1656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* crypto/ec/ec_cvt.c */ 2656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* 3656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Originally written by Bodo Moeller for the OpenSSL project. 4656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 5656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* ==================================================================== 6656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. 7656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 8656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Redistribution and use in source and binary forms, with or without 9656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * modification, are permitted provided that the following conditions 10656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * are met: 11656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 12656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 1. Redistributions of source code must retain the above copyright 13656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer. 14656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 15656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 16656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * notice, this list of conditions and the following disclaimer in 17656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * the documentation and/or other materials provided with the 18656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * distribution. 19656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 20656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 3. All advertising materials mentioning features or use of this 21656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * software must display the following acknowledgment: 22656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 23656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 25656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * endorse or promote products derived from this software without 27656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * prior written permission. For written permission, please contact 28656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * openssl-core@openssl.org. 29656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 30656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 5. Products derived from this software may not be called "OpenSSL" 31656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * nor may "OpenSSL" appear in their names without prior written 32656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * permission of the OpenSSL Project. 33656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 34656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 6. Redistributions of any form whatsoever must retain the following 35656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * acknowledgment: 36656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * "This product includes software developed by the OpenSSL Project 37656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 39656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * OF THE POSSIBILITY OF SUCH DAMAGE. 51656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * ==================================================================== 52656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 53656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * This product includes cryptographic software written by Eric Young 54656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * (eay@cryptsoft.com). This product includes software written by Tim 55656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Hudson (tjh@cryptsoft.com). 56656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 57656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 58656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project/* ==================================================================== 59656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 61656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Portions of the attached software ("Contribution") are developed by 62656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 63656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 64656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The Contribution is licensed pursuant to the OpenSSL open source 65656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * license provided above. 66656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 67656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * The elliptic curve binary polynomial software is originally written by 68656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 69656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project * 70656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project */ 71656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 72656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include <openssl/err.h> 73656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project#include "ec_lcl.h" 74656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 75656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 76656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectEC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 77656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 78656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const EC_METHOD *meth; 79656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP *ret; 80656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 81392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#if defined(OPENSSL_BN_ASM_MONT) 82392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom /* 83392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * This might appear controversial, but the fact is that generic 84392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * prime method was observed to deliver better performance even 85392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * for NIST primes on a range of platforms, e.g.: 60%-15% 86392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * improvement on IA-64, ~25% on ARM, 30%-90% on P4, 20%-25% 87392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * in 32-bit build and 35%--12% in 64-bit build on Core2... 88392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * Coefficients are relative to optimized bn_nist.c for most 89392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * intensive ECDSA verify and ECDH operations for 192- and 521- 90392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * bit keys respectively. Choice of these boundary values is 91392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * arguable, because the dependency of improvement coefficient 92392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * from key length is not a "monotone" curve. For example while 93392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * 571-bit result is 23% on ARM, 384-bit one is -1%. But it's 94392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * generally faster, sometimes "respectfully" faster, sometimes 95392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * "tolerably" slower... What effectively happens is that loop 96392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * with bn_mul_add_words is put against bn_mul_mont, and the 97392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * latter "wins" on short vectors. Correct solution should be 98392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * implementing dedicated NxN multiplication subroutines for 99392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * small N. But till it materializes, let's stick to generic 100392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * prime method... 101392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom * <appro> 102392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom */ 103392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom meth = EC_GFp_mont_method(); 104392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#else 105656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project meth = EC_GFp_nist_method(); 106392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#endif 107656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 108656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = EC_GROUP_new(meth); 109656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 110656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 111656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 112656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx)) 113656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 114656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project unsigned long err; 115656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 116656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project err = ERR_peek_last_error(); 117656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 118656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!(ERR_GET_LIB(err) == ERR_LIB_EC && 119656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ((ERR_GET_REASON(err) == EC_R_NOT_A_NIST_PRIME) || 120656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project (ERR_GET_REASON(err) == EC_R_NOT_A_SUPPORTED_NIST_PRIME)))) 121656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 122656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* real error */ 123656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 124656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP_clear_free(ret); 125656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 126656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 127656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 128656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 129656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project /* not an actual error, we just cannot use EC_GFp_nist_method */ 130656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 131656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ERR_clear_error(); 132656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 133656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP_clear_free(ret); 134656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project meth = EC_GFp_mont_method(); 135656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 136656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = EC_GROUP_new(meth); 137656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 138656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 139656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 140656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx)) 141656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 142656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP_clear_free(ret); 143656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 144656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 145656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 146656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 147656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 148656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 149656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 150392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#ifndef OPENSSL_NO_EC2M 151656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source ProjectEC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 152656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 153656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project const EC_METHOD *meth; 154656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP *ret; 155656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 156656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project meth = EC_GF2m_simple_method(); 157656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 158656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project ret = EC_GROUP_new(meth); 159656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (ret == NULL) 160656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 161656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 162656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project if (!EC_GROUP_set_curve_GF2m(ret, p, a, b, ctx)) 163656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project { 164656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project EC_GROUP_clear_free(ret); 165656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return NULL; 166656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 167656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project 168656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project return ret; 169656d9c7f52f88b3a3daccafa7655dec086c4756eThe Android Open Source Project } 170392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#endif 171