:city_sunrise: Discohash

2 - 5 GB/s, passed SMHasher

Discohash (also known as BEBB4185) is a super-fast hash that passes all of SMHasher, and runs at 2 - 5 GB/s (depending on hardware) in this naive, portable implementation.

CLI app included

Quick Facts

• A super-fast 64-bit hash.
• Tested at ~ 5GB/s @ 3Gz.
• Passes all SMHasher tests.
• Also known as: BEBB4185
• Implemented in C++, and also a port to JS
• This repo includes a simple CLI app for hashing files or stdin from the command line.

Using

Use the C code from this repository, either in your project or as a CL-app (included):

cd src
./build.sh
./bin/bebbsum < 0xa2a647993898a3df.txt
> 0xa2a647993898a3df
./bin/bebbsum 0xa2a647993898a3df.txt
> 0xa2a647993898a3df

or, for a JS implementation:

npm i --save bebb4185

Use in Node.JS:

import {discohash} from 'bebb4185'

Or using Snowpack as a webmodule:

import {discohash} from './web_modules/bebb4185.js';

Then call it:

const hash = discohash(string_or_typed_array_key, optional_seed);

JS Implementation

• The JS Implementation produces the same value hashes as the C++ implementation.
• The JS implementation is ~ 500x slower than the C++ implementation.
• This is probably because of the use of BigInts to stand in for uint64_t
• It's possible to implement a 64-bit mult using 32-bit view which would remove the need for BigInt. I have no plan to do this.

SMHasher verification value

The value is: BEBB4185

Possible future work

Make a parallel version using Merkle tree