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README.md
README.md
 
 
apio.ini
apio.ini
 
 
tea-decrypt.v
tea-decrypt.v
 
 
tea-encrypt.v
tea-encrypt.v
 
 
tea-reference-code.c
tea-reference-code.c
 
 
tea.pcf
tea.pcf
 
 
tea.v
tea.v
 
 
tea_tb.v
tea_tb.v
 
 

README.md

Tiny Encryption Algorithm (TEA) in Verilog

Verilog implementation of the Tiny Encryption Algorithm designed for the constraints of a Lattice Icestick FPGA.

Overview

This implementation is meant to be used as a learning project for Verilog and basic encryption concepts. It goes without saying that this is not a secure encryption library and should not be used in any security-sensitive applications.

Repository Contents

  • tea.v: Main module
  • tea_encrypt.v: Module for TEA encryption
  • tea_decrypt.v: Module for TEA decryption
  • tea_tb.v: Testbench for verifying the TEA implementation
  • tea-reference-code.c: C code from Wikipedia
  • tea.pcf: Pinout file

TEA Algorithm

TEA operates on 64-bit blocks using a 128-bit key. It performs 32 rounds of simple operations, including XORs, additions, and bitshifts.

Testing

The tea_tb.v file provides a basic testbench for verifying the correctness of the TEA implementation.

Running it

Simulate it with Apio and GTKWave

  • apio build
  • apio sim

The value to be encrypted as well as the key are hardcoded as I haven't got around to implementing an interface to the FPGA. Hence the most visible way of running the code is in simulation.