Delphi DLL

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
strToSign: PWideChar;
key: PWideChar;
expectedResult: PWideChar;
mac: PWideChar;

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

crypt := CkCrypt2_Create();

strToSign := 'Sample #1';

// 64-byte key
key := '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f';

// The expected result:
// (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
expectedResult := '4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a';

// Here is the code to duplicate the results:
CkCrypt2_putHashAlgorithm(crypt,'sha-1');
CkCrypt2_putEncodingMode(crypt,'hex');
CkCrypt2_putMacAlgorithm(crypt,'hmac');

CkCrypt2_SetMacKeyEncoded(crypt,key,'hex');

mac := CkCrypt2__macStringENC(crypt,strToSign);

Memo1.Lines.Add('Computed: ' + mac);
Memo1.Lines.Add('Expected: ' + expectedResult);

CkCrypt2_Dispose(crypt);

end;