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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 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
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
15 * distribution.
16 *
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/)"
21 *
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.
26 *
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.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 *
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 * ====================================================================
49 *
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).
53 *
54 */
55
56#include <openssl/err.h>
57
58#include "ec_lcl.h"
59
60
61const EC_METHOD *EC_GFp_mont_method(void)
62 {
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,
86 ec_GFp_simple_add,
87 ec_GFp_simple_dbl,
88 ec_GFp_simple_invert,
89 ec_GFp_simple_is_at_infinity,
90 ec_GFp_simple_is_on_curve,
91 ec_GFp_simple_cmp,
92 ec_GFp_simple_make_affine,
93 ec_GFp_simple_points_make_affine,
94 ec_GFp_mont_field_mul,
95 ec_GFp_mont_field_sqr,
96 ec_GFp_mont_field_encode,
97 ec_GFp_mont_field_decode,
98 ec_GFp_mont_field_set_to_one };
99
100 return &ret;
101 }
102
103
104int ec_GFp_mont_group_init(EC_GROUP *group)
105 {
106 int ok;
107
108 ok = ec_GFp_simple_group_init(group);
109 group->field_data1 = NULL;
110 group->field_data2 = NULL;
111 return ok;
112 }
113
114
115int ec_GFp_mont_group_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
116 {
117 BN_CTX *new_ctx = NULL;
118 BN_MONT_CTX *mont = NULL;
119 BIGNUM *one = NULL;
120 int ret = 0;
121
122 if (group->field_data1 != NULL)
123 {
124 BN_MONT_CTX_free(group->field_data1);
125 group->field_data1 = NULL;
126 }
127 if (group->field_data2 != NULL)
128 {
129 BN_free(group->field_data2);
130 group->field_data2 = NULL;
131 }
132
133 if (ctx == NULL)
134 {
135 ctx = new_ctx = BN_CTX_new();
136 if (ctx == NULL)
137 return 0;
138 }
139
140 mont = BN_MONT_CTX_new();
141 if (mont == NULL) goto err;
142 if (!BN_MONT_CTX_set(mont, p, ctx))
143 {
144 ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE_GFP, ERR_R_BN_LIB);
145 goto err;
146 }
147 one = BN_new();
148 if (one == NULL) goto err;
149 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
150
151 group->field_data1 = mont;
152 mont = NULL;
153 group->field_data2 = one;
154 one = NULL;
155
156 ret = ec_GFp_simple_group_set_curve_GFp(group, p, a, b, ctx);
157
158 if (!ret)
159 {
160 BN_MONT_CTX_free(group->field_data1);
161 group->field_data1 = NULL;
162 BN_free(group->field_data2);
163 group->field_data2 = NULL;
164 }
165
166 err:
167 if (new_ctx != NULL)
168 BN_CTX_free(new_ctx);
169 if (mont != NULL)
170 BN_MONT_CTX_free(mont);
171 return ret;
172 }
173
174
175void ec_GFp_mont_group_finish(EC_GROUP *group)
176 {
177 if (group->field_data1 != NULL)
178 {
179 BN_MONT_CTX_free(group->field_data1);
180 group->field_data1 = NULL;
181 }
182 if (group->field_data2 != NULL)
183 {
184 BN_free(group->field_data2);
185 group->field_data2 = NULL;
186 }
187 ec_GFp_simple_group_finish(group);
188 }
189
190
191void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
192 {
193 if (group->field_data1 != NULL)
194 {
195 BN_MONT_CTX_free(group->field_data1);
196 group->field_data1 = NULL;
197 }
198 if (group->field_data2 != NULL)
199 {
200 BN_clear_free(group->field_data2);
201 group->field_data2 = NULL;
202 }
203 ec_GFp_simple_group_clear_finish(group);
204 }
205
206
207int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
208 {
209 if (dest->field_data1 != NULL)
210 {
211 BN_MONT_CTX_free(dest->field_data1);
212 dest->field_data1 = NULL;
213 }
214 if (dest->field_data2 != NULL)
215 {
216 BN_clear_free(dest->field_data2);
217 dest->field_data2 = NULL;
218 }
219
220 if (!ec_GFp_simple_group_copy(dest, src)) return 0;
221
222 if (src->field_data1 != NULL)
223 {
224 dest->field_data1 = BN_MONT_CTX_new();
225 if (dest->field_data1 == NULL) return 0;
226 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
227 }
228 if (src->field_data2 != NULL)
229 {
230 dest->field_data2 = BN_dup(src->field_data2);
231 if (dest->field_data2 == NULL) goto err;
232 }
233
234 return 1;
235
236 err:
237 if (dest->field_data1 != NULL)
238 {
239 BN_MONT_CTX_free(dest->field_data1);
240 dest->field_data1 = NULL;
241 }
242 return 0;
243 }
244
245
246int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
247 {
248 if (group->field_data1 == NULL)
249 {
250 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
251 return 0;
252 }
253
254 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
255 }
256
257
258int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
259 {
260 if (group->field_data1 == NULL)
261 {
262 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
263 return 0;
264 }
265
266 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
267 }
268
269
270int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
271 {
272 if (group->field_data1 == NULL)
273 {
274 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
275 return 0;
276 }
277
278 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
279 }
280
281
282int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
283 {
284 if (group->field_data1 == NULL)
285 {
286 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
287 return 0;
288 }
289
290 return BN_from_montgomery(r, a, group->field_data1, ctx);
291 }
292
293
294int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
295 {
296 if (group->field_data2 == NULL)
297 {
298 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
299 return 0;
300 }
301
302 if (!BN_copy(r, group->field_data2)) return 0;
303 return 1;
304 }
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