Delphi ActiveX Requires Chilkat v10.1.2+

Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. Delphi ActiveX

var
success: Integer;
mailman: TChilkatMailMan;
email: TChilkatEmail;
certStore: TChilkatCertStore;
jsonE: TChilkatJsonObject;
cert: TChilkatCert;
cert2: TChilkatCert;

begin
success := 0;

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

//  The mailman object is used for sending and receiving email.
mailman := TChilkatMailMan.Create(Self);

//  Set the SMTP server.
mailman.SmtpHost := 'smtp.mymailserver.com';

//  Create a new email object
email := TChilkatEmail.Create(Self);

email.Subject := 'This email is signed';
email.Body := 'This is a digitally signed mail';
email.From := 'Chilkat Admin <admin@chilkatsoft.com>';
success := email.AddTo('Chilkat Support','support@chilkatsoft.com');

//  Indicate that the email should be sent signed.
email.SendSigned := 1;

//  Load a PFX file into a certificate store object.
//  Then locate the certificate matching the  sender's email address,
//  and use it for signing.
//  (a PFX file may contain more than one certificate.)
certStore := TChilkatCertStore.Create(Self);
//  The 1st argument is the path of the PFX file, the 2nd arg is the 
//  PFX file's password:
success := certStore.LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

//  Find the certificate for the email address:
jsonE := TChilkatJsonObject.Create(Self);
jsonE.UpdateString('email','admin@chilkatsoft.com');

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

//  Alternatively, if a PFX file is known to contain a single certificate,
//  you may load it directly into a Chilkat certificate object.
//  This snippet of source code shows how:
cert2 := TChilkatCert.Create(Self);
//  The 1st argument is the filename, the 2nd arg is the 
//  PFX file's password:
success := cert2.LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert2.LastErrorText);
    Exit;
  end;

//  This example will use the cert from the certStore...
success := email.SetSigningCert(cert.ControlInterface);

//  Signed email can be sent in two different ways.  
//  In a multipart/signed email, the signature is attached as a separate MIME part.
//  In an opaque email (signedData) the content of the email is encapsulated within the signature
//  and the email is sent as "application/pkcs7-mime". 
//  Either should be fine, but some receiving systems might require one or the other..
mailman.OpaqueSigning := 0;

//  Send a signed email.
success := mailman.SendEmail(email.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
  end
else
  begin
    //  The LastErrorText property provides information
    //  even when successful.
    Memo1.Lines.Add(mailman.LastErrorText);
    Memo1.Lines.Add('Mail Sent!');
  end;