X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=Novacoin%2FHash256.cs;h=3d3a360ac051d4ad5000b550ca2736e73954b8ea;hb=1f6b6ffe24de703593f20f5f881a2e797473621c;hp=132dc4088aa4260078b738762dd4aacdef668f96;hpb=9f4f9d3f60f89dcf29fb7b24d60ffd40d7360a7d;p=NovacoinLibrary.git

diff --git a/Novacoin/Hash256.cs b/Novacoin/Hash256.cs
index 132dc40..3d3a360 100644
--- a/Novacoin/Hash256.cs
+++ b/Novacoin/Hash256.cs
@@ -1,37 +1,97 @@
-using System;
-using System.Text;
-using System.Linq;
-using System.Collections.Generic;
+/**
+ *  Novacoin classes library
+ *  Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
 
-using System.Security.Cryptography;
+ *  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 Org.BouncyCastle.Crypto.Digests;
 
 namespace Novacoin
 {
-	/// <summary>
-	/// Representation of SHA-256 hash
-	/// </summary>
+    /// <summary>
+    /// Representation of Double SHA-256 hash
+    /// </summary>
     public class Hash256 : Hash
     {
+        private static Sha256Digest _hasher256 = new Sha256Digest();
+
         // 32 bytes
         public override int hashSize
         {
-            get { return 32; }
+            get { return _hasher256.GetDigestSize(); }
         }
 
         public Hash256() : base() { }
-        public Hash256(byte[] bytes) : base(bytes) { }
-        public Hash256(IEnumerable<byte> bytes) : base(bytes) { }
+        public Hash256(byte[] bytes, int offset=0) : base(bytes, offset) { }
         public Hash256(Hash256 h) : base(h) { }
 
+        public static Hash256 Compute256(byte[] dataBytes)
+        {
+            var digest1 = new byte[32];
+            var digest2 = new byte[32];
+
+            _hasher256.BlockUpdate(dataBytes, 0, dataBytes.Length);            
+            _hasher256.DoFinal(digest1, 0);
+            _hasher256.BlockUpdate(digest1, 0, digest1.Length);            
+            _hasher256.DoFinal(digest2, 0);
+
+            return new Hash256(digest2);
+        }
 
-        public static Hash256 Compute256(IEnumerable<byte> inputBytes)
+        public static Hash256 Compute256(ref byte[] input1, ref byte[] input2)
         {
-            byte[] dataBytes = inputBytes.ToArray();
-            byte[] digest1 = _hasher256.ComputeHash(dataBytes, 0, dataBytes.Length);
-            byte[] digest2 = _hasher256.ComputeHash(digest1, 0, digest1.Length);
+            var digest1 = new byte[_hasher256.GetDigestSize()];
+            var digest2 = new byte[_hasher256.GetDigestSize()];
+
+            _hasher256.BlockUpdate(input1, 0, input1.Length);
+            _hasher256.BlockUpdate(input2, 0, input2.Length);
+            _hasher256.DoFinal(digest1, 0);
+
+            _hasher256.BlockUpdate(digest1, 0, digest1.Length);
+            _hasher256.DoFinal(digest2, 0);
 
             return new Hash256(digest2);
         }
+
+        public static byte[] ComputeRaw256(byte[] dataBytes)
+        {
+            var digest1 = new byte[32];
+            var digest2 = new byte[32];
+
+            _hasher256.BlockUpdate(dataBytes, 0, dataBytes.Length);
+            _hasher256.DoFinal(digest1, 0);
+            _hasher256.BlockUpdate(digest1, 0, digest1.Length);
+            _hasher256.DoFinal(digest2, 0);
+
+            return digest2;
+        }
+
+        public static byte[] ComputeRaw256(ref byte[] input1, ref byte[] input2)
+        {
+            var digest1 = new byte[_hasher256.GetDigestSize()];
+            var digest2 = new byte[_hasher256.GetDigestSize()];
+
+            _hasher256.BlockUpdate(input1, 0, input1.Length);
+            _hasher256.BlockUpdate(input2, 0, input2.Length);
+            _hasher256.DoFinal(digest1, 0);
+
+            _hasher256.BlockUpdate(digest1, 0, digest1.Length);
+            _hasher256.DoFinal(digest2, 0);
+
+            return digest2;
+        }
     }
 }
-