/* $OpenBSD: chacha.h,v 1.2 2014/03/26 04:55:35 djm Exp $ */

/*
chacha-merged.c version 20080118
D. J. Bernstein
Public domain.
*/

#ifndef CHACHA_H
#define CHACHA_H

#include <sys/types.h>

struct chacha_ctx {
	u_int input[16];
};

#define CHACHA_MINKEYLEN 	16
#define CHACHA_NONCELEN		8
#define CHACHA_CTRLEN		8
#define CHACHA_STATELEN		(CHACHA_NONCELEN+CHACHA_CTRLEN)
#define CHACHA_BLOCKLEN		64

void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
    __bounded((__minbytes__, 2, CHACHA_MINKEYLEN));
void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr)
    __bounded((__minbytes__, 2, CHACHA_NONCELEN))
    __bounded((__minbytes__, 3, CHACHA_CTRLEN));
void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
    u_char *c, u_int bytes)
    __bounded((__buffer__, 2, 4))
    __bounded((__buffer__, 3, 4));

#endif	/* CHACHA_H */