Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/bn/bn_blind.c */ |
| 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 | #include "cryptlib.h" |
| 114 | #include "bn_lcl.h" |
| 115 | |
| 116 | #define BN_BLINDING_COUNTER 32 |
| 117 | |
| 118 | struct bn_blinding_st |
| 119 | { |
| 120 | BIGNUM *A; |
| 121 | BIGNUM *Ai; |
| 122 | BIGNUM *e; |
| 123 | BIGNUM *mod; /* just a reference */ |
| 124 | #ifndef OPENSSL_NO_DEPRECATED |
| 125 | unsigned long thread_id; /* added in OpenSSL 0.9.6j and 0.9.7b; |
| 126 | * used only by crypto/rsa/rsa_eay.c, rsa_lib.c */ |
| 127 | #endif |
| 128 | CRYPTO_THREADID tid; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 129 | unsigned int counter; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 130 | unsigned long flags; |
| 131 | BN_MONT_CTX *m_ctx; |
| 132 | int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, |
| 133 | const BIGNUM *m, BN_CTX *ctx, |
| 134 | BN_MONT_CTX *m_ctx); |
| 135 | }; |
| 136 | |
| 137 | BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod) |
| 138 | { |
| 139 | BN_BLINDING *ret=NULL; |
| 140 | |
| 141 | bn_check_top(mod); |
| 142 | |
| 143 | if ((ret=(BN_BLINDING *)OPENSSL_malloc(sizeof(BN_BLINDING))) == NULL) |
| 144 | { |
| 145 | BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE); |
| 146 | return(NULL); |
| 147 | } |
| 148 | memset(ret,0,sizeof(BN_BLINDING)); |
| 149 | if (A != NULL) |
| 150 | { |
| 151 | if ((ret->A = BN_dup(A)) == NULL) goto err; |
| 152 | } |
| 153 | if (Ai != NULL) |
| 154 | { |
| 155 | if ((ret->Ai = BN_dup(Ai)) == NULL) goto err; |
| 156 | } |
| 157 | |
| 158 | /* save a copy of mod in the BN_BLINDING structure */ |
| 159 | if ((ret->mod = BN_dup(mod)) == NULL) goto err; |
| 160 | if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) |
| 161 | BN_set_flags(ret->mod, BN_FLG_CONSTTIME); |
| 162 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 163 | ret->counter = BN_BLINDING_COUNTER; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 164 | CRYPTO_THREADID_current(&ret->tid); |
| 165 | return(ret); |
| 166 | err: |
| 167 | if (ret != NULL) BN_BLINDING_free(ret); |
| 168 | return(NULL); |
| 169 | } |
| 170 | |
| 171 | void BN_BLINDING_free(BN_BLINDING *r) |
| 172 | { |
| 173 | if(r == NULL) |
| 174 | return; |
| 175 | |
| 176 | if (r->A != NULL) BN_free(r->A ); |
| 177 | if (r->Ai != NULL) BN_free(r->Ai); |
| 178 | if (r->e != NULL) BN_free(r->e ); |
| 179 | if (r->mod != NULL) BN_free(r->mod); |
| 180 | OPENSSL_free(r); |
| 181 | } |
| 182 | |
| 183 | int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) |
| 184 | { |
| 185 | int ret=0; |
| 186 | |
| 187 | if ((b->A == NULL) || (b->Ai == NULL)) |
| 188 | { |
| 189 | BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED); |
| 190 | goto err; |
| 191 | } |
| 192 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 193 | if (--(b->counter) == 0 && b->e != NULL && |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 194 | !(b->flags & BN_BLINDING_NO_RECREATE)) |
| 195 | { |
| 196 | /* re-create blinding parameters */ |
| 197 | if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL)) |
| 198 | goto err; |
| 199 | } |
| 200 | else if (!(b->flags & BN_BLINDING_NO_UPDATE)) |
| 201 | { |
| 202 | if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err; |
| 203 | if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err; |
| 204 | } |
| 205 | |
| 206 | ret=1; |
| 207 | err: |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 208 | if (b->counter == 0) |
| 209 | b->counter = BN_BLINDING_COUNTER; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 210 | return(ret); |
| 211 | } |
| 212 | |
| 213 | int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) |
| 214 | { |
| 215 | return BN_BLINDING_convert_ex(n, NULL, b, ctx); |
| 216 | } |
| 217 | |
| 218 | int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx) |
| 219 | { |
| 220 | int ret = 1; |
| 221 | |
| 222 | bn_check_top(n); |
| 223 | |
| 224 | if ((b->A == NULL) || (b->Ai == NULL)) |
| 225 | { |
| 226 | BNerr(BN_F_BN_BLINDING_CONVERT_EX,BN_R_NOT_INITIALIZED); |
| 227 | return(0); |
| 228 | } |
| 229 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 230 | if (r != NULL) |
