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[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[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[XCHACHA20POLY1305_NONCE_SIZE],
31			       const u8 key[CHACHA20POLY1305_KEY_SIZE]);
32
33bool __must_check xchacha20poly1305_decrypt(
34	u8 *dst, const u8 *src, const size_t src_len, const u8 *ad,
35	const size_t ad_len, const u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
36	const u8 key[CHACHA20POLY1305_KEY_SIZE]);
37
38bool chacha20poly1305_encrypt_sg_inplace(struct scatterlist *src, size_t src_len,
39					 const u8 *ad, const size_t ad_len,
40					 const u64 nonce,
41					 const u8 key[CHACHA20POLY1305_KEY_SIZE]);
42
43bool chacha20poly1305_decrypt_sg_inplace(struct scatterlist *src, size_t src_len,
44					 const u8 *ad, const size_t ad_len,
45					 const u64 nonce,
46					 const u8 key[CHACHA20POLY1305_KEY_SIZE]);
47
48bool chacha20poly1305_selftest(void);
49
50#endif /* __CHACHA20POLY1305_H */