testingEncryptionString.dart

import "package:encrypt/encrypt.dart";
import "dart:convert";

class _encryption {
  static int theKeyLength = 32;
  static int theLengthOfInitialisationVector = 16;
  static var key = Key.fromLength(theKeyLength);
  static var iv = IV.fromLength(theLengthOfInitialisationVector);
  static var AESENCRYPTOR = Encrypter(AES(key));

  // AES-Symmetric, padding: random
  encrypt_string(String sendMessage) {
    var encrypted = AESENCRYPTOR.encrypt(sendMessage, iv:iv);
    String encryptedHashes = encrypted.base64;
    decrypt_string(encrypted);
    return encryptedHashes;
  }

  decrypt_string(var encrypted) {
    var decrypted = AESENCRYPTOR.decrypt(encrypted, iv:iv);
    String DecryptedHashes = decrypted;
    return DecryptedHashes;
  }
}

void main () {
  _encryption test = new _encryption();
  var a = test.encrypt_string("hahslkjdflkjsdflksjdflksjdfslkdfjsldkfjah");
  List <int> b = utf8.encode(a);
  print(a); 
  print(b);
}