| 231 | { |
| 232 | if (!BN_copy(r, b->Ai)) ret=0; |
| 233 | } |
| 234 | |
| 235 | if (!BN_mod_mul(n,n,b->A,b->mod,ctx)) ret=0; |
| 236 | |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) |
| 241 | { |
| 242 | return BN_BLINDING_invert_ex(n, NULL, b, ctx); |
| 243 | } |
| 244 | |
| 245 | int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx) |
| 246 | { |
| 247 | int ret; |
| 248 | |
| 249 | bn_check_top(n); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 250 | if ((b->A == NULL) || (b->Ai == NULL)) |
| 251 | { |
| 252 | BNerr(BN_F_BN_BLINDING_INVERT_EX,BN_R_NOT_INITIALIZED); |
| 253 | return(0); |
| 254 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 255 | |
| 256 | if (r != NULL) |
| 257 | ret = BN_mod_mul(n, n, r, b->mod, ctx); |
| 258 | else |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 259 | ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 260 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 261 | if (ret >= 0) |
| 262 | { |
| 263 | if (!BN_BLINDING_update(b,ctx)) |
| 264 | return(0); |
| 265 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 266 | bn_check_top(n); |
| 267 | return(ret); |
| 268 | } |
| 269 | |
| 270 | #ifndef OPENSSL_NO_DEPRECATED |
| 271 | unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *b) |
| 272 | { |
| 273 | return b->thread_id; |
| 274 | } |
| 275 | |
| 276 | void BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n) |
| 277 | { |
| 278 | b->thread_id = n; |
| 279 | } |
| 280 | #endif |
| 281 | |
| 282 | CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *b) |
| 283 | { |
| 284 | return &b->tid; |
| 285 | } |
| 286 | |
| 287 | unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b) |
| 288 | { |
| 289 | return b->flags; |
| 290 | } |
| 291 | |
| 292 | void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags) |
| 293 | { |
| 294 | b->flags = flags; |
| 295 | } |
| 296 | |
| 297 | BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b, |
| 298 | const BIGNUM *e, BIGNUM *m, BN_CTX *ctx, |
| 299 | int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, |
| 300 | const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), |
| 301 | BN_MONT_CTX *m_ctx) |
| 302 | { |
| 303 | int retry_counter = 32; |
| 304 | BN_BLINDING *ret = NULL; |
| 305 | |
| 306 | if (b == NULL) |
| 307 | ret = BN_BLINDING_new(NULL, NULL, m); |
| 308 | else |
| 309 | ret = b; |
| 310 | |
| 311 | if (ret == NULL) |
| 312 | goto err; |
| 313 | |
| 314 | if (ret->A == NULL && (ret->A = BN_new()) == NULL) |
| 315 | goto err; |
| 316 | if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) |
| 317 | goto err; |
| 318 | |
| 319 | if (e != NULL) |
| 320 | { |
| 321 | if (ret->e != NULL) |
| 322 | BN_free(ret->e); |
| 323 | ret->e = BN_dup(e); |
| 324 | } |
| 325 | if (ret->e == NULL) |
| 326 | goto err; |
| 327 | |
| 328 | if (bn_mod_exp != NULL) |
| 329 | ret->bn_mod_exp = bn_mod_exp; |
| 330 | if (m_ctx != NULL) |
| 331 | ret->m_ctx = m_ctx; |
| 332 | |
| 333 | do { |
| 334 | if (!BN_rand_range(ret->A, ret->mod)) goto err; |
| 335 | if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL) |
| 336 | { |
| 337 | /* this should almost never happen for good RSA keys */ |
| 338 | unsigned long error = ERR_peek_last_error(); |
| 339 | if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) |
| 340 | { |
| 341 | if (retry_counter-- == 0) |
| 342 | { |
| 343 | BNerr(BN_F_BN_BLINDING_CREATE_PARAM, |
| 344 | BN_R_TOO_MANY_ITERATIONS); |
| 345 | goto err; |
| 346 | } |
| 347 | ERR_clear_error(); |
| 348 | } |
| 349 | else |
| 350 | goto err; |
| 351 | } |
| 352 | else |
| 353 | break; |
| 354 | } while (1); |
| 355 | |
| 356 | if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) |
| 357 | { |
| 358 | if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx)) |
| 359 | goto err; |
| 360 | } |
| 361 | else |
| 362 | { |
| 363 | if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) |
| 364 | goto err; |
| 365 | } |
| 366 | |
| 367 | return ret; |
| 368 | err: |
| 369 | if (b == NULL && ret != NULL) |
| 370 | { |
| 371 | BN_BLINDING_free(ret); |
| 372 | ret = NULL; |
| 373 | } |
| 374 | |
| 375 | return ret; |
| 376 | } |