1/* ====================================================================
2 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
3 *
4 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
5 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
6 * to the OpenSSL project.
7 *
8 * The ECC Code is licensed pursuant to the OpenSSL open source
9 * license provided below.
10 *
11 * The ECDH software is originally written by Douglas Stebila of
12 * Sun Microsystems Laboratories.
13 *
14 */
15/* ====================================================================
16 * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 *
22 * 1. Redistributions of source code must retain the above copyright
23 *    notice, this list of conditions and the following disclaimer.
24 *
25 * 2. Redistributions in binary form must reproduce the above copyright
26 *    notice, this list of conditions and the following disclaimer in
27 *    the documentation and/or other materials provided with the
28 *    distribution.
29 *
30 * 3. All advertising materials mentioning features or use of this
31 *    software must display the following acknowledgment:
32 *    "This product includes software developed by the OpenSSL Project
33 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
34 *
35 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
36 *    endorse or promote products derived from this software without
37 *    prior written permission. For written permission, please contact
38 *    licensing@OpenSSL.org.
39 *
40 * 5. Products derived from this software may not be called "OpenSSL"
41 *    nor may "OpenSSL" appear in their names without prior written
42 *    permission of the OpenSSL Project.
43 *
44 * 6. Redistributions of any form whatsoever must retain the following
45 *    acknowledgment:
46 *    "This product includes software developed by the OpenSSL Project
47 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
50 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
53 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
56 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
58 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
59 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
60 * OF THE POSSIBILITY OF SUCH DAMAGE.
61 * ====================================================================
62 *
63 * This product includes cryptographic software written by Eric Young
64 * (eay@cryptsoft.com).  This product includes software written by Tim
65 * Hudson (tjh@cryptsoft.com). */
66
67#ifndef OPENSSL_HEADER_ECDH_H
68#define OPENSSL_HEADER_ECDH_H
69
70#include <openssl/base.h>
71
72#include <openssl/ec_key.h>
73
74#if defined(__cplusplus)
75extern "C" {
76#endif
77
78
79/* Elliptic curve Diffie-Hellman. */
80
81
82/* ECDH_compute_key calculates the shared key between |pub_key| and |priv_key|.
83 * If |kdf| is not NULL, then it is called with the bytes of the shared key and
84 * the parameter |out|. When |kdf| returns, the value of |*outlen| becomes the
85 * return value. Otherwise, as many bytes of the shared key as will fit are
86 * copied directly to, at most, |outlen| bytes at |out|. It returns the number
87 * of bytes written to |out|, or -1 on error. */
88OPENSSL_EXPORT int ECDH_compute_key(void *out, size_t outlen,
89                                    const EC_POINT *pub_key, EC_KEY *priv_key,
90                                    void *(*kdf)(const void *in, size_t inlen,
91                                                 void *out, size_t *outlen));
92
93
94#if defined(__cplusplus)
95}  /* extern C */
96#endif
97
98#define ECDH_R_KDF_FAILED 100
99#define ECDH_R_NO_PRIVATE_VALUE 101
100#define ECDH_R_POINT_ARITHMETIC_FAILURE 102
101
102#endif  /* OPENSSL_HEADER_ECDH_H */
103