Signature typedef Null safety

Signature = void Function(Pointer<Uint8> sig, int mlen, Pointer<Uint8> m, Pointer<Uint8> randr, Pointer<Uint8> sk)

Implementation

typedef Signature = void Function(Pointer<Uint8> sig, int mlen,
    Pointer<Uint8> m, Pointer<Uint8> randr, Pointer<Uint8> sk);