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 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 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 186 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 187 { 188 #ifndef OPENSSL_NO_ENGINE 189 if (ret->engine) 190 ENGINE_finish(ret->engine); 191 #endif 192 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 193 OPENSSL_free(ret); 194 ret=NULL; 195 } 196 return(ret); 197 } 198 199 void RSA_free(RSA *r) 200 { 201 int i; 202 203 if (r == NULL) return; 204 205 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 206 #ifdef REF_PRINT 207 REF_PRINT("RSA",r); 208 #endif 209 if (i > 0) return; 210 #ifdef REF_CHECK 211 if (i < 0) 212 { 213 fprintf(stderr,"RSA_free, bad reference count\n"); 214 abort(); 215 } 216 #endif 217 218 if (r->meth->finish) 219 r->meth->finish(r); 220 #ifndef OPENSSL_NO_ENGINE 221 if (r->engine) 222 ENGINE_finish(r->engine); 223 #endif 224 225 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 226 227 if (r->n != NULL) BN_clear_free(r->n); 228 if (r->e != NULL) BN_clear_free(r->e); 229 if (r->d != NULL) BN_clear_free(r->d); 230 if (r->p != NULL) BN_clear_free(r->p); 231 if (r->q != NULL) BN_clear_free(r->q); 232 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 233 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 234 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 235 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 236 if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding); 237 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); 238 OPENSSL_free(r); 239 } 240 241 int RSA_up_ref(RSA *r) 242 { 243 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 244 #ifdef REF_PRINT 245 REF_PRINT("RSA",r); 246 #endif 247 #ifdef REF_CHECK 248 if (i < 2) 249 { 250 fprintf(stderr, "RSA_up_ref, bad reference count\n"); 251 abort(); 252 } 253 #endif 254 return ((i > 1) ? 1 : 0); 255 } 256 257 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 258 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 259 { 260 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 261 new_func, dup_func, free_func); 262 } 263 264 int RSA_set_ex_data(RSA *r, int idx, void *arg) 265 { 266 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 267 } 268 269 void *RSA_get_ex_data(const RSA *r, int idx) 270 { 271 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 272 } 273 274 int RSA_size(const RSA *r) 275 { 276 return(BN_num_bytes(r->n)); 277 } 278 279 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 280 RSA *rsa, int padding) 281 { 282 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); 283 } 284 285 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 286 RSA *rsa, int padding) 287 { 288 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); 289 } 290 291 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 292 RSA *rsa, int padding) 293 { 294 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); 295 } 296 297 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 298 RSA *rsa, int padding) 299 { 300 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); 301 } 302 303 int RSA_flags(const RSA *r) 304 { 305 return((r == NULL)?0:r->meth->flags); 306 } 307 308 void RSA_blinding_off(RSA *rsa) 309 { 310 if (rsa->blinding != NULL) 311 { 312 BN_BLINDING_free(rsa->blinding); 313 rsa->blinding=NULL; 314 } 315 rsa->flags &= ~RSA_FLAG_BLINDING; 316 rsa->flags |= RSA_FLAG_NO_BLINDING; 317 } 318 319 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) 320 { 321 int ret=0; 322 323 if (rsa->blinding != NULL) 324 RSA_blinding_off(rsa); 325 326 rsa->blinding = RSA_setup_blinding(rsa, ctx); 327 if (rsa->blinding == NULL) 328 goto err; 329 330 rsa->flags |= RSA_FLAG_BLINDING; 331 rsa->flags &= ~RSA_FLAG_NO_BLINDING; 332 ret=1; 333 err: 334 return(ret); 335 } 336 337 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, 338 const BIGNUM *q, BN_CTX *ctx) 339 { 340 BIGNUM *ret = NULL, *r0, *r1, *r2; 341 342 if (d == NULL || p == NULL || q == NULL) 343 return NULL; 344 345 BN_CTX_start(ctx); 346 r0 = BN_CTX_get(ctx); 347 r1 = BN_CTX_get(ctx); 348 r2 = BN_CTX_get(ctx); 349 if (r2 == NULL) 350 goto err; 351 352 if (!BN_sub(r1, p, BN_value_one())) goto err; 353 if (!BN_sub(r2, q, BN_value_one())) goto err; 354 if (!BN_mul(r0, r1, r2, ctx)) goto err; 355 356 ret = BN_mod_inverse(NULL, d, r0, ctx); 357 err: 358 BN_CTX_end(ctx); 359 return ret; 360 } 361 362 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) 363 { 364 BIGNUM local_n; 365 BIGNUM *e,*n; 366 BN_CTX *ctx; 367 BN_BLINDING *ret = NULL; 368 369 if (in_ctx == NULL) 370 { 371 if ((ctx = BN_CTX_new()) == NULL) return 0; 372 } 373 else 374 ctx = in_ctx; 375 376 BN_CTX_start(ctx); 377 e = BN_CTX_get(ctx); 378 if (e == NULL) 379 { 380 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); 381 goto err; 382 } 383 384 if (rsa->e == NULL) 385 { 386 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); 387 if (e == NULL) 388 { 389 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); 390 goto err; 391 } 392 } 393 else 394 e = rsa->e; 395 396 397 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) 398 { 399 /* if PRNG is not properly seeded, resort to secret 400 * exponent as unpredictable seed */ 401 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0); 402 } 403 404 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) 405 { 406 /* Set BN_FLG_CONSTTIME flag */ 407 n = &local_n; 408 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); 409 } 410 else 411 n = rsa->n; 412 413 ret = BN_BLINDING_create_param(NULL, e, n, ctx, 414 rsa->meth->bn_mod_exp, rsa->_method_mod_n); 415 if (ret == NULL) 416 { 417 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); 418 goto err; 419 } 420 BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id()); 421 err: 422 BN_CTX_end(ctx); 423 if (in_ctx == NULL) 424 BN_CTX_free(ctx); 425 if(rsa->e == NULL) 426 BN_free(e); 427 428 return ret; 429 } 430 431 int RSA_memory_lock(RSA *r) 432 { 433 int i,j,k,off; 434 char *p; 435 BIGNUM *bn,**t[6],*b; 436 BN_ULONG *ul; 437 438 if (r->d == NULL) return(1); 439 t[0]= &r->d; 440 t[1]= &r->p; 441 t[2]= &r->q; 442 t[3]= &r->dmp1; 443 t[4]= &r->dmq1; 444 t[5]= &r->iqmp; 445 k=sizeof(BIGNUM)*6; 446 off=k/sizeof(BN_ULONG)+1; 447 j=1; 448 for (i=0; i<6; i++) 449 j+= (*t[i])->top; 450 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) 451 { 452 RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 453 return(0); 454 } 455 bn=(BIGNUM *)p; 456 ul=(BN_ULONG *)&(p[off]); 457 for (i=0; i<6; i++) 458 { 459 b= *(t[i]); 460 *(t[i])= &(bn[i]); 461 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 462 bn[i].flags=BN_FLG_STATIC_DATA; 463 bn[i].d=ul; 464 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 465 ul+=b->top; 466 BN_clear_free(b); 467 } 468 469 /* I should fix this so it can still be done */ 470 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 471 472 r->bignum_data=p; 473 return(1); 474 } 475