Pascal (Lazarus/Delphi)

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Email,
  Chilkat.Cert;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  email: TEmail;
  cert: TCert;

begin
  success := False;

  //  Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
  //  access to its private key) for decrypting a received encrypted email.  Set the cert
  //  before loading the encrypted email so it can be decrypted automatically.

  email := TEmail.Create;

  //  Load a certificate together with its private key from a PFX file.
  cert := TCert.Create;
  success := cert.LoadPfxFile('qa_data/certs/decryption.pfx','pfx_password');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Provide the certificate to use for decryption.
  success := email.SetDecryptCert(cert);
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Load the encrypted email; Chilkat decrypts it using the certificate.
  success := email.LoadEml('qa_data/eml/encrypted.eml');
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  WriteLn('ReceivedEncrypted = ' + email.ReceivedEncrypted);
  WriteLn('Decrypted = ' + email.Decrypted);

  //  Note: Paths such as "qa_data/..." are relative local filesystem paths,
  //  relative to the current working directory of the running application.


  email.Free;
  cert.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.