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  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <stdio.h>
  39
  40 #include <roken.h>
  41 #include <getarg.h>
  42
  43 #include "rand.h"
  44
  45
  46 /*
  47  *
  48  */
  49
  50 static int version_flag;
  51 static int help_flag;
  52 static int len = 1024 * 1024;
  53 static char *rand_method;
  54 static char *filename;
  55
  56 static struct getargs args[] = {
  57     { "length", 0,      arg_integer,    &len,
  58       "length", NULL },
  59     { "file",   0,      arg_string,     &filename,
  60       "file name", NULL },
  61     { "method", 0,      arg_string,     &rand_method,
  62       "method", NULL },
  63     { "version",        0,      arg_flag,       &version_flag,
  64       "print version", NULL },
  65     { "help",           0,      arg_flag,       &help_flag,
  66       NULL,     NULL }
  67 };
  68
  69 /*
  70  *
  71  */
  72
  73 /*
  74  *
  75  */
  76
  77 static void
  78 usage (int ret)
  79 {
  80     arg_printusage (args,
  81                     sizeof(args)/sizeof(args[0]),
  82                     NULL,
  83                     "");
  84     exit (ret);
  85 }
  86
  87 int
  88 main(int argc, char **argv)
  89 {
  90     int idx = 0;
  91     char *buffer;
  92     char path[MAXPATHLEN];
  93
  94     setprogname(argv[0]);
  95
  96     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx))
  97         usage(1);
  98
  99     if (help_flag)
 100         usage(0);
 101
 102     if(version_flag){
 103         print_version(NULL);
 104         exit(0);
 105     }
 106
 107     argc -= idx;
 108     argv += idx;
 109
 110     if (argc != 0)
 111         usage(1);
 112
 113     buffer = emalloc(len);
 114
 115     if (rand_method) {
 116         if (0) {
 117         }
 118 #ifndef NO_RAND_FORTUNA_METHOD
 119         else if (strcasecmp(rand_method, "fortuna") == 0)
 120             RAND_set_rand_method(RAND_fortuna_method());
 121 #endif
 122 #ifndef NO_RAND_UNIX_METHOD
 123         else if (strcasecmp(rand_method, "unix") == 0)
 124             RAND_set_rand_method(RAND_unix_method());
 125 #endif
 126 #ifndef NO_RAND_EGD_METHOD
 127         else if (strcasecmp(rand_method, "egd") == 0)
 128             RAND_set_rand_method(RAND_egd_method());
 129 #endif
 130 #ifdef WIN32
 131         else if (strcasecmp(rand_method, "w32crypto") == 0)
 132             RAND_set_rand_method(RAND_w32crypto_method());
 133 #endif
 134         else
 135             errx(1, "unknown method %s", rand_method);
 136     }
 137
 138     if (RAND_file_name(path, sizeof(path)) == NULL)
 139         errx(1, "RAND_file_name failed");
 140
 141     if (RAND_status() != 1)
 142         errx(1, "random not ready yet");
 143
 144     if (RAND_bytes(buffer, len) != 1)
 145         errx(1, "RAND_bytes");
 146
 147     if (filename)
 148         rk_dumpdata(filename, buffer, len);
 149
 150     /* head vs tail */
 151     if (len >= 100000) {
 152         int bit, i;
 153         double res;
 154         int bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 155
 156         for (i = 0; i < len; i++) {
 157             unsigned char c = ((unsigned char *)buffer)[i];
 158             for (bit = 0; bit < 8 && c; bit++) {
 159                 if (c & 1)
 160                     bits[bit]++;
 161                 c = c >> 1;
 162             }
 163         }
 164
 165         for (bit = 0; bit < 8; bit++) {
 166
 167             res = ((double)abs(len - bits[bit] * 2)) / (double)len;
 168             if (res > 0.005)
 169                 errx(1, "head%d vs tail%d > 0.5%%%% %lf == %d vs %d",
 170                      bit, bit, res, len, bits[bit]);
 171
 172             printf("head vs tails bit%d: %lf\n", bit, res);
 173         }
 174     }
 175
 176     free(buffer);
 177
 178     /* test write random file */
 179     {
 180         static const char *file = "test.file";
 181         if (RAND_write_file(file) != 1)
 182             errx(1, "RAND_write_file");
 183         if (RAND_load_file(file, 1024) != 1)
 184             errx(1, "RAND_load_file");
 185         unlink(file);
 186     }
 187
 188     return 0;
 189 }