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Export a Public Key as PEM

Demonstrates the Chilkat PublicKey.GetPem method, which returns the public key in PEM format. The only argument selects the underlying DER representation: true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.

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: PEM is the most portable way to share a public key — the Base64 text block most tooling reads. The boolean picks the encoding: false produces the modern, algorithm-independent PUBLIC KEY (SubjectPublicKeyInfo), which is the usual choice; true produces the older RSA-specific RSA PUBLIC KEY for tools that require it. A public key is not sensitive, so the PEM can be distributed openly.

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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

;  Export the public key in PEM format.  The argument selects the underlying DER representation:
;  True prefers the traditional PKCS #1 form (RSA), False uses the SubjectPublicKeyInfo form.
Local $bPreferPkcs1 = False
Local $sPem = $oPubKey.GetPem($bPreferPkcs1)
If ($oPubKey.LastMethodSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($sPem & @CRLF)