*/
public boolean verifyTimestampImprint() throws NoSuchAlgorithmException {
if (timeStampToken == null)
return false;
TimeStampTokenInfo info = timeStampToken.getTimeStampInfo();
MessageImprint imprint = info.toTSTInfo().getMessageImprint();
String algOID = info.getMessageImprintAlgOID();
byte[] md = MessageDigest.getInstance(algOID).digest(digest);
byte[] imphashed = imprint.getHashedMessage();
boolean res = Arrays.equals(md, imphashed);
return res;
}