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f8fe20e0 | 1 | /* crypto/ec/ecp_mont.c */ |
35b73a1f BM |
2 | /* |
3 | * Originally written by Bodo Moeller for the OpenSSL project. | |
4 | */ | |
f8fe20e0 BM |
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 | |
40720ce3 | 13 | * notice, this list of conditions and the following disclaimer. |
f8fe20e0 BM |
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 | */ | |
7793f30e BM |
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 | */ | |
f8fe20e0 | 63 | |
156e8557 BM |
64 | #include <openssl/err.h> |
65 | ||
f8fe20e0 | 66 | #include "ec_lcl.h" |
0657bf9c | 67 | |
0657bf9c | 68 | const EC_METHOD *EC_GFp_mont_method(void) |
40720ce3 MC |
69 | { |
70 | static const EC_METHOD ret = { | |
71 | NID_X9_62_prime_field, | |
72 | ec_GFp_mont_group_init, | |
73 | ec_GFp_mont_group_finish, | |
74 | ec_GFp_mont_group_clear_finish, | |
75 | ec_GFp_mont_group_copy, | |
76 | ec_GFp_mont_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, | |
92 | ec_GFp_simple_add, | |
93 | ec_GFp_simple_dbl, | |
94 | ec_GFp_simple_invert, | |
95 | ec_GFp_simple_is_at_infinity, | |
96 | ec_GFp_simple_is_on_curve, | |
97 | ec_GFp_simple_cmp, | |
98 | ec_GFp_simple_make_affine, | |
99 | ec_GFp_simple_points_make_affine, | |
100 | 0 /* mul */ , | |
101 | 0 /* precompute_mult */ , | |
102 | 0 /* have_precompute_mult */ , | |
103 | ec_GFp_mont_field_mul, | |
104 | ec_GFp_mont_field_sqr, | |
105 | 0 /* field_div */ , | |
106 | ec_GFp_mont_field_encode, | |
107 | ec_GFp_mont_field_decode, | |
108 | ec_GFp_mont_field_set_to_one | |
109 | }; | |
110 | ||
111 | return &ret; | |
112 | } | |
60428dbf BM |
113 | |
114 | int ec_GFp_mont_group_init(EC_GROUP *group) | |
40720ce3 MC |
115 | { |
116 | int ok; | |
60428dbf | 117 | |
40720ce3 MC |
118 | ok = ec_GFp_simple_group_init(group); |
119 | group->field_data1 = NULL; | |
120 | group->field_data2 = NULL; | |
121 | return ok; | |
122 | } | |
60428dbf | 123 | |
156e8557 | 124 | void ec_GFp_mont_group_finish(EC_GROUP *group) |
40720ce3 MC |
125 | { |
126 | if (group->field_data1 != NULL) { | |
127 | BN_MONT_CTX_free(group->field_data1); | |
128 | group->field_data1 = NULL; | |
129 | } | |
130 | if (group->field_data2 != NULL) { | |
131 | BN_free(group->field_data2); | |
132 | group->field_data2 = NULL; | |
133 | } | |
134 | ec_GFp_simple_group_finish(group); | |
135 | } | |
60428dbf | 136 | |
156e8557 | 137 | void ec_GFp_mont_group_clear_finish(EC_GROUP *group) |
40720ce3 MC |
138 | { |
139 | if (group->field_data1 != NULL) { | |
140 | BN_MONT_CTX_free(group->field_data1); | |
141 | group->field_data1 = NULL; | |
142 | } | |
143 | if (group->field_data2 != NULL) { | |
144 | BN_clear_free(group->field_data2); | |
145 | group->field_data2 = NULL; | |
146 | } | |
147 | ec_GFp_simple_group_clear_finish(group); | |
148 | } | |
60428dbf | 149 | |
156e8557 | 150 | int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) |
40720ce3 MC |
151 | { |
152 | if (dest->field_data1 != NULL) { | |
153 | BN_MONT_CTX_free(dest->field_data1); | |
154 | dest->field_data1 = NULL; | |
155 | } | |
156 | if (dest->field_data2 != NULL) { | |
157 | BN_clear_free(dest->field_data2); | |
158 | dest->field_data2 = NULL; | |
159 | } | |
160 | ||
161 | if (!ec_GFp_simple_group_copy(dest, src)) | |
162 | return 0; | |
163 | ||
164 | if (src->field_data1 != NULL) { | |
165 | dest->field_data1 = BN_MONT_CTX_new(); | |
166 | if (dest->field_data1 == NULL) | |
167 | return 0; | |
