FES256

A fast and efficient implementation of a SHA256 cracker.

Implementation status

Have implemented a SHA256 hasher core at present, currently a version of the SHA256 cracker is been developed using this core.

Introduction

Hardware implementation of the SHA-256 cryptographic function. The implementation is written in C++(Vivado HLS) compliant code.

The hardware implementation is complemented by a functional model written in Python for the PYNQ framework v2.5.

Implementation details

The sha256 hasher IP design is divided into the following sections:

• SHA256_hasher/sha256.cpp - The sha256 hasher IP definitions.
• SHA256_hasher/sha256_tb.cpp - The testbench for simulating the design on HLS.
• SHA256_hasher/sha256.h - A header which lays an outline for the IP definitions.

The sha256 system design is divided into the following sections:-

• SHA256_hasher_system/archived_project - Contains an archived project with the system design on Vivado 2019.2.
• SHA256_hasher_system/(all the other remaining folders/files) - The actual folders/files for the system design project.

The block design was synthesized and implemented for a TUL PYNQ-Z2 featuring a Xilinx Zynq XC7Z020-1CLG400C SoC.

• SHA256_PYNQ/sha256_pynq.py - The Python driver for sha256 block design on PYNQ framework v2.5.

Fpga-results

Xilinx FPGAs

Implementation results using Vivado 2019.2.

TUL PYNQ-Z2

• Utilization Report(Block design)

Site Type	Used	Fixed	Available	Util%
Slice LUTs	5542	0	53200	10.42
LUT as Logic	5302	0	53200	9.97
LUT as Memory	240	0	17400	1.38
LUT as Distributed RAM	22	0
LUT as Shift Register	218	0
Slice Registers	8305	0	106400	7.81
Register as Flip Flop	8305	0	106400	7.81
Register as Latch	0	0	106400	0.00
F7 Muxes	0	0	26600	0.00
F8 Muxes	0	0	13300	0.00

• Fmax :- 142 MHz
• Performance in PYNQ framework v2.5 - 1.9 ms for a single hash(upto data size of about 600 characters)

TODO

• Implement the SHA256 cracker using the above developed hasher core.
• Try to implement the same design on ASIC/other FPGA's as well.
• Complete documentation.