Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/rsa/rsa_lib.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include <openssl/crypto.h> |
| 61 | #include "cryptlib.h" |
| 62 | #include <openssl/lhash.h> |
| 63 | #include <openssl/bn.h> |
| 64 | #include <openssl/rsa.h> |
| 65 | #include <openssl/rand.h> |
| 66 | #ifndef OPENSSL_NO_ENGINE |
| 67 | #include <openssl/engine.h> |
| 68 | #endif |
| 69 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 70 | const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT; |
| 71 | |
| 72 | static const RSA_METHOD *default_RSA_meth=NULL; |
| 73 | |
| 74 | RSA *RSA_new(void) |
| 75 | { |
| 76 | RSA *r=RSA_new_method(NULL); |
| 77 | |
| 78 | return r; |
| 79 | } |
| 80 | |
| 81 | void RSA_set_default_method(const RSA_METHOD *meth) |
| 82 | { |
| 83 | default_RSA_meth = meth; |
| 84 | } |
| 85 | |
| 86 | const RSA_METHOD *RSA_get_default_method(void) |
| 87 | { |
| 88 | if (default_RSA_meth == NULL) |
| 89 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 90 | #ifdef RSA_NULL |
| 91 | default_RSA_meth=RSA_null_method(); |
| 92 | #else |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 93 | #if 0 /* was: #ifdef RSAref */ |
| 94 | default_RSA_meth=RSA_PKCS1_RSAref(); |
| 95 | #else |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 96 | default_RSA_meth=RSA_PKCS1_SSLeay(); |
| 97 | #endif |
| 98 | #endif |
| 99 | } |
| 100 | |
| 101 | return default_RSA_meth; |
| 102 | } |
| 103 | |
| 104 | const RSA_METHOD *RSA_get_method(const RSA *rsa) |
| 105 | { |
| 106 | return rsa->meth; |
| 107 | } |
| 108 | |
| 109 | int RSA_set_method(RSA *rsa, const RSA_METHOD *meth) |
| 110 | { |
| 111 | /* NB: The caller is specifically setting a method, so it's not up to us |
| 112 | * to deal with which ENGINE it comes from. */ |
| 113 | const RSA_METHOD *mtmp; |
| 114 | mtmp = rsa->meth; |
| 115 | if (mtmp->finish) mtmp->finish(rsa); |
| 116 | #ifndef OPENSSL_NO_ENGINE |
| 117 | if (rsa->engine) |
| 118 | { |
| 119 | ENGINE_finish(rsa->engine); |
| 120 | rsa->engine = NULL; |
| 121 | } |
| 122 | #endif |
| 123 | rsa->meth = meth; |
| 124 | if (meth->init) meth->init(rsa); |
| 125 | return 1; |
| 126 | } |
| 127 | |
| 128 | RSA *RSA_new_method(ENGINE *engine) |
| 129 | { |
| 130 | RSA *ret; |
| 131 | |
| 132 | ret=(RSA *)OPENSSL_malloc(sizeof(RSA)); |
| 133 | if (ret == NULL) |
| 134 | { |
| 135 | RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); |
| 136 | return NULL; |
| 137 | } |
| 138 | |
| 139 | ret->meth = RSA_get_default_method(); |
| 140 | #ifndef OPENSSL_NO_ENGINE |
| 141 | if (engine) |
| 142 | { |
| 143 | if (!ENGINE_init(engine)) |
| 144 | { |
| 145 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); |
| 146 | OPENSSL_free(ret); |
| 147 | return NULL; |
| 148 | } |
| 149 | ret->engine = engine; |
| 150 | } |
| 151 | else |
| 152 | ret->engine = ENGINE_get_default_RSA(); |
| 153 | if(ret->engine) |
| 154 | { |
| 155 | ret->meth = ENGINE_get_RSA(ret->engine); |
| 156 | if(!ret->meth) |
| 157 | { |
| 158 | RSAerr(RSA_F_RSA_NEW_METHOD, |
| 159 | ERR_R_ENGINE_LIB); |
| 160 | ENGINE_finish(ret->engine); |
| 161 | OPENSSL_free(ret); |
| 162 | return NULL; |
| 163 | } |
