/* * siprandom.c: relatively fast pseudo-random data generator * * Copyright (c) 2016, Přemysl Eric Janouch
* * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * */ #include "config.h" #undef PROGRAM_NAME #define PROGRAM_NAME "siprandom" #include "liberty/liberty.c" static void parse_program_arguments (int argc, char **argv) { static const struct opt opts[] = { { 'd', "debug", NULL, 0, "run in debug mode" }, { 'h', "help", NULL, 0, "display this help and exit" }, { 'V', "version", NULL, 0, "output version information and exit" }, { 0, NULL, NULL, 0, NULL } }; struct opt_handler oh = opt_handler_make (argc, argv, opts, NULL, "PRNG."); int c; while ((c = opt_handler_get (&oh)) != -1) switch (c) { case 'd': g_debug_mode = true; break; case 'h': opt_handler_usage (&oh, stdout); exit (EXIT_SUCCESS); case 'V': printf (PROGRAM_NAME " " PROGRAM_VERSION "\n"); exit (EXIT_SUCCESS); default: print_error ("wrong options"); opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } argc -= optind; argv += optind; if (argc) { opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } opt_handler_free (&oh); } int main (int argc, char *argv[]) { parse_program_arguments (argc, argv); uint64_t counter, hash; struct error *e = NULL; if (!random_bytes (g_siphash_key, sizeof g_siphash_key, &e) || !random_bytes (&counter, sizeof counter, &e) || !random_bytes (&hash, sizeof hash, &e)) exit_fatal ("%s: %s", "failed to obtain random data seed", e->message); do { hash ^= siphash_wrapper (&counter, sizeof counter); counter++; } while (fwrite (&hash, sizeof hash, 1, stdout) == 1); return EXIT_SUCCESS; }