(Delphi ActiveX) Create PKCS7 Signed File (.p7m)

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature.

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;
certStore: TChilkatCertStore;
success: Integer;
cert: IChilkatCert;
inFile: WideString;
outFile: WideString;

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

crypt := TChilkatCrypt2.Create(Self);

certStore := TChilkatCertStore.Create(Self);

// Load a PFX file into a certificate store object.
success := certStore.LoadPfxFile('myPfx.pfx','pfxPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Get the certificate by subject common name.
// This should be the cert within the PFX that also
// has a private key (also stored within the PFX).
cert := certStore.FindCertBySubjectCN('myCert');
if (certStore.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Tell the crypt object to use the certificate for signing:
success := crypt.SetSigningCert(cert);

// Sign a file, producing a .p7m as output.
// The input file is unchanged, the test.p7m contains the 
// contents of the input file and the signature.
inFile := 'test.txt';
outFile := 'testp7m';
success := crypt.CreateP7M(inFile,outFile);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Success!');
end;