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diff --git a/src/lib/libcrypto/bn/bn_blind.c b/src/lib/libcrypto/bn/bn_blind.c
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1/* $OpenBSD: bn_blind.c,v 1.14 2014/07/12 16:03:36 miod Exp $ */
2/* ====================================================================
3 * Copyright (c) 1998-2006 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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
56 * All rights reserved.
57 *
58 * This package is an SSL implementation written
59 * by Eric Young (eay@cryptsoft.com).
60 * The implementation was written so as to conform with Netscapes SSL.
61 *
62 * This library is free for commercial and non-commercial use as long as
63 * the following conditions are aheared to. The following conditions
64 * apply to all code found in this distribution, be it the RC4, RSA,
65 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
66 * included with this distribution is covered by the same copyright terms
67 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
68 *
69 * Copyright remains Eric Young's, and as such any Copyright notices in
70 * the code are not to be removed.
71 * If this package is used in a product, Eric Young should be given attribution
72 * as the author of the parts of the library used.
73 * This can be in the form of a textual message at program startup or
74 * in documentation (online or textual) provided with the package.
75 *
76 * Redistribution and use in source and binary forms, with or without
77 * modification, are permitted provided that the following conditions
78 * are met:
79 * 1. Redistributions of source code must retain the copyright
80 * notice, this list of conditions and the following disclaimer.
81 * 2. Redistributions in binary form must reproduce the above copyright
82 * notice, this list of conditions and the following disclaimer in the
83 * documentation and/or other materials provided with the distribution.
84 * 3. All advertising materials mentioning features or use of this software
85 * must display the following acknowledgement:
86 * "This product includes cryptographic software written by
87 * Eric Young (eay@cryptsoft.com)"
88 * The word 'cryptographic' can be left out if the rouines from the library
89 * being used are not cryptographic related :-).
90 * 4. If you include any Windows specific code (or a derivative thereof) from
91 * the apps directory (application code) you must include an acknowledgement:
92 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
93 *
94 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
95 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
96 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
97 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
98 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
99 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
100 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
101 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
102 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
103 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
104 * SUCH DAMAGE.
105 *
106 * The licence and distribution terms for any publically available version or
107 * derivative of this code cannot be changed. i.e. this code cannot simply be
108 * copied and put under another distribution licence
109 * [including the GNU Public Licence.]
110 */
111
112#include <stdio.h>
113
114#include <openssl/opensslconf.h>
115
116#include <openssl/err.h>
117
118#include "bn_lcl.h"
119
120#define BN_BLINDING_COUNTER 32
121
122struct bn_blinding_st {
123 BIGNUM *A;
124 BIGNUM *Ai;
125 BIGNUM *e;
126 BIGNUM *mod; /* just a reference */
127#ifndef OPENSSL_NO_DEPRECATED
128 unsigned long thread_id; /* added in OpenSSL 0.9.6j and 0.9.7b;
129 * used only by crypto/rsa/rsa_eay.c, rsa_lib.c */
130#endif
131 CRYPTO_THREADID tid;
132 int counter;
133 unsigned long flags;
134 BN_MONT_CTX *m_ctx;
135 int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
136 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
137};
138
139BN_BLINDING *
140BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
141{
142 BN_BLINDING *ret = NULL;
143
144 bn_check_top(mod);
145
146 if ((ret = calloc(1, sizeof(BN_BLINDING))) == NULL) {
147 BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
148 return (NULL);
149 }
150 if (A != NULL) {
151 if ((ret->A = BN_dup(A)) == NULL)
152 goto err;
153 }
154 if (Ai != NULL) {
155 if ((ret->Ai = BN_dup(Ai)) == NULL)
156 goto err;
157 }
158
159 /* save a copy of mod in the BN_BLINDING structure */
160 if ((ret->mod = BN_dup(mod)) == NULL)
161 goto err;
162 if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0)
163 BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
164
165 /* Set the counter to the special value -1
