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/engine.h> 66 67 const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT; 68 69 static const RSA_METHOD *default_RSA_meth=NULL; 70 71 RSA *RSA_new(void) 72 { 73 RSA *r=RSA_new_method(NULL); 74 75 #ifndef OPENSSL_NO_FORCE_RSA_BLINDING 76 r->flags|=RSA_FLAG_BLINDING; 77 #endif 78 79 return r; 80 } 81 82 void RSA_set_default_method(const RSA_METHOD *meth) 83 { 84 default_RSA_meth = meth; 85 } 86 87 const RSA_METHOD *RSA_get_default_method(void) 88 { 89 if (default_RSA_meth == NULL) 90 { 91 #ifdef RSA_NULL 92 default_RSA_meth=RSA_null_method(); 93 #else 94 #if 0 /* was: #ifdef RSAref */ 95 default_RSA_meth=RSA_PKCS1_RSAref(); 96 #else 97 default_RSA_meth=RSA_PKCS1_SSLeay(); 98 #endif 99 #endif 100 } 101 102 return default_RSA_meth; 103 } 104 105 const RSA_METHOD *RSA_get_method(const RSA *rsa) 106 { 107 return rsa->meth; 108 } 109 110 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth) 111 { 112 /* NB: The caller is specifically setting a method, so it's not up to us 113 * to deal with which ENGINE it comes from. */ 114 const RSA_METHOD *mtmp; 115 mtmp = rsa->meth; 116 if (mtmp->finish) mtmp->finish(rsa); 117 if (rsa->engine) 118 { 119 ENGINE_finish(rsa->engine); 120 rsa->engine = NULL; 121 } 122 rsa->meth = meth; 123 if (meth->init) meth->init(rsa); 124 return 1; 125 } 126 127 RSA *RSA_new_method(ENGINE *engine) 128 { 129 RSA *ret; 130 131 ret=(RSA *)OPENSSL_malloc(sizeof(RSA)); 132 if (ret == NULL) 133 { 134 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 135 return NULL; 136 } 137 138 ret->meth = RSA_get_default_method(); 139 if (engine) 140 { 141 if (!ENGINE_init(engine)) 142 { 143 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); 144 OPENSSL_free(ret); 145 return NULL; 146 } 147 ret->engine = engine; 148 } 149 else 150 ret->engine = ENGINE_get_default_RSA(); 151 if(ret->engine) 152 { 153 ret->meth = ENGINE_get_RSA(ret->engine); 154 if(!ret->meth) 155 { 156 RSAerr(RSA_F_RSA_NEW_METHOD, 157 ERR_R_ENGINE_LIB); 158 ENGINE_finish(ret->engine); 159 OPENSSL_free(ret); 160 return NULL; 161 } 162 } 163 164 ret->pad=0; 165 ret->version=0; 166 ret->n=NULL; 167 ret->e=NULL; 168 ret->d=NULL; 169 ret->p=NULL; 170 ret->q=NULL; 171 ret->dmp1=NULL; 172 ret->dmq1=NULL; 173 ret->iqmp=NULL; 174 ret->references=1; 175 ret->_method_mod_n=NULL; 176 ret->_method_mod_p=NULL; 177 ret->_method_mod_q=NULL; 178 ret->blinding=NULL; 179 ret->bignum_data=NULL; 180 ret->flags=ret->meth->flags; 181 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 182 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 183 { 184 if (ret->engine) 185 ENGINE_finish(ret->engine); 186 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 187 OPENSSL_free(ret); 188 ret=NULL; 189 } 190 return(ret); 191 } 192 193 void RSA_free(RSA *r) 194 { 195 int i; 196 197 if (r == NULL) return; 198 199 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 200 #ifdef REF_PRINT 201 REF_PRINT("RSA",r); 202 #endif 203 if (i > 0) return; 204 #ifdef REF_CHECK 205 if (i < 0) 206 { 207 fprintf(stderr,"RSA_free, bad reference count\n"); 208 abort(); 209 } 210 #endif 211 212 if (r->meth->finish) 213 r->meth->finish(r); 214 if (r->engine) 215 ENGINE_finish(r->engine); 216 217 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 218 219 if (r->n != NULL) BN_clear_free(r->n); 220 if (r->e != NULL) BN_clear_free(r->e); 221 if (r->d != NULL) BN_clear_free(r->d); 222 if (r->p != NULL) BN_clear_free(r->p); 223 if (r->q != NULL) BN_clear_free(r->q); 224 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 225 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 226 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 227 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 228 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); 229 OPENSSL_free(r); 230 } 231 232 int RSA_up_ref(RSA *r) 233 { 234 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 235 #ifdef REF_PRINT 236 REF_PRINT("RSA",r); 237 #endif 238 #ifdef REF_CHECK 239 if (i < 2) 240 { 241 fprintf(stderr, "RSA_up_ref, bad reference count\n"); 242 abort(); 243 } 244 #endif 245 return ((i > 1) ? 