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
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. */
test_exp_mod_zero()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
main(int argc,char * argv[])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