crypto/ec/ec_cvt.c

   1 /* crypto/ec/ec_cvt.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55 /* ====================================================================
  56  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  57  *
  58  * Portions of the attached software ("Contribution") are developed by
  59  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
  60  *
  61  * The Contribution is licensed pursuant to the OpenSSL open source
  62  * license provided above.
  63  *
  64  * In addition, Sun covenants to all licensees who provide a reciprocal
  65  * covenant with respect to their own patents if any, not to sue under
  66  * current and future patent claims necessarily infringed by the making,
  67  * using, practicing, selling, offering for sale and/or otherwise
  68  * disposing of the Contribution as delivered hereunder
  69  * (or portions thereof), provided that such covenant shall not apply:
  70  *  1) for code that a licensee deletes from the Contribution;
  71  *  2) separates from the Contribution; or
  72  *  3) for infringements caused by:
  73  *       i) the modification of the Contribution or
  74  *      ii) the combination of the Contribution with other software or
  75  *          devices where such combination causes the infringement.
  76  *
  77  * The elliptic curve binary polynomial software is originally written by
  78  * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
  79  *
  80  */
  81
  82 #include "ec_lcl.h"
  83
  84
  85 EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
  86         {
  87         const EC_METHOD *meth;
  88         EC_GROUP *ret;
  89
  90         /* Finally, this will use EC_GFp_nist_method if 'p' is a special
  91          * prime with optimized modular arithmetics (for NIST curves)
  92          */
  93         meth = EC_GFp_mont_method();
  94
  95         ret = EC_GROUP_new(meth);
  96         if (ret == NULL)
  97                 return NULL;
  98
  99         if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx))
 100                 {
 101                 EC_GROUP_clear_free(ret);
 102                 return NULL;
 103                 }
 104
 105         return ret;
 106         }
 107
 108 EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 109         {
 110         const EC_METHOD *meth;
 111         EC_GROUP *ret;
 112
 113         meth = EC_GF2m_simple_method();
 114
 115         ret = EC_GROUP_new(meth);
 116         if (ret == NULL)
 117                 return NULL;
 118
 119         if (!EC_GROUP_set_curve_GF2m(ret, p, a, b, ctx))
 120                 {
 121                 EC_GROUP_clear_free(ret);
 122                 return NULL;
 123                 }
 124
 125         return ret;
 126         }