crypto/rsa/rsa_lib.c

   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 *e;
 365         BN_CTX *ctx;
 366         BN_BLINDING *ret = NULL;
 367
 368         if (in_ctx == NULL)
 369                 {
 370                 if ((ctx = BN_CTX_new()) == NULL) return 0;
 371                 }
 372         else
 373                 ctx = in_ctx;
 374
 375         BN_CTX_start(ctx);
 376         e  = BN_CTX_get(ctx);
 377         if (e == NULL)
 378                 {
 379                 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
 380                 goto err;
 381                 }
 382
 383         if (rsa->e == NULL)
 384                 {
 385                 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
 386                 if (e == NULL)
 387                         {
 388                         RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
 389                         goto err;
 390                         }
 391                 }
 392         else
 393                 e = rsa->e;
 394
 395
 396         if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
 397                 {
 398                 /* if PRNG is not properly seeded, resort to secret
 399                  * exponent as unpredictable seed */
 400                 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
 401                 }
 402
 403         ret = BN_BLINDING_create_param(NULL, e, rsa->n, ctx,
 404                         rsa->meth->bn_mod_exp, rsa->_method_mod_n);
 405         if (ret == NULL)
 406                 {
 407                 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
 408                 goto err;
 409                 }
 410         BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id());
 411         BN_BLINDING_set_thread_idptr(ret, CRYPTO_thread_idptr());
 412 err:
 413         BN_CTX_end(ctx);
 414         if (in_ctx == NULL)
 415                 BN_CTX_free(ctx);
 416
 417         return ret;
 418 }
 419
 420 int RSA_memory_lock(RSA *r)
 421         {
 422         int i,j,k,off;
 423         char *p;
 424         BIGNUM *bn,**t[6],*b;
 425         BN_ULONG *ul;
 426
 427         if (r->d == NULL) return(1);
 428         t[0]= &r->d;
 429         t[1]= &r->p;
 430         t[2]= &r->q;
 431         t[3]= &r->dmp1;
 432         t[4]= &r->dmq1;
 433         t[5]= &r->iqmp;
 434         k=sizeof(BIGNUM)*6;
 435         off=k/sizeof(BN_ULONG)+1;
 436         j=1;
 437         for (i=0; i<6; i++)
 438                 j+= (*t[i])->top;
 439         if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
 440                 {
 441                 RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
 442                 return(0);
 443                 }
 444         bn=(BIGNUM *)p;
 445         ul=(BN_ULONG *)&(p[off]);
 446         for (i=0; i<6; i++)
 447                 {
 448                 b= *(t[i]);
 449                 *(t[i])= &(bn[i]);
 450                 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
 451                 bn[i].flags=BN_FLG_STATIC_DATA;
 452                 bn[i].d=ul;
 453                 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
 454                 ul+=b->top;
 455                 BN_clear_free(b);
 456                 }
 457
 458         /* I should fix this so it can still be done */
 459         r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
 460
 461         r->bignum_data=p;
 462         return(1);
 463         }