/**
* Change the authorization protocol being used to receive messages on the connection. This
* routine must be called when the RecvThread is synchronized with the Vat thread. This assertion
* is checked by setting myChangeProtocolIsOk just before calling into the Vat with a new incoming
* message and resetting it when the call returns. This routine will throw an Assertion failure if
* that boolean is not true.
*
* @param protocolParms is the parameter bundle for the protocol suite to use. This routine must,
* of course, support the selected suite.
*/
void changeProtocol(AuthSecrets protocolParms) {
if (Trace.comm.verbose && Trace.ON) {
Trace.comm.verbosem("ProtocolChange, pp=" + protocolParms);
}
T.require(
myChangeProtocolIsOk,
"Must only be called while caller " + "is processing an input message");
// For calculating the header length
int headerLengthIndex = HEADER_INVALID;
if (StartUpProtocol.PROTO_NONE.equals(protocolParms.myProtocolSuite)) {
myIsAggragating = false;
myIsDoingMac = false;
mySequence = null;
headerLengthIndex = HEADER_INT_LENGTH;
// begin daffE -> E
} else if (StartUpProtocol.PROTO_3DES_SDH_M.equals(protocolParms.myProtocolSuite)) {
myIsAggragating = true;
MessageDigest md5 = setSHA1(protocolParms);
headerLengthIndex = HEADER_VLEN_SHA1;
mySequence = null;
byte[] raw_3des_key = TripleDESKeyConstructor.make(protocolParms.myDHSecret);
myTransform = new Decrypt3DES(raw_3des_key, protocolParms.myIncomingSequence);
// end daffE -> E
// begin improved E protocol
} else if (StartUpProtocol.PROTO_3DES_SDH_M2.equals(protocolParms.myProtocolSuite)) {
myIsAggragating = true;
MessageDigest md5 = setSHA1(protocolParms);
headerLengthIndex = HEADER_VLEN_HMAC;
mySequence = new byte[4]; // Assume initialized to zero
byte[] raw_3des_key = TripleDESKeyConstructor.make(protocolParms.myDHSecret);
myTransform = new Decrypt3DES(raw_3des_key, protocolParms.myIncomingSequence);
myTransform.init();
myIsStandardCBC = true;
myIsDoingHMAC = true;
// end improved E protocol
} else {
T.fail("Invalid protocol type " + protocolParms);
}
myIsCompressingMsgLengths = myIsAggragating;
int len = theHeaderLengths[headerLengthIndex];
T.require(0 <= len, "Invalid header length code");
myHeader = new byte[len];
}
