namespace System.Security.Cryptography
{
    [SupportedOSPlatform("ios13.0")]
    [SupportedOSPlatform("tvos13.0")]
    [UnsupportedOSPlatform("browser")]
    [UnsupportedOSPlatform("ios")]
    [UnsupportedOSPlatform("tvos")]
    public sealed class ChaCha20Poly1305 : IDisposable
    {
        public ChaCha20Poly1305(ReadOnlySpan<byte> key);
    }
}