(Delphi ActiveX) Decrypt2

Demonstrates how to decrypt MIME using a certificate and private key where the certificate and its corresponding private key are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mime: TChilkatMime;
cert: TChilkatCert;
success: Integer;
privKey: TPrivateKey;

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

mime := TChilkatMime.Create(Self);

// Load the certificate from a .cer file.
cert := TChilkatCert.Create(Self);
success := cert.LoadFromFile('aaworkarea/myCert.cer');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Load the private key from an encrypted PEM file.
// (A private key can be loaded from other file formats also..)
privKey := TPrivateKey.Create(Self);
success := privKey.LoadEncryptedPemFile('aaworkarea/myPrivateKey.pem','myPassword');
if (success = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;
success := mime.LoadMimeFile('aaworkarea/encryptedMime.txt');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

// Decrypt using the cert and associated private key
success := mime.Decrypt2(cert.ControlInterface,privKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

// Save the S/MIME to a file.
success := mime.SaveMime('aaworkarea/decryptedMime.txt');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('success!');
end;