ec_oct.c revision 1.11
1/* $OpenBSD: ec_oct.c,v 1.11 2023/04/11 18:58:20 jsing 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_local.h" 72 73int 74EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point, 75 const BIGNUM *x, int y_bit, BN_CTX *ctx_in) 76{ 77 BN_CTX *ctx; 78 int ret = 0; 79 80 if ((ctx = ctx_in) == NULL) 81 ctx = BN_CTX_new(); 82 if (ctx == NULL) 83 goto err; 84 85 if (group->meth->point_set_compressed_coordinates == NULL) { 86 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 87 goto err; 88 } 89 if (group->meth != point->meth) { 90 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 91 goto err; 92 } 93 ret = group->meth->point_set_compressed_coordinates(group, point, 94 x, y_bit, ctx); 95 96 err: 97 if (ctx != ctx_in) 98 BN_CTX_free(ctx); 99 100 return ret; 101} 102 103int 104EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, 105 const BIGNUM *x, int y_bit, BN_CTX *ctx) 106{ 107 return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx); 108} 109 110#ifndef OPENSSL_NO_EC2M 111int 112EC_POINT_set_compressed_coordinates_GF2m(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#endif 118 119size_t 120EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 121 point_conversion_form_t form, unsigned char *buf, size_t len, 122 BN_CTX *ctx_in) 123{ 124 BN_CTX *ctx; 125 int ret = 0; 126 127 if ((ctx = ctx_in) == NULL) 128 ctx = BN_CTX_new(); 129 if (ctx == NULL) 130 goto err; 131 132 if (group->meth->point2oct == NULL) { 133 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 134 goto err; 135 } 136 if (group->meth != point->meth) { 137 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 138 goto err; 139 } 140 ret = group->meth->point2oct(group, point, form, buf, len, ctx); 141 142 err: 143 if (ctx != ctx_in) 144 BN_CTX_free(ctx); 145 146 return ret; 147} 148 149int 150EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 151 const unsigned char *buf, size_t len, BN_CTX *ctx_in) 152{ 153 BN_CTX *ctx; 154 int ret = 0; 155 156 if ((ctx = ctx_in) == NULL) 157 ctx = BN_CTX_new(); 158 if (ctx == NULL) 159 goto err; 160 161 if (group->meth->oct2point == NULL) { 162 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 163 goto err; 164 } 165 if (group->meth != point->meth) { 166 ECerror(EC_R_INCOMPATIBLE_OBJECTS); 167 goto err; 168 } 169 ret = group->meth->oct2point(group, point, buf, len, ctx); 170 171 err: 172 if (ctx != ctx_in) 173 BN_CTX_free(ctx); 174 175 return ret; 176} 177