Improve CryptoUtils with wrappers for managed implementations of standard hashing...

[NovacoinLibrary.git] / Novacoin / SHA256.cs

diff --git a/Novacoin/SHA256.cs b/Novacoin/SHA256.cs
index b8b6086..4ceda48 100644 (file)
--- a/Novacoin/SHA256.cs
+++ b/Novacoin/SHA256.cs
@@ -1,9 +1,22 @@
-\feffusing System;
-using System.Text;
-using System.Linq;
-using System.Collections.Generic;
+\feff/**
+ *  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
 {
@@ -12,22 +25,25 @@ namespace Novacoin
     /// </summary>
     public class SHA256 : Hash
     {
+        private static Sha256Digest _hasher256 = new Sha256Digest();
+
         // 32 bytes
         public override int hashSize
         {
-            get { return 32; }
+            get { return _hasher256.GetDigestSize(); }
         }
 
         public SHA256() : base() { }
         public SHA256(byte[] bytes, int offset = 0) : base(bytes, offset) { }
-        public SHA256(IEnumerable<byte> bytes, int skip = 0) : base(bytes, skip) { }
         public SHA256(SHA256 h) : base(h) { }
 
 
-        public static SHA256 Compute256(IEnumerable<byte> inputBytes)
+        public static SHA256 Compute256(byte[] inputBytes)
         {
-            byte[] dataBytes = inputBytes.ToArray();
-            byte[] digest1 = _hasher256.ComputeHash(dataBytes, 0, dataBytes.Length);
+            var digest1 = new byte[_hasher256.GetDigestSize()];
+
+            _hasher256.BlockUpdate(inputBytes, 0, inputBytes.Length);
+            _hasher256.DoFinal(digest1, 0);
 
             return new SHA256(digest1);
         }