Delphi ActiveX

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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var
success: Integer;
email: TChilkatEmail;
cert: TChilkatCert;

begin
success := 0;

//  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 := TChilkatEmail.Create(Self);

//  Load a certificate together with its private key from a PFX file.
cert := TChilkatCert.Create(Self);
success := cert.LoadPfxFile('qa_data/certs/decryption.pfx','pfx_password');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

//  Provide the certificate to use for decryption.
success := email.SetDecryptCert(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

//  Load the encrypted email; Chilkat decrypts it using the certificate.
success := email.LoadEml('qa_data/eml/encrypted.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('ReceivedEncrypted = ' + IntToStr(Ord(email.ReceivedEncrypted)));
Memo1.Lines.Add('Decrypted = ' + IntToStr(Ord(email.Decrypted)));

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