diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/test_rand.c')
| -rw-r--r-- | third_party/heimdal/lib/hcrypto/test_rand.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/test_rand.c b/third_party/heimdal/lib/hcrypto/test_rand.c new file mode 100644 index 0000000..b3ee2b1 --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/test_rand.c @@ -0,0 +1,219 @@ +/* + * Copyright (c) 2007 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Portions Copyright (c) 2009 Apple Inc. 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. + */ + +#include <config.h> +#include <roken.h> +#include <math.h> + +#include <getarg.h> + +#include "rand.h" + + +/* + * + */ + +static int version_flag; +static int help_flag; +static int len = 1024 * 1024; +static char *rand_method; +static char *filename; + +static struct getargs args[] = { + { "length", 0, arg_integer, &len, + "length", NULL }, + { "file", 0, arg_string, &filename, + "file name", NULL }, + { "method", 0, arg_string, &rand_method, + "method", NULL }, + { "version", 0, arg_flag, &version_flag, + "print version", NULL }, + { "help", 0, arg_flag, &help_flag, + NULL, NULL } +}; + +/* + * + */ + +/* + * + */ + +static void +usage (int ret) +{ + arg_printusage (args, + sizeof(args)/sizeof(args[0]), + NULL, + ""); + exit (ret); +} + +int +main(int argc, char **argv) +{ + int idx = 0; + char *buffer; + char path[MAXPATHLEN]; + + setprogname(argv[0]); + + if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx)) + usage(1); + + if (help_flag) + usage(0); + + if(version_flag){ + print_version(NULL); + exit(0); + } + + if (argc != idx) + usage(1); + + buffer = emalloc(len); + + if (rand_method) { + if (0) { + } +#ifndef NO_RAND_FORTUNA_METHOD + else if (strcasecmp(rand_method, "fortuna") == 0) + RAND_set_rand_method(RAND_fortuna_method()); +#endif +#ifndef NO_RAND_UNIX_METHOD + else if (strcasecmp(rand_method, "unix") == 0) + RAND_set_rand_method(RAND_unix_method()); +#endif +#ifdef WIN32 + else if (strcasecmp(rand_method, "w32crypto") == 0) + RAND_set_rand_method(RAND_w32crypto_method()); +#endif + else + errx(1, "unknown method %s", rand_method); + } + + if (RAND_file_name(path, sizeof(path)) == NULL) + errx(1, "RAND_file_name failed"); + + if (RAND_status() != 1) + errx(1, "random not ready yet"); + + if (RAND_bytes(buffer, len) != 1) + errx(1, "RAND_bytes"); + + if (filename) + rk_dumpdata(filename, buffer, len); + + /* head vs tail */ + if (len >= 100000) { + unsigned bytes[256]; + unsigned bits[8]; + size_t bit, i; + double res; + double slen = sqrt((double)len); + + memset(bits, 0, sizeof(bits)); + memset(bytes, 0, sizeof(bytes)); + + for (i = 0; i < len; i++) { + unsigned char c = ((unsigned char *)buffer)[i]; + + bytes[c]++; + + for (bit = 0; bit < 8 && c; bit++) { + if (c & 1) + bits[bit]++; + c = c >> 1; + } + } + + /* + * The count for each bit value has a mean of n*p = len/2, + * and a standard deviation of sqrt(n*p*q) ~ sqrt(len/4). + * Normalizing by dividing by "n*p", we get a mean of 1 and + * a standard deviation of sqrt(q/n*p) = 1/sqrt(len). + * + * A 5.33-sigma event happens 1 time in 10 million. + * A 5.73-sigma event happens 1 time in 100 million. + * A 6.11-sigma event happens 1 time in 1000 million. + * + * We tolerate 5.33-sigma events (we have 8 not entirely + * independent chances of skewed results) and want to fail + * with a good RNG less often than 1 time in million. + */ + for (bit = 0; bit < 8; bit++) { + res = slen * fabs(1.0 - 2 * (double)bits[bit] / len); + if (res > 5.33) + errx(1, "head%d vs tail%d: %.1f-sigma (%d of %d)", + (int)bit, (int)bit, res, bits[bit], len); + printf("head vs tails bit%d: %f-sigma\n", (int)bit, res); + } + + /* + * The count of each byte value has a mean of n*p = len/256, + * and a standard deviation of sqrt(n*p*q) ~ sqrt(len/256). + * Normalizing by dividing by "n*p", we get a mean of 1 and + * a standard deviation of sqrt(q/n*p) ~ 16/sqrt(len). + * + * We tolerate 5.73-sigma events (we have 256 not entirely + * independent chances of skewed results). Note, for example, + * a 5.2-sigma event was observed in ~5,000 runs. + */ + for (i = 0; i < 256; i++) { + res = (slen / 16) * fabs(1.0 - 256 * (double)bytes[i] / len); + if (res > 5.73) + errx(1, "byte %d: %.1f-sigma (%d of %d)", + (int) i, res, bytes[i], len); + printf("byte %d: %f-sigma\n", (int)i, res); + } + } + + free(buffer); + + /* test write random file */ + { + static const char *file = "test.file"; + if (RAND_write_file(file) != 1) + errx(1, "RAND_write_file"); + if (RAND_load_file(file, 1024) != 1) + errx(1, "RAND_load_file"); + unlink(file); + } + + return 0; +} |