/* 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

 	BIO_printf(bio_e,"Loading 'screen' into random state -");

 	BIO_flush(bio_e);

 	RAND_screen();

 	BIO_printf(bio_e," done\n");

 #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;

 	}