Visual FoxPro

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 lnSuccess
LOCAL loPubKey
LOCAL lnPreferPkcs1
LOCAL loBd

lnSuccess = 0

*  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
*  JWK, and other supported representations.
loPubKey = CreateObject('Chilkat.PublicKey')
lnSuccess = loPubKey.LoadFromFile("qa_data/public.pem")
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPubKey
    CANCEL
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).
lnPreferPkcs1 = 0
loBd = CreateObject('Chilkat.BinData')
lnSuccess = loPubKey.GetDerBd(lnPreferPkcs1,loBd)
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPubKey
    RELEASE loBd
    CANCEL
ENDIF

? "Exported " + STR(loBd.NumBytes) + " DER bytes."

RELEASE loPubKey
RELEASE loBd