Block and transaction verifications

[NovacoinLibrary.git] / Novacoin / CBlockHeader.cs

diff --git a/Novacoin/CBlockHeader.cs b/Novacoin/CBlockHeader.cs
index d85f34f..8e151e9 100644 (file)
--- a/Novacoin/CBlockHeader.cs
+++ b/Novacoin/CBlockHeader.cs
@@ -1,13 +1,32 @@
-\feffusing System;
+\feff/**
+ *  Novacoin classes library
+ *  Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
 using System.Text;
 using System.Collections.Generic;
+using System.Diagnostics.Contracts;
 
 namespace Novacoin
 {
-       /// <summary>
-       /// Block header
-       /// </summary>
-       public class CBlockHeader
+    /// <summary>
+    /// Block header
+    /// </summary>
+    public class CBlockHeader
        {
                /// <summary>
                /// Version of block schema.
@@ -17,7 +36,7 @@ namespace Novacoin
                /// <summary>
                /// Previous block hash.
                /// </summary>
-               public Hash256 prevHash = new Hash256();
+               public ScryptHash256 prevHash = new ScryptHash256();
 
                /// <summary>
                /// Merkle root hash.
@@ -46,30 +65,56 @@ namespace Novacoin
                {
                }
 
+        public CBlockHeader(CBlockHeader h)
+        {
+            nVersion = h.nVersion;
+            prevHash = new ScryptHash256(h.prevHash);
+            merkleRoot = new Hash256(h.merkleRoot);
+            nTime = h.nTime;
+            nBits = h.nBits;
+            nNonce = h.nNonce;
+        }
+
+        public CBlockHeader(byte[] bytes)
+        {
+            Contract.Requires<ArgumentException>(bytes.Length == 80, "Any valid block header is exactly 80 bytes long.");
+
+            nVersion = BitConverter.ToUInt32(bytes, 0);
+            prevHash = new ScryptHash256(bytes, 4);
+            merkleRoot = new Hash256(bytes, 36);
+            nTime = BitConverter.ToUInt32(bytes, 68);
+            nBits = BitConverter.ToUInt32(bytes, 72);
+            nNonce = BitConverter.ToUInt32(bytes, 76);
+        }
+
         /// <summary>
         /// Convert current block header instance into sequence of bytes
         /// </summary>
         /// <returns>Byte sequence</returns>
-        public IList<byte> Bytes
+        public static implicit operator byte[] (CBlockHeader h)
+        {
+            var r = new List<byte>();
+
+            r.AddRange(BitConverter.GetBytes(h.nVersion));
+            r.AddRange((byte[])h.prevHash);
+            r.AddRange((byte[])h.merkleRoot);
+            r.AddRange(BitConverter.GetBytes(h.nTime));
+            r.AddRange(BitConverter.GetBytes(h.nBits));
+            r.AddRange(BitConverter.GetBytes(h.nNonce));
+
+            return r.ToArray();
+        }
+
+        public ScryptHash256 Hash
         {
-            get
-            {
-                List<byte> r = new List<byte>();
-
-                r.AddRange(BitConverter.GetBytes(nVersion));
-                r.AddRange(prevHash.hashBytes);
-                r.AddRange(merkleRoot.hashBytes);
-                r.AddRange(BitConverter.GetBytes(nTime));
-                r.AddRange(BitConverter.GetBytes(nBits));
-                r.AddRange(BitConverter.GetBytes(nNonce));
-
-                return r;
+            get {
+                return ScryptHash256.Compute256(this);
             }
         }
 
         public override string ToString()
         {
-            StringBuilder sb = new StringBuilder();
+            var sb = new StringBuilder();
             sb.AppendFormat("CBlockHeader(nVersion={0}, prevHash={1}, merkleRoot={2}, nTime={3}, nBits={4}, nNonce={5})", nVersion, prevHash.ToString(), merkleRoot.ToString(), nTime, nBits, nNonce);
             return sb.ToString();
         }