AES-GCM Encryption and Decryption Examples using Web Crypto (subtle.crypto) JavaScript API

aes-gcm.js

async function generateKey() {
  return await crypto.subtle.generateKey({
    "name":"AES-GCM",
    "length":256
  },true,['encrypt','decrypt']);
}

async function exportKey(key) {
  return await crypto.subtle.exportKey('jwk', key);
}

async function importKey(jwk) {
  return await crypto.subtle.importKey('jwk', jwk, {
    "name":"AES-GCM"
  }, false, ['encrypt','decrypt']);
}

async function encrypt(string,key) {
  let encoded = new TextEncoder().encode(string);
  let iv = crypto.getRandomValues(new Uint8Array(12));
  let encrypted = await crypto.subtle.encrypt({"name":"AES-GCM","iv":iv}, key, encoded);
  return encrypted = {"encrypted":encrypted, "iv": iv};
}

async function decrypt(encrypted,iv, key) {
  let decrypted = await crypto.subtle.decrypt({"name":"AES-GCM","iv":iv}, key, encrypted);
  let decoded = new TextDecoder().decode(decrypted);
  return decoded;
}

This is good sample, but AES-GCM crypto is not supported in Edge/IE11, do you know how to AES-GCM in Edge/IE11? Is there pure javascript code that doesn't rely on native crypto api ?

This is good sample, but AES-GCM crypto is not supported in Edge/IE11, do you know how to AES-GCM in Edge/IE11? Is there pure javascript code that doesn't rely on native crypto api ?

Maybe this can help:
https://stackoverflow.com/questions/41449185/how-to-decrypt-data-from-the-result-of-an-ie-11-encrypt-operation-using-aes-gcm