How to create token using Hmac in Node js

Question

I am trying to convert Java code to Node js to generate token using Hmac. Java code-

Mac mac = Mac.getInstance("HmacSHA256")
SecretKeySpec key = new SecretKeySpec(mysecret.getBytes("UTF-8","HmacSHA256")
mac.init(key)
byte[] hash = mac.doFinal(texttoEncode.getBytes(UTF-8))

Can anyone please suggest what will be its Javascript /node js equivalent.

Adam Azad · Accepted Answer · 2020-07-31 09:32:48Z

4

The crypto built-in module provides createHmac method with the following signature:

crypto.createHmac(algorithm, key[, options])

To create a token:

const Crypto = require('crypto');

const token = Crypto.createHmac('sha256', 'a secret').update('data').digest('hex');

console.log(token); // 5da263f0f0ee86707c7c3f590d20066b7107e5ac70a41560926fa634bc78b137

edited Jul 31, 2020 at 9:32

answered Jul 31, 2020 at 9:27

Adam Azad

11.3k5 gold badges31 silver badges74 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

bhanu Over a year ago

Hi Adam, In Java code they are passing bytes array to dofinal, but in createhmac update we can only pass string. And the output is not same when I am passing string in update function

Adam Azad Over a year ago

@bhanu, update accept a BinaryLike argument. You can create that DS using Buffer.

jiangjingscom Over a year ago

yeah, Crypto.createHmac('sha256', 'a secret').update('data').digest('hex') will get a string.if want a array , try Crypto.createHmac('sha256', 'a secret').update('data').digest() @bhanu

bhanu Over a year ago

Thanks Adam passing buffer fixed the issue.

Collectives™ on Stack Overflow

How to create token using Hmac in Node js

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related