exptest.c

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/* crypto/bn/exptest.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([email protected]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([email protected])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([email protected])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../e_os.h"

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/rand.h>
#include <openssl/err.h>

#define NUM_BITS    (BN_BITS*2)

static const char rnd_seed[] = "string to make the random number generator think it has entropy";

int main(int argc, char *argv[])
    {
    BN_CTX *ctx;
    BIO *out=NULL;
    int i,ret;
    unsigned char c;
    BIGNUM *r_mont,*r_mont_const,*r_recp,*r_simple,*a,*b,*m;

    RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't
                                           * even check its return value
                                           * (which we should) */

    ERR_load_BN_strings();

    ctx=BN_CTX_new();
    if (ctx == NULL) EXIT(1);
    r_mont=BN_new();
    r_mont_const=BN_new();
    r_recp=BN_new();
    r_simple=BN_new();
    a=BN_new();
    b=BN_new();
    m=BN_new();
    if (    (r_mont == NULL) || (r_recp == NULL) ||
        (a == NULL) || (b == NULL))
        goto err;

    out=BIO_new(BIO_s_file());

    if (out == NULL) EXIT(1);
    BIO_set_fp(out,stdout,BIO_NOCLOSE);

    for (i=0; i<200; i++)
        {
        RAND_bytes(&c,1);
        c=(c%BN_BITS)-BN_BITS2;
        BN_rand(a,NUM_BITS+c,0,0);

        RAND_bytes(&c,1);
        c=(c%BN_BITS)-BN_BITS2;
        BN_rand(b,NUM_BITS+c,0,0);

        RAND_bytes(&c,1);
        c=(c%BN_BITS)-BN_BITS2;
        BN_rand(m,NUM_BITS+c,0,1);

        BN_mod(a,a,m,ctx);
        BN_mod(b,b,m,ctx);

        ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL);
        if (ret <= 0)
            {
            printf("BN_mod_exp_mont() problems\n");
            ERR_print_errors(out);
            EXIT(1);
            }

        ret=BN_mod_exp_recp(r_recp,a,b,m,ctx);
        if (ret <= 0)
            {
            printf("BN_mod_exp_recp() problems\n");
            ERR_print_errors(out);
            EXIT(1);
            }

        ret=BN_mod_exp_simple(r_simple,a,b,m,ctx);
        if (ret <= 0)
            {
            printf("BN_mod_exp_simple() problems\n");
            ERR_print_errors(out);
            EXIT(1);
            }

        ret=BN_mod_exp_mont_consttime(r_mont_const,a,b,m,ctx,NULL);
        if (ret <= 0)
            {
            printf("BN_mod_exp_mont_consttime() problems\n");
            ERR_print_errors(out);
            EXIT(1);
            }

        if (BN_cmp(r_simple, r_mont) == 0
            && BN_cmp(r_simple,r_recp) == 0
            && BN_cmp(r_simple,r_mont_const) == 0)
            {
            printf(".");
            fflush(stdout);
            }
        else
            {
            if (BN_cmp(r_simple,r_mont) != 0)
                printf("\nsimple and mont results differ\n");
            if (BN_cmp(r_simple,r_mont_const) != 0)
                printf("\nsimple and mont const time results differ\n");
            if (BN_cmp(r_simple,r_recp) != 0)
                printf("\nsimple and recp results differ\n");

            printf("a (%3d) = ",BN_num_bits(a));   BN_print(out,a);
            printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b);
            printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m);
            printf("\nsimple   ="); BN_print(out,r_simple);
            printf("\nrecp     ="); BN_print(out,r_recp);
            printf("\nmont     ="); BN_print(out,r_mont);
            printf("\nmont_ct  ="); BN_print(out,r_mont_const);
            printf("\n");
            EXIT(1);
            }
        }
    BN_free(r_mont);
    BN_free(r_mont_const);
    BN_free(r_recp);
    BN_free(r_simple);
    BN_free(a);
    BN_free(b);
    BN_free(m);
    BN_CTX_free(ctx);
    ERR_remove_thread_state(NULL);
    CRYPTO_mem_leaks(out);
    BIO_free(out);
    printf(" done\n");
    EXIT(0);
err:
    ERR_load_crypto_strings();
    ERR_print_errors(out);
#ifdef OPENSSL_SYS_NETWARE
    printf("ERROR\n");
#endif
    EXIT(1);
    return(1);
    }