openssl/apps/prime.c

/* ====================================================================
 * 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 "apps.h"
#include <openssl/bn.h>

#undef PROG
#define PROG prime_main

int MAIN(int, char **);

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

    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);

    --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 = atoi(*++argv);
        else if (!strcmp(*argv, "-safe"))
            safe = 1;
        else if (!strcmp(*argv, "-checks"))
            if (--argc < 1)
                goto bad;
            else
                checks = atoi(*++argv);
        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);
#ifdef OPENSSL_SYS_VMS
        {
            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
            bio_out = BIO_push(tmpbio, bio_out);
        }
#endif
    }

    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);
        OPENSSL_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:
    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;
}