(Delphi ActiveX) HOTP Algorithm: HMAC-Based One-Time Password Algorithm

Demonstrates how to generate an HMAC one-time password (HOTP) as specified in RFC 4226.

Note: This example requires Chilkat v9.5.0.77 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: TChilkatCrypt2;
secret: WideString;
count: Integer;
counterHex: WideString;
hotp: WideString;

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

crypt := TChilkatCrypt2.Create(Self);

// Duplicate the following results from RFC 4226

// Appendix D - HOTP Algorithm: Test Values
// 
//   The following test data uses the ASCII string
//   "12345678901234567890" for the secret:
// 
//   Secret = 0x3132333435363738393031323334353637383930
// 
//                     Truncated
//   Count    Hexadecimal    Decimal        HOTP
//   0        4c93cf18       1284755224     755224
//   1        41397eea       1094287082     287082
//   2         82fef30        137359152     359152
//   3        66ef7655       1726969429     969429
//   4        61c5938a       1640338314     338314
//   5        33c083d4        868254676     254676
//   6        7256c032       1918287922     287922
//   7         4e5b397         82162583     162583
//   8        2823443f        673399871     399871
//   9        2679dc69        645520489     520489

secret := '12345678901234567890';

for count := 0 to 9 do
  begin
    counterHex := crypt.EncodeInt(count,8,0,'hex');
    hotp := crypt.Hotp(secret,'ascii',counterHex,6,-1,'sha1');
    Memo1.Lines.Add(IntToStr(count) + '  HOTP = ' + hotp);
  end;

// Output is:
// 0  HOTP = 755224
// 1  HOTP = 287082
// 2  HOTP = 359152
// 3  HOTP = 969429
// 4  HOTP = 338314
// 5  HOTP = 254676
// 6  HOTP = 287922
// 7  HOTP = 162583
// 8  HOTP = 399871
// 9  HOTP = 520489
end;