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