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