title: How to decrypt of the encrypted value in dart?
body: <p>I am testing the Cryptographic hashing functions for Dart.  I can't find any information about DECRYPTION?
  Can anyone show me how to decryption of the encrypted value?</p>
  
  <p>And this is example;</p>
  
  <pre><code>import 'dart:convert';
  import 'package:crypto/crypto.dart'; 
  
  void main() async { 
    var key = utf8.encode('p@ssw0rd'); 
    var bytes = utf8.encode("Dart and Aqueduct makes my life easier. Thank you."); 
  
  
    // TODO: ENCRYPTION 
    var hmacSha256 = new Hmac(sha256, key); // HMAC-SHA256 
    var digest = hmacSha256.convert(bytes); 
   
    print(“————ENCRYPTION—————“); 
    print("HMAC digest as bytes: ${digest.bytes}"); 
    print("HMAC digest as hex string: $digest"); 
    print('\r\n'); 
  
  
    // TODO: DECRYPTION 
       ???????????? 
    print(“————DECRYPTION—————“); 
    print(?????????); 
  
  }
  </code></pre>