(Delphi DLL) 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.

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, MailMan, Cert, Email, CertStore;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mailman: HCkMailMan;
email: HCkEmail;
success: Boolean;
certStore: HCkCertStore;
cert: HCkCert;
cert2: HCkCert;

begin
// 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 := CkMailMan_Create();

// Set the SMTP server.
CkMailMan_putSmtpHost(mailman,'smtp.mymailserver.com');

// Create a new email object
email := CkEmail_Create();

CkEmail_putSubject(email,'This email is signed');
CkEmail_putBody(email,'This is a digitally signed mail');
CkEmail_putFrom(email,'Chilkat Admin <admin@chilkatsoft.com>');
success := CkEmail_AddTo(email,'Chilkat Support','support@chilkatsoft.com');

// Indicate that the email should be sent signed.
CkEmail_putSendSigned(email,True);

// 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 := CkCertStore_Create();
// The 1st argument is the path of the PFX file, the 2nd arg is the 
// PFX file's password:
success := CkCertStore_LoadPfxFile(certStore,'/pfx_files/chilkatsoft_secret.pfx','secret');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCertStore__lastErrorText(certStore));
    Exit;
  end;

cert := CkCertStore_FindCertBySubjectE(certStore,'admin@chilkatsoft.com');
if (CkCertStore_getLastMethodSuccess(certStore) = False) then
  begin
    Memo1.Lines.Add(CkCertStore__lastErrorText(certStore));
    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 := CkCert_Create();
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
success := CkCert_LoadPfxFile(cert2,'/pfx_files/chilkatsoft_secret.pfx','secret');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert2));
    CkCert_Dispose(cert);
    Exit;
  end;

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

// 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..
CkMailMan_putOpaqueSigning(mailman,False);

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

CkCert_Dispose(cert);

CkMailMan_Dispose(mailman);
CkEmail_Dispose(email);
CkCertStore_Dispose(certStore);
CkCert_Dispose(cert2);

end;