This file is indexed.

/usr/share/initramfs-tools/hooks/cryptkeyctl is in cryptsetup 2:1.4.1-2ubuntu4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

PREREQ="cryptroot"

prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/hook-functions

# Hooks for loading keyctl software into the initramfs

# Check whether cryptroot hook has installed decrypt_keyctl script 
if [ ! -x ${DESTDIR}/lib/cryptsetup/scripts/decrypt_keyctl ]; then
    exit 0
fi

# Install binaries into initramfs
copy_exec /bin/keyctl
copy_exec /bin/stty

exit 0