Node.js – hmac.digest() Method

Node.js Server Side Programming Programming

The Hmac class is one of the many utility classes that is used for creating the cryptographic HMAC digests. The Hmac.digest() method is used for calculating all the data that is updated using the Hmac.update() method. If encoding is provided, a string will be returned, else a buffer is returned.

Syntax

hmac.digest( [encoding] )

Parameters

encoding − This input parameter takes input for the encoding to be considered while calculating hmac.

Example 1

Create a file "hmacDigest.js" and copy the following code snippet. After creating the file use, use the command "node hmacDigest.js" to run this code.

Live Demo

// Hmac.digest() Demo Example

// Importing the crypto module
const crypto = require("crypto")

// Initializing the Hmac object with encoding and key
const hmac = crypto.createHmac('sha256', 'secretKey');

// Updating hmac with below data
hmac.update('Welcome to Tutorials point');

// Printing the hmac value using digests
console.log("Hmac is: " + hmac.digest('hex'))

Output

C:\home\node>> node hmacDigest.js
Hmac is: 4e6fa9b98ed4c498a498148bd720cc7b14b40b148e5b919bc89869b8c5dd5c9e

Example 2

Live Demo

// Hmac.digest() Demo Example

// Importing the crypto module
const crypto = require("crypto")

// Initializing the Hmac object with encoding and key
const hmac = crypto.createHmac('sha256', 'secretKey');

// Defining the hmac encoding algorithm
var encoding = "sha256"

// Defining the secret key
var secretKey = "1234567890"

// Defining the data to be hashed
var data = "TutorialsPoint"

// Creating the Hmac in hex encoding
let hmacDigest = crypto.createHmac(encoding, secretKey).update(data).digest("hex")

// Creating the Hmac in base64 encoding
let hmacDigestWithBase64 = crypto.createHmac(encoding, secretKey).update(data).digest("base64")

// Printing the Hmac value using digests
console.log("Hmac in Hex is: " + hmacDigest)
console.log("Hmac in Base64 encoding: " + hmacDigestWithBase64)

Output

C:\home\node>> node hmacDigest.js
Hmac in Hex is: 05fa1c5566678274ca0a4db70b0522cbb765140fa5903fbd42c1eac8682538dd
Hmac in Base64 encoding: BfocVWZngnTKCk23CwUiy7dlFA+lkD+9QsHqyGglON0=

Mayank Agarwal

Published on 16-Aug-2021 12:07:48

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