Pascal (Lazarus/Delphi)

URL Signing for Google Maps API

See more Encryption Examples

Demonstrates how to sign a URL for the Google Maps API. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  crypt: TCrypt2;
  sig: string;

begin
  //  This example assumes the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  crypt := TCrypt2.Create;

  //  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
  sig := crypt.MacStringENC('/maps/api/geocode/json?address=New+York&sensor=false&client=clientID');

  //  The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
  WriteLn(sig);


  crypt.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.