Delphi DLL 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 DLL

var
success: Boolean;
mailman: HCkMailMan;
email: HCkEmail;
certStore: HCkCertStore;
jsonE: HCkJsonObject;
cert: HCkCert;
cert2: HCkCert;

begin
success := False;

//  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;

//  Find the certificate for the email address:
jsonE := CkJsonObject_Create();
CkJsonObject_UpdateString(jsonE,'email','admin@chilkatsoft.com');

cert := CkCert_Create();
success := CkCertStore_FindCert(certStore,jsonE,cert);
if (success = 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));
    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;

CkMailMan_Dispose(mailman);
CkEmail_Dispose(email);
CkCertStore_Dispose(certStore);
CkJsonObject_Dispose(jsonE);
CkCert_Dispose(cert);
CkCert_Dispose(cert2);