Pyjamask on Cortex-M4

This repository provides the source code of a high-order masked implementation of Pyjamask on ARM Cortex-M4. The source code has been tested on STM32F407 Discovery Kit.

Authors

• Dahmun Goudarzi (PQShield)
• Matthieu Rivain (CryptoExperts)

Contents

Source files

• masked_pyjamask.c: main Pyjamask functions (key schedule, encryption, decryption) for both 96 and 128 modes;
• masked_pyjamask_asm.S: optimized assembly functions for the masked implementation of Pyjamask (matrix vector multiplication, ISW MACC, randomness generation);
• random.c: call the hardware RNG of the STM32F407 board (only use to generate the initial masks of the state and the keys);

Two versions (v1 and v2) of the code source are provided. v2 is optimized for timings with a larger code size than v1. See the specification document for details.

Header files

• api.h: prototypes of main entry points;
• param.h: definition of implementation parameters:
  • the masking order,
  • hardware RNG configuration constants;
• random.h: prototypes for random generation function.

Documentation

The detailed description of this implementation as well as a performance benchmark can be found in the Pyjamask specification document.

Setup

Some guidelines for installing the tools can be found here.