(Swift 2) Load an Ed25519 Private Key from Hex

Demonstrates how to load an Ed25519 private key from raw hex bytes.

Note: This example requires Chilkat v9.5.0.83 or greater.

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let privKey = CkoPrivateKey()

    // We have the hexidecimal encoded bytes of the private key and public key:
    var privKeyHex: String? = "d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842"
    var pubKeyHex: String? = "19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1"

    // Load these values into the Chilkat private key object:
    var success: Bool = privKey.LoadEd25519(privKeyHex, pubKey: pubKeyHex)
    if success == false {
        print("\(privKey.LastErrorText)")
        return
    }

    // ---------------------------------------------------------------
    // We don't actually need the public key.  If we pass an empty string for the public key,
    // Chilkat will automatically compute it.
    let privKey2 = CkoPrivateKey()
    success = privKey2.LoadEd25519(privKeyHex, pubKey: "")

    // Let's get the public key to see that it computed the same value.
    let sbPubKeyHex = CkoStringBuilder()
    privKeyHex = privKey2.GetRawHex(sbPubKeyHex)
    print("computed public key = \(sbPubKeyHex.GetAsString())")

    // The output should be:
    // computed public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1

}