namespace System.Security.Cryptography { internal static class KeyFormatHelper { internal delegate void KeyReader<TRet> (ReadOnlySpan<byte> key, ValueAlgorithmIdentifierAsn algId, out TRet ret); internal delegate void KeyReader<TRet, TState> (ReadOnlySpan<byte> key, TState state, ValueAlgorithmIdentifierAsn algId, out TRet ret); internal delegate TRet ReadOnlySpanFunc<TIn, TRet> (ReadOnlySpan<TIn> span); } }