ec_oct.c revision 1.5
1/* $OpenBSD: ec_oct.c,v 1.5 2017/01/29 17:49:23 beck Exp $ */ 2/* 3 * Originally written by Bodo Moeller for the OpenSSL project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * openssl-core@openssl.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58/* ==================================================================== 59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60 * Binary polynomial ECC support in OpenSSL originally developed by 61 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 62 */ 63 64#include <string.h> 65 66#include <openssl/opensslconf.h> 67 68#include <openssl/err.h> 69#include <openssl/opensslv.h> 70 71#include "ec_lcl.h" 72 73int 74EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP * group, EC_POINT * point, 75 const BIGNUM * x, int y_bit, BN_CTX * ctx) 76{ 77 if (group->meth->point_set_compressed_coordinates == 0 78 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 79 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 80 return 0; 81 } 82 if (group->meth != point->meth) { 83 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 84 return 0; 85 } 86 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 87 if (group->meth->field_type == NID_X9_62_prime_field) 88 return ec_GFp_simple_set_compressed_coordinates( 89 group, point, x, y_bit, ctx); 90 else 91#ifdef OPENSSL_NO_EC2M 92 { 93 ECerror(EC_R_GF2M_NOT_SUPPORTED); 94 return 0; 95 } 96#else 97 return ec_GF2m_simple_set_compressed_coordinates( 98 group, point, x, y_bit, ctx); 99#endif 100 } 101 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); 102} 103 104#ifndef OPENSSL_NO_EC2M 105int 106EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP * group, EC_POINT * point, 107 const BIGNUM * x, int y_bit, BN_CTX * ctx) 108{ 109 if (group->meth->point_set_compressed_coordinates == 0 110 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 111 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 112 return 0; 113 } 114 if (group->meth != point->meth) { 115 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 116 return 0; 117 } 118 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 119 if (group->meth->field_type == NID_X9_62_prime_field) 120 return ec_GFp_simple_set_compressed_coordinates( 121 group, point, x, y_bit, ctx); 122 else 123 return ec_GF2m_simple_set_compressed_coordinates( 124 group, point, x, y_bit, ctx); 125 } 126 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); 127} 128#endif 129 130size_t 131EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 132 point_conversion_form_t form, 133 unsigned char *buf, size_t len, BN_CTX *ctx) 134{ 135 if (group->meth->point2oct == 0 136 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 137 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 138 return 0; 139 } 140 if (group->meth != point->meth) { 141 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 142 return 0; 143 } 144 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 145 if (group->meth->field_type == NID_X9_62_prime_field) 146 return ec_GFp_simple_point2oct(group, point, 147 form, buf, len, ctx); 148 else 149#ifdef OPENSSL_NO_EC2M 150 { 151 ECerror(EC_R_GF2M_NOT_SUPPORTED); 152 return 0; 153 } 154#else 155 return ec_GF2m_simple_point2oct(group, point, 156 form, buf, len, ctx); 157#endif 158 } 159 return group->meth->point2oct(group, point, form, buf, len, ctx); 160} 161 162 163int 164EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 165 const unsigned char *buf, size_t len, BN_CTX *ctx) 166{ 167 if (group->meth->oct2point == 0 && 168 !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 169 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 170 return 0; 171 } 172 if (group->meth != point->meth) { 173 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 174 return 0; 175 } 176 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 177 if (group->meth->field_type == NID_X9_62_prime_field) 178 return ec_GFp_simple_oct2point(group, point, 179 buf, len, ctx); 180 else 181#ifdef OPENSSL_NO_EC2M 182 { 183 ECerror(EC_R_GF2M_NOT_SUPPORTED); 184 return 0; 185 } 186#else 187 return ec_GF2m_simple_oct2point(group, point, 188 buf, len, ctx); 189#endif 190 } 191 return group->meth->oct2point(group, point, buf, len, ctx); 192} 193