OpenPGP: Bump Pgpainless to 0.0.1-alpha7

Also unify how new Security Providers are installed.

Thanks to Paul Schaub for helping with this.

smack-core/src/main/java/org/jivesoftware/smack/util/SecurityUtil.java

@@ -0,0 +1,53 @@
+/**
+ *
+ * Copyright 2019 Florian Schmaus.
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.security.Provider;
+import java.security.Security;
+
+import org.jxmpp.util.cache.LruCache;
+
+public class SecurityUtil {
+
+    private static final LruCache<Class<? extends Provider>, Void> INSERTED_PROVIDERS_CACHE = new LruCache<>(8);
+
+    public static void ensureProviderAtFirstPosition(Class<? extends Provider> providerClass) {
+        if (INSERTED_PROVIDERS_CACHE.containsKey(providerClass)) {
+            return;
+        }
+
+        Provider provider;
+        try {
+            provider = providerClass.getDeclaredConstructor().newInstance();
+        } catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
+                | NoSuchMethodException | SecurityException e) {
+            throw new IllegalArgumentException(e);
+        }
+
+        String providerName = provider.getName();
+
+        int installedPosition ;
+        synchronized (Security.class) {
+            Security.removeProvider(providerName);
+            installedPosition = Security.insertProviderAt(provider, 1);
+        }
+        assert installedPosition == 1;
+
+        INSERTED_PROVIDERS_CACHE.put(providerClass, null);
+    }
+}