Java tutorial
import java.security.Key; import java.security.PrivateKey; import java.security.PublicKey; public class XYZKey implements Key, PublicKey, PrivateKey { int rotValue; public String getAlgorithm() { return "XYZ"; } public String getFormat() { return "XYZ 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; } }