libressl_d.openssl.curve25519 source code

1 /*	$OpenBSD: curve25519.h,v 1.3 2019/05/11 15:55:52 tb Exp $ */
2 /*
3  * Copyright (c) 2015, Google Inc.
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
12  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
14  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
15  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 /**
18  * Curve25519.
19  *
20  * Curve25519 is an elliptic curve.
21  *
22  * See_Also:
23  *      https://tools.ietf.org/html/rfc7748
24  */
25 module libressl_d.openssl.curve25519;
26 
27 
28 private static import core.stdc.stdint;
29 public import libressl_d.openssl.opensslconf;
30 
31 extern (C):
32 nothrow @nogc:
33 
34 /**
35  * X25519.
36  *
37  * X25519 is the Diffie-Hellman primitive built from curve25519. It is
38  * sometimes referred to as curve25519, but X25519 is a more precise name.
39  *
40  * See_Also:
41  *      http://cr.yp.to/ecdh.html
42  *      https://tools.ietf.org/html/rfc7748
43  */
44 enum X25519_KEY_LENGTH = 32;
45 
46 /**
47  * X25519_keypair sets |out_public_value| and |out_private_key| to a freshly
48  * generated, public/private key pair.
49  */
50 void X25519_keypair(core.stdc.stdint.uint8_t* out_public_value, core.stdc.stdint.uint8_t* out_private_key);
51 
52 /**
53  * X25519 writes a shared key to |out_shared_key| that is calculated from the
54  * given private key and the peer's public value. It returns one on success and
55  * zero on error.
56  *
57  * Don't use the shared key directly, rather use a KDF and also include the two
58  * public values as inputs.
59  */
60 int X25519(core.stdc.stdint.uint8_t* out_shared_key, const (core.stdc.stdint.uint8_t)* private_key, const (core.stdc.stdint.uint8_t)* peers_public_value);