3 /*-
4  * SPDX-License-Identifier: BSD-4-Clause
91 		rsp->rs_begin = rsp->rs_buf;  in rndtest_attach()
92 		rsp->rs_end = rsp->rs_buf + sizeof(rsp->rs_buf);  in rndtest_attach()
93 		rsp->rs_current = rsp->rs_begin;  in rndtest_attach()
94 		rsp->rs_discard = 1;  in rndtest_attach()
95 		rsp->rs_collect = 1;  in rndtest_attach()
96 		rsp->rs_parent = dev;  in rndtest_attach()
97 		callout_init(&rsp->rs_to, 1);  in rndtest_attach()
106 	callout_stop(&rsp->rs_to);  in rndtest_detach()
117 	if (rsp->rs_collect) {  in rndtest_harvest()
119 			*rsp->rs_current = ((u_char *) buf)[i];  in rndtest_harvest()
120 			if (++rsp->rs_current == rsp->rs_end) {  in rndtest_harvest()
122 				rsp->rs_current = rsp->rs_begin;  in rndtest_harvest()
128 				if (!rsp->rs_discard && rndtest_retest != 0) {  in rndtest_harvest()
129 					rsp->rs_collect = 0;  in rndtest_harvest()
130 					callout_reset(&rsp->rs_to,  in rndtest_harvest()
141 	if (rsp->rs_discard)  in rndtest_harvest()
156 	rsp->rs_discard = (rv != 0);  in rndtest_test()
172 	device_printf(rsp->rs_parent, "rndtest: %s\n", buf);  in rndtest_report()
185 		r = rsp->rs_buf[i];  in rndtest_monobit()
202 		return (-1);  in rndtest_monobit()
209 	u_int16_t min, max;  member
230 		c = rsp->rs_buf[i];  in rndtest_runs()
262 	len -= 1;  in rndtest_runs_record()
272 		if (src[i] < rndtest_runs_tab[i].min ||  in rndtest_runs_check()
275 			    "%s interval %d failed (%d, %d-%d)",  in rndtest_runs_check()
277 			    i + 1, src[i], rndtest_runs_tab[i].min,  in rndtest_runs_check()
279 			rv = -1;  in rndtest_runs_check()
284 			    i + 1, rndtest_runs_tab[i].min, src[i],  in rndtest_runs_check()
298 		c = rsp->rs_buf[i];  in rndtest_longruns()
322 		return (-1);  in rndtest_longruns()
327  * chi^2 test over 4 bits: (this is called the poker test in FIPS 140-2,
333 #define	RNDTEST_CHI4_K_MASK	(RNDTEST_CHI4_K - 1)
338  *	(V - 1562500) * (16 / 5000) = Vn   (where V is the unnormalized value)
346 	unsigned int freq[RNDTEST_CHI4_K], i, sum;  in rndtest_chi_4()  local
349 		freq[i] = 0;  in rndtest_chi_4()
353 		freq[(rsp->rs_buf[i] >> 4) & RNDTEST_CHI4_K_MASK]++;  in rndtest_chi_4()
354 		freq[(rsp->rs_buf[i] >> 0) & RNDTEST_CHI4_K_MASK]++;  in rndtest_chi_4()
358 		sum += freq[i] * freq[i];  in rndtest_chi_4()
366 		return (-1);  in rndtest_chi_4()
375 	rsp->rs_collect = 1;  in rndtest_timeout()