Android PIN Entry Demo

I need two android applications written, a server and a client. Both will run on the same device. The Server application: 1. Is launched (either explicitly, on startup, or on demand somehow from the client connection; whichever is easiest) and waits for a "GetPIN" request. This can be a network socket or some other interprocess communication mechanism. 2. As a static configuration parameter (from a file or some other mechanism) the server reads a passphrase string. This string will be used to form a AES256 encryption key. 3. When the Server receives the "GetPIN" request, the Server takes control of the UI and displays a UI containing a text box at the top and a pin entry layout. 4. The pin entry layout has the following characteristics: -10 digit keys 0-9 -A single cancel key -Each time the pin entry is displayed the digit keys are layed out in a random pattern -Each time a digit is pressed the corresponding numeric character is added to the collected digits string and a generic circle symbol is displayed in the text box. -When the 4th digit is entered: - The symbols in the text box are replaced with the 4 digits collected from the user - The Server encrypts the 4 digit string using the AES256 key generated with the pass phrase in the configuration and the Server UI closes - The Server responds to the client GetPIN request with a json response structure similar to the following: - {"pinCaptured":true, "encPin":"base64encoding of the encrypted pin"} -If the user selects the cancel button the UI closes and the server responds to the client with a json response structure similar to the following: - { "pinCaptured":false, "encPin":null } - The Server waits for the next GetPIN request The Client application: 1. Is invoked by the user 2. As a static configuration parameter (from a file or some other mechanism) the client reads a passphrase string. This string will be used to form a AES256 decryption key. 3. The Client displays a single "Enter Pin" button. 4. Then the user selects the "Enter Pin" button the client initiates a "GetPIN" request to the server via the network socket or some other interprocess communication mechanism. 5. The Client waits for the response and parses the json result. 6. If the pinCaptured==true, the Client base64 decodes the encPin value, then decrypts the result and displays the 4 digit pin captured by the server. 7. If the pinCaptured==false, the Client displays "Canceled"