Dart

HMAC Hex String

See more Encryption Examples

Demonstrates how to compute an HMAC using a hexidecimal key and data. 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 HMAC
  crypt.macAlgorithm = 'hmac';

  // Our HMAC key will be the bytes represented in the following hex string.
  // In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
  // (It is not composed of the us-ascii string '4', '1', 'C', ...)
  final keyHex = '41C21CB9D7A02FC5D4FADB9E4755B9DE';
  crypt.setMacKeyEncoded(keyHex, 'hex');

  // Our desire is to HMAC the bytes represented in the following string:
  final dataHex = 'C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA';

  // We'll need to decode the hex to binary:
  final bd = CkBinData();
  bd.appendEncoded(dataHex, 'hex');

  // Do the HMAC-SHA256 hash and return as a hex string:
  crypt.encodingMode = 'hex';
  crypt.hashAlgorithm = 'sha-256';
  final macHex = crypt.macBdENC(bd);
  print(macHex);
}