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1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/*
3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4 */
5
6#ifndef __CHACHA20POLY1305_H
7#define __CHACHA20POLY1305_H
8
9#include <linux/types.h>
10#include <linux/scatterlist.h>
11
12enum chacha20poly1305_lengths {
13 XCHACHA20POLY1305_NONCE_SIZE = 24,
14 CHACHA20POLY1305_KEY_SIZE = 32,
15 CHACHA20POLY1305_AUTHTAG_SIZE = 16
16};
17
18void chacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
19 const u8 *ad, const size_t ad_len,
20 const u64 nonce,
21 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
22
23bool __must_check
24chacha20poly1305_decrypt(u8 *dst, const u8 *src, const size_t src_len,
25 const u8 *ad, const size_t ad_len, const u64 nonce,
26 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
27
28void xchacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
29 const u8 *ad, const size_t ad_len,
30 const u8 nonce[at_least XCHACHA20POLY1305_NONCE_SIZE],
31 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
32
33bool __must_check xchacha20poly1305_decrypt(
34 u8 *dst, const u8 *src, const size_t src_len,
35 const u8 *ad, const size_t ad_len,
36 const u8 nonce[at_least XCHACHA20POLY1305_NONCE_SIZE],
37 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
38
39bool chacha20poly1305_encrypt_sg_inplace(struct scatterlist *src, size_t src_len,
40 const u8 *ad, const size_t ad_len,
41 const u64 nonce,
42 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
43
44bool chacha20poly1305_decrypt_sg_inplace(struct scatterlist *src, size_t src_len,
45 const u8 *ad, const size_t ad_len,
46 const u64 nonce,
47 const u8 key[at_least CHACHA20POLY1305_KEY_SIZE]);
48
49bool chacha20poly1305_selftest(void);
50
51#endif /* __CHACHA20POLY1305_H */