Split application and library.

2020-09-02 00:03:14 +02:00
parent cd7a71bfe0
commit f97321d929
11 changed files with 123 additions and 19 deletions
--- a/BasicBlockChain.Core/Block.cs
+++ b/BasicBlockChain.Core/Block.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Text;
+using VAR.Json;
+
+namespace BasicBlockChain.Core
+{
+    public class Block
+    {
+        public int Index { get; set; }
+        public DateTime Date { get; set; }
+        public string PreviousHash { get; set; }
+        public List<Transaction> Transactions { get; } = new List<Transaction>();
+        public string Hash { get; set; }
+        public int Nonce { get; set; }
+
+        public Block(DateTime date, Block previousBlock, IList<Transaction> transactions)
+        {
+            Index = (previousBlock?.Index ?? -1) + 1;
+            Date = date;
+            PreviousHash = previousBlock?.Hash;
+            if (transactions != null) { Transactions.AddRange(transactions); }
+            Nonce = 0;
+            Hash = CalculateHash();
+        }
+
+        private string GetData()
+        {
+            return JsonWriter.WriteObject(Transactions);
+        }
+
+        public string CalculateHash(string data = null, SHA256 sha256 = null)
+        {
+            if (sha256 == null) { sha256 = SHA256.Create(); }
+            if (data == null)
+            {
+                data = GetData();
+            }
+            byte[] dataBytes = Encoding.UTF8.GetBytes(string.Format("{0}-{1}-{2}-{3}",
+                Date,
+                PreviousHash,
+                data,
+                Nonce));
+            byte[] hashBytes = sha256.ComputeHash(dataBytes);
+
+            string hash = Convert.ToBase64String(hashBytes);
+            return hash;
+        }
+
+        public void Mine(int difficulty)
+        {
+            SHA256 sha256 = SHA256.Create();
+            var leadingZeros = new string('0', difficulty);
+            string data = GetData();
+            while (Hash.Substring(0, difficulty) != leadingZeros)
+            {
+                Nonce++;
+                Hash = CalculateHash(data, sha256);
+            }
+        }
+    }
+}