Table of Contents

Overview

The SHA/MD5 module provides hardware-accelerated hash functions with support for:

• MD5 message digest algorithm developed by Ron Rivest in 1991
• SHA-1 algorithm compliant with the FIPS 180-3 standard
• The algorithms produce a condensed representation of a message or a data file, called digest or signature, which can then be used to verify the message integrity.
• Hashing of 0 to 233 – 2 bytes of data (of which 232 – 1 bytes are in one pass) using the MD5, SHA-1, SHA-224, or SHA-256 hash algorithm (byte granularity only, no support for bit granularity)
• Automatic HMAC key preprocessing for HMAC keys up to 64 bytes
• Host-assisted HMAC key preprocessing for HMAC keys larger than 64 bytes
• HMAC from precomputes (inner/outer digest) for improved performance on small blocks
• Support of μDMA operation for data and context in/result out transfers
• Support of interrupt to read the digest (signature)

Application details

The application is a reference for SHAMD5 DriverLib functions on the CC3200. Developers can refer to this simple application and re-use the functions in their applications.

• hash: This command allows the user to excercise the hashing (SHAMD5) funcitonality on CC3200. The command needs one parameter:
  • shamd5_mode: hashing algorithm. The value can be MD5, SHA1, SHA224, SHA256, HMAC_MD5, HMAC_SHA1, HMAC_SHA224, or HMAC_SHA256. 

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 g_psHMACShaMD5TestVectors in shamd5_vector.h.

Source Files briefly explained

• main.c - The main file that contians the core-logic for encryption and decryption. The functions in the file uses DriverLib calls to perform encryption and decryption.
• shamd5_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 shamd5_main.c
• pinmux.c - Generated by the PinMUX utility. 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 command with your chosen input as shown above.

Limitations/Known Issues