bool unit_test_chacha20(){
int a;
bool pass = true;
uint8_t ciphertext[114];
memset(ciphertext, 0, 114 * sizeof ciphertext[0]);
uint32_t counter = (uint32_t )1;
chacha20(ciphertext,chacha_plaintext,114, chacha_key, chacha_nonce, counter);
a = memcmp(ciphertext, chacha_ciphertext, 114 * sizeof (uint8_t));
if (a != 0){
pass = false;
printf("Chacha20 failed on RFC test of size 114\n.");
}
return pass;
}
// set best knock win/chan/start/stop
mote_t mote_knock(mote_t m, knock_t k, uint64_t from)
{
uint8_t pad[8];
uint8_t nonce[8];
uint64_t offset, start, stop;
uint32_t win, lwin;
epoch_t e;
medium_t medium;
if(!m || !k || !k->com) return LOG("bad args");
k->epoch = NULL;
k->mote = m;
medium = k->com->medium;
// get the best one
for(e=m->epochs;e;e=e->next)
{
// normalize nonce
memset(nonce,0,8);
switch(e->type)
{
case PING:
win = 0;
e->base = from; // is always now
break;
case ECHO:
win = 1;
break;
case PAIR:
case LINK:
win = ((from - e->base) / EPOCH_WINDOW);
break;
default :
continue;
}
if(!e->base) continue;
lwin = util_sys_long(win);
memset(nonce,0,8);
memcpy(nonce,&lwin,4);
// ciphertext the pad
memset(pad,0,8);
chacha20(e->secret,nonce,pad,8);
offset = util_sys_long((unsigned long)(pad[2])) % (EPOCH_WINDOW - medium->min);
start = e->base + (EPOCH_WINDOW*win) + offset;
stop = start + medium->min;
if(!k->epoch || stop < k->stop)
{
// rx never trumps tx
if(k->epoch && k->epoch->dir == TX && e->dir == RX) continue;
k->epoch = e;
k->win = win;
k->chan = util_sys_short((unsigned short)(pad[0])) % medium->chans;
k->start = start;
k->stop = stop;
}
}
return m;
}
