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diff --git a/src/github/daneren2005/dsub/service/ssl/TrustStrategy.java b/src/github/daneren2005/dsub/service/ssl/TrustStrategy.java
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+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package github.daneren2005.dsub.service.ssl;
+
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+
+/**
+ * A strategy to establish trustworthiness of certificates without consulting the trust manager
+ * configured in the actual SSL context. This interface can be used to override the standard
+ * JSSE certificate verification process.
+ *
+ * @since 4.1
+ */
+public interface TrustStrategy {
+
+    /**
+     * Determines whether the certificate chain can be trusted without consulting the trust manager
+     * configured in the actual SSL context. This method can be used to override the standard JSSE
+     * certificate verification process.
+     * <p>
+     * Please note that, if this method returns <code>false</code>, the trust manager configured
+     * in the actual SSL context can still clear the certificate as trusted.
+     *
+     * @param chain the peer certificate chain
+     * @param authType the authentication type based on the client certificate
+     * @return <code>true</code> if the certificate can be trusted without verification by
+     *   the trust manager, <code>false</code> otherwise.
+     * @throws CertificateException thrown if the certificate is not trusted or invalid.
+     */
+    boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException;
+
+}