using System;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

​

public static class GuidUtility

{

        private const int GuidByteSize = 16;

        private const int GuidVersion = 5;

        private static readonly HashAlgorithm HashAlgorithm = SHA1.Create();

        private static readonly Guid Namespace = new Guid("6ba7b810-9dad-11d1-80b4-00c04fd430c8");

​

        /// <summary>

        /// Generate version 5 GUID

        /// </summary>

        /// <param name="source">source url</param>

        /// <returns>version 5 guid</returns>

        public static Guid GenerateGuid(Uri source)

        {

            var namespaceByte = Namespace.ToByteArray();

            SwapByteOrder(namespaceByte);

            var sourceByte = Encoding.UTF8.GetBytes(source.ToString());

            var combine = namespaceByte.Concat(sourceByte);

            var hash = HashAlgorithm.ComputeHash(combine.ToArray());

            var truncatedHash = new byte[GuidByteSize];

            Array.Copy(hash, truncatedHash, truncatedHash.Length);

            truncatedHash[6] = (byte)((truncatedHash[6] & 0x0F) | (GuidVersion << 4));

            truncatedHash[8] = (byte)((truncatedHash[8] & 0x3F) | 0x80);

            SwapByteOrder(truncatedHash);

            return new Guid(truncatedHash);

        }

​

        private static void SwapByteOrder(byte[] guid)

        {

            SwapBytes(guid, 0, 3);

            SwapBytes(guid, 1, 2);

            SwapBytes(guid, 4, 5);

            SwapBytes(guid, 6, 7);

        }

​

        private static void SwapBytes(byte[] guid, int left, int right)

        {

            byte temp = guid[left];

            guid[left] = guid[right];

            guid[right] = temp;

        }

}

public class Program

{

    public static void Main()

    {

    var uri1 = new Uri("https://reamaze-prod.s3.amazonaws.com/variants/kuoixhw84k8wixtt01qyuobg9qwf/026a4da4defb650ee0dde7786131efb4c9c41140a25477b018edd6fa5031c1e8?response-content-disposition=inline%3B%20filename%3D%22lion_stalking.jpg%22%3B%20filename%2A%3DUTF-8%27%27lion_stalking.jpg&response-content-type=image%2Fjpeg&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJPYPX6P5IUU72ROA%2F20220114%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20220114T203830Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=190209638f53b2f2a937fa1c449390e2d6654b02dfd169d87b1215d105f37b6a");

    Console.WriteLine(GuidUtility.GenerateGuid(uri1));

    var uri2 = new Uri("https://reamaze-prod.s3.amazonaws.com/variants/5dedh196rcu6xawcl2cg5zqgn7t8/026a4da4defb650ee0dde7786131efb4c9c41140a25477b018edd6fa5031c1e8?response-content-disposition=inline%3B%20filename%3D%22female_leopard_1.JPG%22%3B%20filename%2A%3DUTF-8%27%27female_leopard_1.JPG&response-content-type=image%2Fjpeg&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJPYPX6P5IUU72ROA%2F20220114%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20220114T200840Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=c9268855834c84b2772d08f1649f65095c84e8a9a450268451bf37a887b72ee5");

    Console.WriteLine(GuidUtility.GenerateGuid(uri1));

    }

}