from luks import LuksFile
import sys

if len(sys.argv) < 4:
	print "Usage: delete.py <file> <existing password> <new password>"
	sys.exit(1)

f = open(sys.argv[1], "rb+")

luks = LuksFile()
luks.load_from_file(f)

luks.open_any_key(sys.argv[2])
luks.set_key(1, sys.argv[3], 4000)
luks.delete_key(0)
luks.close()