Generate a symmetric key, encrypt a message, export the key, import the key and decrypt the message

crypto.ts

// Temporary Encryption Demo
// 1. generate an encryption key
const algorithm = "AES-GCM";
const iv = window.crypto.getRandomValues(new Uint8Array(12));
crypto.subtle.generateKey(
  {
    name: algorithm,
    length: 256,
}, true, ['encrypt', 'decrypt']).then(key => {
    console.log('key', key);

    // Encrypt the users message
    const enc = new TextEncoder();
    const encoded = enc.encode("random message 123");
    crypto.subtle.encrypt({
      name: algorithm,
      iv,
    }, key, encoded).then(encrypted => {
      // Export the key to be shared
      crypto.subtle.exportKey('raw', key).then((exported) => {
        // Import the key
        const imported = crypto.subtle.importKey('raw', exported, algorithm, true, ['encrypt', 'decrypt']);
        imported.then(importedKey => {

          // decrypt the test message
          crypto.subtle.decrypt({
            name: algorithm,
            iv,
          }, importedKey, encrypted).then(decrypted => {
            const dec = new TextDecoder();
            const original = dec.decode(decrypted);
            console.log('decrypted:', original);
          });
        })
      });
    });
  })