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#include "os.h"
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#include <libsec.h>
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static void
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init(Chachastate *cs)
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{
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	ulong seed[11];
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	int i;
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	for(i=0; i<nelem(seed); i++)
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		seed[i] = truerand();
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	setupChachastate(cs, (uchar*)&seed[0], 32, (uchar*)&seed[8], 12, 20);
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	memset(seed, 0, sizeof(seed));
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}
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static void
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fill(Chachastate *cs, uchar *p, int n)
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{
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	Chachastate c;
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	c = *cs;
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	chacha_encrypt((uchar*)&cs->input[4], 32, &c);
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	if(++cs->input[13] == 0)
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		if(++cs->input[14] == 0)
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			++cs->input[15];
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	chacha_encrypt(p, n, &c);
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	memset(&c, 0, sizeof(c));
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}
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void
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genrandom(uchar *p, int n)
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{
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	static QLock lk;
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	static Chachastate cs;
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	qlock(&lk);
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	if(cs.rounds == 0)
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		init(&cs);
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	cs.input[4] ^= getpid();	/* fork protection */
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	fill(&cs, p, n);
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	qunlock(&lk);
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}