1 /* crypto/rsa/rsa_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 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 { 90 #ifdef RSA_NULL 91 default_RSA_meth=RSA_null_method(); 92 #else 93 #if 0 /* was: #ifdef RSAref */ 94 default_RSA_meth=RSA_PKCS1_RSAref(); 95 #else 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; 184 ret->flags=ret->meth->flags; 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 } 282 283 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 } 439 440 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 } 484
