consolidate all repos to one for archive

semester_3/racunalniska_omrezja/naloga_5/WpfBlockChanApp/Block.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Security.Cryptography;
+using System.Threading.Tasks;
+using System.Text.Json.Serialization;
+
+namespace WpfBlockChanApp
+{
+    internal class Block
+    {
+        public int Index { get; set; }
+        public string PreviousHash { get; set; }
+        public string Hash { get; set; }
+        public string Data { get; set; }
+        public long Timestamp { get; set; }
+        public int Nonce { get; set; }
+        public int Difficulty { get; set; }
+        public int LastAdjustBlock { get; set; }
+
+        [JsonIgnore]
+        public string GetString 
+        { 
+            get { return $"{Index}\n{Data}\n{PreviousHash}\n{Hash}"; }
+        }
+
+        public Block(int index, string previousHash, string data, int difficulty, int lastAdjustBlock)
+        {
+            Index = index;
+            PreviousHash = previousHash;
+            Data = data;
+            Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
+            Nonce = 0;
+            Difficulty = difficulty;
+            LastAdjustBlock = lastAdjustBlock;
+            Hash = CalculateHash();
+        }
+
+        public string CalculateHash()
+        {
+            using (SHA256 sha256 = SHA256.Create())
+            {
+                byte[] inputBytes = Encoding.UTF8.GetBytes($"{Index}{PreviousHash}{Timestamp}{Data}{Difficulty}{Nonce}");
+                byte[] outputBytes = sha256.ComputeHash(inputBytes);
+                return Convert.ToBase64String(outputBytes);
+            }
+        }
+
+        public bool MatchDifficulty()
+        {
+            return Hash[..Difficulty] != new string('0', Difficulty);
+        }
+
+
+    }
+}