• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* crypto/ec/ecp_mont.c */
2 /*
3  * Originally written by Bodo Moeller for the OpenSSL project.
4  */
5 /* ====================================================================
6  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    openssl-core@openssl.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  *
53  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58 /* ====================================================================
59  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
60  * Portions of this software developed by SUN MICROSYSTEMS, INC.,
61  * and contributed to the OpenSSL project.
62  */
63 
64 #include <openssl/err.h>
65 
66 #ifdef OPENSSL_FIPS
67 #include <openssl/fips.h>
68 #endif
69 
70 #include "ec_lcl.h"
71 
72 
EC_GFp_mont_method(void)73 const EC_METHOD *EC_GFp_mont_method(void)
74 	{
75 #ifdef OPENSSL_FIPS
76 	return fips_ec_gfp_mont_method();
77 #else
78 	static const EC_METHOD ret = {
79 		EC_FLAGS_DEFAULT_OCT,
80 		NID_X9_62_prime_field,
81 		ec_GFp_mont_group_init,
82 		ec_GFp_mont_group_finish,
83 		ec_GFp_mont_group_clear_finish,
84 		ec_GFp_mont_group_copy,
85 		ec_GFp_mont_group_set_curve,
86 		ec_GFp_simple_group_get_curve,
87 		ec_GFp_simple_group_get_degree,
88 		ec_GFp_simple_group_check_discriminant,
89 		ec_GFp_simple_point_init,
90 		ec_GFp_simple_point_finish,
91 		ec_GFp_simple_point_clear_finish,
92 		ec_GFp_simple_point_copy,
93 		ec_GFp_simple_point_set_to_infinity,
94 		ec_GFp_simple_set_Jprojective_coordinates_GFp,
95 		ec_GFp_simple_get_Jprojective_coordinates_GFp,
96 		ec_GFp_simple_point_set_affine_coordinates,
97 		ec_GFp_simple_point_get_affine_coordinates,
98 		0,0,0,
99 		ec_GFp_simple_add,
100 		ec_GFp_simple_dbl,
101 		ec_GFp_simple_invert,
102 		ec_GFp_simple_is_at_infinity,
103 		ec_GFp_simple_is_on_curve,
104 		ec_GFp_simple_cmp,
105 		ec_GFp_simple_make_affine,
106 		ec_GFp_simple_points_make_affine,
107 		0 /* mul */,
108 		0 /* precompute_mult */,
109 		0 /* have_precompute_mult */,
110 		ec_GFp_mont_field_mul,
111 		ec_GFp_mont_field_sqr,
112 		0 /* field_div */,
113 		ec_GFp_mont_field_encode,
114 		ec_GFp_mont_field_decode,
115 		ec_GFp_mont_field_set_to_one };
116 
117 
118 	return &ret;
119 #endif
120 	}
121 
122 
ec_GFp_mont_group_init(EC_GROUP * group)123 int ec_GFp_mont_group_init(EC_GROUP *group)
124 	{
125 	int ok;
126 
127 	ok = ec_GFp_simple_group_init(group);
128 	group->field_data1 = NULL;
129 	group->field_data2 = NULL;
130 	return ok;
131 	}
132 
133 
ec_GFp_mont_group_finish(EC_GROUP * group)134 void ec_GFp_mont_group_finish(EC_GROUP *group)
135 	{
136 	if (group->field_data1 != NULL)
137 		{
138 		BN_MONT_CTX_free(group->field_data1);
139 		group->field_data1 = NULL;
140 		}
141 	if (group->field_data2 != NULL)
142 		{
143 		BN_free(group->field_data2);
144 		group->field_data2 = NULL;
145 		}
146 	ec_GFp_simple_group_finish(group);
147 	}
148 
149 
ec_GFp_mont_group_clear_finish(EC_GROUP * group)150 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
151 	{
152 	if (group->field_data1 != NULL)
153 		{
154 		BN_MONT_CTX_free(group->field_data1);
155 		group->field_data1 = NULL;
156 		}
157 	if (group->field_data2 != NULL)
158 		{
159 		BN_clear_free(group->field_data2);
160 		group->field_data2 = NULL;
161 		}
162 	ec_GFp_simple_group_clear_finish(group);
163 	}
164 
165 
ec_GFp_mont_group_copy(EC_GROUP * dest,const EC_GROUP * src)166 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
167 	{
168 	if (dest->field_data1 != NULL)
169 		{
170 		BN_MONT_CTX_free(dest->field_data1);
171 		dest->field_data1 = NULL;
172 		}
173 	if (dest->field_data2 != NULL)
174 		{
175 		BN_clear_free(dest->field_data2);
176 		dest->field_data2 = NULL;
177 		}
178 
