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class SignSealUtility<E,V> implements Serializable {
  final static long serialVersionUID = 2648720192864531932L;
  private HashMap<E,V> ssnMap;
  private SealedObject sealedSsnMap;
  private SignedObject signedSsnMap;
  
  public SignSealUtility() {
    ssnMap = new HashMap<E,V>();
  }

  public void seal(Cipher cipher) throws Exception {
    sealedSsnMap = new SealedObject(ssnMap, cipher);
    // Now set the Map to null so that original data does not remain in cleartext
    ssnMap = null; 
  }

  public void unseal(Cipher cipher) throws Exception {
    ssnMap = (HashMap<E,V>)sealedSsnMap.getObject(cipher);
  }
  
  public void sign(Signature sig, PrivateKey key) throws Exception {
    signedSsnMap = new SignedObject(ssnMap, key, sig);
    ssnMap = null;
  }

  public void unsign(Signature sig, PublicKey key) throws Exception {
    if(signedSsnMap.verify(key, sig)) {
      ssnMap = (HashMap<E,V>)signedSsnMap.getObject();
    }
  }

  public Object getdata(ObjectE key) throws Exception {
    return ssnMap.get(key);
  }
 
  public void setData(E key, V data) throws Exception {
    ssnMap.put(key, data);
  }
}