1 : 0); 246 } 247 248 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 249 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 250 { 251 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 252 new_func, dup_func, free_func); 253 } 254 255 int RSA_set_ex_data(RSA *r, int idx, void *arg) 256 { 257 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 258 } 259 260 void *RSA_get_ex_data(const RSA *r, int idx) 261 { 262 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 263 } 264 265 int RSA_size(const RSA *r) 266 { 267 return(BN_num_bytes(r->n)); 268 } 269 270 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, 271 RSA *rsa, int padding) 272 { 273 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); 274 } 275 276 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to, 277 RSA *rsa, int padding) 278 { 279 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); 280 } 281 282 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to, 283 RSA *rsa, int padding) 284 { 285 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); 286 } 287 288 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, 289 RSA *rsa, int padding) 290 { 291 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); 292 } 293 294 int RSA_flags(const RSA *r) 295 { 296 return((r == NULL)?0:r->meth->flags); 297 } 298 299 void RSA_blinding_off(RSA *rsa) 300 { 301 if (rsa->blinding != NULL) 302 { 303 BN_BLINDING_free(rsa->blinding); 304 rsa->blinding=NULL; 305 } 306 rsa->flags&= ~RSA_FLAG_BLINDING; 307 } 308 309 int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx) 310 { 311 BIGNUM *A,*Ai; 312 BN_CTX *ctx; 313 int ret=0; 314 315 if (p_ctx == NULL) 316 { 317 if ((ctx=BN_CTX_new()) == NULL) goto err; 318 } 319 else 320 ctx=p_ctx; 321 322 if (rsa->blinding != NULL) 323 BN_BLINDING_free(rsa->blinding); 324 325 BN_CTX_start(ctx); 326 A = BN_CTX_get(ctx); 327 if (!BN_rand_range(A,rsa->n)) goto err; 328 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err; 329 330 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) 331 goto err; 332 rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n); 333 rsa->flags|=RSA_FLAG_BLINDING; 334 BN_free(Ai); 335 ret=1; 336 err: 337 BN_CTX_end(ctx); 338 if (ctx != p_ctx) BN_CTX_free(ctx); 339 return(ret); 340 } 341 342 int RSA_memory_lock(RSA *r) 343 { 344 int i,j,k,off; 345 char *p; 346 BIGNUM *bn,**t[6],*b; 347 BN_ULONG *ul; 348 349 if (r->d == NULL) return(1); 350 t[0]= &r->d; 351 t[1]= &r->p; 352 t[2]= &r->q; 353 t[3]= &r->dmp1; 354 t[4]= &r->dmq1; 355 t[5]= &r->iqmp; 356 k=sizeof(BIGNUM)*6; 357 off=k/sizeof(BN_ULONG)+1; 358 j=1; 359 for (i=0; i<6; i++) 360 j+= (*t[i])->top; 361 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) 362 { 363 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 364 return(0); 365 } 366 bn=(BIGNUM *)p; 367 ul=(BN_ULONG *)&(p[off]); 368 for (i=0; i<6; i++) 369 { 370 b= *(t[i]); 371 *(t[i])= &(bn[i]); 372 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 373 bn[i].flags=BN_FLG_STATIC_DATA; 374 bn[i].d=ul; 375 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 376 ul+=b->top; 377 BN_clear_free(b); 378 } 379 380 /* I should fix this so it can still be done */ 381 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 382 383 r->bignum_data=p; 384 return(1); 385 } 386