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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/crypto/krb/t_fortuna.c - Fortuna test program */
/*
* Copyright (c) 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (C) 2011 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
#ifdef FORTUNA
/* Include most of prng_fortuna.c so we can test the PRNG internals. */
#define TEST
#include "prng_fortuna.c"
static void
display(const unsigned char *data, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
printf("%02X", data[i]);
printf("\n");
}
/*
* Generate data from st with its current internal state and check for
* significant bias in each bit of the resulting bytes. This test would have a
* small chance of failure on random inputs, but we have a predictable state
* after all the other tests have been run, so it will never fail if the PRNG
* operates the way we expect.
*/
static void
head_tail_test(struct fortuna_state *st)
{
static unsigned char buffer[1024 * 1024];
unsigned char c;
size_t i, len = sizeof(buffer);
int bit, bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
double res;
memset(buffer, 0, len);
generator_output(st, buffer, len);
for (i = 0; i < len; i++) {
c = buffer[i];
for (bit = 0; bit < 8 && c; bit++) {
if (c & 1)
bits[bit]++;
c = c >> 1;
}
}
for (bit = 0; bit < 8; bit++) {
res = ((double)abs(len - bits[bit] * 2)) / (double)len;
if (res > 0.005){
fprintf(stderr,
"Bit %d: %d zero, %d one exceeds 0.5%% variance (%f)\n",
bit, (int)len - bits[bit], bits[bit], res);
exit(1);
}
}
}
int
main(int argc, char **argv)
{
struct fortuna_state test_state;
struct fortuna_state *st = &test_state;
static unsigned char buf[2 * 1024 * 1024];
unsigned int i;
/* Seed the generator with a known state. */
init_state(&test_state);
generator_reseed(st, (unsigned char *)"test", 4);
/* Generate two pieces of output; key should change for each request. */
generator_output(st, buf, 32);
display(buf, 32);
generator_output(st, buf, 32);
display(buf, 32);
/* Generate a lot of output to test key changes during request. */
generator_output(st, buf, sizeof(buf));
display(buf, 32);
display(buf + sizeof(buf) - 32, 32);
/* Reseed the generator and generate more output. */
generator_reseed(st, (unsigned char *)"retest", 6);
generator_output(st, buf, 32);
display(buf, 32);
/* Add sample data to accumulator pools. */
for (i = 0; i < 44; i++) {
store_32_be(i, buf);
accumulator_add_event(st, buf, 4);
}
assert(st->pool_index == 12);
assert(st->pool0_bytes == 8);
/* Exercise accumulator reseeds. */
accumulator_reseed(st);
generator_output(st, buf, 32);
display(buf, 32);
accumulator_reseed(st);
generator_output(st, buf, 32);
display(buf, 32);
accumulator_reseed(st);
generator_output(st, buf, 32);
display(buf, 32);
for (i = 0; i < 1000; i++)
accumulator_reseed(st);
assert(st->reseed_count == 1003);
generator_output(st, buf, 32);
display(buf, 32);
head_tail_test(st);
return 0;
}
#else /* FORTUNA */
int
main()
{
return 0;
}
#endif /* FORTUNA */
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