1 /* $OpenBSD: ecp_mont.c,v 1.17 2018/11/05 20:18:21 tb Exp $ */
3 * Originally written by Bodo Moeller for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
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.
64 #include <openssl/err.h>
70 EC_GFp_mont_method(void)
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 .mul_generator_ct = ec_GFp_simple_mul_generator_ct,
106 .mul_single_ct = ec_GFp_simple_mul_single_ct,
107 .mul_double_nonct = ec_GFp_simple_mul_double_nonct,
108 .field_mul = ec_GFp_mont_field_mul,
109 .field_sqr = ec_GFp_mont_field_sqr,
110 .field_encode = ec_GFp_mont_field_encode,
111 .field_decode = ec_GFp_mont_field_decode,
112 .field_set_to_one = ec_GFp_mont_field_set_to_one,
113 .blind_coordinates = ec_GFp_simple_blind_coordinates,
121 ec_GFp_mont_group_init(EC_GROUP * group)
125 ok = ec_GFp_simple_group_init(group);
126 group->field_data1 = NULL;
127 group->field_data2 = NULL;
133 ec_GFp_mont_group_finish(EC_GROUP * group)
135 BN_MONT_CTX_free(group->field_data1);
136 group->field_data1 = NULL;
137 BN_free(group->field_data2);
138 group->field_data2 = NULL;
139 ec_GFp_simple_group_finish(group);
144 ec_GFp_mont_group_clear_finish(EC_GROUP * group)
146 BN_MONT_CTX_free(group->field_data1);
147 group->field_data1 = NULL;
148 BN_clear_free(group->field_data2);
149 group->field_data2 = NULL;
150 ec_GFp_simple_group_clear_finish(group);
155 ec_GFp_mont_group_copy(EC_GROUP * dest, const EC_GROUP * src)
157 BN_MONT_CTX_free(dest->field_data1);
158 dest->field_data1 = NULL;
159 BN_clear_free(dest->field_data2);
160 dest->field_data2 = NULL;
162 if (!ec_GFp_simple_group_copy(dest, src))
165 if (src->field_data1 != NULL) {
166 dest->field_data1 = BN_MONT_CTX_new();
167 if (dest->field_data1 == NULL)
169 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
172 if (src->field_data2 != NULL) {
173 dest->field_data2 = BN_dup(src->field_data2);
174 if (dest->field_data2 == NULL)
180 if (dest->field_data1 != NULL) {
181 BN_MONT_CTX_free(dest->field_data1);
182 dest->field_data1 = NULL;
189 ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
190 const BIGNUM *b, BN_CTX *ctx)
192 BN_CTX *new_ctx = NULL;
193 BN_MONT_CTX *mont = NULL;
197 BN_MONT_CTX_free(group->field_data1);
198 group->field_data1 = NULL;
199 BN_free(group->field_data2);
200 group->field_data2 = NULL;
202 ctx = new_ctx = BN_CTX_new();
206 mont = BN_MONT_CTX_new();
209 if (!BN_MONT_CTX_set(mont, p, ctx)) {
210 ECerror(ERR_R_BN_LIB);
216 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
219 group->field_data1 = mont;
221 group->field_data2 = one;
224 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
227 BN_MONT_CTX_free(group->field_data1);
228 group->field_data1 = NULL;
229 BN_free(group->field_data2);
230 group->field_data2 = NULL;
233 BN_CTX_free(new_ctx);
234 BN_MONT_CTX_free(mont);
241 ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
242 const BIGNUM *b, BN_CTX *ctx)
244 if (group->field_data1 == NULL) {
245 ECerror(EC_R_NOT_INITIALIZED);
248 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
253 ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
256 if (group->field_data1 == NULL) {
257 ECerror(EC_R_NOT_INITIALIZED);
260 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
265 ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
268 if (group->field_data1 == NULL) {
269 ECerror(EC_R_NOT_INITIALIZED);
272 return BN_to_montgomery(r, a, (BN_MONT_CTX *) group->field_data1, ctx);
277 ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
280 if (group->field_data1 == NULL) {
281 ECerror(EC_R_NOT_INITIALIZED);
284 return BN_from_montgomery(r, a, group->field_data1, ctx);
289 ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
291 if (group->field_data2 == NULL) {
292 ECerror(EC_R_NOT_INITIALIZED);
295 if (!BN_copy(r, group->field_data2))