4.0.2

5um

Fast "hash" algorithm designed for insecure hashing usage.
Sometimes you need a fast hash but you don't care about the security of the hash.

Use Cases

• Detect if a file has changed
  You can check if a file has changed by using this hash funcion.
• Fast Lookup in Large Data Sets
  If you need to compare large volumes of data and only require a quick match
• Duplicate Detection
  You can employ "5um" to identify duplicates in extensive file collections where precision isn't critical, and you only need a fast way to identify similar files
• Real-time Checksum Generation
  In applications where rapid data integrity checks are needed in real-time, "5um" could provide a balance between speed and simplicity
• Cache Key Generation
  If you wish to use a hash for caching and retrieving data, and security isn't a concern, "5um" could be suitable
• Search Algorithm Optimization
  Certain search algorithms, such as those based on hash tables, might benefit from a fast hash like "5um" to expedite the search process

Installation

1. Install the package

npm install 5um

2. Compile the c function for your architecture

gcc -o ./node_modules/5um/dist/c/hash5um.so -shared -fPIC ./node_modules/5um/src/c/hash5um.c

Usage

• As a system command

npx 5um hello.txt

• As a module

const hash5um = require("5um");

const inputFile = process.argv[2];
const hash = hash5um('./hello.txt'); // returns a BigInt

console.log(hash.toString(16));

// npm install --save-dev @types/ffi-napi

import hash5um from "5um";

const inputFile = process.argv[2];
const hash = hash5um('./hello.txt'); // returns a BigInt

console.log(hash.toString(16));

Characteristics

• Fast
• Easy to use
• Insecure
• Reversible
• Predictable
• Collisions