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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 71 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point, 72 const BIGNUM *x, int y_bit, BN_CTX *ctx) 73 { 74 if (group->meth->point_set_compressed_coordinates == 0 75 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) 76 { 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 { 82 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS); 83 return 0; 84 } 85 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT) 86 { 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 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, 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 105 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point, 106 const BIGNUM *x, int y_bit, BN_CTX *ctx) 107 { 108 if (group->meth->point_set_compressed_coordinates == 0 109 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) 110 { 111 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 112 return 0; 113 } 114 if (group->meth != point->meth) 115 { 116 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS); 117 return 0; 118 } 119 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT) 120 { 121 if (group->meth->field_type == NID_X9_62_prime_field) 122 return ec_GFp_simple_set_compressed_coordinates( 123 group, point, x, y_bit, ctx); 124 else 125 return ec_GF2m_simple_set_compressed_coordinates( 126 group, point, x, y_bit, ctx); 127 } 128 return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx); 129 } 130 #endif 131 132 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, 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 { 138 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 139 return 0; 140 } 141 if (group->meth != point->meth) 142 { 143 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS); 144 return 0; 145 } 146 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT) 147 { 148 if (group->meth->field_type == NID_X9_62_prime_field) 149 return ec_GFp_simple_point2oct(group, point, 150 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 } 165 166 167 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point, 168 const unsigned char *buf, size_t len, BN_CTX *ctx) 169 { 170 if (group->meth->oct2point == 0 171 && !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) 172 { 173 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 174 return 0; 175 } 176 if (group->meth != point->meth) 177 { 178 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS); 179 return 0; 180 } 181 if(group->meth->flags & EC_FLAGS_DEFAULT_OCT) 182 { 183 if (group->meth->field_type == NID_X9_62_prime_field) 184 return ec_GFp_simple_oct2point(group, point, 185 buf, len, ctx); 186 else 187 #ifdef OPENSSL_NO_EC2M 188 { 189 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED); 190 return 0; 191 } 192 #else 193 return ec_GF2m_simple_oct2point(group, point, 194 buf, len, ctx); 195 #endif 196 } 197 return group->meth->oct2point(group, point, buf, len, ctx); 198 } 199 200
