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