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diff --git a/src/lib/libcrypto/ec/ecp_mont.c b/src/lib/libcrypto/ec/ecp_mont.c
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1/* $OpenBSD: ecp_mont.c,v 1.10 2015/02/13 00:46:03 beck Exp $ */
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#include "ec_lcl.h"
67
68
69const EC_METHOD *
70EC_GFp_mont_method(void)
71{
72 static const EC_METHOD ret = {
73 .flags = EC_FLAGS_DEFAULT_OCT,
74 .field_type = NID_X9_62_prime_field,
75 .group_init = ec_GFp_mont_group_init,
76 .group_finish = ec_GFp_mont_group_finish,
77 .group_clear_finish = ec_GFp_mont_group_clear_finish,
78 .group_copy = ec_GFp_mont_group_copy,
79 .group_set_curve = ec_GFp_mont_group_set_curve,
80 .group_get_curve = ec_GFp_simple_group_get_curve,
81 .group_get_degree = ec_GFp_simple_group_get_degree,
82 .group_check_discriminant =
83 ec_GFp_simple_group_check_discriminant,
84 .point_init = ec_GFp_simple_point_init,
85 .point_finish = ec_GFp_simple_point_finish,
86 .point_clear_finish = ec_GFp_simple_point_clear_finish,
87 .point_copy = ec_GFp_simple_point_copy,
88 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
89 .point_set_Jprojective_coordinates_GFp =
90 ec_GFp_simple_set_Jprojective_coordinates_GFp,
91 .point_get_Jprojective_coordinates_GFp =
92 ec_GFp_simple_get_Jprojective_coordinates_GFp,
93 .point_set_affine_coordinates =
94 ec_GFp_simple_point_set_affine_coordinates,
95 .point_get_affine_coordinates =
96 ec_GFp_simple_point_get_affine_coordinates,
97 .add = ec_GFp_simple_add,
98 .dbl = ec_GFp_simple_dbl,
99 .invert = ec_GFp_simple_invert,
100 .is_at_infinity = ec_GFp_simple_is_at_infinity,
101 .is_on_curve = ec_GFp_simple_is_on_curve,
102 .point_cmp = ec_GFp_simple_cmp,
103 .make_affine = ec_GFp_simple_make_affine,
104 .points_make_affine = ec_GFp_simple_points_make_affine,
105 .field_mul = ec_GFp_mont_field_mul,
106 .field_sqr = ec_GFp_mont_field_sqr,
107 .field_encode = ec_GFp_mont_field_encode,
108 .field_decode = ec_GFp_mont_field_decode,
109 .field_set_to_one = ec_GFp_mont_field_set_to_one
110 };
111
112 return &ret;
113}
114
115
116int
117ec_GFp_mont_group_init(EC_GROUP * group)
118{
119 int ok;
120
121 ok = ec_GFp_simple_group_init(group);
122 group->field_data1 = NULL;
123 group->field_data2 = NULL;
124 return ok;
125}
126
127
128void
129ec_GFp_mont_group_finish(EC_GROUP * group)
130{
131 BN_MONT_CTX_free(group->field_data1);
132 group->field_data1 = NULL;
133 BN_free(group->field_data2);
134 group->field_data2 = NULL;
135 ec_GFp_simple_group_finish(group);
136}
137
138
139void
140ec_GFp_mont_group_clear_finish(EC_GROUP * group)
141{
142 BN_MONT_CTX_free(group->field_data1);
143 group->field_data1 = NULL;
144 BN_clear_free(group->field_data2);
145 group->field_data2 = NULL;
146 ec_GFp_simple_group_clear_finish(group);
147}
148
149
150int
151ec_GFp_mont_group_copy(EC_GROUP * dest, const EC_GROUP * src)
152{
153 BN_MONT_CTX_free(dest->field_data1);
154 dest->field_data1 = NULL;
155 BN_clear_free(dest->field_data2);
156 dest->field_data2 = NULL;
157
158 if (!ec_GFp_simple_group_copy(dest, src))
159 return 0;
160
161 if (src->field_data1 != NULL) {
162 dest->field_data1 = BN_MONT_CTX_new();
163 if (dest->field_data1 == NULL)
164 return 0;
165 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
166 goto err;
167 }
168 if (src->field_data2 != NULL) {
169 dest->field_data2 = BN_dup(src->field_data2);
170 if (dest->field_data2 == NULL)
171 goto err;
172 }
173 return 1;
174
175err:
176 if (dest->field_data1 != NULL) {
177 BN_MONT_CTX_free(dest->field_data1);
178 dest->field_data1 = NULL;
179 }
180 return 0;
181}
182
183
184int
185ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
186 const BIGNUM *b, BN_CTX *ctx)
187{
188 BN_CTX *new_ctx = NULL;
189 BN_MONT_CTX *mont = NULL;
190 BIGNUM *one = NULL;
191 int ret = 0;
192
193 BN_MONT_CTX_free(group->field_data1);
194 group->field_data1 = NULL;
195 BN_free(group->field_data2);
196 group->field_data2 = NULL;
197 if (ctx == NULL) {
198 ctx = new_ctx = BN_CTX_new();
199 if (ctx == NULL)
200 return 0;
201 }
202 mont = BN_MONT_CTX_new();
203 if (mont == NULL)
204 goto err;
205 if (!BN_MONT_CTX_set(mont, p, ctx)) {
206 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
207 goto err;
208 }
209 one = BN_new();
210 if (one == NULL)
211 goto err;
212 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
213 goto err;
214
215 group->field_data1 = mont;
216 mont = NULL;
217 group->field_data2 = one;
218 one = NULL;
219
220 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
221
222 if (!ret) {
223 BN_MONT_CTX_free(group->field_data1);
224 group->field_data1 = NULL;
225 BN_free(group->field_data2);
226 group->field_data2 = NULL;
227 }
228err:
229 BN_CTX_free(new_ctx);
230 BN_MONT_CTX_free(mont);
231 BN_free(one);
232 return ret;
233}
234
235
236int
237ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
238 const BIGNUM *b, BN_CTX *ctx)
239{
240 if (group->field_data1 == NULL) {
241 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
242 return 0;
243 }
244 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
245}
246
247
248int
249ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
250 BN_CTX *ctx)
251{
252 if (group->field_data1 == NULL) {
253 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
254 return 0;
255 }
256 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
257}
258
259
260int
261ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
262 BN_CTX *ctx)
263{
264 if (group->field_data1 == NULL) {
265 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
266 return 0;
267 }
268 return BN_to_montgomery(r, a, (BN_MONT_CTX *) group->field_data1, ctx);
269}
270
271
272int
273ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
274 BN_CTX *ctx)
275{
276 if (group->field_data1 == NULL) {
277 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
278 return 0;
279 }
280 return BN_from_montgomery(r, a, group->field_data1, ctx);
281}
282
283
284int
285ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
286{
287 if (group->field_data2 == NULL) {
288 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
289 return 0;
290 }
291 if (!BN_copy(r, group->field_data2))
292 return 0;
293 return 1;
294}
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