ec_oct.c revision 1.3
1/* $OpenBSD: ec_oct.c,v 1.3 2014/06/12 15:49:29 deraadt 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/err.h> 67#include <openssl/opensslv.h> 68 69#include "ec_lcl.h" 70 71int 72EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP * group, EC_POINT * point, 73 const BIGNUM * x, int y_bit, BN_CTX * ctx) 74{ 75 if (group->meth->point_set_compressed_coordinates == 0 76 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 77 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 78 return 0; 79 } 80 if (group->meth != point->meth) { 81 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 82 return 0; 83 } 84 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 85 if (group->meth->field_type == NID_X9_62_prime_field) 86 return ec_GFp_simple_set_compressed_coordinates( 87 group, point, x, y_bit, ctx); 88 else 89#ifdef OPENSSL_NO_EC2M 90 { 91 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_GF2M_NOT_SUPPORTED); 92 return 0; 93 } 94#else 95 return ec_GF2m_simple_set_compressed_coordinates( 96 group, point, x, y_bit, ctx); 97#endif 98 } 99 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); 100} 101 102#ifndef OPENSSL_NO_EC2M 103int 104EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP * group, EC_POINT * point, 105 const BIGNUM * x, int y_bit, BN_CTX * ctx) 106{ 107 if (group->meth->point_set_compressed_coordinates == 0 108 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 109 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 110 return 0; 111 } 112 if (group->meth != point->meth) { 113 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS); 114 return 0; 115 } 116 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 117 if (group->meth->field_type == NID_X9_62_prime_field) 118 return ec_GFp_simple_set_compressed_coordinates( 119 group, point, x, y_bit, ctx); 120 else 121 return ec_GF2m_simple_set_compressed_coordinates( 122 group, point, x, y_bit, ctx); 123 } 124 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); 125} 126#endif 127 128size_t 129EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 130 point_conversion_form_t form, 131 unsigned char *buf, size_t len, BN_CTX *ctx) 132{ 133 if (group->meth->point2oct == 0 134 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 135 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 136 return 0; 137 } 138 if (group->meth != point->meth) { 139 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS); 140 return 0; 141 } 142 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 143 if (group->meth->field_type == NID_X9_62_prime_field) 144 return ec_GFp_simple_point2oct(group, point, 145 form, buf, len, ctx); 146 else 147#ifdef OPENSSL_NO_EC2M 148 { 149 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED); 150 return 0; 151 } 152#else 153 return ec_GF2m_simple_point2oct(group, point, 154 form, buf, len, ctx); 155#endif 156 } 157 return group->meth->point2oct(group, point, form, buf, len, ctx); 158} 159 160 161int 162EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 163 const unsigned char *buf, size_t len, BN_CTX *ctx) 164{ 165 if (group->meth->oct2point == 0 && 166 !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 167 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 168 return 0; 169 } 170 if (group->meth != point->meth) { 171 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS); 172 return 0; 173 } 174 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 175 if (group->meth->field_type == NID_X9_62_prime_field) 176 return ec_GFp_simple_oct2point(group, point, 177 buf, len, ctx); 178 else 179#ifdef OPENSSL_NO_EC2M 180 { 181 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED); 182 return 0; 183 } 184#else 185 return ec_GF2m_simple_oct2point(group, point, 186 buf, len, ctx); 187#endif 188 } 189 return group->meth->oct2point(group, point, buf, len, ctx); 190} 191