Table of Contents

Overview

The Advanced Encryption Standard (AES) security modules provide hardware-accelerated data encryption and decryption operations based on a binary key. The AES is a symmetric cipher module that supports a 128-, 192-, or 256-bit key in hardware for both encryption and decryption. The AES module is based on a symmetric algorithm, meaning that the encryption and decryption keys are identical. To encrypt data means to convert it from plain text to an unintelligible form called cipher text. Decrypting cipher text converts previously encrypted data back to its original plain text form.

Application details

This application is a reference to usage of AES DriverLib functions on CC3200. Developers can refer to this simple application and re-use the functions in their applications.

aesdemo: This command allows the user to exercise the AES functionality on CC3200. The command needs two parameters:

• aes-mode - Select an AES algorithm. The value can be ECB, CBC, CTR, ICM, or CFB.
• key-len - Key length. The value can be 128, 192, or 256.

User will be prompted for inputs for key and plain text input. User can also undefine USER_INPUT in main.c to use the default test vectors for debugging (psAESCBCTestVectors in main.c).

Source Files briefly explained

• main.c - The main file that contains the core-logic for encryption and decryption. The functions in the file uses DriverLib calls to perform encryption and decryption.

Supporting files

• aes_userinput.c - This file is used in the USER-INPUT mode. The function in the file reads the input from the user, parses the input string and feed the core-logic functions in the aes_main.c
• pinmux.c - UART0 pins are brought out in this file.
• startup_*.c - Initialize vector table and IDE related functions
• uart_if.c - Functions to display information on UART

Usage

1. Setup a serial communication application. Open a serial terminal on a PC with the following settings:
   • Port: Enumerated COM port
   • Baud rate: 115200
   • Data: 8 bit
   • Parity: None
   • Stop: 1 bit
   • Flow control: None
2. Run the reference application.
   • Open the project in CCS/IAR. Build the application and debug to load to the device, or flash the binary using UniFlash.
3. A prompt will appear on the terminal. Enter the aesdemo command with your chosen inputs as shown above.

Limitations/Known Issues