1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* crypto/bn/bn_mont.c */ 2656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * All rights reserved. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This package is an SSL implementation written 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * by Eric Young (eay@cryptsoft.com). 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The implementation was written so as to conform with Netscapes SSL. 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This library is free for commercial and non-commercial use as long as 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the following conditions are aheared to. The following conditions 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * apply to all code found in this distribution, be it the RC4, RSA, 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * included with this distribution is covered by the same copyright terms 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright remains Eric Young's, and as such any Copyright notices in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the code are not to be removed. 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * If this package is used in a product, Eric Young should be given attribution 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * as the author of the parts of the library used. 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This can be in the form of a textual message at program startup or 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * in documentation (online or textual) provided with the package. 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the copyright 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in the 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * documentation and/or other materials provided with the distribution. 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this software 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * must display the following acknowledgement: 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes cryptographic software written by 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Eric Young (eay@cryptsoft.com)" 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The word 'cryptographic' can be left out if the rouines from the library 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * being used are not cryptographic related :-). 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. If you include any Windows specific code (or a derivative thereof) from 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the apps directory (application code) you must include an acknowledgement: 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SUCH DAMAGE. 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The licence and distribution terms for any publically available version or 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * derivative of this code cannot be changed. i.e. this code cannot simply be 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * copied and put under another distribution licence 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * [including the GNU Public Licence.] 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* ==================================================================== 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 63656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 64656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 65656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the above copyright 66656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 67656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the documentation and/or other materials provided with the 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * distribution. 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * software must display the following acknowledgment: 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * endorse or promote products derived from this software without 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * prior written permission. For written permission, please contact 81656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * openssl-core@openssl.org. 82656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 83656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5. Products derived from this software may not be called "OpenSSL" 84656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * nor may "OpenSSL" appear in their names without prior written 85656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * permission of the OpenSSL Project. 86656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 87656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 6. Redistributions of any form whatsoever must retain the following 88656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * acknowledgment: 89656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 90656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 92656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OF THE POSSIBILITY OF SUCH DAMAGE. 104656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ==================================================================== 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 106656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This product includes cryptographic software written by Eric Young 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * (eay@cryptsoft.com). This product includes software written by Tim 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Hudson (tjh@cryptsoft.com). 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* 113656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Details about Montgomery multiplication algorithms can be found at 114656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * http://security.ece.orst.edu/publications.html, e.g. 115656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * http://security.ece.orst.edu/koc/papers/j37acmon.pdf and 116656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * sections 3.8 and 4.2 in http://security.ece.orst.edu/koc/papers/r01rsasw.pdf 117656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 118656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <stdio.h> 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "cryptlib.h" 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "bn_lcl.h" 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#define MONT_WORD /* use the faster word-based algorithm */ 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 125221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#ifdef MONT_WORD 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont); 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectint BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_MONT_CTX *mont, BN_CTX *ctx) 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *tmp; 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int ret=0; 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD) 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int num = mont->N.top; 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (num>1 && a->top==num && b->top==num) 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 139656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (bn_wexpand(r,num) == NULL) return(0); 140656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,mont->n0,num)) 141656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 142656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project r->neg = a->neg^b->neg; 143656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project r->top = num; 144656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_correct_top(r); 145656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(1); 146656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 147656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 148656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 149656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 150656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_start(ctx); 151656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project tmp = BN_CTX_get(ctx); 152656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (tmp == NULL) goto err; 153656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 154656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_check_top(tmp); 155656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (a == b) 156656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 157656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_sqr(tmp,a,ctx)) goto err; 158656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 159656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 160656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 161656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_mul(tmp,a,b,ctx)) goto err; 162656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 163656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* reduce from aRR to aR */ 