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/* $OpenBSD: chachapoly.h,v 1.4 2020/07/22 13:54:30 tobhe Exp $ */
/*
* Copyright (c) 2015 Mike Belopuhov
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _CHACHAPOLY_H_
#define _CHACHAPOLY_H_
#define CHACHA20_KEYSIZE 32
#define CHACHA20_CTR 4
#define CHACHA20_SALT 4
#define CHACHA20_NONCE 8
#define CHACHA20_BLOCK_LEN 64
struct chacha20_ctx {
uint8_t block[CHACHA20_BLOCK_LEN];
uint8_t nonce[CHACHA20_NONCE];
};
int chacha20_setkey(void *, u_int8_t *, int);
void chacha20_reinit(caddr_t, u_int8_t *);
void chacha20_crypt(caddr_t, u_int8_t *);
#define POLY1305_KEYLEN 32
#define POLY1305_TAGLEN 16
#define POLY1305_BLOCK_LEN 16
struct poly1305_ctx {
/* r, h, pad, leftover */
unsigned long state[5+5+4];
size_t leftover;
unsigned char buffer[POLY1305_BLOCK_LEN];
unsigned char final;
};
typedef struct {
uint8_t key[POLY1305_KEYLEN];
/* counter, salt */
uint8_t nonce[CHACHA20_NONCE];
struct chacha20_ctx chacha;
struct poly1305_ctx poly;
} CHACHA20_POLY1305_CTX;
void Chacha20_Poly1305_Init(void *);
void Chacha20_Poly1305_Setkey(void *, const uint8_t *, uint16_t);
void Chacha20_Poly1305_Reinit(void *, const uint8_t *, uint16_t);
int Chacha20_Poly1305_Update(void *, const uint8_t *, uint16_t);
void Chacha20_Poly1305_Final(uint8_t[POLY1305_TAGLEN], void *);
/* WireGuard crypto */
#define CHACHA20POLY1305_KEY_SIZE CHACHA20_KEYSIZE
#define CHACHA20POLY1305_AUTHTAG_SIZE POLY1305_TAGLEN
#define XCHACHA20POLY1305_NONCE_SIZE 24
void chacha20poly1305_encrypt(uint8_t *, const uint8_t *, const size_t,
const uint8_t *, const size_t, const uint64_t,
const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
int chacha20poly1305_decrypt(uint8_t *, const uint8_t *, const size_t,
const uint8_t *, const size_t, const uint64_t,
const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
void xchacha20poly1305_encrypt(uint8_t *, const uint8_t *, const size_t,
const uint8_t *, const size_t,
const uint8_t[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
int xchacha20poly1305_decrypt(uint8_t *, const uint8_t *, const size_t,
const uint8_t *, const size_t,
const uint8_t[XCHACHA20POLY1305_NONCE_SIZE],
const uint8_t[CHACHA20POLY1305_KEY_SIZE]);
#endif /* _CHACHAPOLY_H_ */
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