| 164 | } |
| 165 | #endif |
| 166 | |
| 167 | ret->pad=0; |
| 168 | ret->version=0; |
| 169 | ret->n=NULL; |
| 170 | ret->e=NULL; |
| 171 | ret->d=NULL; |
| 172 | ret->p=NULL; |
| 173 | ret->q=NULL; |
| 174 | ret->dmp1=NULL; |
| 175 | ret->dmq1=NULL; |
| 176 | ret->iqmp=NULL; |
| 177 | ret->references=1; |
| 178 | ret->_method_mod_n=NULL; |
| 179 | ret->_method_mod_p=NULL; |
| 180 | ret->_method_mod_q=NULL; |
| 181 | ret->blinding=NULL; |
| 182 | ret->mt_blinding=NULL; |
| 183 | ret->bignum_data=NULL; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 184 | ret->flags=ret->meth->flags; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 185 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) |
| 186 | { |
| 187 | #ifndef OPENSSL_NO_ENGINE |
| 188 | if (ret->engine) |
| 189 | ENGINE_finish(ret->engine); |
| 190 | #endif |
| 191 | OPENSSL_free(ret); |
| 192 | return(NULL); |
| 193 | } |
| 194 | |
| 195 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) |
| 196 | { |
| 197 | #ifndef OPENSSL_NO_ENGINE |
| 198 | if (ret->engine) |
| 199 | ENGINE_finish(ret->engine); |
| 200 | #endif |
| 201 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); |
| 202 | OPENSSL_free(ret); |
| 203 | ret=NULL; |
| 204 | } |
| 205 | return(ret); |
| 206 | } |
| 207 | |
| 208 | void RSA_free(RSA *r) |
| 209 | { |
| 210 | int i; |
| 211 | |
| 212 | if (r == NULL) return; |
| 213 | |
| 214 | i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); |
| 215 | #ifdef REF_PRINT |
| 216 | REF_PRINT("RSA",r); |
| 217 | #endif |
| 218 | if (i > 0) return; |
| 219 | #ifdef REF_CHECK |
| 220 | if (i < 0) |
| 221 | { |
| 222 | fprintf(stderr,"RSA_free, bad reference count\n"); |
| 223 | abort(); |
| 224 | } |
| 225 | #endif |
| 226 | |
| 227 | if (r->meth->finish) |
| 228 | r->meth->finish(r); |
| 229 | #ifndef OPENSSL_NO_ENGINE |
| 230 | if (r->engine) |
| 231 | ENGINE_finish(r->engine); |
| 232 | #endif |
| 233 | |
| 234 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); |
| 235 | |
| 236 | if (r->n != NULL) BN_clear_free(r->n); |
| 237 | if (r->e != NULL) BN_clear_free(r->e); |
| 238 | if (r->d != NULL) BN_clear_free(r->d); |
| 239 | if (r->p != NULL) BN_clear_free(r->p); |
| 240 | if (r->q != NULL) BN_clear_free(r->q); |
| 241 | if (r->dmp1 != NULL) BN_clear_free(r->dmp1); |
| 242 | if (r->dmq1 != NULL) BN_clear_free(r->dmq1); |
| 243 | if (r->iqmp != NULL) BN_clear_free(r->iqmp); |
| 244 | if (r->blinding != NULL) BN_BLINDING_free(r->blinding); |
| 245 | if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding); |
| 246 | if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); |
| 247 | OPENSSL_free(r); |
| 248 | } |
| 249 | |
| 250 | int RSA_up_ref(RSA *r) |
| 251 | { |
| 252 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); |
| 253 | #ifdef REF_PRINT |
| 254 | REF_PRINT("RSA",r); |
| 255 | #endif |
| 256 | #ifdef REF_CHECK |
| 257 | if (i < 2) |
| 258 | { |
| 259 | fprintf(stderr, "RSA_up_ref, bad reference count\n"); |
| 260 | abort(); |
| 261 | } |
| 262 | #endif |
| 263 | return ((i > 1) ? 1 : 0); |
| 264 | } |
| 265 | |
| 266 | int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
| 267 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) |
