xref: /openssh-portable/chacha.h (revision fa4a4c96)
1 /* $OpenBSD: chacha.h,v 1.4 2016/08/27 04:04:56 guenther Exp $ */
2 
3 /*
4 chacha-merged.c version 20080118
5 D. J. Bernstein
6 Public domain.
7 */
8 
9 #ifndef CHACHA_H
10 #define CHACHA_H
11 
12 #include <sys/types.h>
13 #include <stdlib.h>
14 
15 struct chacha_ctx {
16 	u_int input[16];
17 };
18 
19 #define CHACHA_MINKEYLEN 	16
20 #define CHACHA_NONCELEN		8
21 #define CHACHA_CTRLEN		8
22 #define CHACHA_STATELEN		(CHACHA_NONCELEN+CHACHA_CTRLEN)
23 #define CHACHA_BLOCKLEN		64
24 
25 void chacha_keysetup(struct chacha_ctx *x, const u_char *k, u_int kbits)
26     __attribute__((__bounded__(__minbytes__, 2, CHACHA_MINKEYLEN)));
27 void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv, const u_char *ctr)
28     __attribute__((__bounded__(__minbytes__, 2, CHACHA_NONCELEN)))
29     __attribute__((__bounded__(__minbytes__, 3, CHACHA_CTRLEN)));
30 void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
31     u_char *c, u_int bytes)
32     __attribute__((__bounded__(__buffer__, 2, 4)))
33     __attribute__((__bounded__(__buffer__, 3, 4)));
34 
35 #endif	/* CHACHA_H */
36 
37