--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ch/ethz/ssh2/transport/ClientServerHello.java	Fri Jul 18 11:21:46 2014 -0700
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
+ * Please refer to the LICENSE.txt for licensing details.
+ */
+
+package ch.ethz.ssh2.transport;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.LineNumberReader;
+import java.io.OutputStream;
+
+import ch.ethz.ssh2.util.StringEncoder;
+
+/**
+ * @author Christian Plattner
+ * @version $Id: ClientServerHello.java 155 2014-04-28 12:01:19Z dkocher@sudo.ch $
+ */
+public class ClientServerHello {
+    private final String client_line;
+    private final String server_line;
+
+    private ClientServerHello(String client_line, String server_line) {
+        this.client_line = client_line;
+        this.server_line = server_line;
+    }
+
+    public static ClientServerHello clientHello(String softwareversion, InputStream bi, OutputStream bo)
+            throws IOException {
+        return exchange(softwareversion, bi, bo, true);
+    }
+
+    public static ClientServerHello serverHello(String softwareversion, InputStream bi, OutputStream bo)
+            throws IOException {
+        return exchange(softwareversion, bi, bo, false);
+    }
+
+    private static ClientServerHello exchange(String softwareversion, InputStream bi, OutputStream bo, boolean clientMode)
+            throws IOException {
+        String localIdentifier = String.format("SSH-2.0-%s", softwareversion);
+
+        bo.write(StringEncoder.GetBytes(String.format("%s\r\n", localIdentifier)));
+        bo.flush();
+
+        // Expect SSH-protoversion-softwareversion SP comments CR LF
+        String remoteIdentifier = new LineNumberReader(new InputStreamReader(bi)).readLine();
+        if(null == remoteIdentifier) {
+            throw new IOException("Premature connection close");
+        }
+        if(!remoteIdentifier.startsWith("SSH-")) {
+            throw new IOException(String.format("Malformed SSH identification %s", remoteIdentifier));
+        }
+        if(!remoteIdentifier.startsWith("SSH-1.99-")
+                && !remoteIdentifier.startsWith("SSH-2.0-")) {
+            throw new IOException(String.format("Incompatible remote protocol version %s", remoteIdentifier));
+        }
+        if(clientMode) {
+            return new ClientServerHello(localIdentifier, remoteIdentifier);
+        }
+        else {
+            return new ClientServerHello(remoteIdentifier, localIdentifier);
+        }
+    }
+
+    /**
+     * @return Returns the client_versioncomment.
+     */
+    public byte[] getClientString() {
+        return StringEncoder.GetBytes(client_line);
+    }
+
+    /**
+     * @return Returns the server_versioncomment.
+     */
+    public byte[] getServerString() {
+        return StringEncoder.GetBytes(server_line);
+    }
+}