| 268 | { |
| 269 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, |
| 270 | new_func, dup_func, free_func); |
| 271 | } |
| 272 | |
| 273 | int RSA_set_ex_data(RSA *r, int idx, void *arg) |
| 274 | { |
| 275 | return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); |
| 276 | } |
| 277 | |
| 278 | void *RSA_get_ex_data(const RSA *r, int idx) |
| 279 | { |
| 280 | return(CRYPTO_get_ex_data(&r->ex_data,idx)); |
| 281 | } |
| 282 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 283 | int RSA_size(const RSA *r) |
| 284 | { |
| 285 | return(BN_num_bytes(r->n)); |
| 286 | } |
| 287 | |
| 288 | int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, |
| 289 | RSA *rsa, int padding) |
| 290 | { |
| 291 | return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); |
| 292 | } |
| 293 | |
| 294 | int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, |
| 295 | RSA *rsa, int padding) |
| 296 | { |
| 297 | return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); |
| 298 | } |
| 299 | |
| 300 | int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, |
| 301 | RSA *rsa, int padding) |
| 302 | { |
| 303 | return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); |
| 304 | } |
| 305 | |
| 306 | int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, |
| 307 | RSA *rsa, int padding) |
| 308 | { |
| 309 | return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); |
| 310 | } |
| 311 | |
| 312 | int RSA_flags(const RSA *r) |
| 313 | { |
| 314 | return((r == NULL)?0:r->meth->flags); |
| 315 | } |
| 316 | |
| 317 | void RSA_blinding_off(RSA *rsa) |
| 318 | { |
| 319 | if (rsa->blinding != NULL) |
| 320 | { |
| 321 | BN_BLINDING_free(rsa->blinding); |
| 322 | rsa->blinding=NULL; |
| 323 | } |
| 324 | rsa->flags &= ~RSA_FLAG_BLINDING; |
| 325 | rsa->flags |= RSA_FLAG_NO_BLINDING; |
| 326 | } |
| 327 | |
| 328 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) |
| 329 | { |
| 330 | int ret=0; |
| 331 | |
| 332 | if (rsa->blinding != NULL) |
| 333 | RSA_blinding_off(rsa); |
| 334 | |
| 335 | rsa->blinding = RSA_setup_blinding(rsa, ctx); |
| 336 | if (rsa->blinding == NULL) |
| 337 | goto err; |
| 338 | |
| 339 | rsa->flags |= RSA_FLAG_BLINDING; |
| 340 | rsa->flags &= ~RSA_FLAG_NO_BLINDING; |
| 341 | ret=1; |
| 342 | err: |
| 343 | return(ret); |
| 344 | } |
| 345 | |
| 346 | static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, |
| 347 | const BIGNUM *q, BN_CTX *ctx) |
| 348 | { |
| 349 | BIGNUM *ret = NULL, *r0, *r1, *r2; |
| 350 | |
| 351 | if (d == NULL || p == NULL || q == NULL) |
| 352 | return NULL; |
| 353 | |
| 354 | BN_CTX_start(ctx); |
| 355 | r0 = BN_CTX_get(ctx); |
| 356 | r1 = BN_CTX_get(ctx); |
| 357 | r2 = BN_CTX_get(ctx); |
| 358 | if (r2 == NULL) |
| 359 | goto err; |
| 360 | |
| 361 | if (!BN_sub(r1, p, BN_value_one())) goto err; |
| 362 | if (!BN_sub(r2, q, BN_value_one())) goto err; |
| 363 | if (!BN_mul(r0, r1, r2, ctx)) goto err; |
| 364 | |
| 365 | ret = BN_mod_inverse(NULL, d, r0, ctx); |
| 366 | err: |
| 367 | BN_CTX_end(ctx); |
| 368 | return ret; |
| 369 | } |
| 370 | |
| 371 | BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) |
| 372 | { |
