override public SecurityAssociation CheckForSecurityAssociation(ISender sender) {
int spi = SecurityPolicy.DefaultSPI;
lock(_sync) {
if(_spi.ContainsKey(spi)) {
var sender_to_sa = _spi[spi];
if(sender_to_sa.ContainsKey(sender)) {
return sender_to_sa[sender];
}
}
}
return null;
}