private void ReadTimestamp(XmlDictionaryReader reader)
{
if (_timestamp != null)
{
throw TraceUtility.ThrowHelperError(new MessageSecurityException(SR.DuplicateTimestampInSecurityHeader), Message);
}
bool expectTimestampToBeSigned = RequireMessageProtection || _hasEndorsingOrSignedEndorsingSupportingTokens;
string expectedDigestAlgorithm = expectTimestampToBeSigned ? AlgorithmSuite.DefaultDigestAlgorithm : null;
SignatureResourcePool resourcePool = expectTimestampToBeSigned ? ResourcePool : null;
_timestamp = StandardsManager.WSUtilitySpecificationVersion.ReadTimestamp(reader, expectedDigestAlgorithm, resourcePool);
_timestamp.ValidateRangeAndFreshness(_replayWindow, _clockSkew);
ElementManager.AppendTimestamp(_timestamp);
}