OSX/libsecurity_apple_csp/open_ssl/bn/bn_blind.c

   1 /*
   2  * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* crypto/bn/bn_blind.c */
  20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  21  * All rights reserved.
  22  *
  23  * This package is an SSL implementation written
  24  * by Eric Young (eay@cryptsoft.com).
  25  * The implementation was written so as to conform with Netscapes SSL.
  26  *
  27  * This library is free for commercial and non-commercial use as long as
  28  * the following conditions are aheared to.  The following conditions
  29  * apply to all code found in this distribution, be it the RC4, RSA,
  30  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  31  * included with this distribution is covered by the same copyright terms
  32  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  33  *
  34  * Copyright remains Eric Young's, and as such any Copyright notices in
  35  * the code are not to be removed.
  36  * If this package is used in a product, Eric Young should be given attribution
  37  * as the author of the parts of the library used.
  38  * This can be in the form of a textual message at program startup or
  39  * in documentation (online or textual) provided with the package.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *    "This product includes cryptographic software written by
  52  *     Eric Young (eay@cryptsoft.com)"
  53  *    The word 'cryptographic' can be left out if the rouines from the library
  54  *    being used are not cryptographic related :-).
  55  * 4. If you include any Windows specific code (or a derivative thereof) from
  56  *    the apps directory (application code) you must include an acknowledgement:
  57  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  * The licence and distribution terms for any publically available version or
  72  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  73  * copied and put under another distribution licence
  74  * [including the GNU Public Licence.]
  75  */
  76
  77 #include <stdio.h>
  78 #include "cryptlib.h"
  79 #include "bn_lcl.h"
  80
  81 BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod)
  82         {
  83         BN_BLINDING *ret=NULL;
  84
  85         bn_check_top(Ai);
  86         bn_check_top(mod);
  87
  88         if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL)
  89                 {
  90                 BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE);
  91                 return(NULL);
  92                 }
  93         memset(ret,0,sizeof(BN_BLINDING));
  94         if ((ret->A=BN_new()) == NULL) goto err;
  95         if ((ret->Ai=BN_new()) == NULL) goto err;
  96         if (!BN_copy(ret->A,A)) goto err;
  97         if (!BN_copy(ret->Ai,Ai)) goto err;
  98         ret->mod=mod;
  99         return(ret);
 100 err:
 101         if (ret != NULL) BN_BLINDING_free(ret);
 102         return(NULL);
 103         }
 104
 105 void BN_BLINDING_free(BN_BLINDING *r)
 106         {
 107         if(r == NULL)
 108             return;
 109
 110         if (r->A  != NULL) BN_free(r->A );
 111         if (r->Ai != NULL) BN_free(r->Ai);
 112         Free(r);
 113         }
 114
 115 int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
 116         {
 117         int ret=0;
 118
 119         if ((b->A == NULL) || (b->Ai == NULL))
 120                 {
 121                 BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED);
 122                 goto err;
 123                 }
 124
 125         if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err;
 126         if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err;
 127
 128         ret=1;
 129 err:
 130         return(ret);
 131         }
 132
 133 int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
 134         {
 135         bn_check_top(n);
 136
 137         if ((b->A == NULL) || (b->Ai == NULL))
 138                 {
 139                 BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED);
 140                 return(0);
 141                 }
 142         return(BN_mod_mul(n,n,b->A,b->mod,ctx));
 143         }
 144
 145 int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
 146         {
 147         int ret;
 148
 149         bn_check_top(n);
 150         if ((b->A == NULL) || (b->Ai == NULL))
 151                 {
 152                 BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED);
 153                 return(0);
 154                 }
 155         if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0)
 156                 {
 157                 if (!BN_BLINDING_update(b,ctx))
 158                         return(0);
 159                 }
 160         return(ret);
 161         }
 162