1 /* crypto/ec/ecp_mont.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
56 #include <openssl/err.h>
61 const EC_METHOD *EC_GFp_mont_method(void)
63 static const EC_METHOD ret = {
64 ec_GFp_mont_group_init,
65 ec_GFp_mont_group_finish,
66 ec_GFp_mont_group_clear_finish,
67 ec_GFp_mont_group_copy,
68 ec_GFp_mont_group_set_curve_GFp,
69 ec_GFp_simple_group_get_curve_GFp,
70 ec_GFp_simple_group_set_generator,
71 ec_GFp_simple_group_get0_generator,
72 ec_GFp_simple_group_get_order,
73 ec_GFp_simple_group_get_cofactor,
74 ec_GFp_simple_point_init,
75 ec_GFp_simple_point_finish,
76 ec_GFp_simple_point_clear_finish,
77 ec_GFp_simple_point_copy,
78 ec_GFp_simple_point_set_to_infinity,
79 ec_GFp_simple_set_Jprojective_coordinates_GFp,
80 ec_GFp_simple_get_Jprojective_coordinates_GFp,
81 ec_GFp_simple_point_set_affine_coordinates_GFp,
82 ec_GFp_simple_point_get_affine_coordinates_GFp,
83 ec_GFp_simple_set_compressed_coordinates_GFp,
84 ec_GFp_simple_point2oct,
85 ec_GFp_simple_oct2point,
89 ec_GFp_simple_is_at_infinity,
90 ec_GFp_simple_is_on_curve,
92 ec_GFp_simple_make_affine,
93 ec_GFp_mont_field_mul,
94 ec_GFp_mont_field_sqr,
95 ec_GFp_mont_field_encode,
96 ec_GFp_mont_field_decode };
102 int ec_GFp_mont_group_init(EC_GROUP *group)
106 ok = ec_GFp_simple_group_init(group);
107 group->field_data = NULL;
112 int ec_GFp_mont_group_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
114 BN_CTX *new_ctx = NULL;
115 BN_MONT_CTX *mont = NULL;
118 if (group->field_data != NULL)
120 BN_MONT_CTX_free(group->field_data);
121 group->field_data = NULL;
126 ctx = new_ctx = BN_CTX_new();
131 mont = BN_MONT_CTX_new();
132 if (mont == NULL) goto err;
133 if (!BN_MONT_CTX_set(mont, p, ctx))
135 ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE_GFP, ERR_R_BN_LIB);
139 group->field_data = mont;
142 ret = ec_GFp_simple_group_set_curve_GFp(group, p, a, b, ctx);
146 BN_MONT_CTX_free(group->field_data);
147 group->field_data = NULL;
152 BN_CTX_free(new_ctx);
154 BN_MONT_CTX_free(mont);
159 void ec_GFp_mont_group_finish(EC_GROUP *group)
161 if (group->field_data != NULL)
163 BN_MONT_CTX_free(group->field_data);
164 group->field_data = NULL;
166 ec_GFp_simple_group_finish(group);
170 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
172 if (group->field_data != NULL)
174 BN_MONT_CTX_free(group->field_data);
175 group->field_data = NULL;
177 ec_GFp_simple_group_clear_finish(group);
181 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
183 if (dest->field_data != NULL)
185 BN_MONT_CTX_free(dest->field_data);
186 dest->field_data = NULL;
189 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
191 dest->field_data = BN_MONT_CTX_new();
192 if (dest->field_data == NULL) return 0;
193 if (!BN_MONT_CTX_copy(dest->field_data, src->field_data))
195 BN_MONT_CTX_free(dest->field_data);
196 dest->field_data = NULL;
204 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
206 if (group->field_data == NULL)
208 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
212 return BN_mod_mul_montgomery(r, a, b, group->field_data, ctx);
216 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
218 if (group->field_data == NULL)
220 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
224 return BN_mod_mul_montgomery(r, a, a, group->field_data, ctx);
228 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
230 if (group->field_data == NULL)
232 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
236 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data, ctx);
240 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
242 if (group->field_data == NULL)
244 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
248 return BN_from_montgomery(r, a, group->field_data, ctx);