/* 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;

	}