/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */

#ifndef CHACHA20POLY1305_H
#define CHACHA20POLY1305_H

#include <linux/types.h>

struct scatterlist;

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

void chacha20poly1305_init(void);

bool chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
			      const uint8_t *ad, const size_t ad_len,
			      const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);

bool chacha20poly1305_encrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
				 const uint8_t *ad, const size_t ad_len,
				 const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);

bool chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
			      const uint8_t *ad, const size_t ad_len,
			      const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);

bool chacha20poly1305_decrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
				 const uint8_t *ad, const size_t ad_len,
				 const uint64_t nonce, const uint8_t key[static CHACHA20POLY1305_KEYLEN]);

#ifdef DEBUG
bool chacha20poly1305_selftest(void);
#endif

#endif
