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
  63 #include "../e_os.h"
  64
  65 #include <openssl/bio.h>
  66 #include <openssl/bn.h>
  67 #include <openssl/rand.h>
  68 #include <openssl/err.h>
  69 #ifdef OPENSSL_SYS_WINDOWS
  70 #include "../bio/bss_file.c"
  71 #endif
  72
  73 #define NUM_BITS        (BN_BITS*2)
  74
  75 static const char rnd_seed[] = "string to make the random number generator think it has entropy";
  76
  77 int main(int argc, char *argv[])
  78         {
  79         BN_CTX *ctx;
  80         BIO *out=NULL;
  81         int i,ret;
  82         unsigned char c;
  83         BIGNUM *r_mont,*r_recp,*r_simple,*a,*b,*m;
  84
  85         RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't
  86                                                * even check its return value
  87                                                * (which we should) */
  88
  89         ERR_load_BN_strings();
  90
  91         ctx=BN_CTX_new();
  92         if (ctx == NULL) EXIT(1);
  93         r_mont=BN_new();
  94         r_recp=BN_new();
  95         r_simple=BN_new();
  96         a=BN_new();
  97         b=BN_new();
  98         m=BN_new();
  99         if (    (r_mont == NULL) || (r_recp == NULL) ||
 100                 (a == NULL) || (b == NULL))
 101                 goto err;
 102
 103         out=BIO_new(BIO_s_file());
 104
 105         if (out == NULL) EXIT(1);
 106         BIO_set_fp(out,stdout,BIO_NOCLOSE);
 107
 108         for (i=0; i<200; i++)
 109                 {
 110                 RAND_bytes(&c,1);
 111                 c=(c%BN_BITS)-BN_BITS2;
 112                 BN_rand(a,NUM_BITS+c,0,0);
 113
 114                 RAND_bytes(&c,1);
 115                 c=(c%BN_BITS)-BN_BITS2;
 116                 BN_rand(b,NUM_BITS+c,0,0);
 117
 118                 RAND_bytes(&c,1);
 119                 c=(c%BN_BITS)-BN_BITS2;
 120                 BN_rand(m,NUM_BITS+c,0,1);
 121
 122                 BN_mod(a,a,m,ctx);
 123                 BN_mod(b,b,m,ctx);
 124
 125                 ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL);
 126                 if (ret <= 0)
 127                         {
 128                         printf("BN_mod_exp_mont() problems\n");
 129                         ERR_print_errors(out);
 130                         EXIT(1);
 131                         }
 132
 133                 ret=BN_mod_exp_recp(r_recp,a,b,m,ctx);
 134                 if (ret <= 0)
 135                         {
 136                         printf("BN_mod_exp_recp() problems\n");
 137                         ERR_print_errors(out);
 138                         EXIT(1);
 139                         }
 140
 141                 ret=BN_mod_exp_simple(r_simple,a,b,m,ctx);
 142                 if (ret <= 0)
 143                         {
 144                         printf("BN_mod_exp_simple() problems\n");
 145                         ERR_print_errors(out);
 146                         EXIT(1);
 147                         }
 148
 149                 if (BN_cmp(r_simple, r_mont) == 0
 150                     && BN_cmp(r_simple,r_recp) == 0)
 151                         {
 152                         printf(".");
 153                         fflush(stdout);
 154                         }
 155                 else
 156                         {
 157                         if (BN_cmp(r_simple,r_mont) != 0)
 158                                 printf("\nsimple and mont results differ\n");
 159                         if (BN_cmp(r_simple,r_recp) != 0)
 160                                 printf("\nsimple and recp results differ\n");
 161
 162                         printf("a (%3d) = ",BN_num_bits(a));   BN_print(out,a);
 163                         printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b);
 164                         printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m);
 165                         printf("\nsimple   ="); BN_print(out,r_simple);
 166                         printf("\nrecp     ="); BN_print(out,r_recp);
 167                         printf("\nmont     ="); BN_print(out,r_mont);
 168                         printf("\n");
 169                         EXIT(1);
 170                         }
 171                 }
 172         BN_free(r_mont);
 173         BN_free(r_recp);
 174         BN_free(r_simple);
 175         BN_free(a);
 176         BN_free(b);
 177         BN_free(m);
 178         BN_CTX_free(ctx);
 179         ERR_remove_state(0);
 180         CRYPTO_mem_leaks(out);
 181         BIO_free(out);
 182         printf(" done\n");
 183         EXIT(0);
 184 err:
 185         ERR_load_crypto_strings();
 186         ERR_print_errors(out);
 187         EXIT(1);
 188         return(1);
 189         }
 190