Java tutorial
import javax.crypto.SecretKey; public class XORKey implements SecretKey { int rotValue; XORKey(int value) { rotValue = value; } public String getAlgorithm() { return "XOR"; } public String getFormat() { return "XOR Special Format"; } public byte[] getEncoded() { byte b[] = new byte[4]; b[3] = (byte) ((rotValue << 24) & 0xff); b[2] = (byte) ((rotValue << 16) & 0xff); b[1] = (byte) ((rotValue << 8) & 0xff); b[0] = (byte) ((rotValue << 0) & 0xff); return b; } }