node-clhash

node-clhash

Node.js library that provides bindings for the CLHash C library (https://github.com/lemire/clhash).

The package compilation requirements are the same as the CLHash library requirements (see https://github.com/lemire/clhash#requirements).

To install the package run the following command:

$ npm install node-clhash
# Or if you use yarn
$ yarn add node-clhash

The get_random_key_for_clhash uses posix_memalign internally and needs to be the key pointer to be aligned. The library does not expose binding for the get_random_key_for_clhash and doesn't allow the user to generate its key. Instead, it generates the key and then the hashed value and returns both values to the user:

const { clhash } = require('node-clhash');
// Generate synchronously.
const { key, hashed } = clhash.sync('my long string');
console.log({ key, hashed }); // { key: 5067639175440424385n, hashed: 8451564168848164053n }

// Generate asynchronously.
clhash('my long string', (error, { key, hashed }) => {
  console.log({ key, hashed }); // { key: 5067639175440424385n, hashed: 8451564168848164053n }
});

The key and hashed values are BigInt. The clhash returns uint64_t, which is unsigned long long. The maximum uint64_t value is 2 ^ 64 - 1 and the maximum JavaScript integer value is 2 ^ 53 - 1 (Number.MAX_SAFE_INTEGER).