164221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#ifdef MONT_WORD 165656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_from_montgomery_word(r,tmp,mont)) goto err; 166656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 167656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err; 168656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 169656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_check_top(r); 170656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret=1; 171656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projecterr: 172656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_end(ctx); 173656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(ret); 174656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 175656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 176221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#ifdef MONT_WORD 177656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectstatic int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont) 178656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 179656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *n; 180392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom BN_ULONG *ap,*np,*rp,n0,v,carry; 181392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom int nl,max,i; 182656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 183656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project n= &(mont->N); 184656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project nl=n->top; 185392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom if (nl == 0) { ret->top=0; return(1); } 186656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 187392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom max=(2*nl); /* carry is stored separately */ 188656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (bn_wexpand(r,max) == NULL) return(0); 189656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 190656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project r->neg^=n->neg; 191656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project np=n->d; 192656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp=r->d; 193656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 194656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* clear the top words of T */ 195221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if 1 196656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project for (i=r->top; i<max; i++) /* memset? XXX */ 197392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom rp[i]=0; 198221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#else 199392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom memset(&(rp[r->top]),0,(max-r->top)*sizeof(BN_ULONG)); 200221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 201656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 202656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project r->top=max; 203656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project n0=mont->n0[0]; 204656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 205656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifdef BN_COUNT 206656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project fprintf(stderr,"word BN_from_montgomery_word %d * %d\n",nl,nl); 207656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 208392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom for (carry=0, i=0; i<nl; i++, rp++) 209656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 210656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifdef __TANDEM 211656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 212656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project long long t1; 213656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project long long t2; 214656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project long long t3; 215656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t1 = rp[0] * (n0 & 0177777); 216656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t2 = 037777600000l; 217656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t2 = n0 & t2; 218656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t3 = rp[0] & 0177777; 219656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t2 = (t3 * t2) & BN_MASK2; 220656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t1 = t1 + t2; 221656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1); 222656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 223656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 224656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2); 225656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 226392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom v = (v+carry+rp[nl])&BN_MASK2; 227392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom carry |= (v != rp[nl]); 228392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom carry &= (v <= rp[nl]); 229392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom rp[nl]=v; 230656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 231656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 232392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom if (bn_wexpand(ret,nl) == NULL) return(0); 233392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom ret->top=nl; 234656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret->neg=r->neg; 235656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 236656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp=ret->d; 237392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom ap=&(r->d[nl]); 238656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 239392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#define BRANCH_FREE 1 240392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#if BRANCH_FREE 241656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 242392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom BN_ULONG *nrp; 243392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom size_t m; 244656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 245392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom v=bn_sub_words(rp,ap,np,nl)-carry; 246392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom /* if subtraction result is real, then 247656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * trick unconditional memcpy below to perform in-place 248656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "refresh" instead of actual copy. */ 249392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom m=(0-(size_t)v); 250392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom nrp=(BN_ULONG *)(((PTR_SIZE_INT)rp&~m)|((PTR_SIZE_INT)ap&m)); 251656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 252392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom for (i=0,nl-=4; i<nl; i+=4) 253656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 254656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_ULONG t1,t2,t3,t4; 255656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 256656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t1=nrp[i+0]; 257656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t2=nrp[i+1]; 258656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t3=nrp[i+2]; ap[i+0]=0; 259656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t4=nrp[i+3]; ap[i+1]=0; 260656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp[i+0]=t1; ap[i+2]=0; 261656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp[i+1]=t2; ap[i+3]=0; 262656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp[i+2]=t3; 263656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp[i+3]=t4; 264656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 265392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom for (nl+=4; i<nl; i++) 266656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project rp[i]=nrp[i], ap[i]=0; 267392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom } 268656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 269392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom if (bn_sub_words (rp,ap,np,nl)-carry) 270392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom memcpy(rp,ap,nl*sizeof(BN_ULONG)); 271221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 272392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom bn_correct_top(r); 273392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom bn_correct_top(ret); 274221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom bn_check_top(ret); 275221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 276221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom return(1); 277221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 278221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif /* MONT_WORD */ 279221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 280221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromint BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont, 281221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BN_CTX *ctx) 282221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 