(Delphi DLL) Demonstrates the MacBytes Method

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

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
sData: PWideChar;
dataToHmac: HCkByteData;
binData: HCkBinData;
macBytes: HCkByteData;

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 := CkCrypt2_Create();

CkCrypt2_putMacAlgorithm(crypt,'hmac');
CkCrypt2_putEncodingMode(crypt,'hex');
CkCrypt2_SetMacKeyString(crypt,'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
dataToHmac := CkByteData_Create();
binData := CkBinData_Create();
CkBinData_AppendString(binData,sData,'utf-8');
success := CkBinData_GetBinary(binData,dataToHmac);

macBytes := CkByteData_Create();

CkCrypt2_putHashAlgorithm(crypt,'SHA-256');
success := CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
CkBinData_Clear(binData);
CkBinData_AppendBinary(binData,macBytes);
Memo1.Lines.Add('HMAC_SHA256: ' + CkBinData__getEncoded(binData,'hex'));

CkCrypt2_putHashAlgorithm(crypt,'MD5');
success := CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
CkBinData_Clear(binData);
CkBinData_AppendBinary(binData,macBytes);
Memo1.Lines.Add('HMAC_MD5: ' + CkBinData__getEncoded(binData,'hex'));

CkCrypt2_putHashAlgorithm(crypt,'SHA-1');
success := CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
CkBinData_Clear(binData);
CkBinData_AppendBinary(binData,macBytes);
Memo1.Lines.Add('HMAC_SHA1: ' + CkBinData__getEncoded(binData,'hex'));

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

CkCrypt2_Dispose(crypt);
CkByteData_Dispose(dataToHmac);
CkBinData_Dispose(binData);
CkByteData_Dispose(macBytes);

end;