(Delphi DLL) POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

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, StringArray, Cert, Email;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mailman: HCkMailMan;
success: Boolean;
sa: HCkStringArray;
email: HCkEmail;
uidl: PWideChar;
i: Integer;
cert: HCkCert;

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

mailman := CkMailMan_Create();

// Set the POP3 server's hostname
CkMailMan_putMailHost(mailman,'pop.someMailServer.com');

// Set the POP3 login/password.
CkMailMan_putPopUsername(mailman,'myLogin');
CkMailMan_putPopPassword(mailman,'myPassword');

sa := CkMailMan_GetUidls(mailman);
if (CkMailMan_getLastMethodSuccess(mailman) = False) then
  begin
    Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
    Exit;
  end;

i := 0;
while i < CkStringArray_getCount(sa) do
  begin

    uidl := CkStringArray__getString(sa,i);

    email := CkMailMan_FetchEmail(mailman,uidl);
    if (CkMailMan_getLastMethodSuccess(mailman) = False) then
      begin
        Memo1.Lines.Add(CkMailMan__lastErrorText(mailman));
        CkStringArray_Dispose(sa);
        Exit;
      end;

    Memo1.Lines.Add(CkEmail__from(email));
    Memo1.Lines.Add(CkEmail__subject(email));

    // The security layers of signed and/or encrypted emails
    // are automatically "unwrapped" when loaded into
    // a Chilkat email object.
    // An application only needs to check to see if an email
    // was received signed or encrypted, and then examine
    // the success/failure.  For example:
    if (CkEmail_getReceivedSigned(email) = True) then
      begin

        Memo1.Lines.Add('This email was signed.');

        // Check to see if the signatures were verified.
        if (CkEmail_getSignaturesValid(email) = True) then
          begin
            Memo1.Lines.Add('Digital signature(s) verified.');
            Memo1.Lines.Add('Signer: ' + CkEmail__signedBy(email));

            // The certificate used for signing may be obtained
            // by calling email.GetSignedByCert.

            cert := CkEmail_GetSignedByCert(email);
            if (CkEmail_getLastMethodSuccess(email) = False) then
              begin
                Memo1.Lines.Add('Failed to get signing certificate object.');
              end
            else
              begin
                Memo1.Lines.Add('Signing cert: ' + CkCert__subjectCN(cert));
                CkCert_Dispose(cert);
              end;

          end
        else
          begin
            Memo1.Lines.Add('Digital signature verification failed.');
          end;

      end;
    CkEmail_Dispose(email);
    i := i + 1;
  end;

CkStringArray_Dispose(sa);

CkMailMan_Pop3EndSession(mailman);

CkMailMan_Dispose(mailman);

end;