/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ /* 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 *)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); 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); }