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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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Local $bSuccess = False

;  Load a private key to export.
$oPrivKey = ObjCreate("Chilkat.PrivateKey")
$bSuccess = $oPrivKey.LoadPemFile("qa_data/private.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

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

;  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (True) versus PKCS #8
;  (False); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
;  BinData that receives the DER bytes.
Local $bUsePkcs1 = False
$oBd = ObjCreate("Chilkat.BinData")
$bSuccess = $oPrivKey.GetPkcsBd($bUsePkcs1,$sPassword,$oBd)
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Exported " & $oBd.NumBytes & " DER bytes." & @CRLF)