digest is NOT a promise in IE11

javascript/src/utilities/signingUtilities.js

@@ -397,6 +397,7 @@ function createCertificate(certData, issuerData = null) {
   sequence = sequence.then(
     () =>{
       console.log('importing public key');
+      //IN IE11 this is NOT a PROMISE !!! but a Crypto Opearation Object
       return crypto.digest(
         { name: "SHA-1" },
         certificate.subjectPublicKeyInfo.subjectPublicKey.valueBlock.valueHex