the hmac is empty object var hmacSHA256 = crypto.createHmac({ algorithm: crypto.HashAlg.SHA256, key: secretKey }); why is that

AI generated answer (using internal Slack threads):

The HMAC object is empty because the

crypto.createHmac

function in NetSuite's SuiteScript expects a secret key that is stored in NetSuite's secrets management, not a dynamically computed key. In the context of AWS4 authentication, the secret key is not static but is dynamically generated based on elements of the request (like date, service name, etc.). This is why the HMAC object is empty when you try to use

crypto.createHmac

with a dynamically computed key. Here is an example of how you can generate the AWS signature using CryptoJS:

javascript
function getAWSSignatureKey(key, dateStamp, regionName, serviceName) {
    var kDate = CryptoJS.HmacSHA256(dateStamp, "AWS4" + key);
    var kRegion = CryptoJS.HmacSHA256(regionName, kDate);
    var kService = CryptoJS.HmacSHA256(serviceName, kRegion);
    var kSigning = CryptoJS.HmacSHA256("aws4_request", kService);
    return kSigning;
}

And here is how you can call this function:

javascript
var signing_key = CryptoJS.getAWSSignatureKey(secret_key, datestamp, region, service);
var signingsha256Data = CryptoJS.createHmacSHA256Crypto(string_to_sign, signing_key)
var signature = CryptoJS.HmacSHA256ToHexCrypto(signingsha256Data);

****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******