Function aesGcmDecrypt

aesGcmDecrypt<T>(ciphertext, password): Promise<T>
Decrypts ciphertext encrypted with aesGcmEncrypt() using supplied password. (c) Chris Veness MIT Licence

https://gist.github.com/chrisveness/43bcda93af9f646d083fad678071b90a Modified to work with Uint8Array and string content.
Type Parameters
- T extends string | Uint8Array
Parameters
- ciphertext: T
  Ciphertext to be decrypted.
- password: string | Uint8Array
  Password to use to decrypt ciphertext.
Returns Promise<T>
Decrypted content. If ciphertext is a string, the plaintext is a string. If ciphertext is a Uint8Array, the plaintext is a new Uint8Array.
Example
```
const plaintext = await aesGcmDecrypt(ciphertext, 'pw');
  aesGcmDecrypt(ciphertext, 'pw').then(function(plaintext) { console.log(plaintext); });
```