Delphi DLL

Load a Private Key from a File (Any Format)

Demonstrates the Chilkat PrivateKey.LoadAnyFormatFile method, which loads a private key from a file by inspecting its contents. The first argument is the file path and the second is the password (used if the detected key is encrypted).

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: This is the most convenient loader of all — point it at a key file whose format you do not know and it detects and loads it, whether PKCS #1/#8, encrypted PKCS #8, PEM, JWK, XML, or a Microsoft format. It is the pragmatic default for applications that accept keys from users or varied sources; use a format-specific loader only when you want to enforce a particular expected format.

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var
success: Boolean;
privKey: HCkPrivateKey;
password: PWideChar;

begin
success := False;

//  Demonstrates the PrivateKey.LoadAnyFormatFile method, which loads a private key from a file by
//  inspecting its contents.  The 1st argument is the file path and the 2nd is the password (used
//  if the detected key is encrypted).

privKey := CkPrivateKey_Create();

//  The key password is not hard-coded in a real application; obtain it from an interactive
//  prompt, environment variable, or a secrets vault.
password := 'myKeyPassword';

//  This is the most convenient loader when the file's exact format is unknown: Chilkat inspects
//  the content and handles PKCS #1/#8, encrypted PKCS #8, PEM, JWK, XML, Microsoft formats, etc.
success := CkPrivateKey_LoadAnyFormatFile(privKey,'qa_data/some_private_key',password);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

Memo1.Lines.Add('Loaded a ' + CkPrivateKey__keyType(privKey) + ' private key.');

CkPrivateKey_Dispose(privKey);