text: /* crypto/ecdh/ecdh.h */
  /* ====================================================================
   * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
   *
   * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
   * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
   * to the OpenSSL project.
   *
   * The ECC Code is licensed pursuant to the OpenSSL open source
   * license provided below.
   *
   * The ECDH software is originally written by Douglas Stebila of
   * Sun Microsystems Laboratories.
   *
   */
  /* ====================================================================
   * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  #ifndef HEADER_ECDH_H
  # define HEADER_ECDH_H
  
  # include <openssl/opensslconf.h>
  
  # ifdef OPENSSL_NO_ECDH
  #  error ECDH is disabled.
  # endif
  
  # include <openssl/ec.h>
  # include <openssl/ossl_typ.h>
  # ifndef OPENSSL_NO_DEPRECATED
  #  include <openssl/bn.h>
  # endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  # define EC_FLAG_COFACTOR_ECDH   0x1000
  
  const ECDH_METHOD *ECDH_OpenSSL(void);
  
  void ECDH_set_default_method(const ECDH_METHOD *);
  const ECDH_METHOD *ECDH_get_default_method(void);
  int ECDH_set_method(EC_KEY *, const ECDH_METHOD *);
  
  int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
                       EC_KEY *ecdh, void *(*KDF) (const void *in, size_t inlen,
                                                   void *out, size_t *outlen));
  
  int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new
                            *new_func, CRYPTO_EX_dup *dup_func,
                            CRYPTO_EX_free *free_func);
  int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg);
  void *ECDH_get_ex_data(EC_KEY *d, int idx);
  
  int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
                     const unsigned char *Z, size_t Zlen,
                     const unsigned char *sinfo, size_t sinfolen,
                     const EVP_MD *md);
  
  /* BEGIN ERROR CODES */
  /*
   * The following lines are auto generated by the script mkerr.pl. Any changes
   * made after this point may be overwritten when the script is next run.
   */
  void ERR_load_ECDH_strings(void);
  
  /* Error codes for the ECDH functions. */
  
  /* Function codes. */
  # define ECDH_F_ECDH_CHECK                                102
  # define ECDH_F_ECDH_COMPUTE_KEY                          100
  # define ECDH_F_ECDH_DATA_NEW_METHOD                      101
  
  /* Reason codes. */
  # define ECDH_R_KDF_FAILED                                102
  # define ECDH_R_NON_FIPS_METHOD                           103
  # define ECDH_R_NO_PRIVATE_VALUE                          100
  # define ECDH_R_POINT_ARITHMETIC_FAILURE                  101
  
  #ifdef  __cplusplus
  }
  #endif
  #endif
  