2 * Copyright 2001-2019 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.
18 #include <openssl/err.h>
19 #include <openssl/obj_mac.h>
22 const EC_METHOD *EC_GFp_nist_method(void)
24 static const EC_METHOD ret = {
26 NID_X9_62_prime_field,
27 ec_GFp_simple_group_init,
28 ec_GFp_simple_group_finish,
29 ec_GFp_simple_group_clear_finish,
30 ec_GFp_nist_group_copy,
31 ec_GFp_nist_group_set_curve,
32 ec_GFp_simple_group_get_curve,
33 ec_GFp_simple_group_get_degree,
34 ec_group_simple_order_bits,
35 ec_GFp_simple_group_check_discriminant,
36 ec_GFp_simple_point_init,
37 ec_GFp_simple_point_finish,
38 ec_GFp_simple_point_clear_finish,
39 ec_GFp_simple_point_copy,
40 ec_GFp_simple_point_set_to_infinity,
41 ec_GFp_simple_set_Jprojective_coordinates_GFp,
42 ec_GFp_simple_get_Jprojective_coordinates_GFp,
43 ec_GFp_simple_point_set_affine_coordinates,
44 ec_GFp_simple_point_get_affine_coordinates,
49 ec_GFp_simple_is_at_infinity,
50 ec_GFp_simple_is_on_curve,
52 ec_GFp_simple_make_affine,
53 ec_GFp_simple_points_make_affine,
55 0 /* precompute_mult */ ,
56 0 /* have_precompute_mult */ ,
57 ec_GFp_nist_field_mul,
58 ec_GFp_nist_field_sqr,
60 ec_GFp_simple_field_inv,
61 0 /* field_encode */ ,
62 0 /* field_decode */ ,
63 0, /* field_set_to_one */
64 ec_key_simple_priv2oct,
65 ec_key_simple_oct2priv,
67 ec_key_simple_generate_key,
68 ec_key_simple_check_key,
69 ec_key_simple_generate_public_key,
72 ecdh_simple_compute_key,
73 ec_GFp_simple_blind_coordinates
79 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
81 dest->field_mod_func = src->field_mod_func;
83 return ec_GFp_simple_group_copy(dest, src);
86 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
87 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
90 BN_CTX *new_ctx = NULL;
93 if ((ctx = new_ctx = BN_CTX_new()) == NULL)
98 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
99 group->field_mod_func = BN_nist_mod_192;
100 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
101 group->field_mod_func = BN_nist_mod_224;
102 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
103 group->field_mod_func = BN_nist_mod_256;
104 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
105 group->field_mod_func = BN_nist_mod_384;
106 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
107 group->field_mod_func = BN_nist_mod_521;
109 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
113 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
117 BN_CTX_free(new_ctx);
121 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
122 const BIGNUM *b, BN_CTX *ctx)
125 BN_CTX *ctx_new = NULL;
127 if (!group || !r || !a || !b) {
128 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
132 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
135 if (!BN_mul(r, a, b, ctx))
137 if (!group->field_mod_func(r, r, group->field, ctx))
142 BN_CTX_free(ctx_new);
146 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
150 BN_CTX *ctx_new = NULL;
152 if (!group || !r || !a) {
153 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
157 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
160 if (!BN_sqr(r, a, ctx))
162 if (!group->field_mod_func(r, r, group->field, ctx))
167 BN_CTX_free(ctx_new);