2 * Written by Nils Larsch for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
57 /* ====================================================================
58 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
59 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
60 * and contributed to the OpenSSL project.
65 #include <openssl/err.h>
66 #include <openssl/obj_mac.h>
69 const EC_METHOD *EC_GFp_nist_method(void)
71 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,
95 ec_GFp_simple_is_at_infinity,
96 ec_GFp_simple_is_on_curve,
98 ec_GFp_simple_make_affine,
99 ec_GFp_simple_points_make_affine,
101 0 /* precompute_mult */ ,
102 0 /* have_precompute_mult */ ,
103 ec_GFp_nist_field_mul,
104 ec_GFp_nist_field_sqr,
106 0 /* field_encode */ ,
107 0 /* field_decode */ ,
108 0 /* field_set_to_one */
114 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
116 dest->field_mod_func = src->field_mod_func;
118 return ec_GFp_simple_group_copy(dest, src);
121 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
122 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
125 BN_CTX *new_ctx = NULL;
128 if ((ctx = new_ctx = BN_CTX_new()) == NULL)
133 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
134 group->field_mod_func = BN_nist_mod_192;
135 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
136 group->field_mod_func = BN_nist_mod_224;
137 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
138 group->field_mod_func = BN_nist_mod_256;
139 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
140 group->field_mod_func = BN_nist_mod_384;
141 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
142 group->field_mod_func = BN_nist_mod_521;
144 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);
148 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
152 BN_CTX_free(new_ctx);
156 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
157 const BIGNUM *b, BN_CTX *ctx)
160 BN_CTX *ctx_new = NULL;
162 if (!group || !r || !a || !b) {
163 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
167 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
170 if (!BN_mul(r, a, b, ctx))
172 if (!group->field_mod_func(r, r, group->field, ctx))
177 BN_CTX_free(ctx_new);
181 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
185 BN_CTX *ctx_new = NULL;
187 if (!group || !r || !a) {
188 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
192 if ((ctx_new = ctx = BN_CTX_new()) == NULL)
195 if (!BN_sqr(r, a, ctx))
197 if (!group->field_mod_func(r, r, group->field, ctx))
202 BN_CTX_free(ctx_new);