bn_blind.c revision 55714
155714Skris/* crypto/bn/bn_blind.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include "bn_lcl.h" 6255714Skris 6355714SkrisBN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod) 6455714Skris { 6555714Skris BN_BLINDING *ret=NULL; 6655714Skris 6755714Skris bn_check_top(Ai); 6855714Skris bn_check_top(mod); 6955714Skris 7055714Skris if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL) 7155714Skris { 7255714Skris BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE); 7355714Skris return(NULL); 7455714Skris } 7555714Skris memset(ret,0,sizeof(BN_BLINDING)); 7655714Skris if ((ret->A=BN_new()) == NULL) goto err; 7755714Skris if ((ret->Ai=BN_new()) == NULL) goto err; 7855714Skris if (!BN_copy(ret->A,A)) goto err; 7955714Skris if (!BN_copy(ret->Ai,Ai)) goto err; 8055714Skris ret->mod=mod; 8155714Skris return(ret); 8255714Skriserr: 8355714Skris if (ret != NULL) BN_BLINDING_free(ret); 8455714Skris return(NULL); 8555714Skris } 8655714Skris 8755714Skrisvoid BN_BLINDING_free(BN_BLINDING *r) 8855714Skris { 8955714Skris if(r == NULL) 9055714Skris return; 9155714Skris 9255714Skris if (r->A != NULL) BN_free(r->A ); 9355714Skris if (r->Ai != NULL) BN_free(r->Ai); 9455714Skris Free(r); 9555714Skris } 9655714Skris 9755714Skrisint BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) 9855714Skris { 9955714Skris int ret=0; 10055714Skris 10155714Skris if ((b->A == NULL) || (b->Ai == NULL)) 10255714Skris { 10355714Skris BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED); 10455714Skris goto err; 10555714Skris } 10655714Skris 10755714Skris if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err; 10855714Skris if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err; 10955714Skris 11055714Skris ret=1; 11155714Skriserr: 11255714Skris return(ret); 11355714Skris } 11455714Skris 11555714Skrisint BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) 11655714Skris { 11755714Skris bn_check_top(n); 11855714Skris 11955714Skris if ((b->A == NULL) || (b->Ai == NULL)) 12055714Skris { 12155714Skris BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED); 12255714Skris return(0); 12355714Skris } 12455714Skris return(BN_mod_mul(n,n,b->A,b->mod,ctx)); 12555714Skris } 12655714Skris 12755714Skrisint BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) 12855714Skris { 12955714Skris int ret; 13055714Skris 13155714Skris bn_check_top(n); 13255714Skris if ((b->A == NULL) || (b->Ai == NULL)) 13355714Skris { 13455714Skris BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED); 13555714Skris return(0); 13655714Skris } 13755714Skris if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0) 13855714Skris { 13955714Skris if (!BN_BLINDING_update(b,ctx)) 14055714Skris return(0); 14155714Skris } 14255714Skris return(ret); 14355714Skris } 14455714Skris 145