Recently my friend showed me the Japanese app on his iPhone, which would have been perfect for this. But unfortunately, you can't take phones into the exam either. So I'm looking for a electronic Japanese dictionary with similar features to the iPhone app: ideally, a recognition screen you can write kanji onto, or if that's not possible/too expensive, a table where you can select multiple radicals (similar to the one in the NJ Star word processor).
Does anyone have any recommendations? The web isn't being very useful, and the only other translators I know either just use computers or books.
Thanks in advance!