exptest.c revision 296465
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[] = 73 "string to make the random number generator think it has entropy"; 74 75/* 76 * Disabled for FIPS capable builds because they use the FIPS BIGNUM library 77 * which will fail this test. 78 */ 79#ifndef OPENSSL_FIPS 80/* 81 * test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success. 82 */ 83static int test_exp_mod_zero() 84{ 85 BIGNUM a, p, m; 86 BIGNUM r; 87 BN_CTX *ctx = BN_CTX_new(); 88 int ret = 1; 89 90 BN_init(&m); 91 BN_one(&m); 92 93 BN_init(&a); 94 BN_one(&a); 95 96 BN_init(&p); 97 BN_zero(&p); 98 99 BN_init(&r); 100 BN_mod_exp(&r, &a, &p, &m, ctx); 101 BN_CTX_free(ctx); 102 103 if (BN_is_zero(&r)) 104 ret = 0; 105 else { 106 printf("1**0 mod 1 = "); 107 BN_print_fp(stdout, &r); 108 printf(", should be 0\n"); 109 } 110 111 BN_free(&r); 112 BN_free(&a); 113 BN_free(&p); 114 BN_free(&m); 115 116 return ret; 117} 118#endif 119int main(int argc, char *argv[]) 120{ 121 BN_CTX *ctx; 122 BIO *out = NULL; 123 int i, ret; 124 unsigned char c; 125 BIGNUM *r_mont, *r_mont_const, *r_recp, *r_simple, *a, *b, *m; 126 127 RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we 128 * don't even check its return 129 * value (which we should) */ 130 131 ERR_load_BN_strings(); 132 133 ctx = BN_CTX_new(); 134 if (ctx == NULL) 135 EXIT(1); 136 r_mont = BN_new(); 137 r_mont_const = BN_new(); 138 r_recp = BN_new(); 139 r_simple = BN_new(); 140 a = BN_new(); 141 b = BN_new(); 142 m = BN_new(); 143 if ((r_mont == NULL) || (r_recp == NULL) || (a == NULL) || (b == NULL)) 144 goto err; 145 146 out = BIO_new(BIO_s_file()); 147 148 if (out == NULL) 149 EXIT(1); 150 BIO_set_fp(out, stdout, BIO_NOCLOSE); 151 152 for (i = 0; i < 200; i++) { 153 RAND_bytes(&c, 1); 154 c = (c % BN_BITS) - BN_BITS2; 155 BN_rand(a, NUM_BITS + c, 0, 0); 156 157 RAND_bytes(&c, 1); 158 c = (c % BN_BITS) - BN_BITS2; 159 BN_rand(b, NUM_BITS + c, 0, 0); 160 161 RAND_bytes(&c, 1); 162 c = (c % BN_BITS) - BN_BITS2; 163 BN_rand(m, NUM_BITS + c, 0, 1); 164 165 BN_mod(a, a, m, ctx); 166 BN_mod(b, b, m, ctx); 167 168 ret = BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL); 169 if (ret <= 0) { 170 printf("BN_mod_exp_mont() problems\n"); 171 ERR_print_errors(out); 172 EXIT(1); 173 } 174 175 ret = BN_mod_exp_recp(r_recp, a, b, m, ctx); 176 if (ret <= 0) { 177 printf("BN_mod_exp_recp() problems\n"); 178 ERR_print_errors(out); 179 EXIT(1); 180 } 181 182 ret = BN_mod_exp_simple(r_simple, a, b, m, ctx); 183 if (ret <= 0) { 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 printf("BN_mod_exp_mont_consttime() problems\n"); 192 ERR_print_errors(out); 193 EXIT(1); 194 } 195 196 if (BN_cmp(r_simple, r_mont) == 0 197 && BN_cmp(r_simple, r_recp) == 0 198 && BN_cmp(r_simple, r_mont_const) == 0) { 199 printf("."); 200 fflush(stdout); 201 } else { 202 if (BN_cmp(r_simple, r_mont) != 0) 203 printf("\nsimple and mont results differ\n"); 204 if (BN_cmp(r_simple, r_mont) != 0) 205 printf("\nsimple and mont const time results differ\n"); 206 if (BN_cmp(r_simple, r_recp) != 0) 207 printf("\nsimple and recp results differ\n"); 208 209 printf("a (%3d) = ", BN_num_bits(a)); 210 BN_print(out, a); 211 printf("\nb (%3d) = ", BN_num_bits(b)); 212 BN_print(out, b); 213 printf("\nm (%3d) = ", BN_num_bits(m)); 214 BN_print(out, m); 215 printf("\nsimple ="); 216 BN_print(out, r_simple); 217 printf("\nrecp ="); 218 BN_print(out, r_recp); 219 printf("\nmont ="); 220 BN_print(out, r_mont); 221 printf("\nmont_ct ="); 222 BN_print(out, r_mont_const); 223 printf("\n"); 224 EXIT(1); 225 } 226 } 227 BN_free(r_mont); 228 BN_free(r_mont_const); 229 BN_free(r_recp); 230 BN_free(r_simple); 231 BN_free(a); 232 BN_free(b); 233 BN_free(m); 234 BN_CTX_free(ctx); 235 ERR_remove_state(0); 236 CRYPTO_mem_leaks(out); 237 BIO_free(out); 238 printf("\n"); 239#ifndef OPENSSL_FIPS 240 if (test_exp_mod_zero() != 0) 241 goto err; 242#endif 243 printf("done\n"); 244 245 EXIT(0); 246 err: 247 ERR_load_crypto_strings(); 248 ERR_print_errors(out); 249#ifdef OPENSSL_SYS_NETWARE 250 printf("ERROR\n"); 251#endif 252 EXIT(1); 253 return (1); 254} 255