283221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int retn=0; 284221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#ifdef MONT_WORD 285221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BIGNUM *t; 286221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 287221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BN_CTX_start(ctx); 288221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if ((t = BN_CTX_get(ctx)) && BN_copy(t,a)) 289221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom retn = BN_from_montgomery_word(ret,t,mont); 290221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BN_CTX_end(ctx); 291221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#else /* !MONT_WORD */ 292656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *t1,*t2; 293656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 294656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_start(ctx); 295656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t1 = BN_CTX_get(ctx); 296656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project t2 = BN_CTX_get(ctx); 297656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (t1 == NULL || t2 == NULL) goto err; 298656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 299656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_copy(t1,a)) goto err; 300656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_mask_bits(t1,mont->ri); 301656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 302656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_mul(t2,t1,&mont->Ni,ctx)) goto err; 303656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_mask_bits(t2,mont->ri); 304656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 305656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_mul(t1,t2,&mont->N,ctx)) goto err; 306656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_add(t2,a,t1)) goto err; 307656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_rshift(ret,t2,mont->ri)) goto err; 308656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 309656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (BN_ucmp(ret, &(mont->N)) >= 0) 310656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 311656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_usub(ret,ret,&(mont->N))) goto err; 312656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 313656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project retn=1; 314656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project bn_check_top(ret); 315656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project err: 316656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_end(ctx); 317221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif /* MONT_WORD */ 318656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(retn); 319656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 320656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 321656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectBN_MONT_CTX *BN_MONT_CTX_new(void) 322656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 323656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_MONT_CTX *ret; 324656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 325656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((ret=(BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL) 326656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(NULL); 327656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 328656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_MONT_CTX_init(ret); 329656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret->flags=BN_FLG_MALLOCED; 330656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(ret); 331656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 332656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 333656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectvoid BN_MONT_CTX_init(BN_MONT_CTX *ctx) 334656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 335656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ctx->ri=0; 336656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_init(&(ctx->RR)); 337656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_init(&(ctx->N)); 338656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_init(&(ctx->Ni)); 339656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ctx->n0[0] = ctx->n0[1] = 0; 340656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ctx->flags=0; 341656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 342656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 343656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectvoid BN_MONT_CTX_free(BN_MONT_CTX *mont) 344656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 345656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if(mont == NULL) 346656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return; 347656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 348656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_free(&(mont->RR)); 349656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_free(&(mont->N)); 350656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_free(&(mont->Ni)); 351656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (mont->flags & BN_FLG_MALLOCED) 352656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project OPENSSL_free(mont); 353656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 354656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 355656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projectint BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx) 356656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 357656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project int ret = 0; 358656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM *Ri,*R; 359656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 360656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_start(ctx); 361656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if((Ri = BN_CTX_get(ctx)) == NULL) goto err; 362656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project R= &(mont->RR); /* grab RR as a temp */ 363656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_copy(&(mont->N),mod)) goto err; /* Set N */ 364656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->N.neg = 0; 365656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 366656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#ifdef MONT_WORD 367656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 368656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BIGNUM tmod; 369656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_ULONG buf[2]; 370656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 371656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_init(&tmod); 372656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project tmod.d=buf; 373656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project tmod.dmax=2; 374656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project tmod.neg=0; 375656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 376221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2; 377221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 378221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32) 379221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* Only certain BN_BITS2<=32 platforms actually make use of 380221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * n0[1], and we could use the #else case (with a shorter R 381221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * value) for the others. However, currently only the assembler 382221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * files do know which is which. */ 383221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 384221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BN_zero(R); 385221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (!(BN_set_bit(R,2*BN_BITS2))) goto err; 386221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 387656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project tmod.top=0; 388656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((buf[0] = mod->d[0])) tmod.top=1; 389656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((buf[1] = mod->top>1 ? mod->d[1] : 0)) tmod.top=2; 390656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 391656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL) 392656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 393656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_lshift(Ri,Ri,2*BN_BITS2)) goto err; /* R*Ri */ 394656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_is_zero(Ri)) 395656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 396656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_sub_word(Ri,1)) goto err; 397656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 398656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else /* if N mod word size == 1 */ 399656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 400656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (bn_expand(Ri,(int)sizeof(BN_ULONG)*2) == NULL) 401656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 402656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ri-- (mod double word size) */ 403656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project Ri->neg=0; 404656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project Ri->d[0]=BN_MASK2; 405656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project Ri->d[1]=BN_MASK2; 406656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project Ri->top=2; 407656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 408656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err; 409656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ni = (R*Ri-1)/N, 410656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * keep only couple of least significant words: */ 411656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0; 412656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0; 413656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else 414221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom BN_zero(R); 415221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (!