GOST 28147-89 Core Implementation on Xilinx

This is a implementation of the GOST 28147-89 - a Soviet and Russian government standard symmetric key block cipher.
GOST 28147-89 has a 64-bit blocksize and 256-bit keysize.

This implementation provide trade off size and performance. The goal was to be able to fit in to a low cost Xilinx Spartan series FPGA and still be as fast as possible. As one can see from the implementation results below, this goal has been achieved.

Features

- SystemVerilog RTL and TB code is provided
- Implements both encryption and decryption in the same block
- GOST 28147-89 algorithm focusing on very low area applications
- Implementation takes about 32 cycles to encrypt/decrypt a block
- EBC-cipher mode support
- The core complies to use of S-box according to RFC4357/GOST R34.11-94 or RFC5830 (by synthesis), or S-box switch "on the fly" (realtime).

Status

- Core implementations have been tested on a Xilinx Spartan-3E FPGA succesfully
- This core is done. Initial Release: Apr. 17, 2012

Employment

For run synthesize design using Synplify tool use command:

  $ make synthesis

  $ make sim    

  $ make sim-gui

  GOST_R_3411_TESTPARAM - for RFC4357 S-box using
  GOST_R_3411_CRYPTOPRO - for RFC5830 S-box using
  GOST_R_3411_BOTH      - both RFC4357 and RFC5830 S-boxes using with switching "on the fly"

Synthesis

Sample Synthesis Results for the ECB-mode GOST 28147-89

Technology 	       Size/Area 	Speed/Performance
==============================================================
Xilinx Spartan-3E      525 LUTs         75 Mhz (150 Mbits/sec)

Limitations

The design uses SystemVerilog as language for RTL-implementation therefore your Design Tools should support SystemVerilog for synthesis and simulation.

ToDo

- Implementation testing with support Botan crypto-lib. It can be used in a DPI-based testbench as golden model or test vector generator
- Support for following cipher modes: CBC, CFB, OFB (and maybe CTR)
- Adding SoC-buses compatibility for seamless integration

References

- Description of GOST 28147-89 [ENGLISH]
- Description of GOST 28147-89 [RUSSIAN]


Feel free to send me comments, suggestions and bug reports.