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 "crypto.h"
  61 #include "cryptlib.h"
  62 #include "lhash.h"
  63 #include "bn.h"
  64 #include "rsa.h"
  65
  66 char *RSA_version="RSA part of SSLeay 0.9.0b 29-Jun-1998";
  67
  68 static RSA_METHOD *default_RSA_meth=NULL;
  69 static int rsa_meth_num=0;
  70 static STACK *rsa_meth=NULL;
  71
  72 RSA *RSA_new()
  73         {
  74         return(RSA_new_method(NULL));
  75         }
  76
  77 void RSA_set_default_method(meth)
  78 RSA_METHOD *meth;
  79         {
  80         default_RSA_meth=meth;
  81         }
  82
  83 RSA *RSA_new_method(meth)
  84 RSA_METHOD *meth;
  85         {
  86         RSA *ret;
  87
  88         if (default_RSA_meth == NULL)
  89                 {
  90 #ifdef RSAref
  91                 default_RSA_meth=RSA_PKCS1_RSAref();
  92 #else
  93                 default_RSA_meth=RSA_PKCS1_SSLeay();
  94 #endif
  95                 }
  96         ret=(RSA *)Malloc(sizeof(RSA));
  97         if (ret == NULL)
  98                 {
  99                 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 100                 return(NULL);
 101                 }
 102
 103         if (meth == NULL)
 104                 ret->meth=default_RSA_meth;
 105         else
 106                 ret->meth=meth;
 107
 108         ret->pad=0;
 109         ret->version=0;
 110         ret->n=NULL;
 111         ret->e=NULL;
 112         ret->d=NULL;
 113         ret->p=NULL;
 114         ret->q=NULL;
 115         ret->dmp1=NULL;
 116         ret->dmq1=NULL;
 117         ret->iqmp=NULL;
 118         ret->references=1;
 119         ret->method_mod_n=NULL;
 120         ret->method_mod_p=NULL;
 121         ret->method_mod_q=NULL;
 122         ret->blinding=NULL;
 123         ret->flags=ret->meth->flags;
 124         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 125                 {
 126                 Free(ret);
 127                 ret=NULL;
 128                 }
 129         CRYPTO_new_ex_data(rsa_meth,(char *)ret,&ret->ex_data);
 130         return(ret);
 131         }
 132
 133 void RSA_free(r)
 134 RSA *r;
 135         {
 136         int i;
 137
 138         if (r == NULL) return;
 139
 140         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
 141 #ifdef REF_PRINT
 142         REF_PRINT("RSA",r);
 143 #endif
 144         if (i > 0) return;
 145 #ifdef REF_CHECK
 146         if (i < 0)
 147                 {
 148                 fprintf(stderr,"RSA_free, bad reference count\n");
 149                 abort();
 150                 }
 151 #endif
 152
 153         CRYPTO_free_ex_data(rsa_meth,(char *)r,&r->ex_data);
 154
 155         if (r->meth->finish != NULL)
 156                 r->meth->finish(r);
 157
 158         if (r->n != NULL) BN_clear_free(r->n);
 159         if (r->e != NULL) BN_clear_free(r->e);
 160         if (r->d != NULL) BN_clear_free(r->d);
 161         if (r->p != NULL) BN_clear_free(r->p);
 162         if (r->q != NULL) BN_clear_free(r->q);
 163         if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
 164         if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
 165         if (r->iqmp != NULL) BN_clear_free(r->iqmp);
 166         if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
 167         Free(r);
 168         }
 169
 170 int RSA_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
 171 long argl;
 172 char *argp;
 173 int (*new_func)();
 174 int (*dup_func)();
 175 void (*free_func)();
 176         {
 177         rsa_meth_num++;
 178         return(CRYPTO_get_ex_new_index(rsa_meth_num-1,
 179                 &rsa_meth,argl,argp,new_func,dup_func,free_func));
 180         }
 181
 182 int RSA_set_ex_data(r,idx,arg)
 183 RSA *r;
 184 int idx;
 185 char *arg;
 186         {
 187         return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
 188         }
 189
 190 char *RSA_get_ex_data(r,idx)
 191 RSA *r;
 192 int idx;
 193         {
 194         return(CRYPTO_get_ex_data(&r->ex_data,idx));
 195         }
 196
 197 int RSA_size(r)
 198 RSA *r;
 199         {
 200         return(BN_num_bytes(r->n));
 201         }
 202
 203 int RSA_public_encrypt(flen, from, to, rsa, padding)
 204 int flen;
 205 unsigned char *from;
 206 unsigned char *to;
 207 RSA *rsa;
 208 int padding;
 209         {
 210         return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
 211         }
 212
 213 int RSA_private_encrypt(flen, from, to, rsa, padding)
 214 int flen;
 215 unsigned char *from;
 216 unsigned char *to;
 217 RSA *rsa;
 218 int padding;
 219         {
 220         return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
 221         }
 222
 223 int RSA_private_decrypt(flen, from, to, rsa, padding)
 224 int flen;
 225 unsigned char *from;
 226 unsigned char *to;
 227 RSA *rsa;
 228 int padding;
 229         {
 230         return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
 231         }
 232
 233 int RSA_public_decrypt(flen, from, to, rsa, padding)
 234 int flen;
 235 unsigned char *from;
 236 unsigned char *to;
 237 RSA *rsa;
 238 int padding;
 239         {
 240         return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
 241         }
 242
 243 int RSA_flags(r)
 244 RSA *r;
 245         {
 246         return((r == NULL)?0:r->meth->flags);
 247         }
 248
 249 void RSA_blinding_off(rsa)
 250 RSA *rsa;
 251         {
 252         if (rsa->blinding != NULL)
 253                 {
 254                 BN_BLINDING_free(rsa->blinding);
 255                 rsa->blinding=NULL;
 256                 }
 257         rsa->flags&= ~RSA_FLAG_BLINDING;
 258         }
 259
 260 int RSA_blinding_on(rsa,p_ctx)
 261 RSA *rsa;
 262 BN_CTX *p_ctx;
 263         {
 264         BIGNUM *A,*Ai;
 265         BN_CTX *ctx;
 266         int ret=0;
 267
 268         if (p_ctx == NULL)
 269                 {
 270                 if ((ctx=BN_CTX_new()) == NULL) goto err;
 271                 }
 272         else
 273                 ctx=p_ctx;
 274
 275         if (rsa->blinding != NULL)
 276                 BN_BLINDING_free(rsa->blinding);
 277
 278         A=ctx->bn[0];
 279         ctx->tos++;
 280         if (!BN_rand(A,BN_num_bits(rsa->n)-1,1,0)) goto err;
 281         if ((Ai=BN_mod_inverse(A,rsa->n,ctx)) == NULL) goto err;
 282
 283         if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,
 284                 (char *)rsa->method_mod_n)) goto err;
 285         rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n);
 286         ctx->tos--;
 287         rsa->flags|=RSA_FLAG_BLINDING;
 288         BN_free(Ai);
 289         ret=1;
 290 err:
 291         if (ctx != p_ctx) BN_CTX_free(ctx);
 292         return(ret);
 293         }
 294