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 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #ifdef RCSID
  39 RCSID("$Id$");
  40 #endif
  41
  42 #include <stdio.h>
  43
  44 #include <roken.h>
  45 #include <getarg.h>
  46
  47 #include "rand.h"
  48
  49
  50 /*
  51  *
  52  */
  53
  54 static int version_flag;
  55 static int help_flag;
  56 static int len = 1024 * 1024;
  57 static char *rand_method;
  58 static char *filename;
  59
  60 static struct getargs args[] = {
  61     { "length", 0,      arg_integer,    &len,
  62       "length", NULL },
  63     { "file",   0,      arg_string,     &filename,
  64       "file name", NULL },
  65     { "method", 0,      arg_string,     &rand_method,
  66       "method", NULL },
  67     { "version",        0,      arg_flag,       &version_flag,
  68       "print version", NULL },
  69     { "help",           0,      arg_flag,       &help_flag,
  70       NULL,     NULL }
  71 };
  72
  73 /*
  74  *
  75  */
  76
  77 /*
  78  *
  79  */
  80
  81 static void
  82 usage (int ret)
  83 {
  84     arg_printusage (args,
  85                     sizeof(args)/sizeof(args[0]),
  86                     NULL,
  87                     "");
  88     exit (ret);
  89 }
  90
  91 int
  92 main(int argc, char **argv)
  93 {
  94     int idx = 0;
  95     char *buffer;
  96     char path[MAXPATHLEN];
  97
  98     setprogname(argv[0]);
  99
 100     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx))
 101         usage(1);
 102
 103     if (help_flag)
 104         usage(0);
 105
 106     if(version_flag){
 107         print_version(NULL);
 108         exit(0);
 109     }
 110
 111     argc -= idx;
 112     argv += idx;
 113
 114     if (argc != 0)
 115         usage(1);
 116
 117     buffer = emalloc(len);
 118
 119     if (rand_method) {
 120         if (strcasecmp(rand_method, "fortuna") == 0)
 121             RAND_set_rand_method(RAND_fortuna_method());
 122         else if (strcasecmp(rand_method, "unix") == 0)
 123             RAND_set_rand_method(RAND_unix_method());
 124         else if (strcasecmp(rand_method, "egd") == 0)
 125             RAND_set_rand_method(RAND_egd_method());
 126         else
 127             errx(1, "unknown method %s", rand_method);
 128     }
 129
 130     if (RAND_file_name(path, sizeof(path)) == NULL)
 131         errx(1, "RAND_file_name failed");
 132
 133     if (RAND_status() != 1)
 134         errx(1, "random not ready yet");
 135
 136     if (RAND_bytes(buffer, len) != 1)
 137         errx(1, "RAND_bytes");
 138
 139     if (filename)
 140         rk_dumpdata(filename, buffer, len);
 141
 142     /* head vs tail */
 143     if (len >= 100000) {
 144         int bit, i;
 145         double res;
 146         int bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 147
 148         for (i = 0; i < len; i++) {
 149             unsigned char c = ((unsigned char *)buffer)[i];
 150             for (bit = 0; bit < 8 && c; bit++) {
 151                 if (c & 1)
 152                     bits[bit]++;
 153                 c = c >> 1;
 154             }
 155         }
 156
 157         for (bit = 0; bit < 8; bit++) {
 158
 159             res = ((double)abs(len - bits[bit] * 2)) / (double)len;
 160             if (res > 0.005)
 161                 errx(1, "head%d vs tail%d > 0.5%%%% %lf == %d vs %d",
 162                      bit, bit, res, len, bits[bit]);
 163
 164             printf("head vs tails bit%d: %lf\n", bit, res);
 165         }
 166     }
 167
 168     free(buffer);
 169
 170     /* test write random file */
 171     {
 172         static const char *file = "test.file";
 173         if (RAND_write_file(file) != 1)
 174             errx(1, "RAND_write_file");
 175         if (RAND_load_file(file, 1024) != 1)
 176             errx(1, "RAND_load_file");
 177         unlink(file);
 178     }
 179
 180     return 0;
 181 }