source: trunk/third/openssl/apps/rand.c @ 18442

/* 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           - encode output
 * num               - write 'num' bytes
 */

int MAIN(int, char **);

int MAIN(int argc, char **argv)
        {
        ENGINE *e = NULL;
        int i, r, ret = 1;
        int badopt;
        char *outfile = NULL;
        char *inrand = NULL;
        int base64 = 0;
        BIO *out = NULL;
        int num = -1;
        char *engine=NULL;

        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;
                        }
                else if (strcmp(argv[i], "-engine") == 0)
                        {
                        if ((argv[i+1] != NULL) && (engine == NULL))
                                engine = argv[++i];
                        else
                                badopt = 1;
                        }
                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 (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 (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");
                BIO_printf(bio_err, "-engine e             - use engine e, possibly a hardware device.\n");
                BIO_printf(bio_err, "-rand file%cfile%c... - seed PRNG from files\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
                BIO_printf(bio_err, "-base64               - encode output\n");
                goto err;
                }

        e = setup_engine(bio_err, engine, 0);

        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 > sizeof buf)
                        chunk = sizeof buf;
                r = RAND_bytes(buf, chunk);
                if (r <= 0)
                        goto err;
                BIO_write(out, buf, chunk);
                num -= chunk;
                }
        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);
        }