168 | if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) | |
169 | goto err; | |
170 | } | |
171 | if (src->field_data2 != NULL) { | |
172 | dest->field_data2 = BN_dup(src->field_data2); | |
173 | if (dest->field_data2 == NULL) | |
174 | goto err; | |
175 | } | |
176 | ||
177 | return 1; | |
48fe4d62 BM |
178 | |
179 | err: | |
40720ce3 MC |
180 | if (dest->field_data1 != NULL) { |
181 | BN_MONT_CTX_free(dest->field_data1); | |
182 | dest->field_data1 = NULL; | |
183 | } | |
184 | return 0; | |
185 | } | |
186 | ||
187 | int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, | |
188 | const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) | |
189 | { | |
190 | BN_CTX *new_ctx = NULL; | |
191 | BN_MONT_CTX *mont = NULL; | |
192 | BIGNUM *one = NULL; | |
193 | int ret = 0; | |
194 | ||
195 | if (group->field_data1 != NULL) { | |
196 | BN_MONT_CTX_free(group->field_data1); | |
197 | group->field_data1 = NULL; | |
198 | } | |
199 | if (group->field_data2 != NULL) { | |
200 | BN_free(group->field_data2); | |
201 | group->field_data2 = NULL; | |
202 | } | |
203 | ||
204 | if (ctx == NULL) { | |
205 | ctx = new_ctx = BN_CTX_new(); | |
206 | if (ctx == NULL) | |
207 | return 0; | |
208 | } | |
209 | ||
210 | mont = BN_MONT_CTX_new(); | |
211 | if (mont == NULL) | |
212 | goto err; | |
213 | if (!BN_MONT_CTX_set(mont, p, ctx)) { | |
214 | ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); | |
215 | goto err; | |
216 | } | |
217 | one = BN_new(); | |
218 | if (one == NULL) | |
219 | goto err; | |
220 | if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) | |
221 | goto err; | |
222 | ||
223 | group->field_data1 = mont; | |
224 | mont = NULL; | |
225 | group->field_data2 = one; | |
226 | one = NULL; | |
227 | ||
228 | ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); | |
229 | ||
230 | if (!ret) { | |
231 | BN_MONT_CTX_free(group->field_data1); | |
232 | group->field_data1 = NULL; | |
233 | BN_free(group->field_data2); | |
234 | group->field_data2 = NULL; | |
235 | } | |
46633554 BM |
236 | |
237 | err: | |
40720ce3 MC |
238 | if (new_ctx != NULL) |
239 | BN_CTX_free(new_ctx); | |
240 | if (mont != NULL) | |
241 | BN_MONT_CTX_free(mont); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, | |
246 | const BIGNUM *b, BN_CTX *ctx) | |
247 | { | |
248 | if (group->field_data1 == NULL) { | |
249 | ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); | |
254 | } | |
255 | ||
256 | int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, | |
257 | BN_CTX *ctx) | |
258 | { | |
259 | if (group->field_data1 == NULL) { | |
260 | ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); | |
265 | } | |
266 | ||
267 | int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, | |
268 | const BIGNUM *a, BN_CTX *ctx) | |
269 | { | |
270 | if (group->field_data1 == NULL) { | |
271 | ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); | |
276 | } | |
277 | ||
278 | int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, | |
279 | const BIGNUM *a, BN_CTX *ctx) | |
280 | { | |
281 | if (group->field_data1 == NULL) { | |
282 | ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | return BN_from_montgomery(r, a, group->field_data1, ctx); | |
287 | } | |
288 | ||
289 | int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, | |
290 | BN_CTX *ctx) | |
291 | { | |
292 | if (group->field_data2 == NULL) { | |
293 | ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | if (!BN_copy(r, group->field_data2)) | |
298 | return 0; | |
299 | return 1; | |
300 | } |