Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 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 |
| 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 |
| 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 | |