1 /*
2 * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4 *
5 * Licensed under the Apache License 2.0 (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
9 */
10
11 /*
12 * ECDSA low level APIs are deprecated for public use, but still ok for
13 * internal use.
14 */
15 #include "internal/deprecated.h"
16
17 #include <limits.h>
18
19 #include <openssl/err.h>
20 #include <openssl/obj_mac.h>
21 #include "ec_local.h"
22
EC_GFp_nist_method(void)23 const EC_METHOD *EC_GFp_nist_method(void)
24 {
25 static const EC_METHOD ret = {
26 EC_FLAGS_DEFAULT_OCT,
27 NID_X9_62_prime_field,
28 ossl_ec_GFp_simple_group_init,
29 ossl_ec_GFp_simple_group_finish,
30 ossl_ec_GFp_simple_group_clear_finish,
31 ossl_ec_GFp_nist_group_copy,
32 ossl_ec_GFp_nist_group_set_curve,
33 ossl_ec_GFp_simple_group_get_curve,
34 ossl_ec_GFp_simple_group_get_degree,
35 ossl_ec_group_simple_order_bits,
36 ossl_ec_GFp_simple_group_check_discriminant,
37 ossl_ec_GFp_simple_point_init,
38 ossl_ec_GFp_simple_point_finish,
39 ossl_ec_GFp_simple_point_clear_finish,
40 ossl_ec_GFp_simple_point_copy,
41 ossl_ec_GFp_simple_point_set_to_infinity,
42 ossl_ec_GFp_simple_point_set_affine_coordinates,
43 ossl_ec_GFp_simple_point_get_affine_coordinates,
44 0, 0, 0,
45 ossl_ec_GFp_simple_add,
46 ossl_ec_GFp_simple_dbl,
47 ossl_ec_GFp_simple_invert,
48 ossl_ec_GFp_simple_is_at_infinity,
49 ossl_ec_GFp_simple_is_on_curve,
50 ossl_ec_GFp_simple_cmp,
51 ossl_ec_GFp_simple_make_affine,
52 ossl_ec_GFp_simple_points_make_affine,
53 0 /* mul */ ,
54 0 /* precompute_mult */ ,
55 0 /* have_precompute_mult */ ,
56 ossl_ec_GFp_nist_field_mul,
57 ossl_ec_GFp_nist_field_sqr,
58 0 /* field_div */ ,
59 ossl_ec_GFp_simple_field_inv,
60 0 /* field_encode */ ,
61 0 /* field_decode */ ,
62 0, /* field_set_to_one */
63 ossl_ec_key_simple_priv2oct,
64 ossl_ec_key_simple_oct2priv,
65 0, /* set private */
66 ossl_ec_key_simple_generate_key,
67 ossl_ec_key_simple_check_key,
68 ossl_ec_key_simple_generate_public_key,
69 0, /* keycopy */
70 0, /* keyfinish */
71 ossl_ecdh_simple_compute_key,
72 ossl_ecdsa_simple_sign_setup,
73 ossl_ecdsa_simple_sign_sig,
74 ossl_ecdsa_simple_verify_sig,
75 0, /* field_inverse_mod_ord */
76 ossl_ec_GFp_simple_blind_coordinates,
77 ossl_ec_GFp_simple_ladder_pre,
78 ossl_ec_GFp_simple_ladder_step,
79 ossl_ec_GFp_simple_ladder_post
80 };
81
82 return &ret;
83 }
84
ossl_ec_GFp_nist_group_copy(EC_GROUP * dest,const EC_GROUP * src)85 int ossl_ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
86 {
87 dest->field_mod_func = src->field_mod_func;
88
89 return ossl_ec_GFp_simple_group_copy(dest, src);
90 }
91
ossl_ec_GFp_nist_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)92 int ossl_ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
93 const BIGNUM *a, const BIGNUM *b,
94 BN_CTX *ctx)
95 {
96 int ret = 0;
97 BN_CTX *new_ctx = NULL;
98
99 if (ctx == NULL)
100 if ((ctx = new_ctx = BN_CTX_new_ex(group->libctx)) == NULL)
101 return 0;
102
103 BN_CTX_start(ctx);
104
105 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
106 group->field_mod_func = BN_nist_mod_192;
107 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
108 group->field_mod_func = BN_nist_mod_224;
109 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
110 group->field_mod_func = BN_nist_mod_256;
111 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
112 group->field_mod_func = BN_nist_mod_384;
113 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
114 group->field_mod_func = BN_nist_mod_521;
115 else {
116 ERR_raise(ERR_LIB_EC, EC_R_NOT_A_NIST_PRIME);
117 goto err;
118 }
119
120 ret = ossl_ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
121
122 err:
123 BN_CTX_end(ctx);
124 BN_CTX_free(new_ctx);
125 return ret;
126 }
127
ossl_ec_GFp_nist_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)128 int ossl_ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
129 const BIGNUM *b, BN_CTX *ctx)
130 {
131 int ret = 0;
132 BN_CTX *ctx_new = NULL;
133
134 if (!group || !r || !a || !b) {
135 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
136 goto err;
137 }
138 if (!ctx)
139 if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL)
140 goto err;
141
142 if (!BN_mul(r, a, b, ctx))
143 goto err;
144 if (!group->field_mod_func(r, r, group->field, ctx))
145 goto err;
146
147 ret = 1;
148 err:
149 BN_CTX_free(ctx_new);
150 return ret;
151 }
152
ossl_ec_GFp_nist_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)153 int ossl_ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
154 BN_CTX *ctx)
155 {
156 int ret = 0;
157 BN_CTX *ctx_new = NULL;
158
159 if (!group || !r || !a) {
160 ERR_raise(ERR_LIB_EC, EC_R_PASSED_NULL_PARAMETER);
161 goto err;
162 }
163 if (!ctx)
164 if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL)
165 goto err;
166
167 if (!BN_sqr(r, a, ctx))
168 goto err;
169 if (!group->field_mod_func(r, r, group->field, ctx))
170 goto err;
171
172 ret = 1;
173 err:
174 BN_CTX_free(ctx_new);
175 return ret;
176 }
177
