1 /* $OpenBSD: ec_oct.c,v 1.8 2021/04/20 17:34:33 tb 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 73 int 74 EC_POINT_set_compressed_coordinates(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 == NULL && 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 if (!group->meth->point_set_compressed_coordinates(group, point, x, 102 y_bit, ctx)) 103 return 0; 104 if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { 105 ECerror(EC_R_POINT_IS_NOT_ON_CURVE); 106 return 0; 107 } 108 return 1; 109 } 110 111 int 112 EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, 113 const BIGNUM *x, int y_bit, BN_CTX *ctx) 114 { 115 return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx); 116 } 117 118 #ifndef OPENSSL_NO_EC2M 119 int 120 EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point, 121 const BIGNUM *x, int y_bit, BN_CTX *ctx) 122 { 123 return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx); 124 } 125 #endif 126 127 size_t 128 EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 129 point_conversion_form_t form, 130 unsigned char *buf, size_t len, BN_CTX *ctx) 131 { 132 if (group->meth->point2oct == 0 133 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 134 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 135 return 0; 136 } 137 if (group->meth != point->meth) { 138 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 139 return 0; 140 } 141 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 142 if (group->meth->field_type == NID_X9_62_prime_field) 143 return ec_GFp_simple_point2oct(group, point, 144 form, buf, len, ctx); 145 else 146 #ifdef OPENSSL_NO_EC2M 147 { 148 ECerror(EC_R_GF2M_NOT_SUPPORTED); 149 return 0; 150 } 151 #else 152 return ec_GF2m_simple_point2oct(group, point, 153 form, buf, len, ctx); 154 #endif 155 } 156 return group->meth->point2oct(group, point, form, buf, len, ctx); 157 } 158 159 int 160 EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 161 const unsigned char *buf, size_t len, BN_CTX *ctx) 162 { 163 if (group->meth->oct2point == 0 && 164 !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) { 165 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 166 return 0; 167 } 168 if (group->meth != point->meth) { 169 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 170 return 0; 171 } 172 if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) { 173 if (group->meth->field_type == NID_X9_62_prime_field) 174 return ec_GFp_simple_oct2point(group, point, 175 buf, len, ctx); 176 else 177 #ifdef OPENSSL_NO_EC2M 178 { 179 ECerror(EC_R_GF2M_NOT_SUPPORTED); 180 return 0; 181 } 182 #else 183 return ec_GF2m_simple_oct2point(group, point, 184 buf, len, ctx); 185 #endif 186 } 187 return group->meth->oct2point(group, point, buf, len, ctx); 188 } 189