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* a random source (random number generator)
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* Copyright(c) 2001-2006 Cisco Systems, Inc.
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <stdio.h> /* for printf() */
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#include <unistd.h> /* for getopt() */
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#include "crypto_kernel.h"
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* MAX_PRINT_STRING_LEN is defined in datatypes.h, and is the length
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* of the largest hexadecimal string that can be generated by the
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* function octet_string_hex_string().
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#define BUF_LEN (MAX_PRINT_STRING_LEN/2)
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usage(char *prog_name) {
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printf("usage: %s -n <num_bytes> [-l][ -d debug_module ]*\n"
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" -n <num> output <num> random bytes, where <num>"
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" is between zero and %d\n"
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" -l list the avaliable debug modules\n"
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" -d <mod> turn on debugging module <mod>\n",
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main (int argc, char *argv[]) {
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unsigned do_list_mods = 0;
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/* initialize kernel - we need to do this before anything else */
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status = crypto_kernel_init();
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printf("error: crypto_kernel init failed\n");
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/* process input arguments */
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q = getopt(argc, argv, "ld:n:");
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status = crypto_kernel_set_debug_module(optarg, 1);
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printf("error: set debug module (%s) failed\n", optarg);
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num_octets = atoi(optarg);
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if (num_octets < 0 || num_octets > BUF_LEN)
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status = crypto_kernel_list_debug_modules();
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printf("error: list of debug modules failed\n");
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if (num_octets > 0) {
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uint8_t buffer[BUF_LEN];
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status = crypto_get_random(buffer, num_octets);
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printf("error: failure in random source\n");
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printf("%s\n", octet_string_hex_string(buffer, num_octets));
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status = crypto_kernel_shutdown();
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printf("error: crypto_kernel shutdown failed\n");