1295367Sdes/* $OpenBSD: chacha.h,v 1.3 2014/05/02 03:27:54 djm Exp $ */
2261287Sdes
3261287Sdes/*
4261287Sdeschacha-merged.c version 20080118
5261287SdesD. J. Bernstein
6261287SdesPublic domain.
7261287Sdes*/
8261287Sdes
9261287Sdes#ifndef CHACHA_H
10261287Sdes#define CHACHA_H
11261287Sdes
12261287Sdes#include <sys/types.h>
13261287Sdes
14261287Sdesstruct chacha_ctx {
15261287Sdes	u_int input[16];
16261287Sdes};
17261287Sdes
18261287Sdes#define CHACHA_MINKEYLEN 	16
19261287Sdes#define CHACHA_NONCELEN		8
20261287Sdes#define CHACHA_CTRLEN		8
21261287Sdes#define CHACHA_STATELEN		(CHACHA_NONCELEN+CHACHA_CTRLEN)
22261287Sdes#define CHACHA_BLOCKLEN		64
23261287Sdes
24261287Sdesvoid chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
25261287Sdes    __attribute__((__bounded__(__minbytes__, 2, CHACHA_MINKEYLEN)));
26261287Sdesvoid chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr)
27261287Sdes    __attribute__((__bounded__(__minbytes__, 2, CHACHA_NONCELEN)))
28261287Sdes    __attribute__((__bounded__(__minbytes__, 3, CHACHA_CTRLEN)));
29261287Sdesvoid chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
30261287Sdes    u_char *c, u_int bytes)
31261287Sdes    __attribute__((__bounded__(__buffer__, 2, 4)))
32261287Sdes    __attribute__((__bounded__(__buffer__, 3, 4)));
33261287Sdes
34261287Sdes#endif	/* CHACHA_H */
35261287Sdes
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