144 lines
4.8 KiB
C
144 lines
4.8 KiB
C
/* crypto/bn/bn_blind.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include "bn_lcl.h"
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BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod)
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{
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BN_BLINDING *ret=NULL;
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bn_check_top(Ai);
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bn_check_top(mod);
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if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL)
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{
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BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE);
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return(NULL);
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}
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memset(ret,0,sizeof(BN_BLINDING));
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if ((ret->A=BN_new()) == NULL) goto err;
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if ((ret->Ai=BN_new()) == NULL) goto err;
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if (!BN_copy(ret->A,A)) goto err;
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if (!BN_copy(ret->Ai,Ai)) goto err;
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ret->mod=mod;
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return(ret);
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err:
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if (ret != NULL) BN_BLINDING_free(ret);
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return(NULL);
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}
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void BN_BLINDING_free(BN_BLINDING *r)
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{
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if(r == NULL)
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return;
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if (r->A != NULL) BN_free(r->A );
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if (r->Ai != NULL) BN_free(r->Ai);
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Free(r);
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}
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int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
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{
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int ret=0;
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if ((b->A == NULL) || (b->Ai == NULL))
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{
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BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED);
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goto err;
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}
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if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err;
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if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err;
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ret=1;
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err:
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return(ret);
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}
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int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
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{
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bn_check_top(n);
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if ((b->A == NULL) || (b->Ai == NULL))
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{
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BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED);
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return(0);
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}
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return(BN_mod_mul(n,n,b->A,b->mod,ctx));
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}
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int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
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{
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int ret;
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bn_check_top(n);
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if ((b->A == NULL) || (b->Ai == NULL))
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{
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BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED);
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return(0);
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}
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if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0)
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{
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if (!BN_BLINDING_update(b,ctx))
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return(0);
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}
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return(ret);
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}
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