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 /* $FreeBSD$ */ 59 60 #include <stdio.h> 61 #include <openssl/crypto.h> 62 #include "cryptlib.h" 63 #include <openssl/lhash.h> 64 #include <openssl/bn.h> 65 #include <openssl/rsa.h> 66 #include <openssl/rand.h> 67 #ifndef OPENSSL_NO_ENGINE 68 #include <openssl/engine.h> 69 #endif 70 71 const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT; 72 73 static const RSA_METHOD *default_RSA_meth=NULL; 74 75 RSA *RSA_new(void) 76 { 77 RSA *r=RSA_new_method(NULL); 78 79 #ifndef OPENSSL_NO_FORCE_RSA_BLINDING 80 r->flags|=RSA_FLAG_BLINDING; 81 #endif 82 return r; 83 } 84 85 void RSA_set_default_method(const RSA_METHOD *meth) 86 { 87 default_RSA_meth = meth; 88 } 89 90 const RSA_METHOD *RSA_get_default_method(void) 91 { 92 if (default_RSA_meth == NULL) 93 { 94 #ifdef RSA_NULL 95 default_RSA_meth=RSA_null_method(); 96 #else 97 #if 0 /* was: #ifdef RSAref */ 98 default_RSA_meth=RSA_PKCS1_RSAref(); 99 #else 100 default_RSA_meth=RSA_PKCS1_SSLeay(); 101 #endif 102 #endif 103 } 104 105 return default_RSA_meth; 106 } 107 108 const RSA_METHOD *RSA_get_method(const RSA *rsa) 109 { 110 return rsa->meth; 111 } 112 113 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth) 114 { 115 /* NB: The caller is specifically setting a method, so it's not up to us 116 * to deal with which ENGINE it comes from. */ 117 const RSA_METHOD *mtmp; 118 mtmp = rsa->meth; 119 if (mtmp->finish) mtmp->finish(rsa); 120 #ifndef OPENSSL_NO_ENGINE 121 if (rsa->engine) 122 { 123 ENGINE_finish(rsa->engine); 124 rsa->engine = NULL; 125 } 126 #endif 127 rsa->meth = meth; 128 if (meth->init) meth->init(rsa); 129 return 1; 130 } 131 132 RSA *RSA_new_method(ENGINE *engine) 133 { 134 RSA *ret; 135 136 ret=(RSA *)OPENSSL_malloc(sizeof(RSA)); 137 if (ret == NULL) 138 { 139 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 140 return NULL; 141 } 142 143 ret->meth = RSA_get_default_method(); 144 #ifndef OPENSSL_NO_ENGINE 145 if (engine) 146 { 147 if (!ENGINE_init(engine)) 148 { 149 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); 150 OPENSSL_free(ret); 151 return NULL; 152 } 153 ret->engine = engine; 154 } 155 else 156 ret->engine = ENGINE_get_default_RSA(); 157 if(ret->engine) 158 { 159 ret->meth = ENGINE_get_RSA(ret->engine); 160 if(!ret->meth) 161 { 162 RSAerr(RSA_F_RSA_NEW_METHOD, 163 ERR_R_ENGINE_LIB); 164 ENGINE_finish(ret->engine); 165 OPENSSL_free(ret); 166 return NULL; 167 } 168 } 169 #endif 170 171 ret->pad=0; 172 ret->version=0; 173 ret->n=NULL; 174 ret->e=NULL; 175 ret->d=NULL; 176 ret->p=NULL; 177 ret->q=NULL; 178 ret->dmp1=NULL; 179 ret->dmq1=NULL; 180 ret->iqmp=NULL; 181 ret->references=1; 182 ret->_method_mod_n=NULL; 183 ret->_method_mod_p=NULL; 184 ret->_method_mod_q=NULL; 185 ret->blinding=NULL; 186 ret->bignum_data=NULL; 187 ret->flags=ret->meth->flags; 188 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 189 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 190 { 191 #ifndef OPENSSL_NO_ENGINE 192 if (ret->engine) 193 ENGINE_finish(ret->engine); 194 #endif 195 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 196 OPENSSL_free(ret); 197 ret=NULL; 198 } 199 return(ret); 200 } 201 202 void RSA_free(RSA *r) 203 { 204 int i; 205 206 if (r == NULL) return; 207 208 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 209 #ifdef REF_PRINT 210 REF_PRINT("RSA",r); 211 #endif 212 if (i > 0) return; 213 #ifdef REF_CHECK 214 if (i < 0) 215 { 216 fprintf(stderr,"RSA_free, bad reference count\n"); 217 abort(); 218 } 219 #endif 220 221 if (r->meth->finish) 222 r->meth->finish(r); 223 #ifndef OPENSSL_NO_ENGINE 224 if (r->engine) 225 ENGINE_finish(r->engine); 226 #endif 227 228 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 229 230 if (r->n != NULL) BN_clear_free(r->n); 231 if (r->e != NULL) BN_clear_free(r->e); 232 if (r->d != NULL) BN_clear_free(r->d); 233 if (r->p != NULL) BN_clear_free(r->p); 234 if (r->q != NULL) BN_clear_free(r->q); 235 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 236 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 237 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 238 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 239 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); 240 OPENSSL_free(r); 241 } 242 243 int RSA_up_ref(RSA *r) 244 { 245 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 246 #ifdef REF_PRINT 247 REF_PRINT("RSA",r); 248 #endif 249 #ifdef REF_CHECK 250 if (i < 2) 251 { 252 fprintf(stderr, "RSA_up_ref, bad reference count\n"); 253 abort(); 254 } 255 #endif 256 return ((i > 1) ? 