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Damien Miller686c7d92014-05-15 14:37:03 +10001/* $OpenBSD: chacha.h,v 1.3 2014/05/02 03:27:54 djm Exp $ */
Damien Miller0fde8ac2013-11-21 14:12:23 +11002
3/*
4chacha-merged.c version 20080118
5D. J. Bernstein
6Public domain.
7*/
8
9#ifndef CHACHA_H
10#define CHACHA_H
11
12#include <sys/types.h>
13
14struct chacha_ctx {
15 u_int input[16];
16};
17
18#define CHACHA_MINKEYLEN 16
19#define CHACHA_NONCELEN 8
20#define CHACHA_CTRLEN 8
21#define CHACHA_STATELEN (CHACHA_NONCELEN+CHACHA_CTRLEN)
22#define CHACHA_BLOCKLEN 64
23
24void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
Damien Miller686c7d92014-05-15 14:37:03 +100025 __attribute__((__bounded__(__minbytes__, 2, CHACHA_MINKEYLEN)));
Damien Miller0fde8ac2013-11-21 14:12:23 +110026void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr)
Damien Miller686c7d92014-05-15 14:37:03 +100027 __attribute__((__bounded__(__minbytes__, 2, CHACHA_NONCELEN)))
28 __attribute__((__bounded__(__minbytes__, 3, CHACHA_CTRLEN)));
Damien Miller0fde8ac2013-11-21 14:12:23 +110029void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
30 u_char *c, u_int bytes)
Damien Miller686c7d92014-05-15 14:37:03 +100031 __attribute__((__bounded__(__buffer__, 2, 4)))
32 __attribute__((__bounded__(__buffer__, 3, 4)));
Damien Miller0fde8ac2013-11-21 14:12:23 +110033
34#endif /* CHACHA_H */
35