BerDecoder bdec = new BerDecoder(inputBytes);
bdec.openSequence();
version = bdec.fetchInteger();
bdec.openSequence();
msgId = bdec.fetchInteger();
msgMaxSize = bdec.fetchInteger();
msgFlags = bdec.fetchOctetString()[0];
msgSecurityModel =bdec.fetchInteger();
bdec.closeSequence();
msgSecurityParameters = bdec.fetchOctetString();
if( (msgFlags & SnmpDefinitions.privMask) == 0 ) {