return null;
}
private String md5Hash(byte input[]){
//update the input of MD5
MD5Digest md5 = new MD5Digest();
md5.update(input, 0, input.length);
//get the output/ digest size and hash it
byte[] digest = new byte[md5.getDigestSize()];
md5.doFinal(digest, 0);
return new String(Hex.encode(digest));
}