Blakecoin mod of OpenCL blake-256 hashing

Untested but modded reduced rounds ready for porting into GPU miner as a kernel

• blake256.cl

other code untouched and unmodded

clblake

Experimental tree hasher using an OpenCL port of BLAKE-256

date

$Date: Thu, 09 Aug 2012 16:10:51 +0200 $

About

This program a rough draft, a prototype. It will eat your hamster.

It includes

• a simplified OpenCL (OpenCL) implementation of the BLAKE-256 (BLAKEWikipedia) algorithm
• C, SSE2 and SSSE3 optimized CPU implementations of BLAKE-256

The "tree" can be tuned statically in BlakeTree.h. Its height is only 2 at the moment. Do note that the tree configuration affects the resulting hash.

This program is inspired by Keccak.Tree.GPU (KeccakTreeGPU).

Tree hashing is implemented both for OpenCL and the CPU. The latter uses OpenMP (OpenMP).

Requirements

• A GPU with OpenCL support

  only tested with the nvidia blob on GNU/Linux, amd64 architecture.

• GCC 4 and GNU Make
• OpenCL development libs/headers
• glib (only used for the FIFO queue, can be replaced easily)

Examples

GPU test

./blaketree -v -t

Output:

DEBUG: Blake-256 CPU implementation: SSSE3
CPU hash test...
CPU hash is valid
GPU hash test...
DEBUG: Using platform: NVIDIA CUDA
DEBUG: Using OpenCL source: blake256.cl
DEBUG: 1716.2 MiB/s

Using sparse files to test the optimal file throughput

truncate -s 1G zero.1GiB

Hashing a file on the GPU

./blaketree -v zero.1GiB

Output:

DEBUG: Blake-256 CPU implementation: SSSE3
DEBUG: Using platform: NVIDIA CUDA
DEBUG: Using OpenCL source: blake256.cl
da282d6960ede0b5fc7972916b72f1fef4fbf56898ee014a0af7adf0db3af50d
DEBUG: 975.5 MiB/s

Hashing a file on the CPU

./blaketree -v -c zero.1GiB

Output:

DEBUG: Blake-256 CPU implementation: SSSE3
da282d6960ede0b5fc7972916b72f1fef4fbf56898ee014a0af7adf0db3af50d
DEBUG: 435.9 MiB/s

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see (http://www.gnu.org/licenses/).

3rd party code

The program includes modified 3rd party code:

• BLAKE-256 SSE2 and SSSE3 optimizations from (SuperCop).

  License: public domain

• The BLAKE-256 reference implementation.

  License: public domain