Line data Source code
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 0 : 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 0 : return &ret;
120 : }
121 :
122 0 : int ec_GFp_mont_group_init(EC_GROUP *group)
123 : {
124 : int ok;
125 :
126 0 : ok = ec_GFp_simple_group_init(group);
127 0 : group->field_data1 = NULL;
128 0 : group->field_data2 = NULL;
129 0 : return ok;
130 : }
131 :
132 0 : void ec_GFp_mont_group_finish(EC_GROUP *group)
133 : {
134 0 : if (group->field_data1 != NULL) {
135 0 : BN_MONT_CTX_free(group->field_data1);
136 0 : group->field_data1 = NULL;
137 : }
138 0 : if (group->field_data2 != NULL) {
139 0 : BN_free(group->field_data2);
140 0 : group->field_data2 = NULL;
141 : }
142 0 : ec_GFp_simple_group_finish(group);
143 0 : }
144 :
145 0 : void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
146 : {
147 0 : if (group->field_data1 != NULL) {
148 0 : BN_MONT_CTX_free(group->field_data1);
149 0 : group->field_data1 = NULL;
150 : }
151 0 : if (group->field_data2 != NULL) {
152 0 : BN_clear_free(group->field_data2);
153 0 : group->field_data2 = NULL;
154 : }
155 0 : ec_GFp_simple_group_clear_finish(group);
156 0 : }
157 :
158 0 : int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
159 : {
160 0 : if (dest->field_data1 != NULL) {
161 0 : BN_MONT_CTX_free(dest->field_data1);
162 0 : dest->field_data1 = NULL;
163 : }
164 0 : if (dest->field_data2 != NULL) {
165 0 : BN_clear_free(dest->field_data2);
166 0 : dest->field_data2 = NULL;
167 : }
168 :
169 0 : if (!ec_GFp_simple_group_copy(dest, src))
170 : return 0;
171 :
172 0 : if (src->field_data1 != NULL) {
173 0 : dest->field_data1 = BN_MONT_CTX_new();
174 0 : if (dest->field_data1 == NULL)
175 : return 0;
176 0 : if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
177 : goto err;
178 : }
179 0 : if (src->field_data2 != NULL) {
180 0 : dest->field_data2 = BN_dup(src->field_data2);
181 0 : if (dest->field_data2 == NULL)
182 : goto err;
183 : }
184 :
185 : return 1;
186 :
187 : err:
188 0 : if (dest->field_data1 != NULL) {
189 0 : BN_MONT_CTX_free(dest->field_data1);
190 0 : dest->field_data1 = NULL;
191 : }
192 : return 0;
193 : }
194 :
195 0 : 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 0 : if (group->field_data1 != NULL) {
204 0 : BN_MONT_CTX_free(group->field_data1);
205 0 : group->field_data1 = NULL;
206 : }
207 0 : if (group->field_data2 != NULL) {
208 0 : BN_free(group->field_data2);
209 0 : group->field_data2 = NULL;
210 : }
211 :
212 0 : if (ctx == NULL) {
213 0 : ctx = new_ctx = BN_CTX_new();
214 0 : if (ctx == NULL)
215 : return 0;
216 : }
217 :
218 0 : mont = BN_MONT_CTX_new();
219 0 : if (mont == NULL)
220 : goto err;
221 0 : if (!BN_MONT_CTX_set(mont, p, ctx)) {
222 0 : ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
223 0 : goto err;
224 : }
225 0 : one = BN_new();
226 0 : if (one == NULL)
227 : goto err;
228 0 : if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
229 : goto err;
230 :
231 0 : group->field_data1 = mont;
232 : mont = NULL;
233 0 : group->field_data2 = one;
234 : one = NULL;
235 :
236 0 : ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
237 :
238 0 : if (!ret) {
239 0 : BN_MONT_CTX_free(group->field_data1);
240 0 : group->field_data1 = NULL;
241 0 : BN_free(group->field_data2);
242 0 : group->field_data2 = NULL;
243 : }
244 :
245 : err:
246 0 : if (new_ctx != NULL)
247 0 : BN_CTX_free(new_ctx);
248 0 : if (mont != NULL)
249 0 : BN_MONT_CTX_free(mont);
250 0 : return ret;
251 : }
252 :
253 0 : int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
254 : const BIGNUM *b, BN_CTX *ctx)
255 : {
256 0 : if (group->field_data1 == NULL) {
257 0 : ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
258 0 : return 0;
259 : }
260 :
261 0 : return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
262 : }
263 :
264 0 : int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
265 : BN_CTX *ctx)
266 : {
267 0 : if (group->field_data1 == NULL) {
268 0 : ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
269 0 : return 0;
270 : }
271 :
272 0 : return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
273 : }
274 :
275 0 : int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r,
276 : const BIGNUM *a, BN_CTX *ctx)
277 : {
278 0 : if (group->field_data1 == NULL) {
279 0 : ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
280 0 : return 0;
281 : }
282 :
283 0 : return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
284 : }
285 :
286 0 : int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r,
287 : const BIGNUM *a, BN_CTX *ctx)
288 : {
289 0 : if (group->field_data1 == NULL) {
290 0 : ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
291 0 : return 0;
292 : }
293 :
294 0 : return BN_from_montgomery(r, a, group->field_data1, ctx);
295 : }
296 :
297 0 : int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
298 : BN_CTX *ctx)
299 : {
300 0 : if (group->field_data2 == NULL) {
301 0 : ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
302 0 : return 0;
303 : }
304 :
305 0 : if (!BN_copy(r, group->field_data2))
306 : return 0;
307 0 : return 1;
308 : }
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