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/*
* rand_gen.c
*
* a random source (random number generator)
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright(c) 2001-2006 Cisco Systems, 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:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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 <stdio.h> /* for printf() */
#include <unistd.h> /* for getopt() */
#include "crypto_kernel.h"
/*
* MAX_PRINT_STRING_LEN is defined in datatypes.h, and is the length
* of the largest hexadecimal string that can be generated by the
* function octet_string_hex_string().
*/
#define BUF_LEN (MAX_PRINT_STRING_LEN/2)
void
usage(char *prog_name) {
printf("usage: %s -n <num_bytes> [-l][ -d debug_module ]*\n"
" -n <num> output <num> random bytes, where <num>"
" is between zero and %d\n"
" -l list the avaliable debug modules\n"
" -d <mod> turn on debugging module <mod>\n",
prog_name, BUF_LEN);
exit(255);
}
int
main (int argc, char *argv[]) {
extern char *optarg;
int q;
int num_octets = 0;
unsigned do_list_mods = 0;
err_status_t status;
if (argc == 1)
usage(argv[0]);
/* initialize kernel - we need to do this before anything else */
status = crypto_kernel_init();
if (status) {
printf("error: crypto_kernel init failed\n");
exit(1);
}
/* process input arguments */
while (1) {
q = getopt(argc, argv, "ld:n:");
if (q == -1)
break;
switch (q) {
case 'd':
status = crypto_kernel_set_debug_module(optarg, 1);
if (status) {
printf("error: set debug module (%s) failed\n", optarg);
exit(1);
}
break;
case 'l':
do_list_mods = 1;
break;
case 'n':
num_octets = atoi(optarg);
if (num_octets < 0 || num_octets > BUF_LEN)
usage(argv[0]);
break;
default:
usage(argv[0]);
}
}
if (do_list_mods) {
status = crypto_kernel_list_debug_modules();
if (status) {
printf("error: list of debug modules failed\n");
exit(1);
}
}
if (num_octets > 0) {
uint8_t buffer[BUF_LEN];
status = crypto_get_random(buffer, num_octets);
if (status) {
printf("error: failure in random source\n");
} else {
printf("%s\n", octet_string_hex_string(buffer, num_octets));
}
}
status = crypto_kernel_shutdown();
if (status) {
printf("error: crypto_kernel shutdown failed\n");
exit(1);
}
return 0;
}
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