1 : 0); 257 } 258 259 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 260 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 261 { 262 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 263 new_func, dup_func, free_func); 264 } 265 266 int RSA_set_ex_data(RSA *r, int idx, void *arg) 267 { 268 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 269 } 270 271 void *RSA_get_ex_data(const RSA *r, int idx) 272 { 273 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 274 } 275 276 int RSA_size(const RSA *r) 277 { 278 return(BN_num_bytes(r->n)); 279 } 280 281 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 282 RSA *rsa, int padding) 283 { 284 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); 285 } 286 287 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 288 RSA *rsa, int padding) 289 { 290 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); 291 } 292 293 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 294 RSA *rsa, int padding) 295 { 296 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); 297 } 298 299 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 300 RSA *rsa, int padding) 301 { 302 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); 303 } 304 305 int RSA_flags(const RSA *r) 306 { 307 return((r == NULL)?0:r->meth->flags); 308 } 309 310 void RSA_blinding_off(RSA *rsa) 311 { 312 if (rsa->blinding != NULL) 313 { 314 BN_BLINDING_free(rsa->blinding); 315 rsa->blinding=NULL; 316 } 317 rsa->flags &= ~RSA_FLAG_BLINDING; 318 rsa->flags |= RSA_FLAG_NO_BLINDING; 319 } 320 321 int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx) 322 { 323 BIGNUM *A,*Ai = NULL; 324 BN_CTX *ctx; 325 int ret=0; 326 327 if (p_ctx == NULL) 328 { 329 if ((ctx=BN_CTX_new()) == NULL) goto err; 330 } 331 else 332 ctx=p_ctx; 333 334 /* XXXXX: Shouldn't this be RSA_blinding_off(rsa)? */ 335 if (rsa->blinding != NULL) 336 { 337 BN_BLINDING_free(rsa->blinding); 338 rsa->blinding = NULL; 339 } 340 341 /* NB: similar code appears in setup_blinding (rsa_eay.c); 342 * this should be placed in a new function of its own, but for reasons 343 * of binary compatibility can't */ 344 345 BN_CTX_start(ctx); 346 A = BN_CTX_get(ctx); 347 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) 348 { 349 /* if PRNG is not properly seeded, resort to secret exponent as unpredictable seed */ 350 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0); 351 if (!BN_pseudo_rand_range(A,rsa->n)) goto err; 352 } 353 else 354 { 355 if (!BN_rand_range(A,rsa->n)) goto err; 356 } 357 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err; 358 359 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) 360 goto err; 361 if ((rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n)) == NULL) goto err; 362 /* to make things thread-safe without excessive locking, 363 * rsa->blinding will be used just by the current thread: */ 364 rsa->blinding->thread_id = CRYPTO_thread_id(); 365 rsa->flags |= RSA_FLAG_BLINDING; 366 rsa->flags &= ~RSA_FLAG_NO_BLINDING; 367 ret=1; 368 err: 369 if (Ai != NULL) BN_free(Ai); 370 BN_CTX_end(ctx); 371 if (ctx != p_ctx) BN_CTX_free(ctx); 372 return(ret); 373 } 374 375 int RSA_memory_lock(RSA *r) 376 { 377 int i,j,k,off; 378 char *p; 379 BIGNUM *bn,**t[6],*b; 380 BN_ULONG *ul; 381 382 if (r->d == NULL) return(1); 383 t[0]= &r->d; 384 t[1]= &r->p; 385 t[2]= &r->q; 386 t[3]= &r->dmp1; 387 t[4]= &r->dmq1; 388 t[5]= &r->iqmp; 389 k=sizeof(BIGNUM)*6; 390 off=k/sizeof(BN_ULONG)+1; 391 j=1; 392 for (i=0; i<6; i++) 393 j+= (*t[i])->top; 394 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) 395 { 396 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 397 return(0); 398 } 399 bn=(BIGNUM *)p; 400 ul=(BN_ULONG *)&(p[off]); 401 for (i=0; i<6; i++) 402 { 403 b= *(t[i]); 404 *(t[i])= &(bn[i]); 405 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 406 bn[i].flags=BN_FLG_STATIC_DATA; 407 bn[i].d=ul; 408 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 409 ul+=b->top; 410 BN_clear_free(b); 411 } 412 413 /* I should fix this so it can still be done */ 414 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 415 416 r->bignum_data=p; 417 return(1); 418 } 419