Line data Source code
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 :
74 1242 : 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 :
116 : #ifdef OPENSSL_FIPS
117 : if (FIPS_mode())
118 : return fips_ec_gfp_nist_method();
119 : #endif
120 :
121 1242 : return &ret;
122 : }
123 :
124 3102 : int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
125 : {
126 3102 : dest->field_mod_func = src->field_mod_func;
127 :
128 3102 : return ec_GFp_simple_group_copy(dest, src);
129 : }
130 :
131 1242 : int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
132 : const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
133 : {
134 : int ret = 0;
135 : BN_CTX *new_ctx = NULL;
136 : BIGNUM *tmp_bn;
137 :
138 1242 : if (ctx == NULL)
139 0 : if ((ctx = new_ctx = BN_CTX_new()) == NULL)
140 : return 0;
141 :
142 1242 : BN_CTX_start(ctx);
143 1242 : if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
144 : goto err;
145 :
146 1242 : if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
147 0 : group->field_mod_func = BN_nist_mod_192;
148 1242 : else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
149 0 : group->field_mod_func = BN_nist_mod_224;
150 1242 : else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
151 1242 : group->field_mod_func = BN_nist_mod_256;
152 0 : else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
153 0 : group->field_mod_func = BN_nist_mod_384;
154 0 : else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
155 0 : group->field_mod_func = BN_nist_mod_521;
156 : else {
157 0 : ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
158 0 : goto err;
159 : }
160 :
161 1242 : ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
162 :
163 : err:
164 1242 : BN_CTX_end(ctx);
165 1242 : if (new_ctx != NULL)
166 0 : BN_CTX_free(new_ctx);
167 1242 : return ret;
168 : }
169 :
170 3468317 : int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
171 : const BIGNUM *b, BN_CTX *ctx)
172 : {
173 : int ret = 0;
174 : BN_CTX *ctx_new = NULL;
175 :
176 3468317 : if (!group || !r || !a || !b) {
177 0 : ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
178 0 : goto err;
179 : }
180 3468317 : if (!ctx)
181 0 : if ((ctx_new = ctx = BN_CTX_new()) == NULL)
182 : goto err;
183 :
184 3468317 : if (!BN_mul(r, a, b, ctx))
185 : goto err;
186 3468317 : if (!group->field_mod_func(r, r, &group->field, ctx))
187 : goto err;
188 :
189 : ret = 1;
190 : err:
191 3468317 : if (ctx_new)
192 0 : BN_CTX_free(ctx_new);
193 3468317 : return ret;
194 : }
195 :
196 2790671 : int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
197 : BN_CTX *ctx)
198 : {
199 : int ret = 0;
200 : BN_CTX *ctx_new = NULL;
201 :
202 2790671 : if (!group || !r || !a) {
203 0 : ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
204 0 : goto err;
205 : }
206 2790671 : if (!ctx)
207 0 : if ((ctx_new = ctx = BN_CTX_new()) == NULL)
208 : goto err;
209 :
210 2790671 : if (!BN_sqr(r, a, ctx))
211 : goto err;
212 2790671 : if (!group->field_mod_func(r, r, &group->field, ctx))
213 : goto err;
214 :
215 : ret = 1;
216 : err:
217 2790671 : if (ctx_new)
218 0 : BN_CTX_free(ctx_new);
219 2790671 : return ret;
220 : }
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