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diff --git a/src/lib/libcrypto/ec/ecp_mont.c b/src/lib/libcrypto/ec/ecp_mont.c
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1/* crypto/ec/ecp_mont.c */
2/*
3 * Originally written by Bodo Moeller for the OpenSSL project.
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2001 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 <openssl/err.h>
65
66#ifdef OPENSSL_FIPS
67#include <openssl/fips.h>
68#endif
69
70#include "ec_lcl.h"
71
72
73const EC_METHOD *EC_GFp_mont_method(void)
74 {
75#ifdef OPENSSL_FIPS
76 return fips_ec_gfp_mont_method();
77#else
78 static const EC_METHOD ret = {
79 EC_FLAGS_DEFAULT_OCT,
80 NID_X9_62_prime_field,
81 ec_GFp_mont_group_init,
82 ec_GFp_mont_group_finish,
83 ec_GFp_mont_group_clear_finish,
84 ec_GFp_mont_group_copy,
85 ec_GFp_mont_group_set_curve,
86 ec_GFp_simple_group_get_curve,
87 ec_GFp_simple_group_get_degree,
88 ec_GFp_simple_group_check_discriminant,
89 ec_GFp_simple_point_init,
90 ec_GFp_simple_point_finish,
91 ec_GFp_simple_point_clear_finish,
92 ec_GFp_simple_point_copy,
93 ec_GFp_simple_point_set_to_infinity,
94 ec_GFp_simple_set_Jprojective_coordinates_GFp,
95 ec_GFp_simple_get_Jprojective_coordinates_GFp,
96 ec_GFp_simple_point_set_affine_coordinates,
97 ec_GFp_simple_point_get_affine_coordinates,
98 0,0,0,
99 ec_GFp_simple_add,
100 ec_GFp_simple_dbl,
101 ec_GFp_simple_invert,
102 ec_GFp_simple_is_at_infinity,
103 ec_GFp_simple_is_on_curve,
104 ec_GFp_simple_cmp,
105 ec_GFp_simple_make_affine,
106 ec_GFp_simple_points_make_affine,
107 0 /* mul */,
108 0 /* precompute_mult */,
109 0 /* have_precompute_mult */,
110 ec_GFp_mont_field_mul,
111 ec_GFp_mont_field_sqr,
112 0 /* field_div */,
113 ec_GFp_mont_field_encode,
114 ec_GFp_mont_field_decode,
115 ec_GFp_mont_field_set_to_one };
116
117
118 return &ret;
119#endif
120 }
121
122
123int ec_GFp_mont_group_init(EC_GROUP *group)
124 {
125 int ok;
126
127 ok = ec_GFp_simple_group_init(group);
128 group->field_data1 = NULL;
129 group->field_data2 = NULL;
130 return ok;
131 }
132
133
134void ec_GFp_mont_group_finish(EC_GROUP *group)
135 {
136 if (group->field_data1 != NULL)
137 {
138 BN_MONT_CTX_free(group->field_data1);
139 group->field_data1 = NULL;
140 }
141 if (group->field_data2 != NULL)
142 {
143 BN_free(group->field_data2);
144 group->field_data2 = NULL;
145 }
146 ec_GFp_simple_group_finish(group);
147 }
148
149
150void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
151 {
152 if (group->field_data1 != NULL)
153 {
154 BN_MONT_CTX_free(group->field_data1);
155 group->field_data1 = NULL;
156 }
157 if (group->field_data2 != NULL)
158 {
159 BN_clear_free(group->field_data2);
160 group->field_data2 = NULL;
161 }
162 ec_GFp_simple_group_clear_finish(group);
163 }
164
165
166int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
167 {
168 if (dest->field_data1 != NULL)
169 {
170 BN_MONT_CTX_free(dest->field_data1);
171 dest->field_data1 = NULL;
172 }
173 if (dest->field_data2 != NULL)
174 {
175 BN_clear_free(dest->field_data2);
176 dest->field_data2 = NULL;
177 }
178
179 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
180
181 if (src->field_data1 != NULL)
182 {
183 dest->field_data1 = BN_MONT_CTX_new();
184 if (dest->field_data1 == NULL) return 0;
185 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
186 }
187 if (src->field_data2 != NULL)
188 {
189 dest->field_data2 = BN_dup(src->field_data2);
190 if (dest->field_data2 == NULL) goto err;
191 }
192
193 return 1;
194
195 err:
196 if (dest->field_data1 != NULL)
197 {
198 BN_MONT_CTX_free(dest->field_data1);
199 dest->field_data1 = NULL;
200 }
201 return 0;
202 }
203
204
205int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
206 {
207 BN_CTX *new_ctx = NULL;
208 BN_MONT_CTX *mont = NULL;
209 BIGNUM *one = NULL;
210 int ret = 0;
211
212 if (group->field_data1 != NULL)
213 {
214 BN_MONT_CTX_free(group->field_data1);
215 group->field_data1 = NULL;
216 }
217 if (group->field_data2 != NULL)
218 {
219 BN_free(group->field_data2);
220 group->field_data2 = NULL;
221 }
222
223 if (ctx == NULL)
224 {
225 ctx = new_ctx = BN_CTX_new();
226 if (ctx == NULL)
227 return 0;
228 }
229
230 mont = BN_MONT_CTX_new();
231 if (mont == NULL) goto err;
232 if (!BN_MONT_CTX_set(mont, p, ctx))
233 {
234 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
235 goto err;
236 }
237 one = BN_new();
238 if (one == NULL) goto err;
239 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
240
241 group->field_data1 = mont;
242 mont = NULL;
243 group->field_data2 = one;
244 one = NULL;
245
246 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
247
248 if (!ret)
249 {
250 BN_MONT_CTX_free(group->field_data1);
251 group->field_data1 = NULL;
252 BN_free(group->field_data2);
253 group->field_data2 = NULL;
254 }
255
256 err:
257 if (new_ctx != NULL)
258 BN_CTX_free(new_ctx);
259 if (mont != NULL)
260 BN_MONT_CTX_free(mont);
261 return ret;
262 }
263
264
265int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
266 {
267 if (group->field_data1 == NULL)
268 {
269 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
270 return 0;
271 }
272
273 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
274 }
275
276
277int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
278 {
279 if (group->field_data1 == NULL)
280 {
281 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
282 return 0;
283 }
284
285 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
286 }
287
288
289int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
290 {
291 if (group->field_data1 == NULL)
292 {
293 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
294 return 0;
295 }
296
297 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
298 }
299
300
301int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
302 {
303 if (group->field_data1 == NULL)
304 {
305 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
306 return 0;
307 }
308
309 return BN_from_montgomery(r, a, group->field_data1, ctx);
310 }
311
312
313int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
314 {
315 if (group->field_data2 == NULL)
316 {
317 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
318 return 0;
319 }
320
321 if (!BN_copy(r, group->field_data2)) return 0;
322 return 1;
323 }
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