Resolve Bug:623 : Generate private key using bouncycastle.

[controller.git] / opendaylight / netconf / netconf-ssh / src / main / java / org / opendaylight / controller / netconf / ssh / authentication / PEMGenerator.java

diff --git a/opendaylight/netconf/netconf-ssh/src/main/java/org/opendaylight/controller/netconf/ssh/authentication/PEMGenerator.java b/opendaylight/netconf/netconf-ssh/src/main/java/org/opendaylight/controller/netconf/ssh/authentication/PEMGenerator.java
new file mode 100644 (file)
index 0000000..73886c4
--- /dev/null
+++ b/opendaylight/netconf/netconf-ssh/src/main/java/org/opendaylight/controller/netconf/ssh/authentication/PEMGenerator.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.netconf.ssh.authentication;
+
+import org.apache.commons.io.FileUtils;
+import org.bouncycastle.openssl.PEMWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.security.Key;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.SecureRandom;
+
+public class PEMGenerator {
+    private static final Logger logger = LoggerFactory.getLogger(PEMGenerator.class);
+    private static final int KEY_SIZE = 4096;
+
+    public static String generateTo(File privateFile) throws Exception {
+        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
+        SecureRandom sr = new SecureRandom();
+        keyGen.initialize(KEY_SIZE, sr);
+        KeyPair keypair = keyGen.generateKeyPair();
+        logger.info("Generating private key to {}", privateFile.getAbsolutePath());
+        String privatePEM = toString(keypair.getPrivate());
+        FileUtils.write(privateFile, privatePEM);
+        return privatePEM;
+    }
+
+    private static String toString(Key key) throws IOException {
+        try (StringWriter writer = new StringWriter()) {
+            try (PEMWriter pemWriter = new PEMWriter(writer)) {
+                pemWriter.writeObject(key);
+            }
+            return writer.toString();
+        }
+    }
+}