Router: Fix decryption of blinded leasesets

Reverse cache wasn't regenerated at midnight,
so decryption would fail after the first routing key change.
We had the rollover() method but it wasn't called.

history.txt

@@ -1,5 +1,10 @@
+2021-03-27 zzz
+ * Router: Fix decryption of blinded leasesets
+
 2021-03-25 zzz
+ * i2ptunnel: Force non-SSL socket to local target for SSL ports
  * SSU: Implement IPv6 introductions (proposal 158)
+ * Transports: Don't open UPnP ports for disabled IPv4/v6
 
 2021-03-23 zzz
  * NetDB: Sort published addresses for consistency

router/java/src/net/i2p/router/NetworkDatabaseFacade.java

@@ -207,4 +207,11 @@ public abstract class NetworkDatabaseFacade implements Service {
     public boolean removeBlindData(SigningPublicKey spk) {
         return false;
     }
+
+    /**
+     *  Notify the netDB that the routing key changed at midnight UTC
+     *
+     *  @since 0.9.50
+     */
+    public void routingKeyChanged() {}
 }

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Git";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 9;
+    public final static long BUILD = 10;
 
     /** for example "-test" */
     public final static String EXTRA = "";

router/java/src/net/i2p/router/networkdb/kademlia/KademliaNetworkDatabaseFacade.java

@@ -498,6 +498,7 @@ public abstract class KademliaNetworkDatabaseFacade extends NetworkDatabaseFacad
      *  For console ConfigKeyringHelper
      *  @since 0.9.41
      */
+    @Override
     public List<BlindData> getBlindData() {
         return _blindCache.getData();
     }
@@ -508,9 +509,22 @@ public abstract class KademliaNetworkDatabaseFacade extends NetworkDatabaseFacad
      *  @return true if removed
      *  @since 0.9.41
      */
+    @Override
     public boolean removeBlindData(SigningPublicKey spk) {
         return _blindCache.removeBlindData(spk);
     }
+
+    /**
+     *  Notify the netDB that the routing key changed at midnight UTC
+     *
+     *  @since 0.9.50
+     */
+    @Override
+    public void routingKeyChanged() {
+        _blindCache.rollover();
+        if (_log.shouldInfo())
+            _log.info("UTC rollover, blind cache updated");
+    }
     
     /**
      *  @return RouterInfo, LeaseSet, or null, validated

router/java/src/net/i2p/router/tasks/UpdateRoutingKeyModifierJob.java

@@ -36,8 +36,10 @@ public class UpdateRoutingKeyModifierJob extends JobImpl {
         RouterKeyGenerator gen = getContext().routerKeyGenerator();
         // make sure we requeue quickly if just before midnight
         long delay = Math.max(5, Math.min(MAX_DELAY_FAILSAFE, gen.getTimeTillMidnight()));
-        // TODO tell netdb if mod data changed?
-        gen.generateDateBasedModData();
+        // tell netdb if mod data changed
+        boolean changed = gen.generateDateBasedModData();
+        if (changed)
+            getContext().netDb().routingKeyChanged();
         requeue(delay);
     }
 }