PowerBuilder

Save a Public Key as a DER File

Demonstrates the Chilkat PublicKey.SaveDerFile method, which saves the public key as binary DER. The first argument selects the representation (as for GetPem) and the second is the destination path.

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: DER is the compact binary encoding many libraries and protocols consume directly. Saving to a .der file is the choice when a consumer wants raw binary rather than Base64 PEM. The first argument picks the traditional (PKCS #1) versus modern (SubjectPublicKeyInfo) structure.

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integer li_rc
integer li_Success
oleobject loo_PubKey
integer li_PreferPkcs1

li_Success = 0

//  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
//  JWK, and other supported representations.
loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")
if li_rc < 0 then
    destroy loo_PubKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_PubKey.LoadFromFile("qa_data/public.pem")
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    return
end if

//  Save the public key as binary DER.  The 1st argument selects the representation and the 2nd is
//  the destination path.
li_PreferPkcs1 = 0
li_Success = loo_PubKey.SaveDerFile(li_PreferPkcs1,"qa_output/public.der")
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    return
end if

Write-Debug "Saved."


destroy loo_PubKey