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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 
main(int argc,char * argv[])74 int 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);
195 err:
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