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->bignum_data=NULL; 183 ret->flags=ret->meth->flags; 184 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 185 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 186 { 187 #ifndef OPENSSL_NO_ENGINE 188 if (ret->engine) 189 ENGINE_finish(ret->engine); 190 #endif 191 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 192 OPENSSL_free(ret); 193 ret=NULL; 194 } 195 return(ret); 196 } 197 198 void RSA_free(RSA *r) 199 { 200 int i; 201 202 if (r == NULL) return; 203 204 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 205 #ifdef REF_PRINT 206 REF_PRINT("RSA",r); 207 #endif 208 if (i > 0) return; 209 #ifdef REF_CHECK 210 if (i < 0) 211 { 212 fprintf(stderr,"RSA_free, bad reference count\n"); 213 abort(); 214 } 215 #endif 216 217 if (r->meth->finish) 218 r->meth->finish(r); 219 #ifndef OPENSSL_NO_ENGINE 220 if (r->engine) 221 ENGINE_finish(r->engine); 222 #endif 223 224 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 225 226 if (r->n != NULL) BN_clear_free(r->n); 227 if (r->e != NULL) BN_clear_free(r->e); 228 if (r->d != NULL) BN_clear_free(r->d); 229 if (r->p != NULL) BN_clear_free(r->p); 230 if (r->q != NULL) BN_clear_free(r->q); 231 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 232 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 233 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 234 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 235 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); 236 OPENSSL_free(r); 237 } 238 239 int RSA_up_ref(RSA *r) 240 { 241 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 242 #ifdef REF_PRINT 243 REF_PRINT("RSA",r); 244 #endif 245 #ifdef REF_CHECK 246 if (i < 2) 247 { 248 fprintf(stderr, "RSA_up_ref, bad reference count\n"); 249 abort(); 250 } 251 #endif 252 return ((i > 1) ? 1 : 0); 253 } 254 255 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 256 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 257 { 258 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 259 new_func, dup_func, free_func); 260 } 261 262 int RSA_set_ex_data(RSA *r, int idx, void *arg) 263 { 264 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 265 } 266 267 void *RSA_get_ex_data(const RSA *r, int idx) 268 { 269 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 270 } 271 272 int RSA_size(const RSA *r) 273 { 274 return(BN_num_bytes(r->n)); 275 } 276 277 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 278 RSA *rsa, int padding) 279 { 280 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); 281 } 282 283 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 284 RSA *rsa, int padding) 285 { 286 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); 287 } 288 289 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 290 RSA *rsa, int padding) 291 { 292 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); 293 } 294 295 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 296 RSA *rsa, int padding) 297 { 298 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); 299 } 300 301 int RSA_flags(const RSA *r) 302 { 303 return((r == NULL)?0:r->meth->flags); 304 } 305 306 void RSA_blinding_off(RSA *rsa) 307 { 308 if (rsa->blinding != NULL) 309 { 310 BN_BLINDING_free(rsa->blinding); 311 rsa->blinding=NULL; 312 } 313 rsa->flags &= ~RSA_FLAG_BLINDING; 314 rsa->flags |= RSA_FLAG_NO_BLINDING; 315 } 316 317 int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx) 318 { 319 BIGNUM *A,*Ai = NULL; 320 BN_CTX *ctx; 321 int ret=0; 322 323 if (p_ctx == NULL) 324 { 325 if ((ctx=BN_CTX_new()) == NULL) goto err; 326 } 327 else 328 ctx=p_ctx; 329 330 /* XXXXX: Shouldn't this be RSA_blinding_off(rsa)? */ 331 if (rsa->blinding != NULL) 332 { 333 BN_BLINDING_free(rsa->blinding); 334 rsa->blinding = NULL; 335 } 336 337 /* NB: similar code appears in setup_blinding (rsa_eay.c); 338 * this should be placed in a new function of its own, but for reasons 339 * of binary compatibility can't */ 340 341 BN_CTX_start(ctx); 342 A = BN_CTX_get(ctx); 343 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) 344 { 345 /* if PRNG is not properly seeded, resort to secret exponent as unpredictable seed */ 346 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0); 347 if (!BN_pseudo_rand_range(A,rsa->n)) goto err; 348 } 349 else 350 { 351 if (!BN_rand_range(A,rsa->n)) goto err; 352 } 353 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err; 354 355 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) 356 goto err; 357 if ((rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n)) == NULL) goto err; 358 /* to make things thread-safe without excessive locking, 359 * rsa->blinding will be used just by the current thread: */ 360 rsa->blinding->thread_id = CRYPTO_thread_id(); 361 rsa->flags |= RSA_FLAG_BLINDING; 362 rsa->flags &= ~RSA_FLAG_NO_BLINDING; 363 ret=1; 364 err: 365 if (Ai != NULL) BN_free(Ai); 366 BN_CTX_end(ctx); 367 if (ctx != p_ctx) BN_CTX_free(ctx); 368 return(ret); 369 } 370 371 int RSA_memory_lock(RSA *r) 372 { 373 int i,j,k,off; 374 char *p; 375 BIGNUM *bn,**t[6],*b; 376 BN_ULONG *ul; 377 378 if (r->d == NULL) return(1); 379 t[0]= &r->d; 380 t[1]= &r->p; 381 t[2]= &r->q; 382 t[3]= &r->dmp1; 383 t[4]= &r->dmq1; 384 t[5]= &r->iqmp; 385 k=sizeof(BIGNUM)*6; 386 off=k/sizeof(BN_ULONG)+1; 387 j=1; 388 for (i=0; i<6; i++) 389 j+= (*t[i])->top; 390 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) 391 { 392 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 393 return(0); 394 } 395 bn=(BIGNUM *)p; 396 ul=(BN_ULONG *)&(p[off]); 397 for (i=0; i<6; i++) 398 { 399 b= *(t[i]); 400 *(t[i])= &(bn[i]); 401 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 402 bn[i].flags=BN_FLG_STATIC_DATA; 403 bn[i].d=ul; 404 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 405 ul+=b->top; 406 BN_clear_free(b); 407 } 408 409 /* I should fix this so it can still be done */ 410 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 411 412 r->bignum_data=p; 413 return(1); 414 } 415