SystemExtensions/SystemExtensions.NetStandard.Security/Hashing/IHashingService.cs

using System.IO;
using System.Threading.Tasks;

namespace System.Security.Hashing
{
    public interface IHashingService
    {
        Task<string> Hash(string raw);
        Task<byte[]> Hash(byte[] raw);
        Task<Stream> Hash(Stream raw);
    }
}