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
EC_GFp_mont_method(void)72 const EC_METHOD *EC_GFp_mont_method(void)
73 {
74 static const EC_METHOD ret = {
75 EC_FLAGS_DEFAULT_OCT,
76 NID_X9_62_prime_field,
77 ec_GFp_mont_group_init,
78 ec_GFp_mont_group_finish,
79 ec_GFp_mont_group_clear_finish,
80 ec_GFp_mont_group_copy,
81 ec_GFp_mont_group_set_curve,
82 ec_GFp_simple_group_get_curve,
83 ec_GFp_simple_group_get_degree,
84 ec_GFp_simple_group_check_discriminant,
85 ec_GFp_simple_point_init,
86 ec_GFp_simple_point_finish,
87 ec_GFp_simple_point_clear_finish,
88 ec_GFp_simple_point_copy,
89 ec_GFp_simple_point_set_to_infinity,
90 ec_GFp_simple_set_Jprojective_coordinates_GFp,
91 ec_GFp_simple_get_Jprojective_coordinates_GFp,
92 ec_GFp_simple_point_set_affine_coordinates,
93 ec_GFp_simple_point_get_affine_coordinates,
94 0, 0, 0,
95 ec_GFp_simple_add,
96 ec_GFp_simple_dbl,
97 ec_GFp_simple_invert,
98 ec_GFp_simple_is_at_infinity,
99 ec_GFp_simple_is_on_curve,
100 ec_GFp_simple_cmp,
101 ec_GFp_simple_make_affine,
102 ec_GFp_simple_points_make_affine,
103 0 /* mul */ ,
104 0 /* precompute_mult */ ,
105 0 /* have_precompute_mult */ ,
106 ec_GFp_mont_field_mul,
107 ec_GFp_mont_field_sqr,
108 0 /* field_div */ ,
109 ec_GFp_mont_field_encode,
110 ec_GFp_mont_field_decode,
111 ec_GFp_mont_field_set_to_one
112 };
113
114 #ifdef OPENSSL_FIPS
115 if (FIPS_mode())
116 return fips_ec_gfp_mont_method();
117 #endif
118
119 return &ret;
120 }
121
ec_GFp_mont_group_init(EC_GROUP * group)122 int ec_GFp_mont_group_init(EC_GROUP *group)
123 {
124 int ok;
125
126 ok = ec_GFp_simple_group_init(group);
127 group->field_data1 = NULL;
128 group->field_data2 = NULL;
129 return ok;
130 }
131
ec_GFp_mont_group_finish(EC_GROUP * group)132 void ec_GFp_mont_group_finish(EC_GROUP *group)
133 {
134 if (group->field_data1 != NULL) {
135 BN_MONT_CTX_free(group->field_data1);
136 group->field_data1 = NULL;
137 }
138 if (group->field_data2 != NULL) {
139 BN_free(group->field_data2);
140 group->field_data2 = NULL;
141 }
142 ec_GFp_simple_group_finish(group);
143 }
144
ec_GFp_mont_group_clear_finish(EC_GROUP * group)145 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
146 {
147 if (group->field_data1 != NULL) {
148 BN_MONT_CTX_free(group->field_data1);
149 group->field_data1 = NULL;
150 }
151 if (group->field_data2 != NULL) {
152 BN_clear_free(group->field_data2);
153 group->field_data2 = NULL;
154 }
155 ec_GFp_simple_group_clear_finish(group);
156 }
157
ec_GFp_mont_group_copy(EC_GROUP * dest,const EC_GROUP * src)158 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
159 {
160 if (dest->field_data1 != NULL) {
161 BN_MONT_CTX_free(dest->field_data1);
162 dest->field_data1 = NULL;
163 }
164 if (dest->field_data2 != NULL) {
165 BN_clear_free(dest->field_data2);
166 dest->field_data2 = NULL;
167 }
168
169 if (!ec_GFp_simple_group_copy(dest, src))
170 return 0;
171
172 if (src->field_data1 != NULL) {
173 dest->field_data1 = BN_MONT_CTX_new();
174 if (dest->field_data1 == NULL)
175 return 0;
176 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
177 goto err;
178 }
179 if (src->field_data2 != NULL) {
180 dest->field_data2 = BN_dup(src->field_data2);
181 if (dest->field_data2 == NULL)
182 goto err;
183 }
184
185 return 1;
186
187 err:
188 if (dest->field_data1 != NULL) {
189 BN_MONT_CTX_free(dest->field_data1);
190 dest->field_data1 = NULL;
191 }
192 return 0;
193 }
194
ec_GFp_mont_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)195 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p,
196 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
197 {
198 BN_CTX *new_ctx = NULL;
199 BN_MONT_CTX *mont = NULL;
200 BIGNUM *one = NULL;
201 int ret = 0;
202
203 if (group->field_data1 != NULL) {
204 BN_MONT_CTX_free(group->field_data1);
205 group->field_data1 = NULL;
206 }
207 if (group->field_data2 != NULL) {
208 BN_free(group->field_data2);
209 group->field_data2 = NULL;
210 }
211
212 if (ctx == NULL) {
213 ctx = new_ctx = BN_CTX_new();
214 if (ctx == NULL)
215 return 0;
216 }
217
218 mont = BN_MONT_CTX_new();
219 if (mont == NULL)
220 goto err;
221 if (!BN_MONT_CTX_set(mont, p, ctx)) {
222 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
223 goto err;
224 }
225 one = BN_new();
226 if (one == NULL)
227 goto err;
228 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
229 goto err;
230
231 group->field_data1 = mont;
232 mont = NULL;
233 group->field_data2 = one;
234 one = NULL;
235
236 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
237
238 if (!ret) {
239 BN_MONT_CTX_free(group->field_data1);
240 group->field_data1 = NULL;
241 BN_free(group->field_data2);
242 group->field_data2 = NULL;
243 }
244
245 err:
246 if (new_ctx != NULL)
247 BN_CTX_free(new_ctx);
248 if (mont != NULL)
249 BN_MONT_CTX_free(mont);
250 return ret;
251 }
252
ec_GFp_mont_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)253 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
254 const BIGNUM *b, BN_CTX *ctx)
255 {
256 if (group->field_data1 == NULL) {
257 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
258 return 0;
259 }
260
261 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
262 }
263
ec_GFp_mont_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)264 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
265 BN_CTX *ctx)
266 {
267 if (group->field_data1 == NULL) {
268 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
269 return 0;
270 }
271
272 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
273 }
274
ec_GFp_mont_field_encode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)275 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r,
276 const BIGNUM *a, BN_CTX *ctx)
277 {
278 if (group->field_data1 == NULL) {
279 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
280 return 0;
281 }
282
283 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
284 }
285
ec_GFp_mont_field_decode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)286 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r,
287 const BIGNUM *a, BN_CTX *ctx)
288 {
289 if (group->field_data1 == NULL) {
290 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
291 return 0;
292 }
293
294 return BN_from_montgomery(r, a, group->field_data1, ctx);
295 }
296
ec_GFp_mont_field_set_to_one(const EC_GROUP * group,BIGNUM * r,BN_CTX * ctx)297 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
298 BN_CTX *ctx)
299 {
300 if (group->field_data2 == NULL) {
301 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
302 return 0;
303 }
304
305 if (!BN_copy(r, group->field_data2))
306 return 0;
307 return 1;
308 }
309