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Commit | Line | Data |
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35b73a1f | 1 | /* |
33388b44 | 2 | * Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved. |
aa8f3d76 | 3 | * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved |
f8fe20e0 | 4 | * |
a7f182b7 | 5 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
4f22f405 RS |
6 | * this file except in compliance with the License. You can obtain a copy |
7 | * in the file LICENSE in the source distribution or at | |
8 | * https://www.openssl.org/source/license.html | |
f8fe20e0 | 9 | */ |
4f22f405 | 10 | |
579422c8 P |
11 | /* |
12 | * ECDSA low level APIs are deprecated for public use, but still ok for | |
13 | * internal use. | |
14 | */ | |
15 | #include "internal/deprecated.h" | |
16 | ||
156e8557 BM |
17 | #include <openssl/err.h> |
18 | ||
706457b7 | 19 | #include "ec_local.h" |
0657bf9c | 20 | |
0657bf9c | 21 | const EC_METHOD *EC_GFp_mont_method(void) |
0f113f3e MC |
22 | { |
23 | static const EC_METHOD ret = { | |
24 | EC_FLAGS_DEFAULT_OCT, | |
25 | NID_X9_62_prime_field, | |
26 | ec_GFp_mont_group_init, | |
27 | ec_GFp_mont_group_finish, | |
28 | ec_GFp_mont_group_clear_finish, | |
29 | ec_GFp_mont_group_copy, | |
30 | ec_GFp_mont_group_set_curve, | |
31 | ec_GFp_simple_group_get_curve, | |
32 | ec_GFp_simple_group_get_degree, | |
9ff9bccc | 33 | ec_group_simple_order_bits, |
0f113f3e MC |
34 | ec_GFp_simple_group_check_discriminant, |
35 | ec_GFp_simple_point_init, | |
36 | ec_GFp_simple_point_finish, | |
37 | ec_GFp_simple_point_clear_finish, | |
38 | ec_GFp_simple_point_copy, | |
39 | ec_GFp_simple_point_set_to_infinity, | |
0f113f3e MC |
40 | ec_GFp_simple_point_set_affine_coordinates, |
41 | ec_GFp_simple_point_get_affine_coordinates, | |
42 | 0, 0, 0, | |
43 | ec_GFp_simple_add, | |
44 | ec_GFp_simple_dbl, | |
45 | ec_GFp_simple_invert, | |
46 | ec_GFp_simple_is_at_infinity, | |
47 | ec_GFp_simple_is_on_curve, | |
48 | ec_GFp_simple_cmp, | |
49 | ec_GFp_simple_make_affine, | |
50 | ec_GFp_simple_points_make_affine, | |
51 | 0 /* mul */ , | |
52 | 0 /* precompute_mult */ , | |
53 | 0 /* have_precompute_mult */ , | |
54 | ec_GFp_mont_field_mul, | |
55 | ec_GFp_mont_field_sqr, | |
56 | 0 /* field_div */ , | |
e0033efc | 57 | ec_GFp_mont_field_inv, |
0f113f3e MC |
58 | ec_GFp_mont_field_encode, |
59 | ec_GFp_mont_field_decode, | |
9ff9bccc DSH |
60 | ec_GFp_mont_field_set_to_one, |
61 | ec_key_simple_priv2oct, | |
62 | ec_key_simple_oct2priv, | |
63 | 0, /* set private */ | |
64 | ec_key_simple_generate_key, | |
65 | ec_key_simple_check_key, | |
66 | ec_key_simple_generate_public_key, | |
67 | 0, /* keycopy */ | |
68 | 0, /* keyfinish */ | |
f667820c | 69 | ecdh_simple_compute_key, |
9bf682f6 PS |
70 | ecdsa_simple_sign_setup, |
71 | ecdsa_simple_sign_sig, | |
72 | ecdsa_simple_verify_sig, | |
f667820c | 73 | 0, /* field_inverse_mod_ord */ |
37124360 | 74 | ec_GFp_simple_blind_coordinates, |
9d91530d BB |
75 | ec_GFp_simple_ladder_pre, |
76 | ec_GFp_simple_ladder_step, | |
77 | ec_GFp_simple_ladder_post | |
0f113f3e MC |
78 | }; |
79 | ||
80 | return &ret; | |
81 | } | |
60428dbf BM |
82 | |
83 | int ec_GFp_mont_group_init(EC_GROUP *group) | |
0f113f3e MC |
84 | { |
85 | int ok; | |
60428dbf | 86 | |
0f113f3e MC |
87 | ok = ec_GFp_simple_group_init(group); |
88 | group->field_data1 = NULL; | |
89 | group->field_data2 = NULL; | |
