release/src/router/openssl/crypto/rsa/rsa_crpt.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 int RSA_size(const RSA *r)
  71         {
  72         return(BN_num_bytes(r->n));
  73         }
  74
  75 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
  76              RSA *rsa, int padding)
  77         {
  78 #ifdef OPENSSL_FIPS
  79         if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
  80                         && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
  81                 {
  82                 RSAerr(RSA_F_RSA_PUBLIC_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD);
  83                 return -1;
  84                 }
  85 #endif
  86         return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
  87         }
  88
  89 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
  90              RSA *rsa, int padding)
  91         {
  92 #ifdef OPENSSL_FIPS
  93         if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
  94                         && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
  95                 {
  96                 RSAerr(RSA_F_RSA_PRIVATE_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD);
  97                 return -1;
  98                 }
  99 #endif
 100         return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
 101         }
 102
 103 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
 104              RSA *rsa, int padding)
 105         {
 106 #ifdef OPENSSL_FIPS
 107         if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
 108                         && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
 109                 {
 110                 RSAerr(RSA_F_RSA_PRIVATE_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD);
 111                 return -1;
 112                 }
 113 #endif
 114         return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
 115         }
 116
 117 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
 118              RSA *rsa, int padding)
 119         {
 120 #ifdef OPENSSL_FIPS
 121         if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD)
 122                         && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
 123                 {
 124                 RSAerr(RSA_F_RSA_PUBLIC_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD);
 125                 return -1;
 126                 }
 127 #endif
 128         return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
 129         }
 130
 131 int RSA_flags(const RSA *r)
 132         {
 133         return((r == NULL)?0:r->meth->flags);
 134         }
 135
 136 void RSA_blinding_off(RSA *rsa)
 137         {
 138         if (rsa->blinding != NULL)
 139                 {
 140                 BN_BLINDING_free(rsa->blinding);
 141                 rsa->blinding=NULL;
 142                 }
 143         rsa->flags &= ~RSA_FLAG_BLINDING;
 144         rsa->flags |= RSA_FLAG_NO_BLINDING;
 145         }
 146
 147 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
 148         {
 149         int ret=0;
 150
 151         if (rsa->blinding != NULL)
 152                 RSA_blinding_off(rsa);
 153
 154         rsa->blinding = RSA_setup_blinding(rsa, ctx);
 155         if (rsa->blinding == NULL)
 156                 goto err;
 157
 158         rsa->flags |= RSA_FLAG_BLINDING;
 159         rsa->flags &= ~RSA_FLAG_NO_BLINDING;
 160         ret=1;
 161 err:
 162         return(ret);
 163         }
 164
 165 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
 166         const BIGNUM *q, BN_CTX *ctx)
 167 {
 168         BIGNUM *ret = NULL, *r0, *r1, *r2;
 169
 170         if (d == NULL || p == NULL || q == NULL)
 171                 return NULL;
 172
 173         BN_CTX_start(ctx);
 174         r0 = BN_CTX_get(ctx);
 175         r1 = BN_CTX_get(ctx);
 176         r2 = BN_CTX_get(ctx);
 177         if (r2 == NULL)
 178                 goto err;
 179
 180         if (!BN_sub(r1, p, BN_value_one())) goto err;
 181         if (!BN_sub(r2, q, BN_value_one())) goto err;
 182         if (!BN_mul(r0, r1, r2, ctx)) goto err;
 183
 184         ret = BN_mod_inverse(NULL, d, r0, ctx);
 185 err:
 186         BN_CTX_end(ctx);
 187         return ret;
 188 }
 189
 190 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
 191 {
 192         BIGNUM local_n;
 193         BIGNUM *e,*n;
 194         BN_CTX *ctx;
 195         BN_BLINDING *ret = NULL;
 196
 197         if (in_ctx == NULL)
 198                 {
 199                 if ((ctx = BN_CTX_new()) == NULL) return 0;
 200                 }
 201         else
 202                 ctx = in_ctx;
 203
 204         BN_CTX_start(ctx);
 205         e  = BN_CTX_get(ctx);
 206         if (e == NULL)
 207                 {
 208                 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
 209                 goto err;
 210                 }
 211
 212         if (rsa->e == NULL)
 213                 {
 214                 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
 215                 if (e == NULL)
 216                         {
 217                         RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
 218                         goto err;
 219                         }
 220                 }
 221         else
 222                 e = rsa->e;
 223
 224
 225         if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
 226                 {
 227                 /* if PRNG is not properly seeded, resort to secret
 228                  * exponent as unpredictable seed */
 229                 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
 230                 }
 231
 232         if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
 233                 {
 234                 /* Set BN_FLG_CONSTTIME flag */
 235                 n = &local_n;
 236                 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
 237                 }
 238         else
 239                 n = rsa->n;
 240
 241         ret = BN_BLINDING_create_param(NULL, e, n, ctx,
 242                         rsa->meth->bn_mod_exp, rsa->_method_mod_n);
 243         if (ret == NULL)
 244                 {
 245                 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
 246                 goto err;
 247                 }
 248         CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
 249 err:
 250         BN_CTX_end(ctx);
 251         if (in_ctx == NULL)
 252                 BN_CTX_free(ctx);
 253         if(rsa->e == NULL)
 254                 BN_free(e);
 255
 256         return ret;
 257 }