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ecp_nist.c

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1/* $OpenBSD: ecp_nist.c,v 1.14 2018/07/16 17:32:39 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-
70const EC_METHOD *-
71EC_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 };-
112-
113 return &ret;
never executed: return &ret;
0
114}-
115-
116int -
117ec_GFp_nist_group_copy(EC_GROUP * dest, const EC_GROUP * src)-
118{-
119 dest->field_mod_func = src->field_mod_func;-
120-
121 return ec_GFp_simple_group_copy(dest, src);
never executed: return ec_GFp_simple_group_copy(dest, src);
0
122}-
123-
124int -
125ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,-
126 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)-
127{-
128 int ret = 0;-
129 BN_CTX *new_ctx = NULL;-
130 BIGNUM *tmp_bn;-
131-
132 if (ctx == NULL)
ctx == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
133 if ((ctx = new_ctx = BN_CTX_new()) == NULL)
(ctx = new_ctx...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
134 return 0;
never executed: return 0;
0
135-
136 BN_CTX_start(ctx);-
137 if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
(tmp_bn = BN_C...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
138 goto err;
never executed: goto err;
0
139-
140 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
BN_ucmp(BN_get...192(), p) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
141 group->field_mod_func = BN_nist_mod_192;
never executed: group->field_mod_func = BN_nist_mod_192;
0
142 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
BN_ucmp(BN_get...224(), p) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
143 group->field_mod_func = BN_nist_mod_224;
never executed: group->field_mod_func = BN_nist_mod_224;
0
144 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
BN_ucmp(BN_get...256(), p) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
145 group->field_mod_func = BN_nist_mod_256;
never executed: group->field_mod_func = BN_nist_mod_256;
0
146 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
BN_ucmp(BN_get...384(), p) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
147 group->field_mod_func = BN_nist_mod_384;
never executed: group->field_mod_func = BN_nist_mod_384;
0
148 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
BN_ucmp(BN_get...521(), p) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
149 group->field_mod_func = BN_nist_mod_521;
never executed: group->field_mod_func = BN_nist_mod_521;
0
150 else {-
151 ECerror(EC_R_NOT_A_NIST_PRIME);-
152 goto err;
never executed: goto err;
0
153 }-
154-
155 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);-
156-
157 err:
code before this statement never executed: err:
0
158 BN_CTX_end(ctx);-
159 BN_CTX_free(new_ctx);-
160 return ret;
never executed: return ret;
0
161}-
162-
163-
164int -
165ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,-
166 const BIGNUM *b, BN_CTX *ctx)-
167{-
168 int ret = 0;-
169 BN_CTX *ctx_new = NULL;-
170-
171 if (!group || !r || !a || !b) {
!groupDescription
TRUEnever evaluated
FALSEnever evaluated
!rDescription
TRUEnever evaluated
FALSEnever evaluated
!aDescription
TRUEnever evaluated
FALSEnever evaluated
!bDescription
TRUEnever evaluated
FALSEnever evaluated
0
172 ECerror(ERR_R_PASSED_NULL_PARAMETER);-
173 goto err;
never executed: goto err;
0
174 }-
175 if (!ctx)
!ctxDescription
TRUEnever evaluated
FALSEnever evaluated
0
176 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
(ctx_new = ctx...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
177 goto err;
never executed: goto err;
0
178-
179 if (!BN_mul(r, a, b, ctx))
!BN_mul(r, a, b, ctx)Description
TRUEnever evaluated
FALSEnever evaluated
0
180 goto err;
never executed: goto err;
0
181 if (!group->field_mod_func(r, r, &group->field, ctx))
!group->field_...p->field, ctx)Description
TRUEnever evaluated
FALSEnever evaluated
0
182 goto err;
never executed: goto err;
0
183-
184 ret = 1;-
185 err:
code before this statement never executed: err:
0
186 BN_CTX_free(ctx_new);-
187 return ret;
never executed: return ret;
0
188}-
189-
190-
191int -
192ec_GFp_nist_field_sqr(const EC_GROUP * group, BIGNUM * r, const BIGNUM * a,-
193 BN_CTX * ctx)-
194{-
195 int ret = 0;-
196 BN_CTX *ctx_new = NULL;-
197-
198 if (!group || !r || !a) {
!groupDescription
TRUEnever evaluated
FALSEnever evaluated
!rDescription
TRUEnever evaluated
FALSEnever evaluated
!aDescription
TRUEnever evaluated
FALSEnever evaluated
0
199 ECerror(EC_R_PASSED_NULL_PARAMETER);-
200 goto err;
never executed: goto err;
0
201 }-
202 if (!ctx)
!ctxDescription
TRUEnever evaluated
FALSEnever evaluated
0
203 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
(ctx_new = ctx...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
204 goto err;
never executed: goto err;
0
205-
206 if (!BN_sqr(r, a, ctx))
!BN_sqr(r, a, ctx)Description
TRUEnever evaluated
FALSEnever evaluated
0
207 goto err;
never executed: goto err;
0
208 if (!group->field_mod_func(r, r, &group->field, ctx))
!group->field_...p->field, ctx)Description
TRUEnever evaluated
FALSEnever evaluated
0
209 goto err;
never executed: goto err;
0
210-
211 ret = 1;-
212 err:
code before this statement never executed: err:
0
213 BN_CTX_free(ctx_new);-
214 return ret;
never executed: return ret;
0
215}-
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