crypto/bn/exptest.c

   1 /* crypto/bn/exptest.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include "bio.h"
  63 #include "bn.h"
  64 #include "rand.h"
  65 #include "err.h"
  66 #ifdef WINDOWS
  67 #include "../bio/bss_file.c"
  68 #endif
  69
  70 #define NUM_BITS        (BN_BITS*2)
  71
  72 int main(int argc, char *argv[])
  73         {
  74         BN_CTX *ctx;
  75         BIO *out=NULL;
  76         int i,ret;
  77         unsigned char c;
  78         BIGNUM *r_mont,*r_recp,*a,*b,*m;
  79
  80         ERR_load_BN_strings();
  81
  82         ctx=BN_CTX_new();
  83         if (ctx == NULL) exit(1);
  84         r_mont=BN_new();
  85         r_recp=BN_new();
  86         a=BN_new();
  87         b=BN_new();
  88         m=BN_new();
  89         if (    (r_mont == NULL) || (r_recp == NULL) ||
  90                 (a == NULL) || (b == NULL))
  91                 goto err;
  92
  93         out=BIO_new(BIO_s_file());
  94
  95         if (out == NULL) exit(1);
  96         BIO_set_fp(out,stdout,BIO_NOCLOSE);
  97
  98         for (i=0; i<200; i++)
  99                 {
 100                 RAND_bytes(&c,1);
 101                 c=(c%BN_BITS)-BN_BITS2;
 102                 BN_rand(a,NUM_BITS+c,0,0);
 103
 104                 RAND_bytes(&c,1);
 105                 c=(c%BN_BITS)-BN_BITS2;
 106                 BN_rand(b,NUM_BITS+c,0,0);
 107
 108                 RAND_bytes(&c,1);
 109                 c=(c%BN_BITS)-BN_BITS2;
 110                 BN_rand(m,NUM_BITS+c,0,1);
 111
 112                 BN_mod(a,a,m,ctx);
 113                 BN_mod(b,b,m,ctx);
 114
 115                 ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL);
 116                 if (ret <= 0)
 117                         {
 118                         printf("BN_mod_exp_mont() problems\n");
 119                         ERR_print_errors(out);
 120                         exit(1);
 121                         }
 122
 123                 ret=BN_mod_exp_recp(r_recp,a,b,m,ctx);
 124                 if (ret <= 0)
 125                         {
 126                         printf("BN_mod_exp_recp() problems\n");
 127                         ERR_print_errors(out);
 128                         exit(1);
 129                         }
 130
 131                 if (BN_cmp(r_mont,r_recp) != 0)
 132                         {
 133                         printf("\nmont and recp results differ\n");
 134                         printf("a (%3d) = ",BN_num_bits(a));   BN_print(out,a);
 135                         printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b);
 136                         printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m);
 137                         printf("\nrecp     ="); BN_print(out,r_recp);
 138                         printf("\nmont     ="); BN_print(out,r_mont);
 139                         printf("\n");
 140                         exit(1);
 141                         }
 142                 else
 143                         {
 144                         printf(".");
 145                         fflush(stdout);
 146                         }
 147                 }
 148         CRYPTO_mem_leaks(out);
 149         printf(" done\n");
 150         exit(0);
 151 err:
 152         ERR_load_crypto_strings();
 153         ERR_print_errors(out);
 154         exit(1);
 155         return(1);
 156         }
 157