(BN_set_bit(R,BN_BITS2))) goto err; /* R */ 416221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 417221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom buf[0]=mod->d[0]; /* tmod = N mod word size */ 418221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom buf[1]=0; 419221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom tmod.top = buf[0] != 0 ? 1 : 0; 420656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ri = R^-1 mod N*/ 421656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL) 422656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 423656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_lshift(Ri,Ri,BN_BITS2)) goto err; /* R*Ri */ 424656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_is_zero(Ri)) 425656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 426656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_sub_word(Ri,1)) goto err; 427656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 428656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else /* if N mod word size == 1 */ 429656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 430656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_set_word(Ri,BN_MASK2)) goto err; /* Ri-- (mod word size) */ 431656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 432656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err; 433656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ni = (R*Ri-1)/N, 434656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * keep only least significant word: */ 435656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0; 436656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->n0[1] = 0; 437656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 438656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 439656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#else /* !MONT_WORD */ 440656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { /* bignum version */ 441656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project mont->ri=BN_num_bits(&mont->N); 442656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_zero(R); 443656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_set_bit(R,mont->ri)) goto err; /* R = 2^ri */ 444656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ri = R^-1 mod N*/ 445656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if ((BN_mod_inverse(Ri,R,&mont->N,ctx)) == NULL) 446656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project goto err; 447656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_lshift(Ri,Ri,mont->ri)) goto err; /* R*Ri */ 448656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_sub_word(Ri,1)) goto err; 449656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* Ni = (R*Ri-1) / N */ 450656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_div(&(mont->Ni),NULL,Ri,&mont->N,ctx)) goto err; 451656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 452656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#endif 453656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 454656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* setup RR for conversions */ 455656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_zero(&(mont->RR)); 456656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_set_bit(&(mont->RR),mont->ri*2)) goto err; 457656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_mod(&(mont->RR),&(mont->RR),&(mont->N),ctx)) goto err; 458656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 459656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = 1; 460656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Projecterr: 461656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_CTX_end(ctx); 462656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 463656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 464656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 465656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectBN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from) 466656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 467656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (to == from) return(to); 468656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 469656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_copy(&(to->RR),&(from->RR))) return NULL; 470656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_copy(&(to->N),&(from->N))) return NULL; 471656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!BN_copy(&(to->Ni),&(from->Ni))) return NULL; 472656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project to->ri=from->ri; 473656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project to->n0[0]=from->n0[0]; 474656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project to->n0[1]=from->n0[1]; 475656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return(to); 476656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 477656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 478656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectBN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock, 479656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const BIGNUM *mod, BN_CTX *ctx) 480656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 481656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project BN_MONT_CTX *ret; 482656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 483656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project CRYPTO_r_lock(lock); 48477c6be7176c48d2ce4d5979a84876d34204eedafKenny Root ret = *pmont; 48577c6be7176c48d2ce4d5979a84876d34204eedafKenny Root CRYPTO_r_unlock(lock); 48677c6be7176c48d2ce4d5979a84876d34204eedafKenny Root if (ret) 48777c6be7176c48d2ce4d5979a84876d34204eedafKenny Root return ret; 48877c6be7176c48d2ce4d5979a84876d34204eedafKenny Root 48977c6be7176c48d2ce4d5979a84876d34204eedafKenny Root /* We don't want to serialise globally while doing our lazy-init math in 49077c6be7176c48d2ce4d5979a84876d34204eedafKenny Root * BN_MONT_CTX_set. That punishes threads that are doing independent 49177c6be7176c48d2ce4d5979a84876d34204eedafKenny Root * things. Instead, punish the case where more than one thread tries to 49277c6be7176c48d2ce4d5979a84876d34204eedafKenny Root * lazy-init the same 'pmont', by having each do the lazy-init math work 49377c6be7176c48d2ce4d5979a84876d34204eedafKenny Root * independently and only use the one from the thread that wins the race 49477c6be7176c48d2ce4d5979a84876d34204eedafKenny Root * (the losers throw away the work they've done). */ 49577c6be7176c48d2ce4d5979a84876d34204eedafKenny Root ret = BN_MONT_CTX_new(); 49677c6be7176c48d2ce4d5979a84876d34204eedafKenny Root if (!ret) 49777c6be7176c48d2ce4d5979a84876d34204eedafKenny Root return NULL; 49877c6be7176c48d2ce4d5979a84876d34204eedafKenny Root if (!BN_MONT_CTX_set(ret, mod, ctx)) 499656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 50077c6be7176c48d2ce4d5979a84876d34204eedafKenny Root BN_MONT_CTX_free(ret); 50177c6be7176c48d2ce4d5979a84876d34204eedafKenny Root return NULL; 50277c6be7176c48d2ce4d5979a84876d34204eedafKenny Root } 503656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 50477c6be7176c48d2ce4d5979a84876d34204eedafKenny Root /* The locked compare-and-set, after the local work is done. */ 50577c6be7176c48d2ce4d5979a84876d34204eedafKenny Root CRYPTO_w_lock(lock); 50677c6be7176c48d2ce4d5979a84876d34204eedafKenny Root if (*pmont) 50777c6be7176c48d2ce4d5979a84876d34204eedafKenny Root { 50877c6be7176c48d2ce4d5979a84876d34204eedafKenny Root BN_MONT_CTX_free(ret); 50977c6be7176c48d2ce4d5979a84876d34204eedafKenny Root ret = *pmont; 510656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 511656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project else 51277c6be7176c48d2ce4d5979a84876d34204eedafKenny Root *pmont = ret; 51377c6be7176c48d2ce4d5979a84876d34204eedafKenny Root CRYPTO_w_unlock(lock); 514656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 515656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 516