1/* crypto/ec/ec_lib.c */ 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 EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, 72 EC_POINT *point, const BIGNUM *x, 73 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, 78 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 79 return 0; 80 } 81 if (group->meth != point->meth) { 82 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, 83 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(group, point, x, 89 y_bit, ctx); 90 else 91#ifdef OPENSSL_NO_EC2M 92 { 93 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, 94 EC_R_GF2M_NOT_SUPPORTED); 95 return 0; 96 } 97#else 98 return ec_GF2m_simple_set_compressed_coordinates(group, point, x, 99 y_bit, ctx); 100#endif 101 } 102 return group->meth->point_set_compressed_coordinates(group, point, x, 103 y_bit, ctx); 104} 105 106#ifndef OPENSSL_NO_EC2M 107int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, 108 EC_POINT *point, const BIGNUM *x, 109 int y_bit, BN_CTX *ctx) 110{ 111 if (group->meth->point_set_compressed_coordinates == 0 112 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 113 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, 114 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 115 return 0; 116 } 117 if (group->meth != point->meth) { 118 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, 119 EC_R_INCOMPATIBLE_OBJECTS); 120 return 0; 121 } 122 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 123 if (group->meth->field_type == NID_X9_62_prime_field) 124 return ec_GFp_simple_set_compressed_coordinates(group, point, x, 125 y_bit, ctx); 126 else 127 return ec_GF2m_simple_set_compressed_coordinates(group, point, x, 128 y_bit, ctx); 129 } 130 return group->meth->point_set_compressed_coordinates(group, point, x, 131 y_bit, ctx); 132} 133#endif 134 135size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 136 point_conversion_form_t form, unsigned char *buf, 137 size_t len, BN_CTX *ctx) 138{ 139 if (group->meth->point2oct == 0 140 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 141 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 142 return 0; 143 } 144 if (group->meth != point->meth) { 145 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS); 146 return 0; 147 } 148 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 149 if (group->meth->field_type == NID_X9_62_prime_field) 150 return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx); 151 else 152#ifdef OPENSSL_NO_EC2M 153 { 154 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED); 155 return 0; 156 } 157#else 158 return ec_GF2m_simple_point2oct(group, point, 159 form, buf, len, ctx); 160#endif 161 } 162 163 return group->meth->point2oct(group, point, form, buf, len, ctx); 164} 165 166int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 167 const unsigned char *buf, size_t len, BN_CTX *ctx) 168{ 169 if (group->meth->oct2point == 0 170 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 171 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 172 return 0; 173 } 174 if (group->meth != point->meth) { 175 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS); 176 return 0; 177 } 178 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 179 if (group->meth->field_type == NID_X9_62_prime_field) 180 return ec_GFp_simple_oct2point(group, point, buf, len, ctx); 181 else 182#ifdef OPENSSL_NO_EC2M 183 { 184 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED); 185 return 0; 186 } 187#else 188 return ec_GF2m_simple_oct2point(group, point, buf, len, ctx); 189#endif 190 } 191 return group->meth->oct2point(group, point, buf, len, ctx); 192} 193