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).
55 /* ====================================================================
56 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
57 * Portions of this software developed by SUN MICROSYSTEMS, INC.,
58 * and contributed to the OpenSSL project.
61 #include <openssl/err.h>
66 const EC_METHOD *EC_GFp_mont_method(void)
68 static const EC_METHOD ret = {
69 NID_X9_62_prime_field,
70 ec_GFp_mont_group_init,
71 ec_GFp_mont_group_finish,
72 ec_GFp_mont_group_clear_finish,
73 ec_GFp_mont_group_copy,
74 ec_GFp_mont_group_set_curve_GFp,
75 ec_GFp_simple_group_get_curve_GFp,
76 ec_GFp_simple_group_get_degree,
77 ec_GFp_simple_group_check_discriminant,
78 ec_GFp_simple_point_init,
79 ec_GFp_simple_point_finish,
80 ec_GFp_simple_point_clear_finish,
81 ec_GFp_simple_point_copy,
82 ec_GFp_simple_point_set_to_infinity,
83 ec_GFp_simple_set_Jprojective_coordinates_GFp,
84 ec_GFp_simple_get_Jprojective_coordinates_GFp,
85 ec_GFp_simple_point_set_affine_coordinates_GFp,
86 ec_GFp_simple_point_get_affine_coordinates_GFp,
87 ec_GFp_simple_set_compressed_coordinates_GFp,
88 ec_GFp_simple_point2oct,
89 ec_GFp_simple_oct2point,
94 0 /* precompute_mult */,
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,
100 ec_GFp_mont_field_mul,
101 ec_GFp_mont_field_sqr,
103 ec_GFp_mont_field_encode,
104 ec_GFp_mont_field_decode,
105 ec_GFp_mont_field_set_to_one };
111 int ec_GFp_mont_group_init(EC_GROUP *group)
115 ok = ec_GFp_simple_group_init(group);
116 group->field_data1 = NULL;
117 group->field_data2 = NULL;
122 int ec_GFp_mont_group_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
124 BN_CTX *new_ctx = NULL;
125 BN_MONT_CTX *mont = NULL;
129 if (group->field_data1 != NULL)
131 BN_MONT_CTX_free(group->field_data1);
132 group->field_data1 = NULL;
134 if (group->field_data2 != NULL)
136 BN_free(group->field_data2);
137 group->field_data2 = NULL;
142 ctx = new_ctx = BN_CTX_new();
147 mont = BN_MONT_CTX_new();
148 if (mont == NULL) goto err;
149 if (!BN_MONT_CTX_set(mont, p, ctx))
151 ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE_GFP, ERR_R_BN_LIB);
155 if (one == NULL) goto err;
156 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
158 group->field_data1 = mont;
160 group->field_data2 = one;
163 ret = ec_GFp_simple_group_set_curve_GFp(group, p, a, b, ctx);
167 BN_MONT_CTX_free(group->field_data1);
168 group->field_data1 = NULL;
169 BN_free(group->field_data2);
170 group->field_data2 = NULL;
175 BN_CTX_free(new_ctx);
177 BN_MONT_CTX_free(mont);
182 void ec_GFp_mont_group_finish(EC_GROUP *group)
184 if (group->field_data1 != NULL)
186 BN_MONT_CTX_free(group->field_data1);
187 group->field_data1 = NULL;
189 if (group->field_data2 != NULL)
191 BN_free(group->field_data2);
192 group->field_data2 = NULL;
194 ec_GFp_simple_group_finish(group);
198 void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
200 if (group->field_data1 != NULL)
202 BN_MONT_CTX_free(group->field_data1);
203 group->field_data1 = NULL;
205 if (group->field_data2 != NULL)
207 BN_clear_free(group->field_data2);
208 group->field_data2 = NULL;
210 ec_GFp_simple_group_clear_finish(group);
214 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
216 if (dest->field_data1 != NULL)
218 BN_MONT_CTX_free(dest->field_data1);
219 dest->field_data1 = NULL;
221 if (dest->field_data2 != NULL)
223 BN_clear_free(dest->field_data2);
224 dest->field_data2 = NULL;
227 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
229 if (src->field_data1 != NULL)
231 dest->field_data1 = BN_MONT_CTX_new();
232 if (dest->field_data1 == NULL) return 0;
233 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
235 if (src->field_data2 != NULL)
237 dest->field_data2 = BN_dup(src->field_data2);
238 if (dest->field_data2 == NULL) goto err;
244 if (dest->field_data1 != NULL)
246 BN_MONT_CTX_free(dest->field_data1);
247 dest->field_data1 = NULL;
253 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
255 if (group->field_data1 == NULL)
257 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
261 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
265 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
267 if (group->field_data1 == NULL)
269 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
273 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
277 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
279 if (group->field_data1 == NULL)
281 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
285 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
289 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
291 if (group->field_data1 == NULL)
293 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
297 return BN_from_montgomery(r, a, group->field_data1, ctx);
301 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
303 if (group->field_data2 == NULL)
305 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
309 if (!BN_copy(r, group->field_data2)) return 0;