apps/lib/app_rand.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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     }
  30     if (save_rand_file == NULL)
  31         save_rand_file = OPENSSL_strdup(randfile);
  32 }
  33
  34 static int loadfiles(char *name)
  35 {
  36     char *p;
  37     int last, ret = 1;
  38
  39     for ( ; ; ) {
  40         last = 0;
  41         for (p = name; *p != '\0' && *p != LIST_SEPARATOR_CHAR; p++)
  42             continue;
  43         if (*p == '\0')
  44             last = 1;
  45         *p = '\0';
  46         if (RAND_load_file(name, -1) < 0) {
  47             BIO_printf(bio_err, "Can't load %s into RNG\n", name);
  48             ERR_print_errors(bio_err);
  49             ret = 0;
  50         }
  51         if (last)
  52             break;
  53         name = p + 1;
  54         if (*name == '\0')
  55             break;
  56     }
  57     return ret;
  58 }
  59
  60 void app_RAND_write(void)
  61 {
  62     if (save_rand_file == NULL)
  63         return;
  64     if (RAND_write_file(save_rand_file) == -1) {
  65         BIO_printf(bio_err, "Cannot write random bytes:\n");
  66         ERR_print_errors(bio_err);
  67     }
  68     OPENSSL_free(save_rand_file);
  69     save_rand_file =  NULL;
  70 }
  71
  72
  73 /*
  74  * See comments in opt_verify for explanation of this.
  75  */
  76 enum r_range { OPT_R_ENUM };
  77
  78 int opt_rand(int opt)
  79 {
  80     switch ((enum r_range)opt) {
  81     case OPT_R__FIRST:
  82     case OPT_R__LAST:
  83         break;
  84     case OPT_R_RAND:
  85         return loadfiles(opt_arg());
  86         break;
  87     case OPT_R_WRITERAND:
  88         OPENSSL_free(save_rand_file);
  89         save_rand_file = OPENSSL_strdup(opt_arg());
  90         break;
  91     }
  92     return 1;
  93 }