hmac.digest AN_ERROR_OCCURRED_WHILE_DECRYPT_PASSWORDGUID

I'm trying to create a Azure Security Access Token within SuiteScript.  I am getting AN_ERROR_OCCURRED_WHILE_DECRYPT_PASSWORDGUID when calling hmac.digest method in the below NetSuite Code.
The Netsuite code is based on code found on Microsoft website to do the same thing in Node.Js below.

Node.Js Code.

var generateSasToken = function(resourceUri, signingKey, policyName, expiresInMins) {      resourceUri = encodeURIComponent(resourceUri);        // Set expiration in seconds      var expires = (Date.now() / 1000) + expiresInMins * 60;      expires = Math.ceil(expires);      var toSign = resourceUri + 'n' + expires;        // Use crypto      var hmac = crypto.createHmac('sha256', new Buffer(signingKey, 'base64'));      hmac.update(toSign);      var base64UriEncoded = encodeURIComponent(hmac.digest('base64'));        // Construct autorization string      var token = "SharedAccessSignature sr=" + resourceUri + "&sig="      + base64UriEncoded + "&se=" + expires;      if (policyName) token += "&skn="+policyName;      return token;  };