90 | return ok; | |
91 | } | |
60428dbf | 92 | |
156e8557 | 93 | void ec_GFp_mont_group_finish(EC_GROUP *group) |
0f113f3e | 94 | { |
23a1d5e9 RS |
95 | BN_MONT_CTX_free(group->field_data1); |
96 | group->field_data1 = NULL; | |
97 | BN_free(group->field_data2); | |
98 | group->field_data2 = NULL; | |
0f113f3e MC |
99 | ec_GFp_simple_group_finish(group); |
100 | } | |
60428dbf | 101 | |
156e8557 | 102 | void ec_GFp_mont_group_clear_finish(EC_GROUP *group) |
0f113f3e | 103 | { |
23a1d5e9 RS |
104 | BN_MONT_CTX_free(group->field_data1); |
105 | group->field_data1 = NULL; | |
106 | BN_clear_free(group->field_data2); | |
107 | group->field_data2 = NULL; | |
0f113f3e MC |
108 | ec_GFp_simple_group_clear_finish(group); |
109 | } | |
60428dbf | 110 | |
156e8557 | 111 | int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) |
0f113f3e | 112 | { |
23a1d5e9 RS |
113 | BN_MONT_CTX_free(dest->field_data1); |
114 | dest->field_data1 = NULL; | |
115 | BN_clear_free(dest->field_data2); | |
116 | dest->field_data2 = NULL; | |
0f113f3e MC |
117 | |
118 | if (!ec_GFp_simple_group_copy(dest, src)) | |
119 | return 0; | |
120 | ||
121 | if (src->field_data1 != NULL) { | |
122 | dest->field_data1 = BN_MONT_CTX_new(); | |
123 | if (dest->field_data1 == NULL) | |
124 | return 0; | |
125 | if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) | |
126 | goto err; | |
127 | } | |
128 | if (src->field_data2 != NULL) { | |
129 | dest->field_data2 = BN_dup(src->field_data2); | |
130 | if (dest->field_data2 == NULL) | |
131 | goto err; | |
132 | } | |
133 | ||
134 | return 1; | |
48fe4d62 BM |
135 | |
136 | err: | |
23a1d5e9 RS |
137 | BN_MONT_CTX_free(dest->field_data1); |
138 | dest->field_data1 = NULL; | |
0f113f3e MC |
139 | return 0; |
140 | } | |
141 | ||
142 | int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, | |
143 | const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) | |
144 | { | |
145 | BN_CTX *new_ctx = NULL; | |
146 | BN_MONT_CTX *mont = NULL; | |
147 | BIGNUM *one = NULL; | |
148 | int ret = 0; | |
149 | ||
23a1d5e9 RS |
150 | BN_MONT_CTX_free(group->field_data1); |
151 | group->field_data1 = NULL; | |
152 | BN_free(group->field_data2); | |
153 | group->field_data2 = NULL; | |
0f113f3e MC |
154 | |
155 | if (ctx == NULL) { | |
a9612d6c | 156 | ctx = new_ctx = BN_CTX_new_ex(group->libctx); |
0f113f3e MC |
157 | if (ctx == NULL) |
158 | return 0; | |
159 | } | |
160 | ||
161 | mont = BN_MONT_CTX_new(); | |
162 | if (mont == NULL) | |
163 | goto err; | |
164 | if (!BN_MONT_CTX_set(mont, p, ctx)) { | |
9311d0c4 | 165 | ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB); |
0f113f3e MC |
166 | goto err; |
167 | } | |
168 | one = BN_new(); | |
169 | if (one == NULL) | |
170 | goto err; | |
171 | if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) | |
172 | goto err; | |
173 | ||
174 | group->field_data1 = mont; | |
175 | mont = NULL; | |
176 | group->field_data2 = one; | |
177 | one = NULL; | |
178 | ||
179 | ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); | |
180 | ||
181 | if (!ret) { | |
182 | BN_MONT_CTX_free(group->field_data1); | |
183 | group->field_data1 = NULL; | |
184 | BN_free(group->field_data2); | |
185 | group->field_data2 = NULL; | |
186 | } | |
46633554 BM |
187 | |
188 | err: | |
563c1ec6 | 189 | BN_free(one); |
23a1d5e9 RS |
190 | BN_CTX_free(new_ctx); |
191 | BN_MONT_CTX_free(mont); | |
0f113f3e MC |
192 | return ret; |
193 | } | |
