public bool VerifyTimestampImprint() {
if (timeStampToken == null)
return false;
MessageImprint imprint = timeStampToken.TimeStampInfo.TstInfo.MessageImprint;
byte[] md = new System.Security.Cryptography.SHA1CryptoServiceProvider().ComputeHash(digest);
byte[] imphashed = imprint.GetHashedMessage();
bool res = Arrays.AreEqual(md, imphashed);
return res;
}