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 81BN_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); 100err: 101 if (ret != NULL) BN_BLINDING_free(ret); 102 return(NULL); 103 } 104 105void 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 115int 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; 129err: 130 return(ret); 131 } 132 133int 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 145int 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 } 162 163