1 /*        $NetBSD: chacha.h,v 1.3 2021/04/19 14:40:15 christos Exp $  */
2 /* $OpenBSD: chacha.h,v 1.5 2021/04/03 05:54:14 djm Exp $ */
3 
4 /*
5 chacha-merged.c version 20080118
6 D. J. Bernstein
7 Public domain.
8 */
9 
10 #ifndef CHACHA_H
11 #define CHACHA_H
12 
13 #include <sys/types.h>
14 #include <stdlib.h>
15 
16 struct chacha_ctx {
17           u_int input[16];
18 };
19 
20 #define CHACHA_MINKEYLEN      16
21 #define CHACHA_NONCELEN                 8
22 #define CHACHA_CTRLEN                   8
23 #define CHACHA_STATELEN                 (CHACHA_NONCELEN+CHACHA_CTRLEN)
24 #define CHACHA_BLOCKLEN                 64
25 
26 void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
27     __attribute__((__bounded__(__minbytes__, 2, CHACHA_MINKEYLEN)));
28 void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr)
29     __attribute__((__bounded__(__minbytes__, 2, CHACHA_NONCELEN)))
30     __attribute__((__bounded__(__minbytes__, 3, CHACHA_CTRLEN)));
31 void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
32     u_char *c, u_int bytes)
33     __attribute__((__bounded__(__buffer__, 2, 4)))
34     __attribute__((__bounded__(__buffer__, 3, 4)));
35 
36 #endif    /* CHACHA_H */
37 
38