ec_cvt.c revision 296465
199730Sbenno/* crypto/ec/ec_cvt.c */ 299730Sbenno/* 399730Sbenno * Originally written by Bodo Moeller for the OpenSSL project. 499730Sbenno */ 599730Sbenno/* ==================================================================== 699730Sbenno * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. 799730Sbenno * 8104435Sgrehan * Redistribution and use in source and binary forms, with or without 9132069Sgrehan * modification, are permitted provided that the following conditions 10132069Sgrehan * are met: 11132069Sgrehan * 12132069Sgrehan * 1. Redistributions of source code must retain the above copyright 13132069Sgrehan * notice, this list of conditions and the following disclaimer. 14132069Sgrehan * 15132069Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 1699730Sbenno * notice, this list of conditions and the following disclaimer in 17132069Sgrehan * the documentation and/or other materials provided with the 18132069Sgrehan * distribution. 1999730Sbenno * 20132069Sgrehan * 3. All advertising materials mentioning features or use of this 21132069Sgrehan * software must display the following acknowledgment: 22132069Sgrehan * "This product includes software developed by the OpenSSL Project 2399730Sbenno * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 2499730Sbenno * 2599730Sbenno * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 2699730Sbenno * endorse or promote products derived from this software without 2799730Sbenno * prior written permission. For written permission, please contact 2899730Sbenno * openssl-core@openssl.org. 2999730Sbenno * 3099730Sbenno * 5. Products derived from this software may not be called "OpenSSL" 3199730Sbenno * nor may "OpenSSL" appear in their names without prior written 32132069Sgrehan * permission of the OpenSSL Project. 3399730Sbenno * 34132069Sgrehan * 6. Redistributions of any form whatsoever must retain the following 35132069Sgrehan * acknowledgment: 36132069Sgrehan * "This product includes software developed by the OpenSSL Project 37132069Sgrehan * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 3899730Sbenno * 39132069Sgrehan * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40132069Sgrehan * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41132069Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42132069Sgrehan * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 4399730Sbenno * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44132069Sgrehan * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45132069Sgrehan * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46132069Sgrehan * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47132069Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48132069Sgrehan * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49132069Sgrehan * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50132069Sgrehan * OF THE POSSIBILITY OF SUCH DAMAGE. 5199730Sbenno * ==================================================================== 52132069Sgrehan * 53132069Sgrehan * This product includes cryptographic software written by Eric Young 5499730Sbenno * (eay@cryptsoft.com). This product includes software written by Tim 5599730Sbenno * Hudson (tjh@cryptsoft.com). 56132069Sgrehan * 57132069Sgrehan */ 5899730Sbenno/* ==================================================================== 59132069Sgrehan * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60132069Sgrehan * 61132069Sgrehan * Portions of the attached software ("Contribution") are developed by 62132069Sgrehan * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 6399730Sbenno * 64132069Sgrehan * The Contribution is licensed pursuant to the OpenSSL open source 65132069Sgrehan * license provided above. 66132069Sgrehan * 67132069Sgrehan * The elliptic curve binary polynomial software is originally written by 6899730Sbenno * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 69132069Sgrehan * 70132069Sgrehan */ 71132069Sgrehan 72132069Sgrehan#include <openssl/err.h> 73132069Sgrehan#include "ec_lcl.h" 74132069Sgrehan 75132069SgrehanEC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, 7699730Sbenno const BIGNUM *b, BN_CTX *ctx) 77132069Sgrehan{ 78132069Sgrehan const EC_METHOD *meth; 7999730Sbenno EC_GROUP *ret; 8099730Sbenno 81132069Sgrehan meth = EC_GFp_nist_method(); 82132069Sgrehan 8399730Sbenno ret = EC_GROUP_new(meth); 8499730Sbenno if (ret == NULL) 8599730Sbenno return NULL; 86132069Sgrehan 87132069Sgrehan if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx)) { 88132069Sgrehan unsigned long err; 89132069Sgrehan 9099730Sbenno err = ERR_peek_last_error(); 91132069Sgrehan 9299730Sbenno if (!(ERR_GET_LIB(err) == ERR_LIB_EC && 9399730Sbenno ((ERR_GET_REASON(err) == EC_R_NOT_A_NIST_PRIME) || 94132069Sgrehan (ERR_GET_REASON(err) == EC_R_NOT_A_SUPPORTED_NIST_PRIME)))) { 9599730Sbenno /* real error */ 96132069Sgrehan 9799730Sbenno EC_GROUP_clear_free(ret); 98 return NULL; 99 } 100 101 /* 102 * not an actual error, we just cannot use EC_GFp_nist_method 103 */ 104 105 ERR_clear_error(); 106 107 EC_GROUP_clear_free(ret); 108 meth = EC_GFp_mont_method(); 109 110 ret = EC_GROUP_new(meth); 111 if (ret == NULL) 112 return NULL; 113 114 if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx)) { 115 EC_GROUP_clear_free(ret); 116 return NULL; 117 } 118 } 119 120 return ret; 121} 122 123EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, 124 const BIGNUM *b, BN_CTX *ctx) 125{ 126 const EC_METHOD *meth; 127 EC_GROUP *ret; 128 129 meth = EC_GF2m_simple_method(); 130 131 ret = EC_GROUP_new(meth); 132 if (ret == NULL) 133 return NULL; 134 135 if (!EC_GROUP_set_curve_GF2m(ret, p, a, b, ctx)) { 136 EC_GROUP_clear_free(ret); 137 return NULL; 138 } 139 140 return ret; 141} 142