Delphi DLL

Export a Private Key as DER into a BinData

Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

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Delphi DLL

var
success: Boolean;
privKey: HCkPrivateKey;
password: PWideChar;
usePkcs1: Boolean;
bd: HCkBinData;

begin
success := False;

//  Load a private key to export.
privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadPemFile(privKey,'qa_data/private.pem');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

//  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';

//  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (1) versus PKCS #8
//  (0); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
//  BinData that receives the DER bytes.
usePkcs1 := False;
bd := CkBinData_Create();
success := CkPrivateKey_GetPkcsBd(privKey,usePkcs1,password,bd);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;
Memo1.Lines.Add('Exported ' + IntToStr(CkBinData_getNumBytes(bd)) + ' DER bytes.');

CkPrivateKey_Dispose(privKey);
CkBinData_Dispose(bd);