Xbase++

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 nSuccess
LOCAL oPubKey
LOCAL nPreferPkcs1
LOCAL oBd

nSuccess := 0

//  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
//  JWK, and other supported representations.
oPubKey := CreateObject("Chilkat.PublicKey")
nSuccess := oPubKey:LoadFromFile("qa_data/public.pem")
IF (nSuccess == 0)
    ? oPubKey:LastErrorText
    oPubKey:destroy()
    RETURN
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).
nPreferPkcs1 := 0
oBd := CreateObject("Chilkat.BinData")
nSuccess := oPubKey:GetDerBd(nPreferPkcs1, oBd)
IF (nSuccess == 0)
    ? oPubKey:LastErrorText
    oPubKey:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "Exported " + Str(oBd:NumBytes) + " DER bytes."

oPubKey:destroy()
oBd:destroy()