194 | ||
195 | int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, | |
196 | const BIGNUM *b, BN_CTX *ctx) | |
197 | { | |
198 | if (group->field_data1 == NULL) { | |
9311d0c4 | 199 | ERR_raise(ERR_LIB_EC, EC_R_NOT_INITIALIZED); |
0f113f3e MC |
200 | return 0; |
201 | } | |
202 | ||
203 | return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); | |
204 | } | |
205 | ||
206 | int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, | |
207 | BN_CTX *ctx) | |
208 | { | |
209 | if (group->field_data1 == NULL) { | |
9311d0c4 | 210 | ERR_raise(ERR_LIB_EC, EC_R_NOT_INITIALIZED); |
0f113f3e MC |
211 | return 0; |
212 | } | |
213 | ||
214 | return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); | |
215 | } | |
216 | ||
e0033efc BB |
217 | /*- |
218 | * Computes the multiplicative inverse of a in GF(p), storing the result in r. | |
219 | * If a is zero (or equivalent), you'll get a EC_R_CANNOT_INVERT error. | |
220 | * We have a Mont structure, so SCA hardening is FLT inversion. | |
221 | */ | |
222 | int ec_GFp_mont_field_inv(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, | |
223 | BN_CTX *ctx) | |
224 | { | |
225 | BIGNUM *e = NULL; | |
226 | BN_CTX *new_ctx = NULL; | |
227 | int ret = 0; | |
228 | ||
229 | if (group->field_data1 == NULL) | |
230 | return 0; | |
231 | ||
a9612d6c MC |
232 | if (ctx == NULL |
233 | && (ctx = new_ctx = BN_CTX_secure_new_ex(group->libctx)) == NULL) | |
e0033efc BB |
234 | return 0; |
235 | ||
236 | BN_CTX_start(ctx); | |
237 | if ((e = BN_CTX_get(ctx)) == NULL) | |
238 | goto err; | |
239 | ||
240 | /* Inverse in constant time with Fermats Little Theorem */ | |
241 | if (!BN_set_word(e, 2)) | |
242 | goto err; | |
243 | if (!BN_sub(e, group->field, e)) | |
244 | goto err; | |
245 | /*- | |
246 | * Exponent e is public. | |
247 | * No need for scatter-gather or BN_FLG_CONSTTIME. | |
248 | */ | |
249 | if (!BN_mod_exp_mont(r, a, e, group->field, ctx, group->field_data1)) | |
250 | goto err; | |
251 | ||
252 | /* throw an error on zero */ | |
253 | if (BN_is_zero(r)) { | |
9311d0c4 | 254 | ERR_raise(ERR_LIB_EC, EC_R_CANNOT_INVERT); |
e0033efc BB |
255 | goto err; |
256 | } | |
257 | ||
258 | ret = 1; | |
259 | ||
260 | err: | |
261 | BN_CTX_end(ctx); | |
262 | BN_CTX_free(new_ctx); | |
263 | return ret; | |
264 | } | |
265 | ||
0f113f3e MC |
266 | int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, |
267 | const BIGNUM *a, BN_CTX *ctx) | |
268 | { | |
269 | if (group->field_data1 == NULL) { | |
9311d0c4 | 270 | ERR_raise(ERR_LIB_EC, EC_R_NOT_INITIALIZED); |
0f113f3e MC |
271 | return 0; |
272 | } | |
273 | ||
274 | return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); | |
275 | } | |
276 | ||
277 | int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, | |
278 | const BIGNUM *a, BN_CTX *ctx) | |
279 | { | |
280 | if (group->field_data1 == NULL) { | |
9311d0c4 | 281 | ERR_raise(ERR_LIB_EC, EC_R_NOT_INITIALIZED); |
0f113f3e MC |
282 | return 0; |
283 | } | |
284 | ||
285 | return BN_from_montgomery(r, a, group->field_data1, ctx); | |
286 | } | |
287 | ||
288 | int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, | |
289 | BN_CTX *ctx) | |
290 | { | |
291 | if (group->field_data2 == NULL) { | |
9311d0c4 | 292 | ERR_raise(ERR_LIB_EC, EC_R_NOT_INITIALIZED); |
0f113f3e MC |
293 | return 0; |
294 | } | |
295 | ||
296 | if (!BN_copy(r, group->field_data2)) | |
297 | return 0; | |
298 | return 1; | |
299 | } |