Dart

AES-CMAC

See more Encryption Examples

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305.

Note: Chilkat added AES-CMAC in version 9.5.0.95.

Dart

import 'package:chilkat/chilkat.dart';

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

  final crypt = CkCrypt2();

  // Set the MAC algorithm to AES-CMAC
  crypt.macAlgorithm = 'aes-cmac';

  // AES-CMAC always uses a 16-byte (128-bit) MAC key.
  final keyHex = '2b7e151628aed2a6abf7158809cf4f3c';
  crypt.setMacKeyEncoded(keyHex, 'hex');

  // Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
  // Here we have 64 bytes in hex representation.
  final messageBytes = '6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710';

  final bd = CkBinData();
  bd.appendEncoded(messageBytes, 'hex');

  // Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
  crypt.encodingMode = 'hex_lower';
  final cmac = crypt.macBdENC(bd);
  print(cmac);
  // Output should be: 51f0bebf7e3b9d92fc49741779363cfe

  // Now do the same for a string:
  final plainText = '\'Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.';
  final encTag = crypt.macStringENC(plainText);
  print(encTag);

  // Output should be: 4fca1fcbd265048d247f99ab57fa3ceb
}