public protocol EllipticCurveCryptographyKeyGeneration {
    /// Elliptic Curve used, e.g. `secp256k1`
    associatedtype CurveType: EllipticCurve

    /// Generates a new key pair (PrivateKey and PublicKey)
    static func generateNewKeyPair() -> KeyPair<CurveType>

    /// Support Wallet Import Format (a.k.a. WIF)
    static func restoreKeyPairFrom(privateKey: PrivateKey<CurveType>) -> KeyPair<CurveType>

    /// A `Wallet` is a `KeyPair` and with `PublicAddresses` derived (compressed/uncompressed)
    static func createWallet(using keyPair: KeyPair<CurveType>) -> Wallet<CurveType>
}

public protocol EllipticCurveCryptographySigning {
    /// Which method to use for signing, e.g. `Schnorr`
    associatedtype SigningMethodUsed: Signing
    typealias CurveType = SigningMethodUsed.CurveType

    /// Signs `message` using `keyPair`
    static func sign(_ message: Message, using keyPair: KeyPair<CurveType>) -> SignatureType

    /// Checks if `signature` is valid for `message` or not.
    static func verify(_ message: Message, wasSignedBy signature: SignatureType, publicKey: PublicKey<CurveType>) -> Bool
}

let privateKey = PrivateKey<Secp256k1>(hex: "B7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF")!

let keyPair = AnyKeyGenerator<Secp256k1>.restoreKeyPairFrom(privateKey: privateKey)

let message = Message(hex: "243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89")

let signature = AnyKeySigner<Schnorr<Secp256k1>>.sign(message, using: keyPair)

let expectedSignature = Signature<Secp256k1>(hex: "2A298DACAE57395A15D0795DDBFD1DCB564DA82B0F269BC70A74F8220429BA1D1E51A22CCEC35599B8F266912281F8365FFC2D035A230434A1A64DC59F7013FD")!

if signature == expectedSignature {
    print("Correct signature!")
}

if AnyKeySigner<Schnorr<Secp256k1>>.verify(message, wasSignedBy: signature, publicKey: keyPair.publicKey) {
     print("Yes, message was indeed signed by public key and prodouced that signature.")
}

func vU256Add(_ a: UnsafePointer<vU256>, 
            _ b: UnsafePointer<vU256>, 
            _ result: UnsafeMutablePointer<vU256>)