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Export a Public Key as DER into a BinData

Demonstrates the Chilkat PublicKey.GetDerBd method, which writes the public key as binary DER into a BinData. The first argument selects the representation (as for GetPem) and the second is the BinData that receives the bytes (its contents are replaced).

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: The in-memory binary export: the raw DER lands in a BinData ready to hash, transmit, or hand to another API without a temporary file. It is the BinData counterpart to the text exporters, and the first argument picks the same PKCS #1 versus SubjectPublicKeyInfo structure.

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Local $bSuccess = False

;  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
;  JWK, and other supported representations.
$oPubKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oPubKey.LoadFromFile("qa_data/public.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

;  Write the public key as binary DER into a BinData.  The 1st argument selects the representation
;  (as for GetPem) and the 2nd is the BinData that receives the bytes (its contents are replaced).
Local $bPreferPkcs1 = False
$oBd = ObjCreate("Chilkat.BinData")
$bSuccess = $oPubKey.GetDerBd($bPreferPkcs1,$oBd)
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

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