Complete the following file:

import; import; import; import; import; /** This class encrypts files using the SuperCaesar cipher. */ public class SuperCaesarCipher { /** Constructs a cipher object with a given key. @param aKey the encryption key */ public SuperCaesarCipher(int aKey) { key = aKey; } /** Encrypts or decrypts the contents of a stream. @param in the input stream @param out the output stream @param decrypt true to decrypt, false to encrypt */ public void processStream(InputStream in, OutputStream out, boolean decrypt) throws IOException { boolean done = false; while (!done) { int next =; if (next == -1) done = true; else { byte b = (byte) next; byte c; if (decrypt) c = decrypt(b); else c = encrypt(b); out.write(c); } } } /** Encrypts a byte. @param b the byte to encrypt @return the encrypted byte */ public byte encrypt(byte b) { // your work here } /** Decrypts a byte. @param b the byte to decrypt @return the decrypted byte */ public byte decrypt(byte b) { // your work here } private int key; // this method is used to check your work public static String check(String input, int key, boolean decrypt) { try { InputStream inStream = new ByteArrayInputStream(input.getBytes()); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); SuperCaesarCipher cipher = new SuperCaesarCipher(key); cipher.processStream(inStream, outStream, decrypt); inStream.close(); outStream.close(); return outStream.toString(); } catch (IOException exception) { return "Error"; } } }