Xbase++

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 nSuccess
LOCAL oPubKey
LOCAL nPreferPkcs1
LOCAL cPem

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

//  Export the public key in PEM format.  The argument selects the underlying DER representation:
//  1 prefers the traditional PKCS #1 form (RSA), 0 uses the SubjectPublicKeyInfo form.
nPreferPkcs1 := 0
cPem := oPubKey:GetPem(nPreferPkcs1)
IF (oPubKey:LastMethodSuccess == 0)
    ? oPubKey:LastErrorText
    oPubKey:destroy()
    RETURN
ENDIF

? cPem

oPubKey:destroy()