text: /* apps/rand.c */
  /* ====================================================================
   * Copyright (c) 1998-2001 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).
   *
   */
  
  #include "apps.h"
  
  #include <ctype.h>
  #include <stdio.h>
  #include <string.h>
  
  #include <openssl/bio.h>
  #include <openssl/err.h>
  #include <openssl/rand.h>
  
  #undef PROG
  #define PROG rand_main
  
  /* -out file         - write to file
   * -rand file:file   - PRNG seed files
   * -base64           - base64 encode output
   * -hex              - hex encode output
   * num               - write 'num' bytes
   */
  
  int MAIN(int, char **);
  
  int MAIN(int argc, char **argv)
  	{
  #ifndef OPENSSL_NO_ENGINE
  	ENGINE *e = NULL;
  #endif
  	int i, r, ret = 1;
  	int badopt;
  	char *outfile = NULL;
  	char *inrand = NULL;
  	int base64 = 0;
  	int hex = 0;
  	BIO *out = NULL;
  	int num = -1;
  #ifndef OPENSSL_NO_ENGINE
  	char *engine=NULL;
  #endif
  
  	apps_startup();
  
  	if (bio_err == NULL)
  		if ((bio_err = BIO_new(BIO_s_file())) != NULL)
  			BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
  
  	if (!load_config(bio_err, NULL))
  		goto err;
  
  	badopt = 0;
  	i = 0;
  	while (!badopt && argv[++i] != NULL)
  		{
  		if (strcmp(argv[i], "-out") == 0)
  			{
  			if ((argv[i+1] != NULL) && (outfile == NULL))
  				outfile = argv[++i];
  			else
  				badopt = 1;
  			}
  #ifndef OPENSSL_NO_ENGINE
  		else if (strcmp(argv[i], "-engine") == 0)
  			{
  			if ((argv[i+1] != NULL) && (engine == NULL))
  				engine = argv[++i];
  			else
  				badopt = 1;
  			}
  #endif
  		else if (strcmp(argv[i], "-rand") == 0)
  			{
  			if ((argv[i+1] != NULL) && (inrand == NULL))
  				inrand = argv[++i];
  			else
  				badopt = 1;
  			}
  		else if (strcmp(argv[i], "-base64") == 0)
  			{
  			if (!base64)
  				base64 = 1;
  			else
  				badopt = 1;
  			}
  		else if (strcmp(argv[i], "-hex") == 0)
  			{
  			if (!hex)
  				hex = 1;
  			else
  				badopt = 1;
  			}
  		else if (isdigit((unsigned char)argv[i][0]))
  			{
  			if (num < 0)
  				{
  				r = sscanf(argv[i], "%d", &num);
  				if (r == 0 || num < 0)
  					badopt = 1;
  				}
  			else
  				badopt = 1;
  			}
  		else
  			badopt = 1;
  		}
  
  	if (hex && base64)
  		badopt = 1;
  
  	if (num < 0)
  		badopt = 1;
  	
  	if (badopt) 
  		{
  		BIO_printf(bio_err, "Usage: rand [options] num\n");
  		BIO_printf(bio_err, "where options are\n");
  		BIO_printf(bio_err, "-out file             - write to file\n");
  #ifndef OPENSSL_NO_ENGINE
  		BIO_printf(bio_err, "-engine e             - use engine e, possibly a hardware device.\n");
  #endif
  		BIO_printf(bio_err, "-rand file%cfile%c... - seed PRNG from files\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
  		BIO_printf(bio_err, "-base64               - base64 encode output\n");
  		BIO_printf(bio_err, "-hex                  - hex encode output\n");
  		goto err;
  		}
  
  #ifndef OPENSSL_NO_ENGINE
          e = setup_engine(bio_err, engine, 0);
  #endif
  
  	app_RAND_load_file(NULL, bio_err, (inrand != NULL));
  	if (inrand != NULL)
  		BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
  			app_RAND_load_files(inrand));
  
  	out = BIO_new(BIO_s_file());
  	if (out == NULL)
  		goto err;
  	if (outfile != NULL)
  		r = BIO_write_filename(out, outfile);
  	else
  		{
  		r = BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
  #ifdef OPENSSL_SYS_VMS
  		{
  		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
  		out = BIO_push(tmpbio, out);
  		}
  #endif
  		}
  	if (r <= 0)
  		goto err;
  
  	if (base64)
  		{
  		BIO *b64 = BIO_new(BIO_f_base64());
  		if (b64 == NULL)
  			goto err;
  		out = BIO_push(b64, out);
  		}
  	
  	while (num > 0) 
  		{
  		unsigned char buf[4096];
  		int chunk;
  
  		chunk = num;
  		if (chunk > (int)sizeof(buf))
  			chunk = sizeof buf;
  		r = RAND_bytes(buf, chunk);
  		if (r <= 0)
  			goto err;
  		if (!hex) 
  			BIO_write(out, buf, chunk);
  		else
  			{
  			for (i = 0; i < chunk; i++)
  				BIO_printf(out, "%02x", buf[i]);
  			}
  		num -= chunk;
  		}
  	if (hex)
  		BIO_puts(out, "\n");
  	(void)BIO_flush(out);
  
  	app_RAND_write_file(NULL, bio_err);
  	ret = 0;
  	
  err:
  	ERR_print_errors(bio_err);
  	if (out)
  		BIO_free_all(out);
  	apps_shutdown();
  	OPENSSL_EXIT(ret);
  	}
  