/* SPDX-License-Identifier: MIT
 *
 * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
 */

#ifndef _ZINC_CHACHA20POLY1305_H
#define _ZINC_CHACHA20POLY1305_H

#include <linux/simd.h>
#include <linux/types.h>

struct scatterlist;

enum chacha20poly1305_lengths {
	XCHACHA20POLY1305_NONCELEN = 24,
	CHACHA20POLY1305_KEYLEN = 32,
	CHACHA20POLY1305_AUTHTAGLEN = 16
};

void chacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
			      const u8 *ad, const size_t ad_len,
			      const u64 nonce,
			      const u8 key[CHACHA20POLY1305_KEYLEN]);

bool __must_check chacha20poly1305_encrypt_sg(
	struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
	const u8 *ad, const size_t ad_len, const u64 nonce,
	const u8 key[CHACHA20POLY1305_KEYLEN], simd_context_t simd_context);

bool __must_check
chacha20poly1305_decrypt(u8 *dst, const u8 *src, const size_t src_len,
			 const u8 *ad, const size_t ad_len, const u64 nonce,
			 const u8 key[CHACHA20POLY1305_KEYLEN]);

bool __must_check chacha20poly1305_decrypt_sg(
	struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
	const u8 *ad, const size_t ad_len, const u64 nonce,
	const u8 key[CHACHA20POLY1305_KEYLEN], simd_context_t simd_context);

void xchacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
			       const u8 *ad, const size_t ad_len,
			       const u8 nonce[XCHACHA20POLY1305_NONCELEN],
			       const u8 key[CHACHA20POLY1305_KEYLEN]);

bool __must_check xchacha20poly1305_decrypt(
	u8 *dst, const u8 *src, const size_t src_len, const u8 *ad,
	const size_t ad_len, const u8 nonce[XCHACHA20POLY1305_NONCELEN],
	const u8 key[CHACHA20POLY1305_KEYLEN]);

#ifdef DEBUG
bool chacha20poly1305_selftest(void);
#endif

#endif /* _ZINC_CHACHA20POLY1305_H */