);
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}
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}
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#define RNDTEST_RUNS_NINTERVAL 6
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static const struct rndtest_runs_tabs {
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u_int16_t min, max;
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} rndtest_runs_tab[] = {
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{ 2343, 2657 },
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{ 1135, 1365 },
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{ 542, 708 },
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{ 251, 373 },
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{ 111, 201 },
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{ 111, 201 },
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};
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static int
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rndtest_runs(struct rndtest_state *rsp)
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{
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int i, j, ones, zeros, rv = 0;
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int onei[RNDTEST_RUNS_NINTERVAL], zeroi[RNDTEST_RUNS_NINTERVAL];
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u_int8_t c;
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bzero(onei, sizeof(onei));
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bzero(zeroi, sizeof(zeroi));
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ones = zeros = 0;
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for (i = 0; i < RNDTEST_NBYTES; i++) {
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c = rsp->rs_buf[i];
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for (j = 0; j < 8; j++, c <<= 1) {
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if (c & 0x80) {
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ones++;
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rndtest_runs_record(rsp, zeros, zeroi);
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zeros = 0;
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} else {
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zeros++;
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rndtest_runs_record(rsp, ones, onei);
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ones = 0;
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}
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}
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}
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rndtest_runs_record(rsp, ones, onei);
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rndtest_runs_record(rsp, zeros, zeroi);
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rv |= rndtest_runs_check(rsp, 0, zeroi);
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rv |= rndtest_runs_check(rsp, 1, onei);
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if (rv)
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rndstats.rst_runs++;
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return (rv);
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}
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static void
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rndtest_runs_record(struct rndtest_state *rsp, int len, int *intrv)
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{
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if (len == 0)
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return;
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if (len > RNDTEST_RUNS_NINTERVAL)
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len = RNDTEST_RUNS_NINTERVAL;
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len -= 1;
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intrv[len]++;
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}
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static int
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rndtest_runs_check(struct rndtest_state *rsp, int val, int *src)
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{
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int i, rv = 0;
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for (i = 0; i < RNDTEST_RUNS_NINTERVAL; i++) {
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if (src[i] < rndtest_runs_tab[i].min ||
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src[i] > rndtest_runs_tab[i].max) {
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rndtest_report(rsp, 1,
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"%s interval %d failed (%d, %d-%d)",
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val ? "ones" : "zeros",
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i + 1, src[i], rndtest_runs_tab[i].min,
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rndtest_runs_tab[i].max);
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rv = -1;
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} else {
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rndtest_report(rsp, 0,
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"runs pass %s interval %d (%d < %d < %d)",
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val ? "ones" : "zeros",
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i + 1, rndtest_runs_tab[i].min, src[i],
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rndtest_runs_tab[i].max);
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}
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}
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return (rv);
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}
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static int
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rndtest_longruns(struct rndtest_state *rsp)
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{
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int i, j, ones = 0, zeros = 0, maxones = 0, maxzeros = 0;
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u_int8_t c;
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for (i = 0; i < RNDTEST_NBYTES; i++) {
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c = rsp->rs_buf[i];
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for (j = 0; j < 8; j++, c <<= 1) {
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if (c & 0x80) {
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zeros = 0;
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ones++;
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if (ones > maxones)
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maxones = ones;
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} else {
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ones = 0;
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zeros++;
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if (zeros > maxzeros)
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maxzeros = zeros;
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}
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}
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}
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if (maxones < 26 && maxzeros < 26) {
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rndtest_report(rsp, 0, "longruns pass (%d ones, %d zeros)",
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maxones, maxzeros);
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return (0);
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} else {
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rndtest_report(rsp, 1, "longruns fail (%d ones, %d zeros)",
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maxones, maxzeros);
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rndstats.rst_longruns++;
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return (-1);
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}
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}
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/*
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* chi^2 test over 4 bits: (this is called the poker test in FIPS 140-2,
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* but it is really the chi^2 test over 4 bits (the poker test as described
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* by Knuth vol 2 is something different, and I take him as authoritative
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* on nomenclature over NIST).
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*/
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#define RNDTEST_CHI4_K 16
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#define RNDTEST_CHI4_K_MASK (RNDTEST_CHI4_K - 1)
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/*
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* The unnormalized values are used so that we don't have to worry about
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* fractional precision. The "real" value is found by:
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* (V - 1562500) * (16 / 5000) = Vn (where V is the unnormalized value)
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*/
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#define RNDTEST_CHI4_VMIN 1563181 /* 2.1792 */
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#define RNDTEST_CHI4_VMAX 1576929 /* 46.1728 */
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static int
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rndtest_chi_4(struct rndtest_state *rsp)
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{
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unsigned int freq[RNDTEST_CHI4_K], i, sum;
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for (i = 0; i < RNDTEST_CHI4_K; i++)
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freq[i] = 0;
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/* Get number of occurrences of each 4 bit pattern */
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for (i = 0; i < RNDTEST_NBYTES; i++) {
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freq[(rsp->rs_buf[i] >> 4) & RNDTEST_CHI4_K_MASK]++;
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freq[(rsp->rs_buf[i] >> 0) & RNDTEST_CHI4_K_MASK]++;
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}
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for (i = 0, sum = 0; i < RNDTEST_CHI4_K; i++)
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sum += freq[i] * freq[i];
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if (sum >= 1563181 && sum <= 1576929) {
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rndtest_report(rsp, 0, "chi^2(4): pass (sum %u)", sum);
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return (0);
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} else {
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rndtest_report(rsp, 1, "chi^2(4): failed (sum %u)", sum);
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rndstats.rst_chi++;
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return (-1);
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}
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}
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static void
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rndtest_timeout(void *xrsp)
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{
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struct rndtest_state *rsp = xrsp;
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rsp->rs_collect = 1;
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}
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static int
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rndtest_modevent(module_t mod, int type, void *unused)
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{
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switch (type) {
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case MOD_LOAD:
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return 0;
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case MOD_UNLOAD:
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return 0;
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}
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return EINVAL;
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}
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static moduledata_t rndtest_mod = {
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"rndtest",
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rndtest_modevent,
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0
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};
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DECLARE_MODULE(rndtest, rndtest_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
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MODULE_VERSION(rndtest, 1);
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