Dart

URL Signing for Google Maps API

See more Encryption Examples

Demonstrates how to sign a URL for the Google Maps API. 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();

  // The output will be modified Base64.
  // Modified Base64 for URLs replaces the '+' and '/' characters 
  // of standard Base64 with '-' and '_' respectively, so that these 
  // Base64 signatures no longer need to be URL-encoded.
  crypt.encodingMode = 'modBase64';

  // Set the hash algorithm to sha-1
  crypt.hashAlgorithm = 'sha-1';
  crypt.macAlgorithm = 'hmac';

  // Set the HMAC key (this is the private key provided by Google)
  crypt.setMacKeyEncoded('vNIXE0xscrmjlyV-12Nj_BvUPaw=', 'modBase64');

  // Compute the URL signature
  final sig = crypt.macStringENC('/maps/api/geocode/json?address=New+York&sensor=false&client=clientID');

  // The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
  print(sig);
}