1 /* $OpenBSD: ecp_nist.c,v 1.15 2018/11/05 20:18:21 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/obj_mac.h>
68 #include "ec_lcl.h"
69
70 const EC_METHOD *
EC_GFp_nist_method(void)71 EC_GFp_nist_method(void)
72 {
73 static const EC_METHOD ret = {
74 .flags = EC_FLAGS_DEFAULT_OCT,
75 .field_type = NID_X9_62_prime_field,
76 .group_init = ec_GFp_simple_group_init,
77 .group_finish = ec_GFp_simple_group_finish,
78 .group_clear_finish = ec_GFp_simple_group_clear_finish,
79 .group_copy = ec_GFp_nist_group_copy,
80 .group_set_curve = ec_GFp_nist_group_set_curve,
81 .group_get_curve = ec_GFp_simple_group_get_curve,
82 .group_get_degree = ec_GFp_simple_group_get_degree,
83 .group_check_discriminant =
84 ec_GFp_simple_group_check_discriminant,
85 .point_init = ec_GFp_simple_point_init,
86 .point_finish = ec_GFp_simple_point_finish,
87 .point_clear_finish = ec_GFp_simple_point_clear_finish,
88 .point_copy = ec_GFp_simple_point_copy,
89 .point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
90 .point_set_Jprojective_coordinates_GFp =
91 ec_GFp_simple_set_Jprojective_coordinates_GFp,
92 .point_get_Jprojective_coordinates_GFp =
93 ec_GFp_simple_get_Jprojective_coordinates_GFp,
94 .point_set_affine_coordinates =
95 ec_GFp_simple_point_set_affine_coordinates,
96 .point_get_affine_coordinates =
97 ec_GFp_simple_point_get_affine_coordinates,
98 .add = ec_GFp_simple_add,
99 .dbl = ec_GFp_simple_dbl,
100 .invert = ec_GFp_simple_invert,
101 .is_at_infinity = ec_GFp_simple_is_at_infinity,
102 .is_on_curve = ec_GFp_simple_is_on_curve,
103 .point_cmp = ec_GFp_simple_cmp,
104 .make_affine = ec_GFp_simple_make_affine,
105 .points_make_affine = ec_GFp_simple_points_make_affine,
106 .mul_generator_ct = ec_GFp_simple_mul_generator_ct,
107 .mul_single_ct = ec_GFp_simple_mul_single_ct,
108 .mul_double_nonct = ec_GFp_simple_mul_double_nonct,
109 .field_mul = ec_GFp_nist_field_mul,
110 .field_sqr = ec_GFp_nist_field_sqr,
111 .blind_coordinates = ec_GFp_simple_blind_coordinates,
112 };
113
114 return &ret;
115 }
116
117 int
ec_GFp_nist_group_copy(EC_GROUP * dest,const EC_GROUP * src)118 ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src)
119 {
120 dest->field_mod_func = src->field_mod_func;
121
122 return ec_GFp_simple_group_copy(dest, src);
123 }
124
125 int
ec_GFp_nist_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)126 ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
127 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
128 {
129 int ret = 0;
130 BN_CTX *new_ctx = NULL;
131 BIGNUM *tmp_bn;
132
133 if (ctx == NULL)
134 if ((ctx = new_ctx = BN_CTX_new()) == NULL)
135 return 0;
136
137 BN_CTX_start(ctx);
138 if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
139 goto err;
140
141 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
142 group->field_mod_func = BN_nist_mod_192;
143 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
144 group->field_mod_func = BN_nist_mod_224;
145 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
146 group->field_mod_func = BN_nist_mod_256;
147 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
148 group->field_mod_func = BN_nist_mod_384;
149 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
150 group->field_mod_func = BN_nist_mod_521;
151 else {
152 ECerror(EC_R_NOT_A_NIST_PRIME);
153 goto err;
154 }
155
156 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
157
158 err:
159 BN_CTX_end(ctx);
160 BN_CTX_free(new_ctx);
161 return ret;
162 }
163
164
165 int
ec_GFp_nist_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)166 ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
167 const BIGNUM *b, BN_CTX *ctx)
168 {
169 int ret = 0;
170 BN_CTX *ctx_new = NULL;
171
172 if (!group || !r || !a || !b) {
173 ECerror(ERR_R_PASSED_NULL_PARAMETER);
174 goto err;
175 }
176 if (!ctx)
177 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
178 goto err;
179
180 if (!BN_mul(r, a, b, ctx))
181 goto err;
182 if (!group->field_mod_func(r, r, &group->field, ctx))
183 goto err;
184
185 ret = 1;
186 err:
187 BN_CTX_free(ctx_new);
188 return ret;
189 }
190
191
192 int
ec_GFp_nist_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)193 ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a,
194 BN_CTX * ctx)
195 {
196 int ret = 0;
197 BN_CTX *ctx_new = NULL;
198
199 if (!group || !r || !a) {
200 ECerror(EC_R_PASSED_NULL_PARAMETER);
201 goto err;
202 }
203 if (!ctx)
204 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
205 goto err;
206
207 if (!BN_sqr(r, a, ctx))
208 goto err;
209 if (!group->field_mod_func(r, r, &group->field, ctx))
210 goto err;
211
212 ret = 1;
213 err:
214 BN_CTX_free(ctx_new);
215 return ret;
216 }
217