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)
75 extern "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. */
88 OPENSSL_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