Delphi ActiveX

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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var
success: Integer;
imap: TChilkatImap;
bdPfx: TChilkatBinData;
pfxPassword: WideString;

begin
success := 0;

//  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
//  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
//  BinData containing the PFX, and the 2nd is the PFX password.

imap := TChilkatImap.Create(Self);

imap.Ssl := 1;
imap.Port := 993;

success := imap.Connect('imap.example.com');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;
success := imap.Login('user@example.com','myPassword');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

//  Load the PFX data into a BinData.
bdPfx := TChilkatBinData.Create(Self);
success := bdPfx.LoadFile('qa_data/smime.pfx');
if (success = 0) then
  begin
    Memo1.Lines.Add(bdPfx.LastErrorText);
    Exit;
  end;

//  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
//  interactive prompt, environment variable, or a secrets vault.

//  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
success := imap.AddPfxSourceBd(bdPfx.ControlInterface,pfxPassword);
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

//  Messages downloaded after this are automatically decrypted when a matching key is found.

success := imap.Disconnect();
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;