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 RSA_METHOD *default_RSA_meth=NULL; 70 static int rsa_meth_num=0; 71 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *rsa_meth=NULL; 72 73 RSA *RSA_new(void) 74 { 75 return(RSA_new_method(NULL)); 76 } 77 78 void RSA_set_default_openssl_method(RSA_METHOD *meth) 79 { 80 ENGINE *e; 81 /* We'll need to notify the "openssl" ENGINE of this 82 * change too. We won't bother locking things down at 83 * our end as there was never any locking in these 84 * functions! */ 85 if(default_RSA_meth != meth) 86 { 87 default_RSA_meth = meth; 88 e = ENGINE_by_id("openssl"); 89 if(e) 90 { 91 ENGINE_set_RSA(e, meth); 92 ENGINE_free(e); 93 } 94 } 95 } 96 97 RSA_METHOD *RSA_get_default_openssl_method(void) 98 { 99 if (default_RSA_meth == NULL) 100 { 101 #ifdef RSA_NULL 102 default_RSA_meth=RSA_null_method(); 103 #else 104 #ifdef RSAref 105 default_RSA_meth=RSA_PKCS1_RSAref(); 106 #else 107 default_RSA_meth=RSA_PKCS1_SSLeay(); 108 #endif 109 #endif 110 } 111 112 return default_RSA_meth; 113 } 114 115 RSA_METHOD *RSA_get_method(RSA *rsa) 116 { 117 return ENGINE_get_RSA(rsa->engine); 118 } 119 120 #if 0 121 RSA_METHOD *RSA_set_method(RSA *rsa, RSA_METHOD *meth) 122 { 123 RSA_METHOD *mtmp; 124 mtmp = rsa->meth; 125 if (mtmp->finish) mtmp->finish(rsa); 126 rsa->meth = meth; 127 if (meth->init) meth->init(rsa); 128 return mtmp; 129 } 130 #else 131 int RSA_set_method(RSA *rsa, ENGINE *engine) 132 { 133 ENGINE *mtmp; 134 RSA_METHOD *meth; 135 mtmp = rsa->engine; 136 meth = ENGINE_get_RSA(mtmp); 137 if (!ENGINE_init(engine)) 138 return 0; 139 if (meth->finish) meth->finish(rsa); 140 rsa->engine = engine; 141 meth = ENGINE_get_RSA(engine); 142 if (meth->init) meth->init(rsa); 143 /* SHOULD ERROR CHECK THIS!!! */ 144 ENGINE_finish(mtmp); 145 return 1; 146 } 147 #endif 148 149 #if 0 150 RSA *RSA_new_method(RSA_METHOD *meth) 151 #else 152 RSA *RSA_new_method(ENGINE *engine) 153 #endif 154 { 155 RSA_METHOD *meth; 156 RSA *ret; 157 158 ret=(RSA *)OPENSSL_malloc(sizeof(RSA)); 159 if (ret == NULL) 160 { 161 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 162 return(NULL); 163 } 164 165 if (engine == NULL) 166 { 167 if((ret->engine=ENGINE_get_default_RSA()) == NULL) 168 { 169 OPENSSL_free(ret); 170 return NULL; 171 } 172 } 173 else 174 ret->engine=engine; 175 meth = ENGINE_get_RSA(ret->engine); 176 177 ret->pad=0; 178 ret->version=0; 179 ret->n=NULL; 180 ret->e=NULL; 181 ret->d=NULL; 182 ret->p=NULL; 183 ret->q=NULL; 184 ret->dmp1=NULL; 185 ret->dmq1=NULL; 186 ret->iqmp=NULL; 187 ret->references=1; 188 ret->_method_mod_n=NULL; 189 ret->_method_mod_p=NULL; 190 ret->_method_mod_q=NULL; 191 ret->blinding=NULL; 192 ret->bignum_data=NULL; 193 ret->flags=meth->flags; 194 CRYPTO_new_ex_data(rsa_meth,ret,&ret->ex_data); 195 if ((meth->init != NULL) && !meth->init(ret)) 196 { 197 CRYPTO_free_ex_data(rsa_meth,ret,&ret->ex_data); 198 OPENSSL_free(ret); 199 ret=NULL; 200 } 201 return(ret); 202 } 203 204 void RSA_free(RSA *r) 205 { 206 RSA_METHOD *meth; 207 int i; 208 209 if (r == NULL) return; 210 211 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 212 #ifdef REF_PRINT 213 REF_PRINT("RSA",r); 214 #endif 215 if (i > 0) return; 216 #ifdef REF_CHECK 217 if (i < 0) 218 { 219 fprintf(stderr,"RSA_free, bad reference count\n"); 220 abort(); 221 } 222 #endif 223 224 meth = ENGINE_get_RSA(r->engine); 225 if (meth->finish != NULL) 226 meth->finish(r); 227 ENGINE_finish(r->engine); 228 229 CRYPTO_free_ex_data(rsa_meth,r,&r->ex_data); 230 231 if (r->n != NULL) BN_clear_free(r->n); 232 if (r->e != NULL) BN_clear_free(r->e); 233 if (r->d != NULL) BN_clear_free(r->d); 234 if (r->p != NULL) BN_clear_free(r->p); 235 if (r->q != NULL) BN_clear_free(r->q); 236 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 