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-rw-r--r--src/lib/libcrypto/curve25519/curve25519.h104
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diff --git a/src/lib/libcrypto/curve25519/curve25519.h b/src/lib/libcrypto/curve25519/curve25519.h
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1/* $OpenBSD: curve25519.h,v 1.7 2022/11/13 14:05:04 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#ifndef HEADER_CURVE25519_H
19#define HEADER_CURVE25519_H
20
21#include <stdint.h>
22
23#include <openssl/opensslconf.h>
24
25#if defined(__cplusplus)
26extern "C" {
27#endif
28
29/*
30 * Curve25519.
31 *
32 * Curve25519 is an elliptic curve. See https://tools.ietf.org/html/rfc7748.
33 */
34
35/*
36 * X25519.
37 *
38 * X25519 is the Diffie-Hellman primitive built from curve25519. It is
39 * sometimes referred to as curve25519, but X25519 is a more precise name.
40 * See http://cr.yp.to/ecdh.html and https://tools.ietf.org/html/rfc7748.
41 */
42
43#define X25519_KEY_LENGTH 32
44
45/*
46 * X25519_keypair sets |out_public_value| and |out_private_key| to a freshly
47 * generated, public/private key pair.
48 */
49void X25519_keypair(uint8_t out_public_value[X25519_KEY_LENGTH],
50 uint8_t out_private_key[X25519_KEY_LENGTH]);
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 */
60int X25519(uint8_t out_shared_key[X25519_KEY_LENGTH],
61 const uint8_t private_key[X25519_KEY_LENGTH],
62 const uint8_t peers_public_value[X25519_KEY_LENGTH]);
63
64/*
65 * ED25519
66 *
67 * Ed25519 is a signature scheme using a twisted Edwards curve that is
68 * birationally equivalent to curve25519.
69 */
70
71#define ED25519_PRIVATE_KEY_LENGTH 32
72#define ED25519_PUBLIC_KEY_LENGTH 32
73#define ED25519_SIGNATURE_LENGTH 64
74
75/*
76 * ED25519_keypair sets |out_public_key| and |out_private_key| to a freshly
77 * generated, public/private key pair.
78 */
79void ED25519_keypair(uint8_t out_public_key[ED25519_PUBLIC_KEY_LENGTH],
80 uint8_t out_private_key[ED25519_PRIVATE_KEY_LENGTH]);
81
82/*
83 * ED25519_sign sets |out_sig| to be a signature of |message_len| bytes from
84 * |message| using |public_key| and |private_key|. It returns one on success
85 * or zero on allocation failure.
86 */
87int ED25519_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
88 const uint8_t public_key[ED25519_PUBLIC_KEY_LENGTH],
89 const uint8_t private_key_seed[ED25519_PRIVATE_KEY_LENGTH]);
90
91/*
92 * ED25519_verify returns one iff |signature| is a valid signature by
93 * |public_key| of |message_len| bytes from |message|. It returns zero
94 * otherwise.
95 */
96int ED25519_verify(const uint8_t *message, size_t message_len,
97 const uint8_t signature[ED25519_SIGNATURE_LENGTH],
98 const uint8_t public_key[ED25519_PUBLIC_KEY_LENGTH]);
99
100#if defined(__cplusplus)
101} /* extern C */
102#endif
103
104#endif /* HEADER_CURVE25519_H */