if (!isSigned())
if (!isSigned() || digests4entries == null)
	public String[] verifyContent() {		if (!isSigned())			return EMPTY_STRING;		ArrayList corrupted = new ArrayList(0); // be optimistic		for (Enumeration entries = digests4entries.keys(); entries.hasMoreElements();) {			String name = (String) entries.nextElement();			BundleEntry entry = getEntry(name);			if (entry == null)				corrupted.add(name); // we expected the entry to be here			else				try {					entry.getBytes();				} catch (IOException e) {					// must be invalid					corrupted.add(name);				}		}		return corrupted.size() == 0 ? EMPTY_STRING : (String[]) corrupted.toArray(new String[corrupted.size()]);	}