2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
5 * Licensed under the OpenSSL license (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
11 #include <openssl/err.h>
15 const EC_METHOD *EC_GFp_mont_method(void)
17 static const EC_METHOD ret = {
19 NID_X9_62_prime_field,
20 ec_GFp_mont_group_init,
21 ec_GFp_mont_group_finish,
22 ec_GFp_mont_group_clear_finish,
23 ec_GFp_mont_group_copy,
24 ec_GFp_mont_group_set_curve,
25 ec_GFp_simple_group_get_curve,
26 ec_GFp_simple_group_get_degree,
27 ec_group_simple_order_bits,
28 ec_GFp_simple_group_check_discriminant,
29 ec_GFp_simple_point_init,
30 ec_GFp_simple_point_finish,
31 ec_GFp_simple_point_clear_finish,
32 ec_GFp_simple_point_copy,
33 ec_GFp_simple_point_set_to_infinity,
34 ec_GFp_simple_set_Jprojective_coordinates_GFp,
35 ec_GFp_simple_get_Jprojective_coordinates_GFp,
36 ec_GFp_simple_point_set_affine_coordinates,
37 ec_GFp_simple_point_get_affine_coordinates,
42 ec_GFp_simple_is_at_infinity,
43 ec_GFp_simple_is_on_curve,
45 ec_GFp_simple_make_affine,
46 ec_GFp_simple_points_make_affine,
48 0 /* precompute_mult */ ,
49 0 /* have_precompute_mult */ ,
50 ec_GFp_mont_field_mul,
51 ec_GFp_mont_field_sqr,
53 ec_GFp_mont_field_encode,
54 ec_GFp_mont_field_decode,
55 ec_GFp_mont_field_set_to_one,
56 ec_key_simple_priv2oct,
57 ec_key_simple_oct2priv,
59 ec_key_simple_generate_key,
60 ec_key_simple_check_key,
61 ec_key_simple_generate_public_key,
64 ecdh_simple_compute_key
70 int ec_GFp_mont_group_init(EC_GROUP *group)
74 ok = ec_GFp_simple_group_init(group);
75 group->field_data1 = NULL;
76 group->field_data2 = NULL;
80 void ec_GFp_mont_group_finish(EC_GROUP *group)
82 BN_MONT_CTX_free(group->field_data1);
83 group->field_data1 = NULL;
84 BN_free(group->field_data2);
85 group->field_data2 = NULL;
86 ec_GFp_simple_group_finish(group);
89 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
91 BN_MONT_CTX_free(group->field_data1);
92 group->field_data1 = NULL;
93 BN_clear_free(group->field_data2);
94 group->field_data2 = NULL;
95 ec_GFp_simple_group_clear_finish(group);
98 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
100 BN_MONT_CTX_free(dest->field_data1);
101 dest->field_data1 = NULL;
102 BN_clear_free(dest->field_data2);
103 dest->field_data2 = NULL;
105 if (!ec_GFp_simple_group_copy(dest, src))
108 if (src->field_data1 != NULL) {
109 dest->field_data1 = BN_MONT_CTX_new();
110 if (dest->field_data1 == NULL)
112 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
115 if (src->field_data2 != NULL) {
116 dest->field_data2 = BN_dup(src->field_data2);
117 if (dest->field_data2 == NULL)
124 BN_MONT_CTX_free(dest->field_data1);
125 dest->field_data1 = NULL;
129 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p,
130 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
132 BN_CTX *new_ctx = NULL;
133 BN_MONT_CTX *mont = NULL;
137 BN_MONT_CTX_free(group->field_data1);
138 group->field_data1 = NULL;
139 BN_free(group->field_data2);
140 group->field_data2 = NULL;
143 ctx = new_ctx = BN_CTX_new();
148 mont = BN_MONT_CTX_new();
151 if (!BN_MONT_CTX_set(mont, p, ctx)) {
152 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
158 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
161 group->field_data1 = mont;
163 group->field_data2 = one;
166 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
169 BN_MONT_CTX_free(group->field_data1);
170 group->field_data1 = NULL;
171 BN_free(group->field_data2);
172 group->field_data2 = NULL;
177 BN_CTX_free(new_ctx);
178 BN_MONT_CTX_free(mont);
182 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
183 const BIGNUM *b, BN_CTX *ctx)
185 if (group->field_data1 == NULL) {
186 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
190 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
193 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
196 if (group->field_data1 == NULL) {
197 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
201 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
204 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r,
205 const BIGNUM *a, BN_CTX *ctx)
207 if (group->field_data1 == NULL) {
208 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
212 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
215 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r,
216 const BIGNUM *a, BN_CTX *ctx)
218 if (group->field_data1 == NULL) {
219 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
223 return BN_from_montgomery(r, a, group->field_data1, ctx);
226 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
229 if (group->field_data2 == NULL) {
230 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
234 if (!BN_copy(r, group->field_data2))