keccak

What is keccak?

The keccak npm package provides an implementation of the Keccak cryptographic hash function, which is the basis for the SHA-3 (Secure Hash Algorithm 3) standard. It allows developers to generate hash digests of data, which can be used for data integrity verification, digital signatures, and other cryptographic applications.

What are keccak's main functionalities?

Hashing a string

This feature allows you to hash a string using the Keccak-256 algorithm. The code sample demonstrates how to hash the string 'hello world' and output the resulting hash in hexadecimal format.

const keccak = require('keccak');
const hash = keccak('keccak256').update('hello world').digest('hex');
console.log(hash);

Hashing a buffer

This feature allows you to hash a buffer using the Keccak-256 algorithm. The code sample demonstrates how to hash a buffer containing the string 'hello world' and output the resulting hash in hexadecimal format.

const keccak = require('keccak');
const buffer = Buffer.from('hello world');
const hash = keccak('keccak256').update(buffer).digest('hex');
console.log(hash);

Hashing with different Keccak variants

This feature allows you to use different variants of the Keccak algorithm, such as Keccak-256 and Keccak-512. The code sample demonstrates how to hash the string 'hello world' using both Keccak-256 and Keccak-512, and output the resulting hashes in hexadecimal format.

const keccak = require('keccak');
const hash256 = keccak('keccak256').update('hello world').digest('hex');
const hash512 = keccak('keccak512').update('hello world').digest('hex');
console.log('Keccak-256:', hash256);
console.log('Keccak-512:', hash512);

Other packages similar to keccak

sha3

The sha3 package provides an implementation of the SHA-3 (Secure Hash Algorithm 3) standard, which is based on the Keccak algorithm. It offers similar functionality to the keccak package, allowing you to generate SHA-3 hash digests of data. The main difference is that sha3 focuses on the standardized SHA-3 variants, while keccak provides more direct access to the Keccak algorithm itself.

crypto-js

The crypto-js package is a widely-used library that provides a variety of cryptographic algorithms, including SHA-3. It offers a broader range of cryptographic functions compared to keccak, such as AES encryption, HMAC, and PBKDF2. While it includes SHA-3 hashing, it is more general-purpose and not specifically focused on the Keccak algorithm.

js-sha3

The js-sha3 package is a lightweight library that provides an implementation of the SHA-3 (Keccak) hash functions. It is similar to keccak in that it focuses on the Keccak algorithm, but it is designed to be minimalistic and easy to use in web applications. It supports various SHA-3 hash lengths, including SHA3-224, SHA3-256, SHA3-384, and SHA3-512.

README

keccak

This module provides native bindings to Keccak sponge function family from Keccak Code Package. In browser pure JavaScript implementation will be used.

Usage

You can use this package as node Hash.

const createKeccakHash = require('keccak')

console.log(createKeccakHash('keccak256').digest().toString('hex'))
// => c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470

console.log(createKeccakHash('keccak256').update('Hello world!').digest('hex'))
// => ecd0e108a98e192af1d2c25055f4e3bed784b5c877204e73219a5203251feaab

Also object has two useful methods: _resetState and _clone

const createKeccakHash = require('keccak')

console.log(createKeccakHash('keccak256').update('Hello World!')._resetState().digest('hex'))
// => c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470

const hash1 = createKeccakHash('keccak256').update('Hello')
const hash2 = hash1._clone()
console.log(hash1.digest('hex'))
// => 06b3dfaec148fb1bb2b066f10ec285e7c9bf402ab32aa78a5d38e34566810cd2
console.log(hash1.update(' world!').digest('hex'))
// => throw Error: Digest already called
console.log(hash2.update(' world!').digest('hex'))
// => ecd0e108a98e192af1d2c25055f4e3bed784b5c877204e73219a5203251feaab

Why I should use this package?

I thought it will be popular question, so I decide write explanation in readme.

I know a few popular packages on npm related with Keccak:

• sha3 (phusion/node-sha3 on github) — not actual because support only keccak.
• js-sha3 (emn178/js-sha3 on github) — brilliant package which support keccak, sha3, shake. But not implement node Hash interface unfortunately!
• browserify-sha3 (wanderer/browserify-sha3 on github) — based on js-sha3 (but not support shake!). Support node Hash interface, but without streams.
• keccakjs (axic/keccakjs on github) — uses sha3 and browserify-sha3 as fallback. As result keccak only with node Hash interface without streams.

LICENSE

This library is free and open-source software released under the MIT license.