Node.js Crypto

Node.js Crypto

The Node.js Crypto module is a powerful tool that provides cryptographic functionalities. It offers a set of wrappers for OpenSSL’s features, including hash, HMAC, cipher, decipher, sign, and verify functions. With it, you can implement secure data handling in your applications.

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What is Hash?

A hash is a fixed-length string of bits generated procedurally and deterministically from an arbitrary block of input data. Regardless of the input size, the output remains consistent in length. Hashing is widely used for data integrity and password security.

What is HMAC?

HMAC stands for Hash-based Message Authentication Code. It combines a cryptographic hash function with a secret key, ensuring both data integrity and authenticity. The result is a unique hash that cannot be recreated without the original key.

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Encryption Example using Hash and HMAC

File: crypto_example1.js

const crypto = require('crypto');  
const secret = 'abcdefg';  
const hash = crypto.createHmac('sha256', secret)  
                   .update('Welcome to UpdateGadh')  
                   .digest('hex');  
console.log(hash);  

Run the code in the Node.js command prompt:

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node crypto_example1.js

Output: Node.js crypto example 1

Encryption Example using Cipher

File: crypto_example2.js

const crypto = require('crypto');  
const cipher = crypto.createCipher('aes192', 'a password');  
let encrypted = cipher.update('Hello UpdateGadh', 'utf8', 'hex');  
encrypted += cipher.final('hex');  
console.log(encrypted);  

Run the code in the Node.js command prompt:

node crypto_example2.js

Output: Node.js crypto example 2

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Decryption Example using Decipher

File: crypto_example3.js

const crypto = require('crypto');  
const decipher = crypto.createDecipher('aes192', 'a password');  
const encrypted = '4ce3b761d58398aed30d5af898a0656a3174d9c7d7502e781e83cf6b9fb836d5';  
let decrypted = decipher.update(encrypted, 'hex', 'utf8');  
decrypted += decipher.final('utf8');  
console.log(decrypted);  

Run the code in the Node.js command prompt:

node crypto_example3.js

Output: Node.js crypto example 3

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