Dart

AES Encrypt String (utf-8 byte representation) and return Base64

See more Encryption Examples

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final crypt = CkCrypt2();

  crypt.cryptAlgorithm = 'aes';
  crypt.cipherMode = 'cbc';
  crypt.keyLength = 256;
  crypt.charset = 'utf-8';
  crypt.encodingMode = 'base64';

  final ivHex = '000102030405060708090A0B0C0D0E0F';
  crypt.setEncodedIV(ivHex, 'hex');
  final keyHex = '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F';
  crypt.setEncodedKey(keyHex, 'hex');

  final encryptedStr = crypt.encryptStringENC('This is the original string');
  print(encryptedStr);

  // Let's say we want to URL encode the base64 string..
  crypt.cryptAlgorithm = 'none';
  crypt.encodingMode = 'url';
  final urlEncoded = crypt.encryptStringENC(encryptedStr);
  print(urlEncoded);

  // Sample output:

  //  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
  //  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

  // -------------------------------------------------------------------
  // Now let's do the reverse...
  // 

  // We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
  final encBase64Url = 'q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D';

  // We'll use the same crypt object.  If using a new instance of the crypt object,
  // make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

  // Decode from URL...
  crypt.cryptAlgorithm = 'none';
  crypt.encodingMode = 'url';
  final encBase64 = crypt.decryptStringENC(urlEncoded);
  print(encBase64);

  // Now decrypt...
  crypt.cryptAlgorithm = 'aes';
  crypt.encodingMode = 'base64';
  final originalStr = crypt.decryptStringENC(encBase64);
  print(originalStr);
}