(Swift) Generate an RSA Key and Save to Encrypted PEM

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Demonstrates how to generate an RSA key and save to an encrypted PEM file.

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func chilkatTest() {
    let rsa = CkoRsa()!

    // Generate a 2048-bit key.
    var success: Bool = rsa.generateKey(2048)
    if success == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    var privKey: CkoPrivateKey? = rsa.exportPrivateKeyObj()
    var password: String? = "secret"
    // Saving to a relative path (from the current working directory of the process).
    var path: String? = "rsaKeys/myTestRsaPrivate.pem"
    // Encrypt the PEM using 256-bit AES encryption.
    privKey.pkcs8EncryptAlg = "aes256"
    success = privKey!.savePkcs8EncryptedPemFile(password, path: path)
    if success == false {
        print("\(privKey!.lastErrorText!)")
        return
    }

    privKey = nil

    // 

    // We can also save the public key.
    // There is no need to encrypt public keys.
    var pubKey: CkoPublicKey? = rsa.exportPublicKeyObj()
    path = "rsaKeys/myTestRsaPublic.pem"
    // Choose PKCS1 or PKCS8
    // We'll choose PKCS8.
    var preferPkcs1: Bool = false
    success = pubKey!.savePemFile(preferPkcs1, path: path)
    if success == false {
        print("\(pubKey!.lastErrorText!)")
        return
    }

    pubKey = nil

    // 

    print("Success.")

}