qdr.fnd/qdr.fnd.core/IO/Extensions/StreamExt.cs

using System;
using System.IO;
using System.Security.Cryptography;

namespace Quadarax.Foundation.Core.IO
{
    public static class StreamExt
    {
        public static string GetStreamCalculatedHash(this Stream stream, HashAlgorithm algorithm)
        {
            if (stream == null)
                throw new ArgumentNullException(nameof(stream));

            if (algorithm == null)
                throw new ArgumentNullException(nameof(algorithm));

            return BitConverter.ToString(algorithm.ComputeHash(stream)).Replace("-", "").ToLowerInvariant();

        }
    }
}