Delphi ActiveX

Duplicate OpensSSL to Create Signature using Cert and Key Files

See more OpenSSL Examples

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

Delphi ActiveX

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
success: Integer;
crypt: TChilkatCrypt2;
cert: TChilkatCert;
bd: TChilkatBinData;
privkey: TPrivateKey;

begin
success := 0;

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

crypt := TChilkatCrypt2.Create(Self);

// Load the cert and private key from separate files.
cert := TChilkatCert.Create(Self);
success := cert.LoadFromFile('myCert.crt');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

bd := TChilkatBinData.Create(Self);
success := bd.LoadFile('cert.key');
privkey := TPrivateKey.Create(Self);
// Load from any format private key.
// If the file does not need a password, the 2nd arg is ignored.
success := privkey.LoadAnyFormat(bd.ControlInterface,'password_if_needed');
if (success <> 1) then
  begin
    Memo1.Lines.Add(privkey.LastErrorText);
    Exit;
  end;

success := crypt.SetSigningCert2(cert.ControlInterface,privkey.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
success := crypt.CreateP7M('qa_data/infile.anything','qa_output/outfile.der');
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

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