1 /* crypto/bn/exptest.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 72 static const char rnd_seed[] = "string to make the random number generator think it has entropy"; 73 74 /* test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success. */ 75 static int test_exp_mod_zero() { 76 BIGNUM a, p, m; 77 BIGNUM r; 78 BN_CTX *ctx = BN_CTX_new(); 79 int ret = 1; 80 81 BN_init(&m); 82 BN_one(&m); 83 84 BN_init(&a); 85 BN_one(&a); 86 87 BN_init(&p); 88 BN_zero(&p); 89 90 BN_init(&r); 91 BN_mod_exp(&r, &a, &p, &m, ctx); 92 BN_CTX_free(ctx); 93 94 if (BN_is_zero(&r)) 95 ret = 0; 96 else 97 { 98 printf("1**0 mod 1 = "); 99 BN_print_fp(stdout, &r); 100 printf(", should be 0\n"); 101 } 102 103 BN_free(&r); 104 BN_free(&a); 105 BN_free(&p); 106 BN_free(&m); 107 108 return ret; 109 } 110 111 int main(int argc, char *argv[]) 112 { 113 BN_CTX *ctx; 114 BIO *out=NULL; 115 int i,ret; 116 unsigned char c; 117 BIGNUM *r_mont,*r_mont_const,*r_recp,*r_simple,*a,*b,*m; 118 119 RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't 120 * even check its return value 121 * (which we should) */ 122 123 ERR_load_BN_strings(); 124 125 ctx=BN_CTX_new(); 126 if (ctx == NULL) EXIT(1); 127 r_mont=BN_new(); 128 r_mont_const=BN_new(); 129 r_recp=BN_new(); 130 r_simple=BN_new(); 131 a=BN_new(); 132 b=BN_new(); 133 m=BN_new(); 134 if ( (r_mont == NULL) || (r_recp == NULL) || 135 (a == NULL) || (b == NULL)) 136 goto err; 137 138 out=BIO_new(BIO_s_file()); 139 140 if (out == NULL) EXIT(1); 141 BIO_set_fp(out,stdout,BIO_NOCLOSE); 142 143 for (i=0; i<200; i++) 144 { 145 RAND_bytes(&c,1); 146 c=(c%BN_BITS)-BN_BITS2; 147 BN_rand(a,NUM_BITS+c,0,0); 148 149 RAND_bytes(&c,1); 150 c=(c%BN_BITS)-BN_BITS2; 151 BN_rand(b,NUM_BITS+c,0,0); 152 153 RAND_bytes(&c,1); 154 c=(c%BN_BITS)-BN_BITS2; 155 BN_rand(m,NUM_BITS+c,0,1); 156 157 BN_mod(a,a,m,ctx); 158 BN_mod(b,b,m,ctx); 159 160 ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL); 161 if (ret <= 0) 162 { 163 printf("BN_mod_exp_mont() problems\n"); 164 ERR_print_errors(out); 165 EXIT(1); 166 } 167 168 ret=BN_mod_exp_recp(r_recp,a,b,m,ctx); 169 if (ret <= 0) 170 { 171 printf("BN_mod_exp_recp() problems\n"); 172 ERR_print_errors(out); 173 EXIT(1); 174 } 175 176 ret=BN_mod_exp_simple(r_simple,a,b,m,ctx); 177 if (ret <= 0) 178 { 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 { 187 printf("BN_mod_exp_mont_consttime() problems\n"); 188 ERR_print_errors(out); 189 EXIT(1); 190 } 191 192 if (BN_cmp(r_simple, r_mont) == 0 193 && BN_cmp(r_simple,r_recp) == 0 194 && BN_cmp(r_simple,r_mont_const) == 0) 195 { 196 printf("."); 197 fflush(stdout); 198 } 199 else 200 { 201 if (BN_cmp(r_simple,r_mont) != 0) 202 printf("\nsimple and mont results differ\n"); 203 if (BN_cmp(r_simple,r_mont_const) != 0) 204 printf("\nsimple and mont const time results differ\n"); 205 if (BN_cmp(r_simple,r_recp) != 0) 206 printf("\nsimple and recp results differ\n"); 207 208 printf("a (%3d) = ",BN_num_bits(a)); BN_print(out,a); 209 printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b); 210 printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m); 211 printf("\nsimple ="); BN_print(out,r_simple); 212 printf("\nrecp ="); BN_print(out,r_recp); 213 printf("\nmont ="); BN_print(out,r_mont); 214 printf("\nmont_ct ="); BN_print(out,r_mont_const); 215 printf("\n"); 216 EXIT(1); 217 } 218 } 219 BN_free(r_mont); 220 BN_free(r_mont_const); 221 BN_free(r_recp); 222 BN_free(r_simple); 223 BN_free(a); 224 BN_free(b); 225 BN_free(m); 226 BN_CTX_free(ctx); 227 ERR_remove_thread_state(NULL); 228 CRYPTO_mem_leaks(out); 229 BIO_free(out); 230 printf("\n"); 231 232 if (test_exp_mod_zero() != 0) 233 goto err; 234 235 printf("done\n"); 236 237 EXIT(0); 238 err: 239 ERR_load_crypto_strings(); 240 ERR_print_errors(out); 241 #ifdef OPENSSL_SYS_NETWARE 242 printf("ERROR\n"); 243 #endif 244 EXIT(1); 245 return(1); 246 } 247 248
