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
70 #ifdef OPENSSL_FIPS
71 #include <openssl/fips.h>
72 #endif
73
EC_GFp_nist_method(void)74 const EC_METHOD *EC_GFp_nist_method(void)
75 {
76 static const EC_METHOD ret = {
77 EC_FLAGS_DEFAULT_OCT,
78 NID_X9_62_prime_field,
79 ec_GFp_simple_group_init,
80 ec_GFp_simple_group_finish,
81 ec_GFp_simple_group_clear_finish,
82 ec_GFp_nist_group_copy,
83 ec_GFp_nist_group_set_curve,
84 ec_GFp_simple_group_get_curve,
85 ec_GFp_simple_group_get_degree,
86 ec_GFp_simple_group_check_discriminant,
87 ec_GFp_simple_point_init,
88 ec_GFp_simple_point_finish,
89 ec_GFp_simple_point_clear_finish,
90 ec_GFp_simple_point_copy,
91 ec_GFp_simple_point_set_to_infinity,
92 ec_GFp_simple_set_Jprojective_coordinates_GFp,
93 ec_GFp_simple_get_Jprojective_coordinates_GFp,
94 ec_GFp_simple_point_set_affine_coordinates,
95 ec_GFp_simple_point_get_affine_coordinates,
96 0,0,0,
97 ec_GFp_simple_add,
98 ec_GFp_simple_dbl,
99 ec_GFp_simple_invert,
100 ec_GFp_simple_is_at_infinity,
101 ec_GFp_simple_is_on_curve,
102 ec_GFp_simple_cmp,
103 ec_GFp_simple_make_affine,
104 ec_GFp_simple_points_make_affine,
105 0 /* mul */,
106 0 /* precompute_mult */,
107 0 /* have_precompute_mult */,
108 ec_GFp_nist_field_mul,
109 ec_GFp_nist_field_sqr,
110 0 /* field_div */,
111 0 /* field_encode */,
112 0 /* field_decode */,
113 0 /* field_set_to_one */ };
114
115 #ifdef OPENSSL_FIPS
116 if (FIPS_mode())
117 return fips_ec_gfp_nist_method();
118 #endif
119
120 return &ret;
121 }
122
ec_GFp_nist_group_copy(EC_GROUP * dest,const EC_GROUP * src)123 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
124 {
125 dest->field_mod_func = src->field_mod_func;
126
127 return ec_GFp_simple_group_copy(dest, src);
128 }
129
ec_GFp_nist_group_set_curve(EC_GROUP * group,const BIGNUM * p,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)130 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
131 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
132 {
133 int ret = 0;
134 BN_CTX *new_ctx = NULL;
135 BIGNUM *tmp_bn;
136
137 if (ctx == NULL)
138 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
139
140 BN_CTX_start(ctx);
141 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) 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 {
155 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
156 goto err;
157 }
158
159 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
160
161 err:
162 BN_CTX_end(ctx);
163 if (new_ctx != NULL)
164 BN_CTX_free(new_ctx);
165 return ret;
166 }
167
168
ec_GFp_nist_field_mul(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,const BIGNUM * b,BN_CTX * ctx)169 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
170 const BIGNUM *b, BN_CTX *ctx)
171 {
172 int ret=0;
173 BN_CTX *ctx_new=NULL;
174
175 if (!group || !r || !a || !b)
176 {
177 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
178 goto err;
179 }
180 if (!ctx)
181 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
182
183 if (!BN_mul(r, a, b, ctx)) goto err;
184 if (!group->field_mod_func(r, r, &group->field, ctx))
185 goto err;
186
187 ret=1;
188 err:
189 if (ctx_new)
190 BN_CTX_free(ctx_new);
191 return ret;
192 }
193
194
ec_GFp_nist_field_sqr(const EC_GROUP * group,BIGNUM * r,const BIGNUM * a,BN_CTX * ctx)195 int 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 {
203 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
204 goto err;
205 }
206 if (!ctx)
207 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
208
209 if (!BN_sqr(r, a, ctx)) goto err;
210 if (!group->field_mod_func(r, r, &group->field, ctx))
211 goto err;
212
213 ret=1;
214 err:
215 if (ctx_new)
216 BN_CTX_free(ctx_new);
217 return ret;
218 }
219