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      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