/* This file is in the public domain. */

#include <chacha.h>
#include <stdlib.h>

#include "algs.h"

typedef struct chachastate CHACHASTATE;

struct chachastate {
  CHACHA_STATE s;
  } ;

static void *enc_chacha_init(const void *key, const void *iv __attribute__((__unused__)))
{
 CHACHASTATE *s;

 s = malloc(sizeof(CHACHASTATE));
 if (s == 0) return(0);
 chacha_init(&s->s);
 chacha_setkey(&s->s,key);
 chacha_setcounter(&s->s,((const char *)key)+32);
 return(s);
}

static void enc_chacha_process(void *state, const void *in, void *out, int datalen)
{
 CHACHASTATE *s;

 s = state;
 chacha_crypt(&s->s,in,datalen,out);
}

static void enc_chacha_done(void *state)
{
 bzero(state,sizeof(CHACHASTATE));
 free(state);
}

ENCALG encalg_chacha
 = { "chacha@rodents.montreal.qc.ca",
     "ChaCha-20",
     1, 0, 48, 0,
     &enc_chacha_init,
     &enc_chacha_init,
     &enc_chacha_process,
     &enc_chacha_done };