CryptoModule.cc

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00001 //
00002 // Copyright (C) 2009 Institut fuer Telematik, Universitaet Karlsruhe (TH)
00003 //
00004 // This program is free software; you can redistribute it and/or
00005 // modify it under the terms of the GNU General Public License
00006 // as published by the Free Software Foundation; either version 2
00007 // of the License, or (at your option) any later version.
00008 //
00009 // This program is distributed in the hope that it will be useful,
00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 // GNU General Public License for more details.
00013 //
00014 // You should have received a copy of the GNU General Public License
00015 // along with this program; if not, write to the Free Software
00016 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017 //
00018 
00025 #include <CommonMessages_m.h>
00026 #include <OverlayAccess.h>
00027 #include <GlobalStatisticsAccess.h>
00028 #include <CryptoModule.h>
00029 
00030 using namespace std;
00031 
00032 Define_Module(CryptoModule);
00033 
00034 CryptoModule::CryptoModule()
00035 {
00036     globalStatistics = NULL;
00037     overlay = NULL;
00038 }
00039 
00040 CryptoModule::~CryptoModule()
00041 {
00042 }
00043 
00044 void CryptoModule::initialize()
00045 {
00046     globalStatistics = GlobalStatisticsAccess().get();
00047     overlay = OverlayAccess().get(this);
00048 
00049     numSign = 0;
00050 
00051 //    EV << "[CryptoModule::initialize() @ " << overlay->getThisNode().getAddress()
00052 //       << " (" << overlay->getThisNode().getKey().toString(16) << ")]\n"
00053 //       << "    Reading key from file " << par("keyFile").stdstringValue()
00054 //       << endl;
00055 }
00056 
00057 void CryptoModule::signMessage(BaseRpcMessage *msg)
00058 {
00059     // need to remove controlInfo before serializing
00060     BaseRpcMessage *msgStripped = static_cast<BaseRpcMessage*>(msg->dup());
00061 
00062     if (msgStripped->getControlInfo() != NULL) {
00063             delete msgStripped->removeControlInfo();
00064     }
00065 
00066     // serialize message (needed to calculate message hash)
00067     commBuffer.reset();
00068     commBuffer.packObject(msgStripped);
00069     delete msgStripped;
00070 
00071     // calculate hash and signature
00072     // commBuffer.getBuffer(), commBuffer.getBufferLength()
00073 
00074     // ...
00075 
00076     // append public key and signature
00077     msg->setAuthBlockArraySize(1);
00078     msg->getAuthBlock(0).setPubKey(BinaryValue("123"));
00079     msg->getAuthBlock(0).setSignature(BinaryValue("456"));
00080     msg->getAuthBlock(0).setCert(BinaryValue("789"));
00081 
00082     // record statistics
00083     RECORD_STATS(numSign++);
00084 }
00085 
00086 bool CryptoModule::verifyMessage(BaseRpcMessage *msg)
00087 {
00088     if (msg->getAuthBlockArraySize() == 0) {
00089         // message contains no signature
00090         return false;
00091     }
00092 
00093     // need to remove controlInfo before serializing
00094     BaseRpcMessage *msgStripped = static_cast<BaseRpcMessage*>(msg->dup());
00095 
00096     if (msgStripped->getControlInfo() != NULL) {
00097             delete msgStripped->removeControlInfo();
00098     }
00099 
00100     // serialize message (needed to calculate message hash)
00101     commBuffer.reset();
00102     commBuffer.packObject(msgStripped);
00103     delete msgStripped;
00104 
00105     // calculate hash and signature
00106     commBuffer.getBuffer();
00107 
00108     //const BinaryValue& pubKey = msg->getAuthBlock(0).getPubKey();
00109     //const BinaryValue& signature = msg->getAuthBlock(0).getSignature();
00110     //const BinaryValue& cert = msg->getAuthBlock(0).getCert();
00111 
00112     //...
00113 
00114     return true;
00115 }
00116 
00117 void CryptoModule::handleMessage(cMessage *msg)
00118 {
00119     delete msg; // just discard everything we receive
00120 }
00121 
00122 void CryptoModule::finish()
00123 {
00124     simtime_t time = globalStatistics->calcMeasuredLifetime(
00125                              overlay->getCreationTime());
00126 
00127     if (time >= GlobalStatistics::MIN_MEASURED) {
00128         if (numSign > 0) {
00129             globalStatistics->addStdDev("CryptoModule: Sign Operations/s",
00130                                         numSign / time);
00131         }
00132     }
00133 }
00134 
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