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NodeJS-interview-questions-intermediate--->View question

How to generate and verify checksum of the given string in Nodejs ?

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Asked On2022-01-28 11:06:23 by:Akhil-Dev-D

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The checksum (aka hash sum) calculation is a one-way process of mapping an extensive data set of variable length (e.g., message, file), to a smaller data set of a fixed length (hash). The length depends on a hashing algorithm.

For the checksum generation, we can use node crypto() module. The module uses createHash(algorithm) to create a checksum (hash) generator. The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform.

Example:

const crypto = require('crypto');

// To get a list of all available hash algorithms
crypto.getHashes() // [ 'md5', 'sha1', 'sha3-256', ... ]

  
// Create hash of SHA1 type
const key = "MY_SECRET_KEY";


// 'digest' is the output of hash function containing  
// only hexadecimal digits
hashPwd = crypto.createHash('sha1').update(key).digest('hex');
  
console.log(hashPwd); //ef5225a03e4f9cc953ab3c4dd41f5c4db7dc2e5b

Answerd on:2022-01-31 Answerd By:Raj-Gupta

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