apps/app_rand.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "apps.h"
  11 #include <openssl/bio.h>
  12 #include <openssl/err.h>
  13 #include <openssl/rand.h>
  14 #include <openssl/conf.h>
  15
  16 static char *save_rand_file;
  17
  18 void app_RAND_load_conf(CONF *c, const char *section)
  19 {
  20     const char *randfile = NCONF_get_string(c, section, "RANDFILE");
  21
  22     if (randfile == NULL) {
  23         ERR_clear_error();
  24         return;
  25     }
  26     if (RAND_load_file(randfile, -1) < 0) {
  27         BIO_printf(bio_err, "Can't load %s into RNG\n", randfile);
  28         ERR_print_errors(bio_err);
  29         return;
  30     }
  31     if (save_rand_file == NULL)
  32         save_rand_file = OPENSSL_strdup(randfile);
  33 }
  34
  35 static int loadfiles(char *name)
  36 {
  37     char *p;
  38     int last, ret = 1;
  39
  40     for ( ; ; ) {
  41         last = 0;
  42         for (p = name; *p != '\0' && *p != LIST_SEPARATOR_CHAR; p++)
  43             continue;
  44         if (*p == '\0')
  45             last = 1;
  46         *p = '\0';
  47         if (RAND_load_file(name, -1) < 0) {
  48             BIO_printf(bio_err, "Can't load %s into RNG\n", name);
  49             ERR_print_errors(bio_err);
  50             ret = 0;
  51         }
  52         if (last)
  53             break;
  54         name = p + 1;
  55         if (*name == '\0')
  56             break;
  57     }
  58     return ret;
  59 }
  60
  61 void app_RAND_write(void)
  62 {
  63     if (save_rand_file == NULL)
  64         return;
  65     if (RAND_write_file(save_rand_file) == -1) {
  66         BIO_printf(bio_err, "Cannot write random bytes:\n");
  67         ERR_print_errors(bio_err);
  68     }
  69     OPENSSL_free(save_rand_file);
  70     save_rand_file =  NULL;
  71 }
  72
  73
  74 /*
  75  * See comments in opt_verify for explanation of this.
  76  */
  77 enum r_range { OPT_R_ENUM };
  78
  79 int opt_rand(int opt)
  80 {
  81     switch ((enum r_range)opt) {
  82     case OPT_R__FIRST:
  83     case OPT_R__LAST:
  84         break;
  85     case OPT_R_RAND:
  86         return loadfiles(opt_arg());
  87         break;
  88     case OPT_R_WRITERAND:
  89         OPENSSL_free(save_rand_file);
  90         save_rand_file = OPENSSL_strdup(opt_arg());
  91         break;
  92     }
  93     return 1;
  94 }