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Remove the legacy interactive mode from openssl(1).

This removes the legacy interactive mode from openssl(1) since it is
rarely used, complicates the code, and has also been removed from
OpenSSL in version 3.x.x.

ok tb@ jsing@

/* $OpenBSD: prime.c,v 1.14 2022/11/11 17:07:39 joshua 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>
#include <openssl/err.h>

struct {
	int bits;
	int checks;
	int generate;
	int hex;
	int safe;
} prime_config;

static const struct option prime_options[] = {
	{
		.name = "bits",
		.argname = "n",
		.desc = "Number of bits in the generated prime number",
		.type = OPTION_ARG_INT,
		.opt.value = &prime_config.bits,
	},
	{
		.name = "checks",
		.argname = "n",
		.desc = "Miller-Rabin probablistic primality test iterations",
		.type = OPTION_ARG_INT,
		.opt.value = &prime_config.checks,
	},
	{
		.name = "generate",
		.desc = "Generate a pseudo-random prime number",
		.type = OPTION_FLAG,
		.opt.flag = &prime_config.generate,
	},
	{
		.name = "hex",
		.desc = "Hexadecimal prime numbers",
		.type = OPTION_FLAG,
		.opt.flag = &prime_config.hex,
	},
	{
		.name = "safe",
		.desc = "Generate only \"safe\" prime numbers",
		.type = OPTION_FLAG,
		.opt.flag = &prime_config.safe,
	},
	{NULL},
};

static void
prime_usage()
{
	fprintf(stderr,
	    "usage: prime [-bits n] [-checks n] [-generate] [-hex] [-safe] "
	    "p\n");
	options_usage(prime_options);
}

int
prime_main(int argc, char **argv)
{
	BIGNUM *bn = NULL;
	char *prime = NULL;
	BIO *bio_out;
	char *s;
	int is_prime, ret = 1;

	if (pledge("stdio rpath", NULL) == -1) {
		perror("pledge");
		exit(1);
	}

	memset(&prime_config, 0, sizeof(prime_config));

	/* Default iterations for Miller-Rabin probabilistic primality test. */
	prime_config.checks = 20;

	if (options_parse(argc, argv, prime_options, &prime, NULL) != 0) {
		prime_usage();
		return (1);
	}

	if (prime == NULL && prime_config.generate == 0) {
		BIO_printf(bio_err, "No prime specified.\n");
		prime_usage();
		return (1);
	}

	if ((bio_out = BIO_new(BIO_s_file())) == NULL) {
		ERR_print_errors(bio_err);
		return (1);
	}
	BIO_set_fp(bio_out, stdout, BIO_NOCLOSE);

	if (prime_config.generate != 0) {
		if (prime_config.bits == 0) {
			BIO_printf(bio_err, "Specify the number of bits.\n");
			goto end;
		}
		bn = BN_new();
		if (!bn) {
			BIO_printf(bio_err, "Out of memory.\n");
			goto end;
		}
		if (!BN_generate_prime_ex(bn, prime_config.bits,
		    prime_config.safe, NULL, NULL, NULL)) {
			BIO_printf(bio_err, "Prime generation error.\n");
			goto end;
		}
		s = prime_config.hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
		if (s == NULL) {
			BIO_printf(bio_err, "Out of memory.\n");
			goto end;
		}
		BIO_printf(bio_out, "%s\n", s);
		free(s);
	} else {
		if (prime_config.hex) {
			if (!BN_hex2bn(&bn, prime)) {
				BIO_printf(bio_err, "%s is an invalid hex "
				    "value.\n", prime);
				goto end;
			}
		} else {
			if (!BN_dec2bn(&bn, prime)) {
				BIO_printf(bio_err, "%s is an invalid decimal "
				    "value.\n", prime);
				goto end;
			}
		}

		is_prime = BN_is_prime_ex(bn, prime_config.checks, NULL, NULL);
		if (is_prime < 0) {
			BIO_printf(bio_err, "BN_is_prime_ex failed.\n");
			goto end;
		}
		BIO_printf(bio_out, "%s is %sprime\n", prime,
		    is_prime == 1 ? "" : "not ");
	}

	ret = 0;

 end:
	BN_free(bn);
	BIO_free_all(bio_out);

	return (ret);
}