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app_rand.c
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app_rand.c
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/* apps/app_rand.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#define NON_MAIN
#include "apps.h"
#undef NON_MAIN
#include <openssl/bio.h>
#include <openssl/rand.h>
static int seeded = 0;
static int egdsocket = 0;
int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
{
int consider_randfile = (file == NULL);
char buffer[200];
#ifdef OPENSSL_SYS_WINDOWS
RAND_screen();
#endif
if (file == NULL)
file = RAND_file_name(buffer, sizeof buffer);
else if (RAND_egd(file) > 0) {
/*
* we try if the given filename is an EGD socket. if it is, we don't
* write anything back to the file.
*/
egdsocket = 1;
return 1;
}
if (file == NULL || !RAND_load_file(file, -1)) {
if (RAND_status() == 0) {
if (!dont_warn) {
BIO_printf(bio_e, "unable to load 'random state'\n");
BIO_printf(bio_e,
"This means that the random number generator has not been seeded\n");
BIO_printf(bio_e, "with much random data.\n");
if (consider_randfile) { /* explanation does not apply when a
* file is explicitly named */
BIO_printf(bio_e,
"Consider setting the RANDFILE environment variable to point at a file that\n");
BIO_printf(bio_e,
"'random' data can be kept in (the file will be overwritten).\n");
}
}
return 0;
}
}
seeded = 1;
return 1;
}
long app_RAND_load_files(char *name)
{
char *p, *n;
int last;
long tot = 0;
int egd;
for (;;) {
last = 0;
for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ;
if (*p == '\0')
last = 1;
*p = '\0';
n = name;
name = p + 1;
if (*n == '\0')
break;
egd = RAND_egd(n);
if (egd > 0)
tot += egd;
else
tot += RAND_load_file(n, -1);
if (last)
break;
}
if (tot > 512)
app_RAND_allow_write_file();
return (tot);
}
int app_RAND_write_file(const char *file, BIO *bio_e)
{
char buffer[200];
if (egdsocket || !seeded)
/*
* If we did not manage to read the seed file, we should not write a
* low-entropy seed file back -- it would suppress a crucial warning
* the next time we want to use it.
*/
return 0;
if (file == NULL)
file = RAND_file_name(buffer, sizeof buffer);
if (file == NULL || !RAND_write_file(file)) {
BIO_printf(bio_e, "unable to write 'random state'\n");
return 0;
}
return 1;
}
void app_RAND_allow_write_file(void)
{
seeded = 1;
}