Fix for Bug #57985 r=hyatt,ddrinan a=hyat

Have HandleDOMEvent gather some information about mouse left button
  down events and pass it on to the entropy collector.

dom/public/MANIFEST_IDL

@@ -1,3 +1,4 @@
 domstubs.idl
 nsIScriptContextOwner.idl
 nsIScriptGlobalObjectOwner.idl
+nsIEntropyCollector.idl

dom/public/makefile.win

@@ -27,6 +27,7 @@ DIRS=base coreDom coreEvents range events html css
 XPIDLSRCS = .\domstubs.idl \
 				.\nsIScriptContextOwner.idl \
 				.\nsIScriptGlobalObjectOwner.idl \
+				.\nsIEntropyCollector.idl \
 				$(NULL)
 
 

dom/public/nsIEntropyCollector.idl

@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is Mozilla code.
+ *
+ * Contributor(s): 
+ *  Javier Delgadillo <javi@netscape.com>
+ */
+
+#include "nsISupports.idl"
+
+/**
+ * Interface for an object that wants to gather "random"
+ * data to be used for entropy purposes.
+ */
+%{C++
+
+// Define CID {29a1d8b6-ac5a-11d4-9978-00b0d02354a0}
+#define NS_ENTROPYCOLLECTOR_CID \
+ { 0x29a1d8b6, 0xac5a, 0x11d4, \
+  { 0x00, 0xb0, 0xd0, 0x23, 0x54, 0xa0 } }
+
+/*
+ * If anyone wants to collect the entropy distributed by the
+ * event handler, they'll have to implement this CONTRACTID
+ */
+#define NS_ENTROPYCOLLECTOR_CONTRACTID "@mozilla.org/security/entropy;1"
+%}
+/* Buffer type - for passing random data to the entropy
+ * collector.
+ */
+[ptr] native buffer(void);
+
+[uuid(6f883680-ab9d-11d4-9978-00b0d02354a0)]
+interface nsIEntropyCollector : nsISupports
+{
+
+  /**
+   * Add the following bytes to the pool of data to be used
+   * in gathering entropy.
+   */
+  void randomUpdate(in buffer entropy, in long bufLen); 
+
+};

dom/src/base/nsGlobalWindow.cpp

@@ -98,6 +98,7 @@
 #include "nsIWebBrowserChrome.h"
 #include "nsIWebShell.h"
 #include "nsIComputedDOMStyle.h"
+#include "nsIEntropyCollector.h"
 #include "nsDOMCID.h"
 #include "nsDOMError.h"
 
@@ -109,6 +110,9 @@
 #include "nsIXBLService.h"
 
 
+nsIEntropyCollector* gEntropyCollector = nsnull;
+PRInt32              gRefCnt           = 0;
+
 // CIDs
 static NS_DEFINE_IID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
 static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
@@ -138,6 +142,13 @@ GlobalWindowImpl::GlobalWindowImpl() :
   mChromeEventHandler(nsnull)
 {
   NS_INIT_REFCNT();
+  if (gRefCnt++ == 0) {
+    nsCOMPtr<nsIEntropyCollector> enCol(do_GetService(NS_ENTROPYCOLLECTOR_CONTRACTID));
+    if (enCol) {
+      gEntropyCollector = enCol;
+      NS_ADDREF(gEntropyCollector);
+    }
+  }
 }
 
 GlobalWindowImpl::~GlobalWindowImpl()
@@ -163,6 +174,9 @@ void GlobalWindowImpl::CleanUp()
   NS_IF_RELEASE(mLocation);
   NS_IF_RELEASE(mFrames);
   mOpener = nsnull;             // Forces Release
+  if (--gRefCnt == 0) {
+    NS_IF_RELEASE(gEntropyCollector);
+  }
 }
 
 //*****************************************************************************
@@ -473,6 +487,24 @@ NS_IMETHODIMP GlobalWindowImpl::HandleDOMEvent(nsIPresContext* aPresContext,
   nsCOMPtr<nsIChromeEventHandler> kungFuDeathGrip1(mChromeEventHandler);
   nsCOMPtr<nsIScriptContext> kungFuDeathGrip2(mContext);
 
+  /* If this is a mouse event, use the struct to provide entropy for 
+   * the system.
+   */
+  if (gEntropyCollector && !mChromeEventHandler &&
+      (NS_EVENT_FLAG_BUBBLE != aFlags) && 
+      (aEvent->message == NS_MOUSE_LEFT_BUTTON_DOWN)) {
+    //Since the high bits seem to be zero's most of the time, 
+    //let's only take the lowest half of the point structure.
+    PRInt16 myCoord[4];
+
+    myCoord[0] = aEvent->point.x;
+    myCoord[1] = aEvent->point.y;
+    myCoord[2] = aEvent->refPoint.x;
+    myCoord[3] = aEvent->refPoint.y;
+    gEntropyCollector->RandomUpdate((void*)myCoord, sizeof(myCoord));
+    gEntropyCollector->RandomUpdate((void*)&aEvent->time, sizeof(PRUint32));
+  }
+
   if (NS_EVENT_FLAG_INIT & aFlags) {
     if (!aDOMEvent) {
       aDOMEvent = &domEvent;