2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
12 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
13 * and contributed to the OpenSSL project.
16 #include <openssl/err.h>
20 const EC_METHOD *EC_GFp_mont_method(void)
22 static const EC_METHOD ret = {
24 NID_X9_62_prime_field,
25 ec_GFp_mont_group_init,
26 ec_GFp_mont_group_finish,
27 ec_GFp_mont_group_clear_finish,
28 ec_GFp_mont_group_copy,
29 ec_GFp_mont_group_set_curve,
30 ec_GFp_simple_group_get_curve,
31 ec_GFp_simple_group_get_degree,
32 ec_group_simple_order_bits,
33 ec_GFp_simple_group_check_discriminant,
34 ec_GFp_simple_point_init,
35 ec_GFp_simple_point_finish,
36 ec_GFp_simple_point_clear_finish,
37 ec_GFp_simple_point_copy,
38 ec_GFp_simple_point_set_to_infinity,
39 ec_GFp_simple_set_Jprojective_coordinates_GFp,
40 ec_GFp_simple_get_Jprojective_coordinates_GFp,
41 ec_GFp_simple_point_set_affine_coordinates,
42 ec_GFp_simple_point_get_affine_coordinates,
47 ec_GFp_simple_is_at_infinity,
48 ec_GFp_simple_is_on_curve,
50 ec_GFp_simple_make_affine,
51 ec_GFp_simple_points_make_affine,
53 0 /* precompute_mult */ ,
54 0 /* have_precompute_mult */ ,
55 ec_GFp_mont_field_mul,
56 ec_GFp_mont_field_sqr,
58 ec_GFp_mont_field_encode,
59 ec_GFp_mont_field_decode,
60 ec_GFp_mont_field_set_to_one,
61 ec_key_simple_priv2oct,
62 ec_key_simple_oct2priv,
64 ec_key_simple_generate_key,
65 ec_key_simple_check_key,
66 ec_key_simple_generate_public_key,
69 ecdh_simple_compute_key
75 int ec_GFp_mont_group_init(EC_GROUP *group)
79 ok = ec_GFp_simple_group_init(group);
80 group->field_data1 = NULL;
81 group->field_data2 = NULL;
85 void ec_GFp_mont_group_finish(EC_GROUP *group)
87 BN_MONT_CTX_free(group->field_data1);
88 group->field_data1 = NULL;
89 BN_free(group->field_data2);
90 group->field_data2 = NULL;
91 ec_GFp_simple_group_finish(group);
94 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
96 BN_MONT_CTX_free(group->field_data1);
97 group->field_data1 = NULL;
98 BN_clear_free(group->field_data2);
99 group->field_data2 = NULL;
100 ec_GFp_simple_group_clear_finish(group);
103 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
105 BN_MONT_CTX_free(dest->field_data1);
106 dest->field_data1 = NULL;
107 BN_clear_free(dest->field_data2);
108 dest->field_data2 = NULL;
110 if (!ec_GFp_simple_group_copy(dest, src))
113 if (src->field_data1 != NULL) {
114 dest->field_data1 = BN_MONT_CTX_new();
115 if (dest->field_data1 == NULL)
117 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
120 if (src->field_data2 != NULL) {
121 dest->field_data2 = BN_dup(src->field_data2);
122 if (dest->field_data2 == NULL)
129 BN_MONT_CTX_free(dest->field_data1);
130 dest->field_data1 = NULL;
134 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p,
135 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
137 BN_CTX *new_ctx = NULL;
138 BN_MONT_CTX *mont = NULL;
142 BN_MONT_CTX_free(group->field_data1);
143 group->field_data1 = NULL;
144 BN_free(group->field_data2);
145 group->field_data2 = NULL;
148 ctx = new_ctx = BN_CTX_new();
153 mont = BN_MONT_CTX_new();
156 if (!BN_MONT_CTX_set(mont, p, ctx)) {
157 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
163 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
166 group->field_data1 = mont;
168 group->field_data2 = one;
171 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
174 BN_MONT_CTX_free(group->field_data1);
175 group->field_data1 = NULL;
176 BN_free(group->field_data2);
177 group->field_data2 = NULL;
182 BN_CTX_free(new_ctx);
183 BN_MONT_CTX_free(mont);
187 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
188 const BIGNUM *b, BN_CTX *ctx)
190 if (group->field_data1 == NULL) {
191 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
195 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
198 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
201 if (group->field_data1 == NULL) {
202 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
206 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
209 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r,
210 const BIGNUM *a, BN_CTX *ctx)
212 if (group->field_data1 == NULL) {
213 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
217 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
220 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r,
221 const BIGNUM *a, BN_CTX *ctx)
223 if (group->field_data1 == NULL) {
224 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
228 return BN_from_montgomery(r, a, group->field_data1, ctx);
231 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
234 if (group->field_data2 == NULL) {
235 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
239 if (!BN_copy(r, group->field_data2))