/etc/default/rng-tools is in rng-tools 5-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | # Configuration for the rng-tools initscript
# $Id: rng-tools.default,v 1.1.2.5 2008-06-10 19:51:37 hmh Exp $
# This is a POSIX shell fragment
# Set to the input source for random data, leave undefined
# for the initscript to attempt auto-detection. Set to /dev/null
# for the viapadlock and tpm drivers.
#HRNGDEVICE=/dev/hwrng
#HRNGDEVICE=/dev/null
# Additional options to send to rngd. See the rngd(8) manpage for
# more information. Do not specify -r/--rng-device here, use
# HRNGDEVICE for that instead.
#RNGDOPTIONS="--hrng=intelfwh --fill-watermark=90% --feed-interval=1"
#RNGDOPTIONS="--hrng=viakernel --fill-watermark=90% --feed-interval=1"
#RNGDOPTIONS="--hrng=viapadlock --fill-watermark=90% --feed-interval=1"
#RNGDOPTIONS="--hrng=tpm --fill-watermark=90% --feed-interval=1"
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