exptest.c revision 279265
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 70#define NUM_BITS (BN_BITS*2) 71 72static const char rnd_seed[] = "string to make the random number generator think it has entropy"; 73 74/* 75 * Disabled for FIPS capable builds because they use the FIPS BIGNUM library 76 * which will fail this test. 77 */ 78#ifndef OPENSSL_FIPS 79/* test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success. */ 80static int test_exp_mod_zero() { 81 BIGNUM a, p, m; 82 BIGNUM r; 83 BN_CTX *ctx = BN_CTX_new(); 84 int ret = 1; 85 86 BN_init(&m); 87 BN_one(&m); 88 89 BN_init(&a); 90 BN_one(&a); 91 92 BN_init(&p); 93 BN_zero(&p); 94 95 BN_init(&r); 96 BN_mod_exp(&r, &a, &p, &m, ctx); 97 BN_CTX_free(ctx); 98 99 if (BN_is_zero(&r)) 100 ret = 0; 101 else 102 { 103 printf("1**0 mod 1 = "); 104 BN_print_fp(stdout, &r); 105 printf(", should be 0\n"); 106 } 107 108 BN_free(&r); 109 BN_free(&a); 110 BN_free(&p); 111 BN_free(&m); 112 113 return ret; 114} 115#endif 116int main(int argc, char *argv[]) 117 { 118 BN_CTX *ctx; 119 BIO *out=NULL; 120 int i,ret; 121 unsigned char c; 122 BIGNUM *r_mont,*r_mont_const,*r_recp,*r_simple,*a,*b,*m; 123 124 RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't 125 * even check its return value 126 * (which we should) */ 127 128 ERR_load_BN_strings(); 129 130 ctx=BN_CTX_new(); 131 if (ctx == NULL) EXIT(1); 132 r_mont=BN_new(); 133 r_mont_const=BN_new(); 134 r_recp=BN_new(); 135 r_simple=BN_new(); 136 a=BN_new(); 137 b=BN_new(); 138 m=BN_new(); 139 if ( (r_mont == NULL) || (r_recp == NULL) || 140 (a == NULL) || (b == NULL)) 141 goto err; 142 143 out=BIO_new(BIO_s_file()); 144 145 if (out == NULL) EXIT(1); 146 BIO_set_fp(out,stdout,BIO_NOCLOSE); 147 148 for (i=0; i<200; i++) 149 { 150 RAND_bytes(&c,1); 151 c=(c%BN_BITS)-BN_BITS2; 152 BN_rand(a,NUM_BITS+c,0,0); 153 154 RAND_bytes(&c,1); 155 c=(c%BN_BITS)-BN_BITS2; 156 BN_rand(b,NUM_BITS+c,0,0); 157 158 RAND_bytes(&c,1); 159 c=(c%BN_BITS)-BN_BITS2; 160 BN_rand(m,NUM_BITS+c,0,1); 161 162 BN_mod(a,a,m,ctx); 163 BN_mod(b,b,m,ctx); 164 165 ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL); 166 if (ret <= 0) 167 { 168 printf("BN_mod_exp_mont() problems\n"); 169 ERR_print_errors(out); 170 EXIT(1); 171 } 172 173 ret=BN_mod_exp_recp(r_recp,a,b,m,ctx); 174 if (ret <= 0) 175 { 176 printf("BN_mod_exp_recp() problems\n"); 177 ERR_print_errors(out); 178 EXIT(1); 179 } 180 181 ret=BN_mod_exp_simple(r_simple,a,b,m,ctx); 182 if (ret <= 0) 183 { 184 printf("BN_mod_exp_simple() problems\n"); 185 ERR_print_errors(out); 186 EXIT(1); 187 } 188 189 ret=BN_mod_exp_mont_consttime(r_mont_const,a,b,m,ctx,NULL); 190 if (ret <= 0) 191 { 192 printf("BN_mod_exp_mont_consttime() problems\n"); 193 ERR_print_errors(out); 194 EXIT(1); 195 } 196 197 if (BN_cmp(r_simple, r_mont) == 0 198 && BN_cmp(r_simple,r_recp) == 0 199 && BN_cmp(r_simple,r_mont_const) == 0) 200 { 201 printf("."); 202 fflush(stdout); 203 } 204 else 205 { 206 if (BN_cmp(r_simple,r_mont) != 0) 207 printf("\nsimple and mont results differ\n"); 208 if (BN_cmp(r_simple,r_mont) != 0) 209 printf("\nsimple and mont const time results differ\n"); 210 if (BN_cmp(r_simple,r_recp) != 0) 211 printf("\nsimple and recp results differ\n"); 212 213 printf("a (%3d) = ",BN_num_bits(a)); BN_print(out,a); 214 printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b); 215 printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m); 216 printf("\nsimple ="); BN_print(out,r_simple); 217 printf("\nrecp ="); BN_print(out,r_recp); 218 printf("\nmont ="); BN_print(out,r_mont); 219 printf("\nmont_ct ="); BN_print(out,r_mont_const); 220 printf("\n"); 221 EXIT(1); 222 } 223 } 224 BN_free(r_mont); 225 BN_free(r_mont_const); 226 BN_free(r_recp); 227 BN_free(r_simple); 228 BN_free(a); 229 BN_free(b); 230 BN_free(m); 231 BN_CTX_free(ctx); 232 ERR_remove_state(0); 233 CRYPTO_mem_leaks(out); 234 BIO_free(out); 235 printf("\n"); 236#ifndef OPENSSL_FIPS 237 if (test_exp_mod_zero() != 0) 238 goto err; 239#endif 240 printf("done\n"); 241 242 EXIT(0); 243err: 244 ERR_load_crypto_strings(); 245 ERR_print_errors(out); 246#ifdef OPENSSL_SYS_NETWARE 247 printf("ERROR\n"); 248#endif 249 EXIT(1); 250 return(1); 251 } 252 253