Header Encryption.java

PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(Base64.decode(this.PrivateKey.getBytes(),0));
KeyFactory kf = KeyFactory.getInstance("RSA");
PrivateKey pk = kf.generatePrivate(spec);
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
cipher.init(Cipher.ENCRYPT_MODE, pk);

byte[] EncryptedStream = new byte[cipher.getOutputSize(dataToSign.length())];
try 
{
 cipher.doFinal(dataToSign.getBytes(),0,dataToSign.length(), EncryptedStream,0);
} 
catch (ShortBufferException e) 
{
 // TODO Auto-generated catch block
 e.printStackTrace();
}
return Base64.encodeToString(EncryptedStream, Base64.NO_WRAP);