Swift

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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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
    }

    //  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).
    var preferPkcs1: Bool = false
    let bd = CkoBinData()!
    success = pubKey.getDerBd(preferPkcs1: preferPkcs1, bd: bd)
    if success == false {
        print("\(pubKey.lastErrorText!)")
        return
    }

    print("Exported \(bd.numBytes.intValue) DER bytes.")

}