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 return &ret;
118 #endif
119 }
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
132
ec_GFp_mont_group_finish(EC_GROUP * group)133 void ec_GFp_mont_group_finish(EC_GROUP *group)
134 {
135 if (group->field_data1 != NULL)
136 {
137 BN_MONT_CTX_free(group->field_data1);
138 group->field_data1 = NULL;
139 }
140 if (group->field_data2 != NULL)
141 {
142 BN_free(group->field_data2);
143 group->field_data2 = NULL;
144 }
145 ec_GFp_simple_group_finish(group);
146 }
147
148
ec_GFp_mont_group_clear_finish(EC_GROUP * group)149 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
150 {
151 if (group->field_data1 != NULL)
152 {
153 BN_MONT_CTX_free(group->field_data1);
154 group->field_data1 = NULL;
155 }
156 if (group->field_data2 != NULL)
157 {
158 BN_clear_free(group->field_data2);
159 group->field_data2 = NULL;
160 }
161 ec_GFp_simple_group_clear_finish(group);
162 }
163
164
ec_GFp_mont_group_copy(EC_GROUP * dest,const EC_GROUP * src)165 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
166 {
167 if (dest->field_data1 != NULL)
168 {
169 BN_MONT_CTX_free(dest->field_data1);
170 dest->field_data1 = NULL;
171 }
172 if (dest->field_data2 != NULL)
173 {
174 BN_clear_free(dest->field_data2);
175 dest->field_data2 = NULL;
176 }
177
178 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
179
180 if (src->field_data1 != NULL)
181 {
182 dest->field_data1 = BN_MONT_CTX_new();
183 if (dest->field_data1 == NULL) return 0;
184 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
185 }
186 if (src->field_data2 != NULL)
187 {
188 dest->field_data2 = BN_dup(src->field_data2);
189 if (dest->field_data2 == NULL) goto err;
190 }
191
192 return 1;
193
194 err:
195 if (dest->field_data1 != NULL)
196 {
197 BN_MONT_CTX_free(dest->field_data1);
198 dest->field_data1 = NULL;
199 }
200 return 0;
201 }
202
203
ec_GFp_mont_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)204 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
205 {
206 BN_CTX *new_ctx = NULL;
207 BN_MONT_CTX *mont = NULL;
208 BIGNUM *one = NULL;
209 int ret = 0;
210
211 if (group->field_data1 != NULL)
212 {
213 BN_MONT_CTX_free(group->field_data1);
214 group->field_data1 = NULL;
215 }
216 if (group->field_data2 != NULL)
217 {
218 BN_free(group->field_data2);
219 group->field_data2 = NULL;
220 }
221
222 if (ctx == NULL)
223 {
224 ctx = new_ctx = BN_CTX_new();
225 if (ctx == NULL)
226 return 0;
227 }
228
229 mont = BN_MONT_CTX_new();
230 if (mont == NULL) goto err;
231 if (!BN_MONT_CTX_set(mont, p, ctx))
232 {
233 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
234 goto err;
235 }
236 one = BN_new();
237 if (one == NULL) goto err;
238 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
239
240 group->field_data1 = mont;
241 mont = NULL;
242 group->field_data2 = one;
243 one = NULL;
244
245 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
246
247 if (!ret)
248 {
249 BN_MONT_CTX_free(group->field_data1);
250 group->field_data1 = NULL;
251 BN_free(group->field_data2);
252 group->field_data2 = NULL;
253 }
254
255 err:
256 if (new_ctx != NULL)
257 BN_CTX_free(new_ctx);
258 if (mont != NULL)
259 BN_MONT_CTX_free(mont);
260 return ret;
261 }
262
263
ec_GFp_mont_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)264 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
265 {
266 if (group->field_data1 == NULL)
267 {
268 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
269 return 0;
270 }
271
272 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
273 }
274
275
ec_GFp_mont_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)276 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
277 {
278 if (group->field_data1 == NULL)
279 {
280 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
281 return 0;
282 }
283
284 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
285 }
286
287
ec_GFp_mont_field_encode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)288 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
289 {
290 if (group->field_data1 == NULL)
291 {
292 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
293 return 0;
294 }
295
296 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
297 }
298
299
ec_GFp_mont_field_decode(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)300 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
301 {
302 if (group->field_data1 == NULL)
303 {
304 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
305 return 0;
306 }
307
308 return BN_from_montgomery(r, a, group->field_data1, ctx);
309 }
310
311
ec_GFp_mont_field_set_to_one(const EC_GROUP * group,BIGNUM * r,BN_CTX * ctx)312 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
313 {
314 if (group->field_data2 == NULL)
315 {
316 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
317 return 0;
318 }
319
320 if (!BN_copy(r, group->field_data2)) return 0;
321 return 1;
322 }
323