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
74int main(int argc, char *argv[])
75	{
76	BN_CTX *ctx;
77	BIO *out=NULL;
78	int i,ret;
79	unsigned char c;
80	BIGNUM *r_mont,*r_mont_const,*r_recp,*r_simple,*a,*b,*m;
81
82	RAND_seed(rnd_seed, sizeof rnd_seed); /* or BN_rand may fail, and we don't
83	                                       * even check its return value
84	                                       * (which we should) */
85
86	ERR_load_BN_strings();
87
88	ctx=BN_CTX_new();
89	if (ctx == NULL) EXIT(1);
90	r_mont=BN_new();
91	r_mont_const=BN_new();
92	r_recp=BN_new();
93	r_simple=BN_new();
94	a=BN_new();
95	b=BN_new();
96	m=BN_new();
97	if (	(r_mont == NULL) || (r_recp == NULL) ||
98		(a == NULL) || (b == NULL))
99		goto err;
100
101	out=BIO_new(BIO_s_file());
102
103	if (out == NULL) EXIT(1);
104	BIO_set_fp(out,stdout,BIO_NOCLOSE);
105
106	for (i=0; i<200; i++)
107		{
108		RAND_bytes(&c,1);
109		c=(c%BN_BITS)-BN_BITS2;
110		BN_rand(a,NUM_BITS+c,0,0);
111
112		RAND_bytes(&c,1);
113		c=(c%BN_BITS)-BN_BITS2;
114		BN_rand(b,NUM_BITS+c,0,0);
115
116		RAND_bytes(&c,1);
117		c=(c%BN_BITS)-BN_BITS2;
118		BN_rand(m,NUM_BITS+c,0,1);
119
120		BN_mod(a,a,m,ctx);
121		BN_mod(b,b,m,ctx);
122
123		ret=BN_mod_exp_mont(r_mont,a,b,m,ctx,NULL);
124		if (ret <= 0)
125			{
126			printf("BN_mod_exp_mont() problems\n");
127			ERR_print_errors(out);
128			EXIT(1);
129			}
130
131		ret=BN_mod_exp_recp(r_recp,a,b,m,ctx);
132		if (ret <= 0)
133			{
134			printf("BN_mod_exp_recp() problems\n");
135			ERR_print_errors(out);
136			EXIT(1);
137			}
138
139		ret=BN_mod_exp_simple(r_simple,a,b,m,ctx);
140		if (ret <= 0)
141			{
142			printf("BN_mod_exp_simple() problems\n");
143			ERR_print_errors(out);
144			EXIT(1);
145			}
146
147		ret=BN_mod_exp_mont_consttime(r_mont_const,a,b,m,ctx,NULL);
148		if (ret <= 0)
149			{
150			printf("BN_mod_exp_mont_consttime() problems\n");
151			ERR_print_errors(out);
152			EXIT(1);
153			}
154
155		if (BN_cmp(r_simple, r_mont) == 0
156		    && BN_cmp(r_simple,r_recp) == 0
157			&& BN_cmp(r_simple,r_mont_const) == 0)
158			{
159			printf(".");
160			fflush(stdout);
161			}
162		else
163		  	{
164			if (BN_cmp(r_simple,r_mont) != 0)
165				printf("\nsimple and mont results differ\n");
166			if (BN_cmp(r_simple,r_mont_const) != 0)
167				printf("\nsimple and mont const time results differ\n");
168			if (BN_cmp(r_simple,r_recp) != 0)
169				printf("\nsimple and recp results differ\n");
170
171			printf("a (%3d) = ",BN_num_bits(a));   BN_print(out,a);
172			printf("\nb (%3d) = ",BN_num_bits(b)); BN_print(out,b);
173			printf("\nm (%3d) = ",BN_num_bits(m)); BN_print(out,m);
174			printf("\nsimple   =");	BN_print(out,r_simple);
175			printf("\nrecp     =");	BN_print(out,r_recp);
176			printf("\nmont     ="); BN_print(out,r_mont);
177			printf("\nmont_ct  ="); BN_print(out,r_mont_const);
178			printf("\n");
179			EXIT(1);
180			}
181		}
182	BN_free(r_mont);
183	BN_free(r_mont_const);
184	BN_free(r_recp);
185	BN_free(r_simple);
186	BN_free(a);
187	BN_free(b);
188	BN_free(m);
189	BN_CTX_free(ctx);
190	ERR_remove_thread_state(NULL);
191	CRYPTO_mem_leaks(out);
192	BIO_free(out);
193	printf(" done\n");
194	EXIT(0);
195err:
196	ERR_load_crypto_strings();
197	ERR_print_errors(out);
198#ifdef OPENSSL_SYS_NETWARE
199    printf("ERROR\n");
200#endif
201	EXIT(1);
202	return(1);
203	}
204
205