1 /* ====================================================================
2 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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.
8 * The ECC Code is licensed pursuant to the OpenSSL open source
9 * license provided below.
11 * The ECDH software is originally written by Douglas Stebila of
12 * Sun Microsystems Laboratories.
15 /* ====================================================================
16 * Copyright (c) 2000-2002 The OpenSSL Project. All rights reserved.
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
44 * 6. Redistributions of any form whatsoever must retain the following
46 * "This product includes software developed by the OpenSSL Project
47 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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). */
67 #ifndef OPENSSL_HEADER_ECDH_H
68 #define OPENSSL_HEADER_ECDH_H
70 #include <openssl/base.h>
72 #include <openssl/ec_key.h>
74 #if defined(__cplusplus)
79 // Elliptic curve Diffie-Hellman.
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(
89 void *out, size_t outlen, const EC_POINT *pub_key, const EC_KEY *priv_key,
90 void *(*kdf)(const void *in, size_t inlen, void *out, size_t *outlen));
93 #if defined(__cplusplus)
97 #define ECDH_R_KDF_FAILED 100
98 #define ECDH_R_NO_PRIVATE_VALUE 101
99 #define ECDH_R_POINT_ARITHMETIC_FAILURE 102
101 #endif // OPENSSL_HEADER_ECDH_H