| 373 | BIGNUM local_n; |
| 374 | BIGNUM *e,*n; |
| 375 | BN_CTX *ctx; |
| 376 | BN_BLINDING *ret = NULL; |
| 377 | |
| 378 | if (in_ctx == NULL) |
| 379 | { |
| 380 | if ((ctx = BN_CTX_new()) == NULL) return 0; |
| 381 | } |
| 382 | else |
| 383 | ctx = in_ctx; |
| 384 | |
| 385 | BN_CTX_start(ctx); |
| 386 | e = BN_CTX_get(ctx); |
| 387 | if (e == NULL) |
| 388 | { |
| 389 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); |
| 390 | goto err; |
| 391 | } |
| 392 | |
| 393 | if (rsa->e == NULL) |
| 394 | { |
| 395 | e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); |
| 396 | if (e == NULL) |
| 397 | { |
| 398 | RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); |
| 399 | goto err; |
| 400 | } |
| 401 | } |
| 402 | else |
| 403 | e = rsa->e; |
| 404 | |
| 405 | |
| 406 | if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) |
| 407 | { |
| 408 | /* if PRNG is not properly seeded, resort to secret |
| 409 | * exponent as unpredictable seed */ |
| 410 | RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0); |
| 411 | } |
| 412 | |
| 413 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) |
| 414 | { |
| 415 | /* Set BN_FLG_CONSTTIME flag */ |
| 416 | n = &local_n; |
| 417 | BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); |
| 418 | } |
| 419 | else |
| 420 | n = rsa->n; |
| 421 | |
| 422 | ret = BN_BLINDING_create_param(NULL, e, n, ctx, |
| 423 | rsa->meth->bn_mod_exp, rsa->_method_mod_n); |
| 424 | if (ret == NULL) |
| 425 | { |
| 426 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); |
| 427 | goto err; |
| 428 | } |
| 429 | CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret)); |
| 430 | err: |
| 431 | BN_CTX_end(ctx); |
| 432 | if (in_ctx == NULL) |
| 433 | BN_CTX_free(ctx); |
| 434 | if(rsa->e == NULL) |
| 435 | BN_free(e); |
| 436 | |
| 437 | return ret; |
| 438 | } |
| 439 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 440 | int RSA_memory_lock(RSA *r) |
| 441 | { |
| 442 | int i,j,k,off; |
| 443 | char *p; |
| 444 | BIGNUM *bn,**t[6],*b; |
| 445 | BN_ULONG *ul; |
| 446 | |
| 447 | if (r->d == NULL) return(1); |
| 448 | t[0]= &r->d; |
| 449 | t[1]= &r->p; |
| 450 | t[2]= &r->q; |
| 451 | t[3]= &r->dmp1; |
| 452 | t[4]= &r->dmq1; |
| 453 | t[5]= &r->iqmp; |
| 454 | k=sizeof(BIGNUM)*6; |
| 455 | off=k/sizeof(BN_ULONG)+1; |
| 456 | j=1; |
| 457 | for (i=0; i<6; i++) |
| 458 | j+= (*t[i])->top; |
| 459 | if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) |
| 460 | { |
| 461 | RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); |
| 462 | return(0); |
| 463 | } |
| 464 | bn=(BIGNUM *)p; |
| 465 | ul=(BN_ULONG *)&(p[off]); |
| 466 | for (i=0; i<6; i++) |
| 467 | { |
| 468 | b= *(t[i]); |
| 469 | *(t[i])= &(bn[i]); |
| 470 | memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); |
| 471 | bn[i].flags=BN_FLG_STATIC_DATA; |
| 472 | bn[i].d=ul; |
| 473 | memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); |
| 474 | ul+=b->top; |
| 475 | BN_clear_free(b); |
| 476 | } |
| 477 | |
| 478 | /* I should fix this so it can still be done */ |
| 479 | r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); |
| 480 | |
| 481 | r->bignum_data=p; |
| 482 | return(1); |
| 483 | } |