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