Web Crypto API using Microsoft Edge (38.14393.0.0)

I have been using the Web Crypto API ( https://www.w3.org/TR/WebCryptoAPI/ ) successfully in Chrome (since the first Crypto support), Firefox (since the first Web Crypto support) and even on Safari TP (10.2) since WebCrypto Liner support - pollyfill for WebCrypto API ( https://github.com/PeculiarVentures/webcrypto-liner ).

Now I want to test our code using Microsoft Edge. But encryption and decryption of the ArrayBuffer pattern no longer succeeds. Here's the code:

var crypto = window.crypto;
if (crypto.subtle) {
    var aesGcmKey = null;
    // always create a new, random iv in production systems!!!
    var tempIv = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
    // needed for edge, if additional data missing decrypting is failing
    var tempAdditionalData = new Uint8Array(0);
    var dataToEncrypt = new Uint8Array([1, 2, 3, 4, 5]);

    // 1.) generate key
    var generateKeyPromise = crypto.subtle.generateKey(
        {name: "AES-GCM", length: 256}, true, ["encrypt", "decrypt"]
    );
    generateKeyPromise.then(function (tempKey) {
        aesGcmKey = tempKey;
        // 2.) start encryption with this key
        var encryptedDataPromise = crypto.subtle.encrypt(
            {name: "AES-GCM", iv: tempIv, additionalData: tempAdditionalData, tagLength: 128},
            aesGcmKey,
            dataToEncrypt
        );
        encryptedDataPromise.then(function (encryptedData) {
            // 3.) decrypt using same key
            var decryptedDataPromise = crypto.subtle.decrypt(
                {name: "AES-GCM", iv: tempIv, additionalData: tempAdditionalData, tagLength: 128},
                aesGcmKey,
                encryptedData
            );
            decryptedDataPromise.then(function (decryptedData) {
                // 4.) compare decrypted array buffer and inital data
                console.log('data decrypted!');
                console.log(decryptedData);
            });
            decryptedDataPromise.catch(function (error) {
                console.log('decrypting sample data failed');
                console.log(error);
            });
        });
        // if 2.) is failing
        encryptedDataPromise.catch(function (error) {
            console.log('encrypting sample data failed');
            console.log(error);
        });
    });
    // if 1.) is failing
    generateKeyPromise.catch(function (error) {
        console.log('creating aec gcm key failed');
        console.log(error);
    });
}

      

        
        
        
      

    

This code does not work in the decryption phase (step 3.in code) on Edge, while it works fine in Chrome, Firefox and even Safari. The wired part is that the decryptedDataPromise is rejected with an exception, but the returned data doesn't look like an exception at all:

[object Object] {additionalData: Uint8Array {...}, iv: Uint8Array {...}, name: "AES-GCM", tagLength: 128}

      

        
        
        
      

    

Does anyone know why this fails on Microsoft Edge?