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