Swift

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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Swift


func chilkatTest() {
    var success: Bool = false

    //  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
    //  JWK, and other supported representations.
    let pubKey = CkoPublicKey()!
    success = pubKey.load(fromFile: "qa_data/public.pem")
    if success == false {
        print("\(pubKey.lastErrorText!)")
        return
    }

    //  Export the public key in PEM format.  The argument selects the underlying DER representation:
    //  true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.
    var preferPkcs1: Bool = false
    var pem: String? = pubKey.getPem(preferPkcs1: preferPkcs1)
    if pubKey.lastMethodSuccess == false {
        print("\(pubKey.lastErrorText!)")
        return
    }

    print("\(pem!)")

}