SecureChatClient/Add128.java at master · StevenMonty/SecureChatClient · GitHub

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importjava.util.Random;

/** TODO
 *
 * @author Steven Montalbano
 *
 */
publicclassAdd128implementsSymCipher {

privatebyte[] key;


publicAdd128() {

Randomr = newRandom();
this.key = newbyte[128];

r.nextBytes(key); //	Gernerate the key to be a random series of bits
	}

publicAdd128(byte[] key) {

if(key.length != 128)
thrownewIllegalArgumentException("Invalid key length of " + key.length + ", length must be 128.");

this.key = key.clone(); //	Clone the provided key
	}


@Override
publicbyte[] getKey() {
returnthis.key;
	}

@Override
publicbyte[] encode(StringS) {

System.out.println("Original String: " + S);

byte[] sBytes = S.getBytes();

System.out.println("Original String Bytes: ");
for(byteb: sBytes)
System.out.print(b + " ");
System.out.println();

//	Perform the encoding
for(inti = 0; i < sBytes.length; i++)
sBytes[i] = (byte) (sBytes[i] + key[i % key.length]);

System.out.println("Encrypted String Bytes: ");
for(byteb: sBytes)
System.out.print(b + " ");
System.out.println();

returnsBytes;
	}

@Override
publicStringdecode(byte[] bytes) {

System.out.println("Received Bytes: ");
for(byteb: bytes)
System.out.print(b + " ");
System.out.println();

//	Perform the decoding
for(inti = 0; i < bytes.length; i++)
bytes[i] = (byte) (bytes[i] - key[i % key.length]);

System.out.println("Decrypted Bytes: ");
for(byteb: bytes)
System.out.print(b + " ");
System.out.println();

Stringdecoded = newString(bytes);

System.out.println("Decrypted String: " + decoded);

returndecoded;
	}

}