android-raptor – Rev 2

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#!/bin/sh
#
# urandom       This script saves the random seed between reboots.
#               It is called from the boot, halt and reboot scripts.
#
# Version:      @(#)urandom  1.33  22-Jun-1998  miquels@cistron.nl
#

[ -c /dev/urandom ] || exit 0
#. /etc/default/rcS

case "$1" in
        start|"")
                # check for read only file system
                if ! touch /etc/random-seed 2>/dev/null
                then
                        echo "read-only file system detected...done"
                        exit
                fi
                if [ "$VERBOSE" != no ]
                then
                        printf "Initializing random number generator... "
                fi
                # Load and then save 512 bytes,
                # which is the size of the entropy pool
                cat /etc/random-seed >/dev/urandom
                rm -f /etc/random-seed
                umask 077
                dd if=/dev/urandom of=/etc/random-seed count=1 \
                        >/dev/null 2>&1 || echo "urandom start: failed."
                umask 022
                [ "$VERBOSE" != no ] && echo "done."
                ;;
        stop)
                if ! touch /etc/random-seed 2>/dev/null
                then
                        exit
                fi
                # Carry a random seed from shut-down to start-up;
                # see documentation in linux/drivers/char/random.c
                [ "$VERBOSE" != no ] && printf "Saving random seed... "
                umask 077
                dd if=/dev/urandom of=/etc/random-seed count=1 \
                        >/dev/null 2>&1 || echo "urandom stop: failed."
                [ "$VERBOSE" != no ] && echo "done."
                ;;
        *)
                echo "Usage: urandom {start|stop}" >&2
                exit 1
                ;;
esac