--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/net/sourceforge/jsocks/UserPasswordAuthentication.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,75 @@
+package net.sourceforge.jsocks;
+
+/**
+  SOCKS5 User Password authentication scheme.
+*/
+public class UserPasswordAuthentication implements Authentication{
+
+   /**SOCKS ID for User/Password authentication method*/
+   public final static int METHOD_ID = 2;
+
+   String userName, password;
+   byte[] request;
+
+   /**
+     Create an instance of UserPasswordAuthentication.
+     @param userName User Name to send to SOCKS server.
+     @param password Password to send to SOCKS server.
+   */
+   public UserPasswordAuthentication(String userName,String password){
+     this.userName = userName;
+     this.password = password;
+     formRequest();
+   }
+   /** Get the user name.
+   @return User name.
+   */
+   public String getUser(){
+     return userName;
+   }
+   /** Get password
+   @return Password
+   */
+   public String getPassword(){
+     return password;
+   }
+   /**
+    Does User/Password authentication as defined in rfc1929.
+    @return An array containnig in, out streams, or null if authentication
+    fails.
+   */
+   public Object[] doSocksAuthentication(int methodId,
+                                         java.net.Socket proxySocket)
+                   throws java.io.IOException{
+
+      if(methodId != METHOD_ID) return null;
+
+      java.io.InputStream in = proxySocket.getInputStream();
+      java.io.OutputStream out = proxySocket.getOutputStream();
+
+      out.write(request);
+      int version = in.read();
+      if(version < 0) return null; //Server closed connection
+      int status = in.read();
+      if(status != 0) return null; //Server closed connection, or auth failed.
+
+      return new Object[] {in,out};
+   }
+
+//Private methods
+//////////////////
+
+/** Convert UserName password in to binary form, ready to be send to server*/
+   private void formRequest(){
+      byte[] user_bytes = userName.getBytes();
+      byte[] password_bytes = password.getBytes();
+
+      request = new byte[3+user_bytes.length+password_bytes.length];
+      request[0] = (byte) 1; 
+      request[1] = (byte) user_bytes.length;
+      System.arraycopy(user_bytes,0,request,2,user_bytes.length);
+      request[2+user_bytes.length] = (byte) password_bytes.length;
+      System.arraycopy(password_bytes,0,
+                       request,3+user_bytes.length,password_bytes.length);
+   }
+}