missing files for PR eclipse-leshan#7

src/main/java/org/eclipse/californium/scandium/dtls/pskstore/InMemoryPskStore.java

@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Institute for Pervasive Computing, ETH Zurich and others.
+ * 
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ * 
+ * The Eclipse Public License is available at
+ *    http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ *    http://www.eclipse.org/org/documents/edl-v10.html.
+ * 
+ * Contributors:
+ * Julien Vermillard - Sierra Wireless
+ ******************************************************************************/
+package org.eclipse.californium.scandium.dtls.pskstore;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * An in-memory pre-shared-key storage. To be used only for testing and evaluation. 
+ * You are supposed to store your key in a secure way: 
+ * keeping them in-memory is not a good idea.
+ */
+public class InMemoryPskStore implements PskStore {
+
+    private Map<String, byte[]> keys = new ConcurrentHashMap<>();
+
+    @Override
+    public byte[] getKey(String identity) {
+        byte[] key = keys.get(identity);
+        if (key == null) {
+            return null;
+        } else {
+            // defensive copy
+            return Arrays.copyOf(key, key.length);
+        }
+    }
+
+    /**
+     * Set a key value for a given identity.
+     * 
+     * @param identity the identity associated with the key
+     * @param key the key used to authenticate the identity
+     */
+    public void setKey(String identity, byte[] key) {
+        keys.put(identity, key);
+    }
+}

src/main/java/org/eclipse/californium/scandium/dtls/pskstore/PskStore.java

@@ -0,0 +1,30 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Institute for Pervasive Computing, ETH Zurich and others.
+ * 
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ * 
+ * The Eclipse Public License is available at
+ *    http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ *    http://www.eclipse.org/org/documents/edl-v10.html.
+ * 
+ * Contributors:
+ * Julien Vermillard - Sierra Wireless
+ ******************************************************************************/
+package org.eclipse.californium.scandium.dtls.pskstore;
+
+/**
+ * A storage for pre-shared-key identity.
+ */
+public interface PskStore {
+
+    /**
+     * Get the key for a given identity.
+     * @param identity the identity to authenticate
+     * @return the key or <code>null</code> if not found
+     */
+    byte[] getKey(String identity);
+
+}