crypto/openssh/chacha.h

   1 /* $OpenBSD: chacha.h,v 1.5 2021/04/03 05:54:14 djm 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