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hash-base
Advanced tools
Package description
The hash-base package is a Node.js module that provides a base implementation for creating hash functions. It is designed to be extended by other modules to create specific hash function implementations. The package simplifies the process of implementing hash algorithms by handling common tasks such as buffering and streaming data.
Streaming data through hash function
This code demonstrates how to extend the HashBase class to create a custom hash function. It involves defining the block size in the constructor, implementing the _update method to update the hash state, and the _digest method to produce the final hash output.
"use strict";
const HashBase = require('hash-base');
class MyHash extends HashBase {
constructor () {
super(64); // block size
}
_update () {
// update hash state with this._block
}
_digest () {
// return the final hash
return Buffer.from([]);
}
}
const hash = new MyHash();
hash.update('Hello, world!');
console.log(hash.digest('hex'));
The 'crypto' module is a built-in Node.js module that provides cryptographic functionality. It includes a wide range of cryptographic functions, including hash, HMAC, cipher, decipher, sign, and verify functions. Unlike hash-base, which is designed for creating custom hash functions, 'crypto' provides ready-to-use implementations of various cryptographic algorithms.
The 'sha.js' package is a simple module for hashing messages with SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512. It is similar to hash-base in that it focuses on hashing functionalities but differs by providing specific implementations of SHA algorithms rather than a base framework for creating custom hash functions.
The 'md5.js' package is a JavaScript function for hashing messages with MD5. It is designed for simplicity and ease of use for MD5 hashing specifically. While hash-base provides a base for creating various hash functions, 'md5.js' is focused solely on MD5 hashing, making it less flexible but easier to use for MD5-specific applications.
Readme
Abstract base class to inherit from if you want to create streams implementing the same API as node crypto Hash (for Cipher / Decipher check crypto-browserify/cipher-base).
const HashBase = require('hash-base')
const inherits = require('inherits')
// our hash function is XOR sum of all bytes
function MyHash () {
HashBase.call(this, 1) // in bytes
this._sum = 0x00
}
inherits(MyHash, HashBase)
MyHash.prototype._update = function () {
for (let i = 0; i < this._block.length; ++i) this._sum ^= this._block[i]
}
MyHash.prototype._digest = function () {
return this._sum
}
const data = Buffer.from([ 0x00, 0x42, 0x01 ])
const hash = new MyHash().update(data).digest()
console.log(hash) // => 67
You also can check source code or crypto-browserify/md5.js
MIT
FAQs
abstract base class for hash-streams
The npm package hash-base receives a total of 8,779,648 weekly downloads. As such, hash-base popularity was classified as popular.
We found that hash-base demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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