(Delphi ActiveX) Demonstrates the MacBytesENC Method

Demonstrates the MacBytesENC method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5.

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;
sData: WideString;
dataToHmac: Array of Byte;
binData: TChilkatBinData;

begin
// This example assumes Chilkat Crypt2 to have been previously unlocked.
// See Unlock Crypt2 for sample code.

// Demonstrates how to reproduce the following results found at
// https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

// HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
// HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
// HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

crypt := TChilkatCrypt2.Create(Self);

crypt.MacAlgorithm := 'hmac';
crypt.EncodingMode := 'hex';
crypt.SetMacKeyString('key');
sData := 'The quick brown fox jumps over the lazy dog';

// We're doing this in a convoluted, roundabout fashion to show syntax
// and data types for handling binary data.
// The straightforward way of doing an HMAC on a string is
// shown here: HMAC String

binData := TChilkatBinData.Create(Self);
binData.AppendString(sData,'utf-8');
dataToHmac := binData.GetBinary();

crypt.HashAlgorithm := 'SHA-256';
Memo1.Lines.Add('HMAC_SHA256: ' + crypt.MacBytesENC(dataToHmac));

crypt.HashAlgorithm := 'MD5';
Memo1.Lines.Add('HMAC_MD5: ' + crypt.MacBytesENC(dataToHmac));

crypt.HashAlgorithm := 'SHA-1';
Memo1.Lines.Add('HMAC_SHA1: ' + crypt.MacBytesENC(dataToHmac));

// The output is the same (ignore case)
// HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
// HMAC_MD5: 80070713463E7749B90C2DC24911E275
// HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9
end;