/**
 * Basic encryption class using rotation.
 *
 * @version 1.0
 * @author  John Kloss
 */

public class Encrypt {

    /**
     * Modulus value which is set to the max value of an ASCII character
     * (one byte).
     */
    final static int MOD_VALUE = 256;


    int rotateValue;          // Amount to rotate forward a byte value


    /**
     * Creates a new Encrypt instance.
     *
     * @param value           The value to which this Encrypt's <code>
     *                        rotateValue</code> is set.
     */
    public Encrypt(int value) {
	rotateValue = value;
    }

    /**
     * Encrypts and returns a byte value.
     *
     * @param b               The byte value to encrypt.
     *
     * @return                The encrypted value of <code>b</code>
     */
    public int encrypt(int b) {
	return (int) (b + rotateValue) % MOD_VALUE;
    }
}