Complete implementation of uint256 and uint160 classes.

[NovacoinLibrary.git] / Novacoin / ScryptHash256.cs

diff --git a/Novacoin/ScryptHash256.cs b/Novacoin/ScryptHash256.cs
index cd0caa3..4f95926 100644 (file)
--- a/Novacoin/ScryptHash256.cs
+++ b/Novacoin/ScryptHash256.cs
@@ -1,16 +1,28 @@
-\feffusing System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
+\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.
 
-using Org.BouncyCastle.Crypto;
-using Org.BouncyCastle.Security;
-using Org.BouncyCastle.Asn1;
+ *  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;
 
 namespace Novacoin
 {
+    /// <summary>
+    /// Representation of scrypt hash
+    /// </summary>
     public class ScryptHash256 : Hash
     {
         // 32 bytes
@@ -20,49 +32,41 @@ namespace Novacoin
         }
 
         public ScryptHash256() : base() { }
-        public ScryptHash256(byte[] bytesArray) : base(bytesArray) { }
-        public ScryptHash256(IList<byte> bytesList) : base(bytesList) { }
-
-        public static ScryptHash256 Compute256(IEnumerable<byte> inputBytes)
+        public ScryptHash256(byte[] bytes, int offset = 0) : base(bytes, offset) { }
+        public ScryptHash256(ScryptHash256 h) : base(h) { }
+
+        /// <summary>
+        /// Calculate scrypt hash and return new instance of ScryptHash256 class
+        /// </summary>
+        /// <param name="inputBytes">Byte sequence to hash</param>
+        /// <returns>Hashing result instance</returns>
+        public static ScryptHash256 Compute256(byte[] inputBytes)
         {
-            byte[] dataBytes = inputBytes.ToArray();
-
-            uint[] V = new uint[(131072 + 63) / sizeof(uint)];
-
-            // sha1 test:
-            //            Rfc2898DeriveBytes key1 = new Rfc2898DeriveBytes(dataBytes, dataBytes, 1);
-            //            byte[] keyBytes1 = key1.GetBytes(128);
+            var V = new uint[(131072 + 63) / sizeof(uint)];
 
+            var keyBytes1 = CryptoUtils.PBKDF2_Sha256(128, (byte[])inputBytes, (byte[])inputBytes, 1);
+            var X = Interop.ToUInt32Array(keyBytes1);
 
-            // stub:
-            byte[] keyBytes1 = null;
-
-            uint[] X = Interop.ToUInt32Array(keyBytes1);
-
-            ushort i, j, k;
-            for (i = 0; i < 1024; i++)
+            for (var i = 0; i < 1024; i++)
             {
                 Array.Copy(X, 0, V, i * 32, 32);
 
                 xor_salsa8(ref X, 0, ref X, 16);
                 xor_salsa8(ref X, 16, ref X, 0);
             }
-            for (i = 0; i < 1024; i++)
+            for (var i = 0; i < 1024; i++)
             {
-                j = (ushort)(32 * (X[16] & 1023));
-                for (k = 0; k < 32; k++)
+                var j = 32 * (X[16] & 1023);
+                for (var k = 0; k < 32; k++)
+                {
                     X[k] ^= V[j + k];
+                }
                 xor_salsa8(ref X, 0, ref X, 16);
                 xor_salsa8(ref X, 16, ref X, 0);
             }
 
-            byte[] xBytes = Interop.LEBytes(X);
-
-            // sha1 test:
-            //            Rfc2898DeriveBytes key2 = new Rfc2898DeriveBytes(dataBytes, xBytes, 1);
-            //            byte[] keyBytes2 = key2.GetBytes(32);
-
-            byte[] keyBytes2 = null;
+            var xBytes = Interop.LEBytes(X);
+            var keyBytes2 = CryptoUtils.PBKDF2_Sha256(32, (byte[])inputBytes, xBytes, 1);
 
             return new ScryptHash256(keyBytes2);
         }