166 * to indicate that this is never-used fresh blinding
167 * that does not need updating before first use. */
168 ret->counter = -1;
169 CRYPTO_THREADID_current(&ret->tid);
170 return (ret);
171
172err:
173 if (ret != NULL)
174 BN_BLINDING_free(ret);
175 return (NULL);
176}
177
178void
179BN_BLINDING_free(BN_BLINDING *r)
180{
181 if (r == NULL)
182 return;
183
184 BN_clear_free(r->A);
185 BN_clear_free(r->Ai);
186 BN_clear_free(r->e);
187 BN_clear_free(r->mod);
188 free(r);
189}
190
191int
192BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
193{
194 int ret = 0;
195
196 if ((b->A == NULL) || (b->Ai == NULL)) {
197 BNerr(BN_F_BN_BLINDING_UPDATE, BN_R_NOT_INITIALIZED);
198 goto err;
199 }
200
201 if (b->counter == -1)
202 b->counter = 0;
203
204 if (++b->counter == BN_BLINDING_COUNTER && b->e != NULL &&
205 !(b->flags & BN_BLINDING_NO_RECREATE)) {
206 /* re-create blinding parameters */
207 if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL))
208 goto err;
209 } else if (!(b->flags & BN_BLINDING_NO_UPDATE)) {
210 if (!BN_mod_mul(b->A, b->A, b->A, b->mod, ctx))
211 goto err;
212 if (!BN_mod_mul(b->Ai, b->Ai, b->Ai, b->mod, ctx))
213 goto err;
214 }
215
216 ret = 1;
217
218err:
219 if (b->counter == BN_BLINDING_COUNTER)
220 b->counter = 0;
221 return (ret);
222}
223
224int
225BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
226{
227 return BN_BLINDING_convert_ex(n, NULL, b, ctx);
228}
229
230int
231BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
232{
233 int ret = 1;
234
235 bn_check_top(n);
236
237 if ((b->A == NULL) || (b->Ai == NULL)) {
238 BNerr(BN_F_BN_BLINDING_CONVERT_EX, BN_R_NOT_INITIALIZED);
239 return (0);
240 }
241
242 if (b->counter == -1)
243 /* Fresh blinding, doesn't need updating. */
244 b->counter = 0;
245 else if (!BN_BLINDING_update(b, ctx))
246 return (0);
247
248 if (r != NULL) {
249 if (!BN_copy(r, b->Ai))
250 ret = 0;
251 }
252
253 if (!BN_mod_mul(n, n,b->A, b->mod, ctx))
254 ret = 0;
255
256 return ret;
257}
258
259int
260BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
261{
262 return BN_BLINDING_invert_ex(n, NULL, b, ctx);
263}
264
265int
266BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
267{
268 int ret;
269
270 bn_check_top(n);
271
272 if (r != NULL)
273 ret = BN_mod_mul(n, n, r, b->mod, ctx);
274 else {
275 if (b->Ai == NULL) {
276 BNerr(BN_F_BN_BLINDING_INVERT_EX, BN_R_NOT_INITIALIZED);
277 return (0);
278 }
279 ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx);
280 }
281
282 bn_check_top(n);
283 return (ret);
284}
285
286#ifndef OPENSSL_NO_DEPRECATED
287unsigned long
288BN_BLINDING_get_thread_id(const BN_BLINDING *b)
289{
290 return b->thread_id;
291}
292
293void
294BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n)
295{
296 b->thread_id = n;
297}
298#endif
299
300CRYPTO_THREADID *
301BN_BLINDING_thread_id(BN_BLINDING *b)
302{
303 return &b->tid;
304}
305
306unsigned long
307BN_BLINDING_get_flags(const BN_BLINDING *b)
308{
309 return b->flags;
310}
311
312void
313BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags)
314{
315 b->flags = flags;
316}
317
318BN_BLINDING *
319BN_BLINDING_create_param(BN_BLINDING *b, const BIGNUM *e, BIGNUM *m,
320 BN_CTX *ctx, int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
321 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), BN_MONT_CTX *m_ctx)
322{
323 int retry_counter = 32;
324 BN_BLINDING *ret = NULL;
325
326 if (b == NULL)
327 ret = BN_BLINDING_new(NULL, NULL, m);
328 else
329 ret = b;
330
331 if (ret == NULL)
332 goto err;
333
334 if (ret->A == NULL && (ret->A = BN_new()) == NULL)
335 goto err;
336 if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL)
337 goto err;
338
339 if (e != NULL) {
340 BN_free(ret->e);
341 ret->e = BN_dup(e);
342 }
343 if (ret->e == NULL)
344 goto err;
345
346 if (bn_mod_exp != NULL)
347 ret->bn_mod_exp = bn_mod_exp;
348 if (m_ctx != NULL)
349 ret->m_ctx = m_ctx;
350
351 do {
352 if (!BN_rand_range(ret->A, ret->mod))
353 goto err;
354 if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL) {
355 /* this should almost never happen for good RSA keys */
356 unsigned long error = ERR_peek_last_error();
357 if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
358 if (retry_counter-- == 0) {
359 BNerr(BN_F_BN_BLINDING_CREATE_PARAM,
360 BN_R_TOO_MANY_ITERATIONS);
361 goto err;
362 }
363 ERR_clear_error();
364 } else
365 goto err;
366 } else
367 break;
368 } while (1);
369
370 if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) {
371 if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod,
372 ctx, ret->m_ctx))
373 goto err;
374 } else {
375 if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx))
376 goto err;
377 }
378
379 return ret;
380
381err:
382 if (b == NULL && ret != NULL) {
383 BN_BLINDING_free(ret);
384 ret = NULL;
385 }
386
387 return ret;
388}
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