1 /*
2 * rand_gen.c
3 *
4 * a random source (random number generator)
5 *
6 * David A. McGrew
7 * Cisco Systems, Inc.
8 */
9 /*
10 *
11 * Copyright(c) 2001-2006 Cisco Systems, Inc.
12 * All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 *
18 * Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 *
21 * Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials provided
24 * with the distribution.
25 *
26 * Neither the name of the Cisco Systems, Inc. nor the names of its
27 * contributors may be used to endorse or promote products derived
28 * from this software without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
34 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
35 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
36 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
37 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
41 * OF THE POSSIBILITY OF SUCH DAMAGE.
42 *
43 */
44
45
46 #include <stdio.h> /* for printf() */
47 #include <unistd.h> /* for getopt() */
48 #include "crypto_kernel.h"
49
50 /*
51 * MAX_PRINT_STRING_LEN is defined in datatypes.h, and is the length
52 * of the largest hexadecimal string that can be generated by the
53 * function octet_string_hex_string().
54 */
55
56 #define BUF_LEN (MAX_PRINT_STRING_LEN/2)
57
58 void
usage(char * prog_name)59 usage(char *prog_name) {
60 printf("usage: %s -n <num_bytes> [-l][ -d debug_module ]*\n"
61 " -n <num> output <num> random bytes, where <num>"
62 " is between zero and %d\n"
63 " -l list the avaliable debug modules\n"
64 " -d <mod> turn on debugging module <mod>\n",
65 prog_name, BUF_LEN);
66 exit(255);
67 }
68
69 int
main(int argc,char * argv[])70 main (int argc, char *argv[]) {
71 extern char *optarg;
72 int q;
73 int num_octets = 0;
74 unsigned do_list_mods = 0;
75 err_status_t status;
76
77 if (argc == 1)
78 usage(argv[0]);
79
80 /* initialize kernel - we need to do this before anything else */
81 status = crypto_kernel_init();
82 if (status) {
83 printf("error: crypto_kernel init failed\n");
84 exit(1);
85 }
86
87 /* process input arguments */
88 while (1) {
89 q = getopt(argc, argv, "ld:n:");
90 if (q == -1)
91 break;
92 switch (q) {
93 case 'd':
94 status = crypto_kernel_set_debug_module(optarg, 1);
95 if (status) {
96 printf("error: set debug module (%s) failed\n", optarg);
97 exit(1);
98 }
99 break;
100 case 'l':
101 do_list_mods = 1;
102 break;
103 case 'n':
104 num_octets = atoi(optarg);
105 if (num_octets < 0 || num_octets > BUF_LEN)
106 usage(argv[0]);
107 break;
108 default:
109 usage(argv[0]);
110 }
111 }
112
113 if (do_list_mods) {
114 status = crypto_kernel_list_debug_modules();
115 if (status) {
116 printf("error: list of debug modules failed\n");
117 exit(1);
118 }
119 }
120
121 if (num_octets > 0) {
122 uint8_t buffer[BUF_LEN];
123
124 status = crypto_get_random(buffer, num_octets);
125 if (status) {
126 printf("error: failure in random source\n");
127 } else {
128 printf("%s\n", octet_string_hex_string(buffer, num_octets));
129 }
130 }
131
132 status = crypto_kernel_shutdown();
133 if (status) {
134 printf("error: crypto_kernel shutdown failed\n");
135 exit(1);
136 }
137
138 return 0;
139 }
140
141