lib/hcrypto/test_rand.c

   1 /*
   2  * Copyright (c) 2007 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdio.h>
  37
  38 #include <roken.h>
  39 #include <getarg.h>
  40
  41 #include "rand.h"
  42
  43
  44 /*
  45  *
  46  */
  47
  48 static int version_flag;
  49 static int help_flag;
  50 static int len = 1024 * 1024;
  51 static char *rand_method;
  52 static char *filename;
  53
  54 static struct getargs args[] = {
  55     { "length", 0,      arg_integer,    &len,
  56       "length", NULL },
  57     { "file",   0,      arg_string,     &filename,
  58       "file name", NULL },
  59     { "method", 0,      arg_string,     &rand_method,
  60       "method", NULL },
  61     { "version",        0,      arg_flag,       &version_flag,
  62       "print version", NULL },
  63     { "help",           0,      arg_flag,       &help_flag,
  64       NULL,     NULL }
  65 };
  66
  67 /*
  68  *
  69  */
  70
  71 /*
  72  *
  73  */
  74
  75 static void
  76 usage (int ret)
  77 {
  78     arg_printusage (args,
  79                     sizeof(args)/sizeof(args[0]),
  80                     NULL,
  81                     "");
  82     exit (ret);
  83 }
  84
  85 int
  86 main(int argc, char **argv)
  87 {
  88     int idx = 0;
  89     char *buffer;
  90     char path[MAXPATHLEN];
  91
  92     setprogname(argv[0]);
  93
  94     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx))
  95         usage(1);
  96
  97     if (help_flag)
  98         usage(0);
  99
 100     if(version_flag){
 101         print_version(NULL);
 102         exit(0);
 103     }
 104
 105     argc -= idx;
 106     argv += idx;
 107
 108     if (argc != 0)
 109         usage(1);
 110
 111     buffer = emalloc(len);
 112
 113     if (rand_method) {
 114         if (strcasecmp(rand_method, "fortuna") == 0)
 115             RAND_set_rand_method(RAND_fortuna_method());
 116         else if (strcasecmp(rand_method, "unix") == 0)
 117             RAND_set_rand_method(RAND_unix_method());
 118         else if (strcasecmp(rand_method, "egd") == 0)
 119             RAND_set_rand_method(RAND_egd_method());
 120         else
 121             errx(1, "unknown method %s", rand_method);
 122     }
 123
 124     if (RAND_file_name(path, sizeof(path)) == NULL)
 125         errx(1, "RAND_file_name failed");
 126
 127     if (RAND_status() != 1)
 128         errx(1, "random not ready yet");
 129
 130     if (RAND_bytes(buffer, len) != 1)
 131         errx(1, "RAND_bytes");
 132
 133     if (filename)
 134         rk_dumpdata(filename, buffer, len);
 135
 136     /* head vs tail */
 137     if (len >= 100000) {
 138         int bit, i;
 139         double res;
 140         int bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 141
 142         for (i = 0; i < len; i++) {
 143             unsigned char c = ((unsigned char *)buffer)[i];
 144             for (bit = 0; bit < 8 && c; bit++) {
 145                 if (c & 1)
 146                     bits[bit]++;
 147                 c = c >> 1;
 148             }
 149         }
 150
 151         for (bit = 0; bit < 8; bit++) {
 152
 153             res = ((double)abs(len - bits[bit] * 2)) / (double)len;
 154             if (res > 0.005)
 155                 errx(1, "head%d vs tail%d > 0.5%%%% %lf == %d vs %d",
 156                      bit, bit, res, len, bits[bit]);
 157
 158             printf("head vs tails bit%d: %lf\n", bit, res);
 159         }
 160     }
 161
 162     free(buffer);
 163
 164     /* test write random file */
 165     {
 166         static const char *file = "test.file";
 167         if (RAND_write_file(file) != 1)
 168             errx(1, "RAND_write_file");
 169         if (RAND_load_file(file, 1024) != 1)
 170             errx(1, "RAND_load_file");
 171         unlink(file);
 172     }
 173
 174     return 0;
 175 }