public class TrickCipher implements Cipher {
	
	private int max;
	private TinyCipher tc;
	
	public TrickCipher(int max, byte[] key) {
		if (max <= 0) throw new IllegalArgumentException("max must be positive: " + max);
		this.max = max;
		int numBits = BitTools.lb(max);
		tc = new TinyCipher(numBits, key);
	}
	
	public int encrypt(int x) {
		if (x >= max) throw new IllegalArgumentException("x must be less than max: " + x);
		do {
			x = tc.encrypt(x);
		} while(x >= max);
		return x;
	}
	
	public int decrypt(int x) {
		if (x >= max) throw new IllegalArgumentException("x must be less than max: " + x);
		do {
			x = tc.decrypt(x);
		} while(x >= max);
		return x;
	}
	
}