1*0Sstevel@tonic-gate /* crypto/bn/bn_blind.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #include <stdio.h> 60*0Sstevel@tonic-gate #include "cryptlib.h" 61*0Sstevel@tonic-gate #include "bn_lcl.h" 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod) 64*0Sstevel@tonic-gate { 65*0Sstevel@tonic-gate BN_BLINDING *ret=NULL; 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate bn_check_top(Ai); 68*0Sstevel@tonic-gate bn_check_top(mod); 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate if ((ret=(BN_BLINDING *)OPENSSL_malloc(sizeof(BN_BLINDING))) == NULL) 71*0Sstevel@tonic-gate { 72*0Sstevel@tonic-gate BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE); 73*0Sstevel@tonic-gate return(NULL); 74*0Sstevel@tonic-gate } 75*0Sstevel@tonic-gate memset(ret,0,sizeof(BN_BLINDING)); 76*0Sstevel@tonic-gate if ((ret->A=BN_new()) == NULL) goto err; 77*0Sstevel@tonic-gate if ((ret->Ai=BN_new()) == NULL) goto err; 78*0Sstevel@tonic-gate if (!BN_copy(ret->A,A)) goto err; 79*0Sstevel@tonic-gate if (!BN_copy(ret->Ai,Ai)) goto err; 80*0Sstevel@tonic-gate ret->mod=mod; 81*0Sstevel@tonic-gate return(ret); 82*0Sstevel@tonic-gate err: 83*0Sstevel@tonic-gate if (ret != NULL) BN_BLINDING_free(ret); 84*0Sstevel@tonic-gate return(NULL); 85*0Sstevel@tonic-gate } 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate void BN_BLINDING_free(BN_BLINDING *r) 88*0Sstevel@tonic-gate { 89*0Sstevel@tonic-gate if(r == NULL) 90*0Sstevel@tonic-gate return; 91*0Sstevel@tonic-gate 92*0Sstevel@tonic-gate if (r->A != NULL) BN_free(r->A ); 93*0Sstevel@tonic-gate if (r->Ai != NULL) BN_free(r->Ai); 94*0Sstevel@tonic-gate OPENSSL_free(r); 95*0Sstevel@tonic-gate } 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) 98*0Sstevel@tonic-gate { 99*0Sstevel@tonic-gate int ret=0; 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate if ((b->A == NULL) || (b->Ai == NULL)) 102*0Sstevel@tonic-gate { 103*0Sstevel@tonic-gate BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED); 104*0Sstevel@tonic-gate goto err; 105*0Sstevel@tonic-gate } 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err; 108*0Sstevel@tonic-gate if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err; 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate ret=1; 111*0Sstevel@tonic-gate err: 112*0Sstevel@tonic-gate return(ret); 113*0Sstevel@tonic-gate } 114*0Sstevel@tonic-gate 115*0Sstevel@tonic-gate int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) 116*0Sstevel@tonic-gate { 117*0Sstevel@tonic-gate bn_check_top(n); 118*0Sstevel@tonic-gate 119*0Sstevel@tonic-gate if ((b->A == NULL) || (b->Ai == NULL)) 120*0Sstevel@tonic-gate { 121*0Sstevel@tonic-gate BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED); 122*0Sstevel@tonic-gate return(0); 123*0Sstevel@tonic-gate } 124*0Sstevel@tonic-gate return(BN_mod_mul(n,n,b->A,b->mod,ctx)); 125*0Sstevel@tonic-gate } 126*0Sstevel@tonic-gate 127*0Sstevel@tonic-gate int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) 128*0Sstevel@tonic-gate { 129*0Sstevel@tonic-gate int ret; 130*0Sstevel@tonic-gate 131*0Sstevel@tonic-gate bn_check_top(n); 132*0Sstevel@tonic-gate if ((b->A == NULL) || (b->Ai == NULL)) 133*0Sstevel@tonic-gate { 134*0Sstevel@tonic-gate BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED); 135*0Sstevel@tonic-gate return(0); 136*0Sstevel@tonic-gate } 137*0Sstevel@tonic-gate if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0) 138*0Sstevel@tonic-gate { 139*0Sstevel@tonic-gate if (!BN_BLINDING_update(b,ctx)) 140*0Sstevel@tonic-gate return(0); 141*0Sstevel@tonic-gate } 142*0Sstevel@tonic-gate return(ret); 143*0Sstevel@tonic-gate } 144*0Sstevel@tonic-gate 145