ObsoleteFiles.inc:

  Remove manual pages for arc4random_addrandom(3) and
  arc4random_stir(3).

contrib/ntp/lib/isc/random.c:
contrib/ntp/sntp/libevent/evutil_rand.c:

  Eliminate in-tree usage of arc4random_addrandom().

crypto/heimdal/lib/roken/rand.c:
crypto/openssh/config.h:

  Eliminate in-tree usage of arc4random_stir().

include/stdlib.h:

  Remove arc4random_stir() and arc4random_addrandom() prototypes,
  provide temporary shims for transistion period.

lib/libc/gen/Makefile.inc:

  Hook arc4random-compat.c to build, add hint for Chacha20 source for
  kernel, and remove arc4random_addrandom(3) and arc4random_stir(3)
  links.

lib/libc/gen/arc4random.c:

  Adopt OpenBSD arc4random.c,v 1.54 with bare minimum changes, use the
  sys/crypto/chacha20 implementation of keystream.

lib/libc/gen/Symbol.map:

  Remove arc4random_stir and arc4random_addrandom interfaces.

lib/libc/gen/arc4random.h:

  Adopt OpenBSD arc4random.h,v 1.4 but provide _ARC4_LOCK of our own.

lib/libc/gen/arc4random.3:

  Adopt OpenBSD arc4random.3,v 1.35 but keep FreeBSD r114444 and
  r118247.

lib/libc/gen/arc4random-compat.c:

  Compatibility shims for arc4random_stir and arc4random_addrandom
  functions to preserve ABI.  Log once when called but do nothing
  otherwise.

lib/libc/gen/getentropy.c:
lib/libc/include/libc_private.h:

  Fold __arc4_sysctl into getentropy.c (renamed to arnd_sysctl).
  Remove from libc_private.h as a result.

sys/crypto/chacha20/chacha.c:
sys/crypto/chacha20/chacha.h:

  Make it possible to use the kernel implementation in libc.