Crypto Module in Node.js

 crypto module in Node.js is native module,It provides cryptographic functionality

such as hash functions, encryption and decryption algorithms, digital signatures,

and more.

Some of the features provided by the crypto module include:

Hash functions: the module provides a range of hash functions such as

SHA-256, SHA-512, and MD5.

Encryption and decryption: the module provides algorithms for symmetric

encryption and decryption such as AES,

as well as asymmetric encryption and decryption such as RSA.

Digital signatures: the module provides functionality for generating

and verifying digital signatures

using algorithms such as RSA, DSA, and ECDSA.

crypto module in Node.js depends on OpenSSL, which is a widely used open

source library that provides cryptographic functions such as encryption,

decryption, and digital signature generation and verification.

OpenSSL is a third-party library that is not maintained by the Node.js project.

Example sha256

const crypto = require('crypto');

const data = 'Hello, world!';

// Create a hash object

const hash = crypto.createHash('sha256');

// Update the hash object with the data to be hashed

hash.update(data);

// Generate the hash as a hex string

const hashResult = hash.digest('hex');

console.log(`Hash of "${data}": ${hashResult}`);

output:

Hash of "Hello, world!": 315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3