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