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 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(const 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 const 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 #if 0 /* was: #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 const RSA_METHOD *RSA_get_method(const 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         const 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         const 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         if ((meth->init != NULL) && !meth->init(ret))
 195                 {
 196                 OPENSSL_free(ret);
 197                 ret=NULL;
 198                 }
 199         else
 200                 CRYPTO_new_ex_data(rsa_meth,ret,&ret->ex_data);
 201         return(ret);
 202         }
 203
 204 void RSA_free(RSA *r)
 205         {
 206         const 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         CRYPTO_free_ex_data(rsa_meth,r,&r->ex_data);
 225
 226         meth = ENGINE_get_RSA(r->engine);
 227         if (meth->finish != NULL)
 228                 meth->finish(r);
 229         ENGINE_finish(r->engine);
 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(const RSA *r, int idx)
 258         {
 259         return(CRYPTO_get_ex_data(&r->ex_data,idx));
 260         }
 261
 262 int RSA_size(const RSA *r)
 263         {
 264         return(BN_num_bytes(r->n));
 265         }
 266
 267 int RSA_public_encrypt(int flen, const 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, const 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, const 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, const 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(const 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(A,BN_num_bits(rsa->n)-1,1,0)) 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