exptest.c revision 296341
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 * test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success. 77 */ 78static int test_exp_mod_zero() 79{ 80 BIGNUM a, p, m; 81 BIGNUM r; 82 BN_CTX *ctx = BN_CTX_new(); 83 int ret = 1; 84 85 BN_init(&m); 86 BN_one(&m); 87 88 BN_init(&a); 89 BN_one(&a); 90 91 BN_init(&p); 92 BN_zero(&p); 93 94 BN_init(&r); 95 BN_mod_exp(&r, &a, &p, &m, ctx); 96 BN_CTX_free(ctx); 97 98 if (BN_is_zero(&r)) 99 ret = 0; 100 else { 101 printf("1**0 mod 1 = "); 102 BN_print_fp(stdout, &r); 103 printf(", should be 0\n"); 104 } 105 106 BN_free(&r); 107 BN_free(&a); 108 BN_free(&p); 109 BN_free(&m); 110 111 return ret; 112} 113 114int main(int argc, char *argv[]) 115{ 116 BN_CTX *ctx; 117 BIO *out = NULL; 118 int i, ret; 119 unsigned char c; 120 BIGNUM *r_mont, *r_mont_const, *r_recp, *r_simple, *a, *b, *m; 121 122 RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we 123 * don't even check its return 124 * value (which we should) */ 125 126 ERR_load_BN_strings(); 127 128 ctx = BN_CTX_new(); 129 if (ctx == NULL) 130 EXIT(1); 131 r_mont = BN_new(); 132 r_mont_const = BN_new(); 133 r_recp = BN_new(); 134 r_simple = BN_new(); 135 a = BN_new(); 136 b = BN_new(); 137 m = BN_new(); 138 if ((r_mont == NULL) || (r_recp == NULL) || (a == NULL) || (b == NULL)) 139 goto err; 140 141 out = BIO_new(BIO_s_file()); 142 143 if (out == NULL) 144 EXIT(1); 145 BIO_set_fp(out, stdout, BIO_NOCLOSE); 146 147 for (i = 0; i < 200; i++) { 148 RAND_bytes(&c, 1); 149 c = (c % BN_BITS) - BN_BITS2; 150 BN_rand(a, NUM_BITS + c, 0, 0); 151 152 RAND_bytes(&c, 1); 153 c = (c % BN_BITS) - BN_BITS2; 154 BN_rand(b, NUM_BITS + c, 0, 0); 155 156 RAND_bytes(&c, 1); 157 c = (c % BN_BITS) - BN_BITS2; 158 BN_rand(m, NUM_BITS + c, 0, 1); 159 160 BN_mod(a, a, m, ctx); 161 BN_mod(b, b, m, ctx); 162 163 ret = BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL); 164 if (ret <= 0) { 165 printf("BN_mod_exp_mont() problems\n"); 166 ERR_print_errors(out); 167 EXIT(1); 168 } 169 170 ret = BN_mod_exp_recp(r_recp, a, b, m, ctx); 171 if (ret <= 0) { 172 printf("BN_mod_exp_recp() problems\n"); 173 ERR_print_errors(out); 174 EXIT(1); 175 } 176 177 ret = BN_mod_exp_simple(r_simple, a, b, m, ctx); 178 if (ret <= 0) { 179 printf("BN_mod_exp_simple() problems\n"); 180 ERR_print_errors(out); 181 EXIT(1); 182 } 183 184 ret = BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL); 185 if (ret <= 0) { 186 printf("BN_mod_exp_mont_consttime() problems\n"); 187 ERR_print_errors(out); 188 EXIT(1); 189 } 190 191 if (BN_cmp(r_simple, r_mont) == 0 192 && BN_cmp(r_simple, r_recp) == 0 193 && BN_cmp(r_simple, r_mont_const) == 0) { 194 printf("."); 195 fflush(stdout); 196 } else { 197 if (BN_cmp(r_simple, r_mont) != 0) 198 printf("\nsimple and mont results differ\n"); 199 if (BN_cmp(r_simple, r_mont_const) != 0) 200 printf("\nsimple and mont const time results differ\n"); 201 if (BN_cmp(r_simple, r_recp) != 0) 202 printf("\nsimple and recp results differ\n"); 203 204 printf("a (%3d) = ", BN_num_bits(a)); 205 BN_print(out, a); 206 printf("\nb (%3d) = ", BN_num_bits(b)); 207 BN_print(out, b); 208 printf("\nm (%3d) = ", BN_num_bits(m)); 209 BN_print(out, m); 210 printf("\nsimple ="); 211 BN_print(out, r_simple); 212 printf("\nrecp ="); 213 BN_print(out, r_recp); 214 printf("\nmont ="); 215 BN_print(out, r_mont); 216 printf("\nmont_ct ="); 217 BN_print(out, r_mont_const); 218 printf("\n"); 219 EXIT(1); 220 } 221 } 222 BN_free(r_mont); 223 BN_free(r_mont_const); 224 BN_free(r_recp); 225 BN_free(r_simple); 226 BN_free(a); 227 BN_free(b); 228 BN_free(m); 229 BN_CTX_free(ctx); 230 ERR_remove_thread_state(NULL); 231 CRYPTO_mem_leaks(out); 232 BIO_free(out); 233 printf("\n"); 234 235 if (test_exp_mod_zero() != 0) 236 goto err; 237 238 printf("done\n"); 239 240 EXIT(0); 241 err: 242 ERR_load_crypto_strings(); 243 ERR_print_errors(out); 244#ifdef OPENSSL_SYS_NETWARE 245 printf("ERROR\n"); 246#endif 247 EXIT(1); 248 return (1); 249} 250