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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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llSuccess = .F.

//  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
//  JWK, and other supported representations.
loPubKey = createobject("CkPublicKey")
llSuccess = loPubKey.LoadFromFile("qa_data/public.pem")
if (llSuccess = .F.) then
    ? loPubKey.LastErrorText
    release loPubKey
    return
endif

//  Export the public key in PEM format.  The argument selects the underlying DER representation:
//  .T. prefers the traditional PKCS #1 form (RSA), .F. uses the SubjectPublicKeyInfo form.
llPreferPkcs1 = .F.
lcPem = loPubKey.GetPem(llPreferPkcs1)
if (loPubKey.LastMethodSuccess = .F.) then
    ? loPubKey.LastErrorText
    release loPubKey
    return
endif

? lcPem


release loPubKey