1 /* $OpenBSD: ecp_nist.c,v 1.19 2022/06/30 11:14:47 tb Exp $ */
2 /*
3 * Written by Nils Larsch for the OpenSSL project.
4 */
5 /* ====================================================================
6 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 *
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 * ====================================================================
52 *
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).
56 *
57 */
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.
62 */
63
64 #include <limits.h>
65
66 #include <openssl/err.h>
67 #include <openssl/objects.h>
68
69 #include "ec_lcl.h"
70
71 const EC_METHOD *
EC_GFp_nist_method(void)72 EC_GFp_nist_method(void)
73 {
74 static const EC_METHOD ret = {
75 .flags = EC_FLAGS_DEFAULT_OCT,
76 .field_type = NID_X9_62_prime_field,
77 .group_init = ec_GFp_simple_group_init,
78 .group_finish = ec_GFp_simple_group_finish,
79 .group_clear_finish = ec_GFp_simple_group_clear_finish,
80 .group_copy = ec_GFp_nist_group_copy,
81 .group_set_curve = ec_GFp_nist_group_set_curve,
82 .group_get_curve = ec_GFp_simple_group_get_curve,
83 .group_get_degree = ec_GFp_simple_group_get_degree,
84 .group_order_bits = ec_group_simple_order_bits,
85 .group_check_discriminant =
86 ec_GFp_simple_group_check_discriminant,
87 .point_init = ec_GFp_simple_point_init,
88 .point_finish = ec_GFp_simple_point_finish,
89 .point_clear_finish = ec_GFp_simple_point_clear_finish,
90 .point_copy = ec_GFp_simple_point_copy,
91 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
92 .point_set_Jprojective_coordinates =
93 ec_GFp_simple_set_Jprojective_coordinates,
94 .point_get_Jprojective_coordinates =
95 ec_GFp_simple_get_Jprojective_coordinates,
96 .point_set_affine_coordinates =
97 ec_GFp_simple_point_set_affine_coordinates,
98 .point_get_affine_coordinates =
99 ec_GFp_simple_point_get_affine_coordinates,
100 .add = ec_GFp_simple_add,
101 .dbl = ec_GFp_simple_dbl,
102 .invert = ec_GFp_simple_invert,
103 .is_at_infinity = ec_GFp_simple_is_at_infinity,
104 .is_on_curve = ec_GFp_simple_is_on_curve,
105 .point_cmp = ec_GFp_simple_cmp,
106 .make_affine = ec_GFp_simple_make_affine,
107 .points_make_affine = ec_GFp_simple_points_make_affine,
108 .mul_generator_ct = ec_GFp_simple_mul_generator_ct,
109 .mul_single_ct = ec_GFp_simple_mul_single_ct,
110 .mul_double_nonct = ec_GFp_simple_mul_double_nonct,
111 .field_mul = ec_GFp_nist_field_mul,
112 .field_sqr = ec_GFp_nist_field_sqr,
113 .blind_coordinates = ec_GFp_simple_blind_coordinates,
114 };
115
116 return &ret;
117 }
118
119 int
ec_GFp_nist_group_copy(EC_GROUP * dest,const EC_GROUP * src)120 ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src)
121 {
122 dest->field_mod_func = src->field_mod_func;
123
124 return ec_GFp_simple_group_copy(dest, src);
125 }
126
127 int
ec_GFp_nist_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)128 ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
129 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
130 {
131 int ret = 0;
132 BN_CTX *new_ctx = NULL;
133 BIGNUM *tmp_bn;
134
135 if (ctx == NULL)
136 if ((ctx = new_ctx = BN_CTX_new()) == NULL)
137 return 0;
138
139 BN_CTX_start(ctx);
140 if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
141 goto err;
142
143 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
144 group->field_mod_func = BN_nist_mod_192;
145 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
146 group->field_mod_func = BN_nist_mod_224;
147 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
148 group->field_mod_func = BN_nist_mod_256;
149 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
150 group->field_mod_func = BN_nist_mod_384;
151 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
152 group->field_mod_func = BN_nist_mod_521;
153 else {
154 ECerror(EC_R_NOT_A_NIST_PRIME);
155 goto err;
156 }
157
158 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
159
160 err:
161 BN_CTX_end(ctx);
162 BN_CTX_free(new_ctx);
163 return ret;
164 }
165
166
167 int
ec_GFp_nist_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)168 ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
169 const BIGNUM *b, BN_CTX *ctx)
170 {
171 int ret = 0;
172 BN_CTX *ctx_new = NULL;
173
174 if (!group || !r || !a || !b) {
175 ECerror(ERR_R_PASSED_NULL_PARAMETER);
176 goto err;
177 }
178 if (!ctx)
179 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
180 goto err;
181
182 if (!BN_mul(r, a, b, ctx))
183 goto err;
184 if (!group->field_mod_func(r, r, &group->field, ctx))
185 goto err;
186
187 ret = 1;
188 err:
189 BN_CTX_free(ctx_new);
190 return ret;
191 }
192
193
194 int
ec_GFp_nist_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)195 ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a,
196 BN_CTX * ctx)
197 {
198 int ret = 0;
199 BN_CTX *ctx_new = NULL;
200
201 if (!group || !r || !a) {
202 ECerror(EC_R_PASSED_NULL_PARAMETER);
203 goto err;
204 }
205 if (!ctx)
206 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
207 goto err;
208
209 if (!BN_sqr(r, a, ctx))
210 goto err;
211 if (!group->field_mod_func(r, r, &group->field, ctx))
212 goto err;
213
214 ret = 1;
215 err:
216 BN_CTX_free(ctx_new);
217 return ret;
218 }
219