(Delphi DLL) Workaround for the deprecated Crypt2.OpaqueVerifyBytes method

Shows how to replace the deprecated OpaqueVerifyBytes method. (Chilkat is moving away from the use of CkByteData.)

Note: This example requires Chilkat v11.0.0 or greater.

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;
path: PWideChar;
inData: HCkByteData;
outData: HCkByteData;
bd: HCkBinData;
success: Boolean;

begin
crypt := CkCrypt2_Create();

path := 'c:/someDir/example.p7m';

// ------------------------------------------------------------------------
// The OpaqueVerifyBytes method is deprecated:

inData := CkByteData_Create();
CkByteData_loadFile(inData,path);

outData := CkByteData_Create();

success := CkCrypt2_OpaqueVerifyBytes(crypt,inData,outData);

// ------------------------------------------------------------------------
// Workaround.
// (Chilkat is moving away from using CkByteData)

bd := CkBinData_Create();
CkBinData_LoadFile(bd,path);

// If the opaque signature is validated, the contents of bd are replaced with the original data that was signed.
success := CkCrypt2_OpaqueVerifyBd(crypt,bd);

CkCrypt2_Dispose(crypt);
CkByteData_Dispose(inData);
CkByteData_Dispose(outData);
CkBinData_Dispose(bd);

end;