/* $OpenBSD: prime.c,v 1.10 2014/06/12 15:49:27 deraadt Exp $ */
/* ====================================================================
 * Copyright (c) 2004 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.
 *
 */

#include <string.h>
#include <limits.h>

#include "apps.h"

#include <openssl/bn.h>

int prime_main(int, char **);

int 
prime_main(int argc, char **argv)
{
	int hex = 0;
	int checks = 20;
	int generate = 0;
	int bits = 0;
	int safe = 0;
	BIGNUM *bn = NULL;
	const char *errstr = NULL;
	BIO *bio_out;

	--argc;
	++argv;
	while (argc >= 1 && **argv == '-') {
		if (!strcmp(*argv, "-hex"))
			hex = 1;
		else if (!strcmp(*argv, "-generate"))
			generate = 1;
		else if (!strcmp(*argv, "-bits")) {
			if (--argc < 1)
				goto bad;
			else
				bits = strtonum(*(++argv), 0, INT_MAX, &errstr);
			if (errstr)
				goto bad;
		} else if (!strcmp(*argv, "-safe"))
			safe = 1;
		else if (!strcmp(*argv, "-checks")) {
			if (--argc < 1)
				goto bad;
			else
				checks = strtonum(*(++argv), 0, INT_MAX, &errstr);
			if (errstr)
				goto bad;
		} else {
			BIO_printf(bio_err, "Unknown option '%s'\n", *argv);
			goto bad;
		}
		--argc;
		++argv;
	}

	if (argv[0] == NULL && !generate) {
		BIO_printf(bio_err, "No prime specified\n");
		goto bad;
	}
	if ((bio_out = BIO_new(BIO_s_file())) != NULL) {
		BIO_set_fp(bio_out, stdout, BIO_NOCLOSE);
	}
	if (generate) {
		char *s;

		if (!bits) {
			BIO_printf(bio_err, "Specifiy the number of bits.\n");
			return 1;
		}
		bn = BN_new();
		BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL);
		s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
		BIO_printf(bio_out, "%s\n", s);
		free(s);
	} else {
		if (hex)
			BN_hex2bn(&bn, argv[0]);
		else
			BN_dec2bn(&bn, argv[0]);

		BN_print(bio_out, bn);
		BIO_printf(bio_out, " is %sprime\n",
		    BN_is_prime_ex(bn, checks, NULL, NULL) ? "" : "not ");
	}

	BN_free(bn);
	BIO_free_all(bio_out);

	return 0;

bad:
	if (errstr)
		BIO_printf(bio_err, "invalid argument %s: %s\n", *argv, errstr);
	else {
		BIO_printf(bio_err, "options are\n");
		BIO_printf(bio_err, "%-14s hex\n", "-hex");
		BIO_printf(bio_err, "%-14s number of checks\n", "-checks <n>");
	}
	return 1;
}