OpenWrt – Rev 3

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#!/bin/sh

log_urandom_seed() {
    echo "urandom-seed: $1" > /dev/kmsg
}

_do_urandom_seed() {
    [ -f "$1" ] || { log_urandom_seed "Seed file not found ($1)"; return; }
    [ -O "$1" -a -G "$1" -a ! -x "$1" ] || { log_urandom_seed "Wrong owner / permissions for $1"; return; }

    log_urandom_seed "Seeding with $1"
    cat "$1" > /dev/urandom
}

do_urandom_seed() {
    [ -c /dev/urandom ] || { log_urandom_seed "Something is wrong with /dev/urandom"; return; }

    _do_urandom_seed "/etc/urandom.seed"

    SEED="$(uci -q get system.@system[0].urandom_seed)"
    [ "${SEED:0:1}" == "/" -a "$SEED" != "/etc/urandom.seed" ] && _do_urandom_seed "$SEED"
}

boot_hook_add preinit_main do_urandom_seed