We have used below code for HMAC but getting  error as 256 bit require in datap[ower 
as per client requirement key should be "TEIFHEW" but same is  working online js complier but on datapower not working .

const crypto = require('crypto');

const secret = Buffer.from('TEIFHEW');
 
// Calling createHmac method

const hash = crypto.createHmac('sha256', secret).update('mayur').digest('base64');
 session.output.write(hash)
// Displays output
console.log(hash);

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mayur gharat
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Hi Mayur, 

it seems like the issue is that there is no padding for the key - you need to provide a 32 byte key. the folks here have used stuff like 

var encryptionKey = crypto.randomBytes(32);

you could also potentially create a crypto key object on the device and point to a text like 0x123 for a 256 bit key then reference the name of the object in the script.

We have used below code for HMAC but getting  error as 256 bit require in datap[ower 
as per client requirement key should be "TEIFHEW" but same is  working online js complier but on datapower not working .

const crypto = require('crypto');

const secret = Buffer.from('TEIFHEW');
 
// Calling createHmac method

const hash = crypto.createHmac('sha256', secret).update('mayur').digest('base64');
 session.output.write(hash)
// Displays output
console.log(hash);

------------------------------
mayur gharat
------------------------------