* I2CP Client: Generate revocation key of same type as signing key

* i2ptunnel: Only offer Sig options that are available in the JVM
 * LeaseSet: Add check for SigTYpe mismatch
 * SigType: Add isAvailable()

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/web/EditBean.java

@@ -15,6 +15,7 @@ import java.util.Set;
 import java.util.TreeMap;
 
 import net.i2p.client.I2PClient;
+import net.i2p.crypto.SigType;
 import net.i2p.data.Base64;
 import net.i2p.data.Destination;
 import net.i2p.data.PrivateKeyFile;
@@ -183,6 +184,12 @@ public class EditBean extends IndexBean {
         return getProperty(tunnel, I2PClient.PROP_SIGTYPE, 0);
     }
     
+    /** @since 0.9.12 */
+    public boolean isSigTypeAvailable(int code) {
+        SigType type = SigType.getByCode(code);
+        return type != null && type.isAvailable();
+    }
+    
     /** @since 0.8.9 */
     public boolean getDCC(int tunnel) {
         return getBooleanProperty(tunnel, I2PTunnelIRCClient.PROP_DCC);