1 /* crypto/ec/ecp_nist.c */
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
EC_GFp_nist_method(void)70 const EC_METHOD *EC_GFp_nist_method(void)
71 {
72 static const EC_METHOD ret = {
73 NID_X9_62_prime_field,
74 ec_GFp_simple_group_init,
75 ec_GFp_simple_group_finish,
76 ec_GFp_simple_group_clear_finish,
77 ec_GFp_nist_group_copy,
78 ec_GFp_nist_group_set_curve,
79 ec_GFp_simple_group_get_curve,
80 ec_GFp_simple_group_get_degree,
81 ec_GFp_simple_group_check_discriminant,
82 ec_GFp_simple_point_init,
83 ec_GFp_simple_point_finish,
84 ec_GFp_simple_point_clear_finish,
85 ec_GFp_simple_point_copy,
86 ec_GFp_simple_point_set_to_infinity,
87 ec_GFp_simple_set_Jprojective_coordinates_GFp,
88 ec_GFp_simple_get_Jprojective_coordinates_GFp,
89 ec_GFp_simple_point_set_affine_coordinates,
90 ec_GFp_simple_point_get_affine_coordinates,
91 ec_GFp_simple_set_compressed_coordinates,
92 ec_GFp_simple_point2oct,
93 ec_GFp_simple_oct2point,
94 ec_GFp_simple_add,
95 ec_GFp_simple_dbl,
96 ec_GFp_simple_invert,
97 ec_GFp_simple_is_at_infinity,
98 ec_GFp_simple_is_on_curve,
99 ec_GFp_simple_cmp,
100 ec_GFp_simple_make_affine,
101 ec_GFp_simple_points_make_affine,
102 0 /* mul */,
103 0 /* precompute_mult */,
104 0 /* have_precompute_mult */,
105 ec_GFp_nist_field_mul,
106 ec_GFp_nist_field_sqr,
107 0 /* field_div */,
108 0 /* field_encode */,
109 0 /* field_decode */,
110 0 /* field_set_to_one */ };
111
112 return &ret;
113 }
114
ec_GFp_nist_group_copy(EC_GROUP * dest,const EC_GROUP * src)115 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
116 {
117 dest->field_mod_func = src->field_mod_func;
118
119 return ec_GFp_simple_group_copy(dest, src);
120 }
121
ec_GFp_nist_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)122 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
123 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
124 {
125 int ret = 0;
126 BN_CTX *new_ctx = NULL;
127 BIGNUM *tmp_bn;
128
129 if (ctx == NULL)
130 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
131
132 BN_CTX_start(ctx);
133 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err;
134
135 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
136 group->field_mod_func = BN_nist_mod_192;
137 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
138 group->field_mod_func = BN_nist_mod_224;
139 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
140 group->field_mod_func = BN_nist_mod_256;
141 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
142 group->field_mod_func = BN_nist_mod_384;
143 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
144 group->field_mod_func = BN_nist_mod_521;
145 else
146 {
147 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
148 goto err;
149 }
150
151 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
152
153 err:
154 BN_CTX_end(ctx);
155 if (new_ctx != NULL)
156 BN_CTX_free(new_ctx);
157 return ret;
158 }
159
160
ec_GFp_nist_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)161 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
162 const BIGNUM *b, BN_CTX *ctx)
163 {
164 int ret=0;
165 BN_CTX *ctx_new=NULL;
166
167 if (!group || !r || !a || !b)
168 {
169 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
170 goto err;
171 }
172 if (!ctx)
173 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
174
175 if (!BN_mul(r, a, b, ctx)) goto err;
176 if (!group->field_mod_func(r, r, &group->field, ctx))
177 goto err;
178
179 ret=1;
180 err:
181 if (ctx_new)
182 BN_CTX_free(ctx_new);
183 return ret;
184 }
185
186
ec_GFp_nist_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)187 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
188 BN_CTX *ctx)
189 {
190 int ret=0;
191 BN_CTX *ctx_new=NULL;
192
193 if (!group || !r || !a)
194 {
195 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
196 goto err;
197 }
198 if (!ctx)
199 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
200
201 if (!BN_sqr(r, a, ctx)) goto err;
202 if (!group->field_mod_func(r, r, &group->field, ctx))
203 goto err;
204
205 ret=1;
206 err:
207 if (ctx_new)
208 BN_CTX_free(ctx_new);
209 return ret;
210 }
211