D22878.diff
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	Index: head/sys/dev/random/hash.c
	===================================================================
	--- head/sys/dev/random/hash.c
	+++ head/sys/dev/random/hash.c
	@@ -68,18 +68,18 @@
	_Static_assert(CHACHA_STATELEN == RANDOM_BLOCKSIZE, "");

	/*
	- * Experimental Chacha20-based PRF for Fortuna keystream primitive. For now,
	- * disabled by default. But we may enable it in the future.
	+ * Knob to control use of Chacha20-based PRF for Fortuna keystream primitive.
	*
	* Benefits include somewhat faster keystream generation compared with
	- * unaccelerated AES-ICM.
	+ * unaccelerated AES-ICM; reseeding is much cheaper than computing AES key
	+ * schedules.
	*/
	-bool random_chachamode __read_frequently = false;
	+bool random_chachamode __read_frequently = true;
	#ifdef _KERNEL
	SYSCTL_BOOL(_kern_random, OID_AUTO, use_chacha20_cipher, CTLFLAG_RDTUN,
	&random_chachamode, 0,
	- "If non-zero, use the ChaCha20 cipher for randomdev PRF. "
	- "If zero, use AES-ICM cipher for randomdev PRF (default).");
	+ "If non-zero, use the ChaCha20 cipher for randomdev PRF (default). "
	+ "If zero, use AES-ICM cipher for randomdev PRF (12.x default).");
	#endif

	/* Initialise the hash */