crypto/openssl/apps/app_rand.c

   1 /* apps/app_rand.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #define NON_MAIN
 113 #include "apps.h"
 114 #undef NON_MAIN
 115 #include <openssl/bio.h>
 116 #include <openssl/rand.h>
 117
 118 static int seeded = 0;
 119 static int egdsocket = 0;
 120
 121 int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
 122 {
 123     int consider_randfile = (file == NULL);
 124     char buffer[200];
 125
 126 #ifdef OPENSSL_SYS_WINDOWS
 127     BIO_printf(bio_e, "Loading 'screen' into random state -");
 128     BIO_flush(bio_e);
 129     RAND_screen();
 130     BIO_printf(bio_e, " done\n");
 131 #endif
 132
 133     if (file == NULL)
 134         file = RAND_file_name(buffer, sizeof buffer);
 135     else if (RAND_egd(file) > 0) {
 136         /*
 137          * we try if the given filename is an EGD socket. if it is, we don't
 138          * write anything back to the file.
 139          */
 140         egdsocket = 1;
 141         return 1;
 142     }
 143     if (file == NULL || !RAND_load_file(file, -1)) {
 144         if (RAND_status() == 0) {
 145             if (!dont_warn) {
 146                 BIO_printf(bio_e, "unable to load 'random state'\n");
 147                 BIO_printf(bio_e,
 148                            "This means that the random number generator has not been seeded\n");
 149                 BIO_printf(bio_e, "with much random data.\n");
 150                 if (consider_randfile) { /* explanation does not apply when a
 151                                           * file is explicitly named */
 152                     BIO_printf(bio_e,
 153                                "Consider setting the RANDFILE environment variable to point at a file that\n");
 154                     BIO_printf(bio_e,
 155                                "'random' data can be kept in (the file will be overwritten).\n");
 156                 }
 157             }
 158             return 0;
 159         }
 160     }
 161     seeded = 1;
 162     return 1;
 163 }
 164
 165 long app_RAND_load_files(char *name)
 166 {
 167     char *p, *n;
 168     int last;
 169     long tot = 0;
 170     int egd;
 171
 172     for (;;) {
 173         last = 0;
 174         for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
 175         if (*p == '\0')
 176             last = 1;
 177         *p = '\0';
 178         n = name;
 179         name = p + 1;
 180         if (*n == '\0')
 181             break;
 182
 183         egd = RAND_egd(n);
 184         if (egd > 0)
 185             tot += egd;
 186         else
 187             tot += RAND_load_file(n, -1);
 188         if (last)
 189             break;
 190     }
 191     if (tot > 512)
 192         app_RAND_allow_write_file();
 193     return (tot);
 194 }
 195
 196 int app_RAND_write_file(const char *file, BIO *bio_e)
 197 {
 198     char buffer[200];
 199
 200     if (egdsocket || !seeded)
 201         /*
 202          * If we did not manage to read the seed file, we should not write a
 203          * low-entropy seed file back -- it would suppress a crucial warning
 204          * the next time we want to use it.
 205          */
 206         return 0;
 207
 208     if (file == NULL)
 209         file = RAND_file_name(buffer, sizeof buffer);
 210     if (file == NULL || !RAND_write_file(file)) {
 211         BIO_printf(bio_e, "unable to write 'random state'\n");
 212         return 0;
 213     }
 214     return 1;
 215 }
 216
 217 void app_RAND_allow_write_file(void)
 218 {
 219     seeded = 1;
 220 }