237 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 238 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 239 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 240 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data); 241 OPENSSL_free(r); 242 } 243 244 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 245 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 246 { 247 rsa_meth_num++; 248 return(CRYPTO_get_ex_new_index(rsa_meth_num-1, 249 &rsa_meth,argl,argp,new_func,dup_func,free_func)); 250 } 251 252 int RSA_set_ex_data(RSA *r, int idx, void *arg) 253 { 254 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 255 } 256 257 void *RSA_get_ex_data(RSA *r, int idx) 258 { 259 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 260 } 261 262 int RSA_size(RSA *r) 263 { 264 return(BN_num_bytes(r->n)); 265 } 266 267 int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to, 268 RSA *rsa, int padding) 269 { 270 return(ENGINE_get_RSA(rsa->engine)->rsa_pub_enc(flen, 271 from, to, rsa, padding)); 272 } 273 274 int RSA_private_encrypt(int flen, unsigned char *from, unsigned char *to, 275 RSA *rsa, int padding) 276 { 277 return(ENGINE_get_RSA(rsa->engine)->rsa_priv_enc(flen, 278 from, to, rsa, padding)); 279 } 280 281 int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to, 282 RSA *rsa, int padding) 283 { 284 return(ENGINE_get_RSA(rsa->engine)->rsa_priv_dec(flen, 285 from, to, rsa, padding)); 286 } 287 288 int RSA_public_decrypt(int flen, unsigned char *from, unsigned char *to, 289 RSA *rsa, int padding) 290 { 291 return(ENGINE_get_RSA(rsa->engine)->rsa_pub_dec(flen, 292 from, to, rsa, padding)); 293 } 294 295 int RSA_flags(RSA *r) 296 { 297 return((r == NULL)?0:ENGINE_get_RSA(r->engine)->flags); 298 } 299 300 void RSA_blinding_off(RSA *rsa) 301 { 302 if (rsa->blinding != NULL) 303 { 304 BN_BLINDING_free(rsa->blinding); 305 rsa->blinding=NULL; 306 } 307 rsa->flags&= ~RSA_FLAG_BLINDING; 308 } 309 310 int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx) 311 { 312 BIGNUM *A,*Ai; 313 BN_CTX *ctx; 314 int ret=0; 315 316 if (p_ctx == NULL) 317 { 318 if ((ctx=BN_CTX_new()) == NULL) goto err; 319 } 320 else 321 ctx=p_ctx; 322 323 if (rsa->blinding != NULL) 324 BN_BLINDING_free(rsa->blinding); 325 326 BN_CTX_start(ctx); 327 A = BN_CTX_get(ctx); 328 if (!BN_rand_range(A,rsa->n)) goto err; 329 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err; 330 331 if (!ENGINE_get_RSA(rsa->engine)->bn_mod_exp(A,A, 332 rsa->e,rsa->n,ctx,rsa->_method_mod_n)) 333 goto err; 334 rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n); 335 rsa->flags|=RSA_FLAG_BLINDING; 336 BN_free(Ai); 337 ret=1; 338 err: 339 BN_CTX_end(ctx); 340 if (ctx != p_ctx) BN_CTX_free(ctx); 341 return(ret); 342 } 343 344 int RSA_memory_lock(RSA *r) 345 { 346 int i,j,k,off; 347 char *p; 348 BIGNUM *bn,**t[6],*b; 349 BN_ULONG *ul; 350 351 if (r->d == NULL) return(1); 352 t[0]= &r->d; 353 t[1]= &r->p; 354 t[2]= &r->q; 355 t[3]= &r->dmp1; 356 t[4]= &r->dmq1; 357 t[5]= &r->iqmp; 358 k=sizeof(BIGNUM)*6; 359 off=k/sizeof(BN_ULONG)+1; 360 j=1; 361 for (i=0; i<6; i++) 362 j+= (*t[i])->top; 363 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL) 364 { 365 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 366 return(0); 367 } 368 bn=(BIGNUM *)p; 369 ul=(BN_ULONG *)&(p[off]); 370 for (i=0; i<6; i++) 371 { 372 b= *(t[i]); 373 *(t[i])= &(bn[i]); 374 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 375 bn[i].flags=BN_FLG_STATIC_DATA; 376 bn[i].d=ul; 377 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 378 ul+=b->top; 379 BN_clear_free(b); 380 } 381 382 /* I should fix this so it can still be done */ 383 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 384 385 r->bignum_data=p; 386 return(1); 387 } 388 389