text: /* 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;
  	}
  