1 /* crypto/ec/ecp_nist.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
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.
64 #include <openssl/err.h>
65 #include <openssl/obj_mac.h>
68 const EC_METHOD *EC_GFp_nist_method(void)
70 static const EC_METHOD ret = {
71 NID_X9_62_prime_field,
72 ec_GFp_nist_group_init,
73 ec_GFp_nist_group_finish,
74 ec_GFp_nist_group_clear_finish,
75 ec_GFp_nist_group_copy,
76 ec_GFp_nist_group_set_curve,
77 ec_GFp_simple_group_get_curve,
78 ec_GFp_simple_group_get_degree,
79 ec_GFp_simple_group_check_discriminant,
80 ec_GFp_simple_point_init,
81 ec_GFp_simple_point_finish,
82 ec_GFp_simple_point_clear_finish,
83 ec_GFp_simple_point_copy,
84 ec_GFp_simple_point_set_to_infinity,
85 ec_GFp_simple_set_Jprojective_coordinates_GFp,
86 ec_GFp_simple_get_Jprojective_coordinates_GFp,
87 ec_GFp_simple_point_set_affine_coordinates,
88 ec_GFp_simple_point_get_affine_coordinates,
89 ec_GFp_simple_set_compressed_coordinates,
90 ec_GFp_simple_point2oct,
91 ec_GFp_simple_oct2point,
96 0 /* precompute_mult */,
97 ec_GFp_simple_is_at_infinity,
98 ec_GFp_simple_is_on_curve,
100 ec_GFp_simple_make_affine,
101 ec_GFp_simple_points_make_affine,
102 ec_GFp_nist_field_mul,
103 ec_GFp_nist_field_sqr,
105 0 /* field_encode */,
106 0 /* field_decode */,
107 0 /* field_set_to_one */ };
112 #if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL
113 #define NO_32_BIT_TYPE
116 int ec_GFp_nist_group_init(EC_GROUP *group)
120 ok = ec_GFp_simple_group_init(group);
121 group->field_data1 = NULL;
125 void ec_GFp_nist_group_finish(EC_GROUP *group)
127 BN_free(&group->field);
133 void ec_GFp_nist_group_clear_finish(EC_GROUP *group)
135 BN_clear_free(&group->field);
136 BN_clear_free(&group->a);
137 BN_clear_free(&group->b);
141 int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
142 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
145 BN_CTX *new_ctx = NULL;
149 if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
152 if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err;
154 if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
155 group->field_mod_func = BN_nist_mod_192;
156 else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
158 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
159 group->field_mod_func = BN_nist_mod_224;
161 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
165 else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
167 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
168 group->field_mod_func = BN_nist_mod_256;
170 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
174 else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
176 #if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
177 group->field_mod_func = BN_nist_mod_384;
179 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
183 else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
184 /* this one works in the NO_32_BIT_TYPE case */
185 group->field_mod_func = BN_nist_mod_521;
188 ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_NIST_PRIME);
193 if (!BN_copy(&group->field, p)) goto err;
194 group->field.neg = 0;
197 if (!group->field_mod_func(&group->a, a, p, ctx)) goto err;
200 if (!group->field_mod_func(&group->b, b, p, ctx)) goto err;
202 /* group->a_is_minus3 */
203 if (!BN_add_word(tmp_bn, 3)) goto err;
204 group->a_is_minus3 = (0 == BN_cmp(tmp_bn, &group->field));
211 BN_CTX_free(new_ctx);
215 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
217 if (dest == NULL || src == NULL)
220 if (!BN_copy(&dest->field, &src->field))
222 if (!BN_copy(&dest->a, &src->a))
224 if (!BN_copy(&dest->b, &src->b))
227 dest->curve_name = src->curve_name;
229 dest->a_is_minus3 = src->a_is_minus3;
231 dest->field_data1 = src->field_data1;
236 int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
237 const BIGNUM *b, BN_CTX *ctx)
240 BN_CTX *ctx_new=NULL;
242 if (!group || !r || !a || !b)
244 ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
248 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
250 if (!BN_mul(r, a, b, ctx)) goto err;
251 if (!group->field_mod_func(r, r, &group->field, ctx))
257 BN_CTX_free(ctx_new);
261 int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
265 BN_CTX *ctx_new=NULL;
267 if (!group || !r || !a)
269 ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
273 if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
275 if (!BN_sqr(r, a, ctx)) goto err;
276 if (!group->field_mod_func(r, r, &group->field, ctx))
282 BN_CTX_free(ctx_new);