Delphi ActiveX

Duplicate OpensSSL to Sign File and Output Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

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;
pem: TChilkatPem;
privkey: TPrivateKey;
cert: TChilkatCert;
certFromP12: TChilkatCert;

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 PEM containing cert + private key.
pem := TChilkatPem.Create(Self);
success := pem.LoadPemFile('qa_data/pem/myPem.pem','password');
if (success = 0) then
  begin
    Memo1.Lines.Add(pem.LastErrorText);
    Exit;
  end;

privkey := TPrivateKey.Create(Self);
success := pem.PrivateKeyAt(0,privkey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pem.LastErrorText);
    Exit;
  end;

cert := TChilkatCert.Create(Self);
success := pem.CertAt(0,cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(pem.LastErrorText);
    Exit;
  end;

success := crypt.SetSigningCert2(cert.ControlInterface,privkey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Alternatively, we could use a .pfx/.p12 file.
// (Chilkat also supports other formats/sources for cert/private keys...)
certFromP12 := TChilkatCert.Create(Self);
success := certFromP12.LoadPfxFile('qa_data/p12/myP12.p12','password');
if (success = 0) then
  begin
    Memo1.Lines.Add(certFromP12.LastErrorText);
    Exit;
  end;

// The certificate, when loaded from a .pfx/.p12, will automatically 
// include the associated private key, assuming it's present in the .p12.
// We don't have to explicitly provide the private key as in the
// lines of code above that use the PEM file.
success := crypt.SetSigningCert(certFromP12.ControlInterface);
if (success = 0) 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.p7m');
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

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