179 	if (!ec_GFp_simple_group_copy(dest, src)) return 0;
180 
181 	if (src->field_data1 != NULL)
182 		{
183 		dest->field_data1 = BN_MONT_CTX_new();
184 		if (dest->field_data1 == NULL) return 0;
185 		if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
186 		}
187 	if (src->field_data2 != NULL)
188 		{
189 		dest->field_data2 = BN_dup(src->field_data2);
190 		if (dest->field_data2 == NULL) goto err;
191 		}
192 
193 	return 1;
194 
195  err:
196 	if (dest->field_data1 != NULL)
197 		{
198 		BN_MONT_CTX_free(dest->field_data1);
199 		dest->field_data1 = NULL;
200 		}
201 	return 0;
202 	}
203 
204 
ec_GFp_mont_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)205 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
206 	{
207 	BN_CTX *new_ctx = NULL;
208 	BN_MONT_CTX *mont = NULL;
209 	BIGNUM *one = NULL;
210 	int ret = 0;
211 
212 	if (group->field_data1 != NULL)
213 		{
214 		BN_MONT_CTX_free(group->field_data1);
215 		group->field_data1 = NULL;
216 		}
217 	if (group->field_data2 != NULL)
218 		{
219 		BN_free(group->field_data2);
220 		group->field_data2 = NULL;
221 		}
222 
223 	if (ctx == NULL)
224 		{
225 		ctx = new_ctx = BN_CTX_new();
226 		if (ctx == NULL)
227 			return 0;
228 		}
229 
230 	mont = BN_MONT_CTX_new();
231 	if (mont == NULL) goto err;
232 	if (!BN_MONT_CTX_set(mont, p, ctx))
233 		{
234 		ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
235 		goto err;
236 		}
237 	one = BN_new();
238 	if (one == NULL) goto err;
239 	if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
240 
241 	group->field_data1 = mont;
242 	mont = NULL;
243 	group->field_data2 = one;
244 	one = NULL;
245 
246 	ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
247 
248 	if (!ret)
249 		{
250 		BN_MONT_CTX_free(group->field_data1);
251 		group->field_data1 = NULL;
252 		BN_free(group->field_data2);
253 		group->field_data2 = NULL;
254 		}
255 
256  err:
257 	if (new_ctx != NULL)
258 		BN_CTX_free(new_ctx);
259 	if (mont != NULL)
260 		BN_MONT_CTX_free(mont);
261 	return ret;
262 	}
263 
264 
ec_GFp_mont_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)265 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
266 	{
267 	if (group->field_data1 == NULL)
268 		{
269 		ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
270 		return 0;
271 		}
272 
273 	return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
274 	}
275 
276 
ec_GFp_mont_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)277 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
278 	{
279 	if (group->field_data1 == NULL)
280 		{
281 		ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
282 		return 0;
283 		}
284 
285 	return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
286 	}
287 
288 
ec_GFp_mont_field_encode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)289 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
290 	{
291 	if (group->field_data1 == NULL)
292 		{
293 		ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
294 		return 0;
295 		}
296 
297 	return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
298 	}
299 
300 
ec_GFp_mont_field_decode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)301 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
302 	{
303 	if (group->field_data1 == NULL)
304 		{
305 		ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
306 		return 0;
307 		}
308 
309 	return BN_from_montgomery(r, a, group->field_data1, ctx);
310 	}
311 
312 
ec_GFp_mont_field_set_to_one(const EC_GROUP * group,BIGNUM * r,BN_CTX * ctx)313 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
314 	{
315 	if (group->field_data2 == NULL)
316 		{
317 		ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
318 		return 0;
319 		}
320 
321 	if (!BN_copy(r, group->field_data2)) return 0;
322 	return 1;
323 	}
324