-\feffusing System.Security.Cryptography;
-using System.Collections.Generic;
+\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.Diagnostics.Contracts;
using System.Linq;
namespace Novacoin
{
- public abstract class Hash
+ public abstract class Hash : IEquatable<Hash>, IComparable<Hash>
{
/// <summary>
- /// Computes the SHA256 hash for the input data using the managed library.
- /// </summary>
- protected static SHA256Managed _hasher256 = new SHA256Managed();
-
- /// <summary>
/// Array of digest bytes.
/// </summary>
- protected byte[] _hashBytes = null;
+ protected byte[] _hashBytes;
/// <summary>
/// Hash size, must be overriden
get;
}
- public byte[] hashBytes
- {
- get { return _hashBytes; }
- }
-
/// <summary>
/// Initializes an empty instance of the Hash class.
/// </summary>
public Hash()
{
- _hashBytes = Enumerable.Repeat<byte>(0, hashSize).ToArray();
+ _hashBytes = new byte[hashSize];
}
/// <summary>
- /// Initializes a new instance of Hash class with first 20 bytes from supplied list
+ /// Initializes a new instance of Hash class
/// </summary>
- /// <param name="bytesList">List of bytes</param>
- public Hash(IEnumerable<byte> bytes)
+ /// <param name="bytesList">Array of bytes</param>
+ public Hash(byte[] bytes, int offset = 0)
{
- _hashBytes = bytes.Take<byte>(hashSize).ToArray<byte>();
+ if (bytes.Length - offset < hashSize)
+ {
+ throw new ArgumentException("You need to provide a sufficient amount of data to initialize new instance of hash object.");
+ }
+
+ _hashBytes = new byte[hashSize];
+ Array.Copy(bytes, offset, _hashBytes, 0, hashSize);
}
- public Hash(byte[] bytes)
+ /// <summary>
+ /// Initializes a new instance of Hash class as a copy of another one
+ /// </summary>
+ /// <param name="bytesList">Instance of hash class</param>
+ public Hash(Hash h)
{
- _hashBytes = bytes;
+ _hashBytes = new byte[h.hashSize];
+ h._hashBytes.CopyTo(_hashBytes, 0);
}
public bool IsZero
get { return !_hashBytes.Any(b => b != 0); }
}
+ public static implicit operator byte[](Hash h)
+ {
+ return h._hashBytes;
+ }
+
+ public bool Equals(Hash item)
+ {
+ if ((object)item == null)
+ {
+ return false;
+ }
+ return _hashBytes.SequenceEqual((byte[])item);
+ }
+
+ public override bool Equals(object o)
+ {
+ if (o == null)
+ {
+ return false;
+ }
+
+ return _hashBytes.SequenceEqual(((Hash)o)._hashBytes);
+ }
+
+ public override int GetHashCode()
+ {
+ int hash = 17;
+ unchecked
+ {
+ foreach (var element in _hashBytes)
+ {
+ hash = hash * 31 + element.GetHashCode();
+ }
+ }
+ return hash;
+ }
+
+ public int CompareTo(Hash item)
+ {
+ if (this > item)
+ {
+ return 1;
+ }
+ else if (this < item)
+ {
+ return -1;
+ }
+
+ return 0;
+ }
+
+ public static bool operator <(Hash a, Hash b)
+ {
+ Contract.Requires<NullReferenceException>((object)a != null && (object)b != null, "Null references are not allowed.");
+ Contract.Requires<ArgumentException>(a.hashSize == b.hashSize, "Hashes must have the same size.");
+
+ for (int i = a.hashSize - 1; i >= 0; i--)
+ {
+ if (a._hashBytes[i] < b._hashBytes[i])
+ {
+ return true;
+ }
+ else if (a._hashBytes[i] > b._hashBytes[i])
+ {
+ return false;
+ }
+ }
+
+ return false;
+ }
+
+ public static bool operator <=(Hash a, Hash b)
+ {
+ Contract.Requires<NullReferenceException>((object)a != null && (object)b != null, "Null references are not allowed.");
+ Contract.Requires<ArgumentException>(a.hashSize == b.hashSize, "Hashes must have the same size.");
+
+ for (int i = a.hashSize - 1; i >= 0; i--)
+ {
+ if (a._hashBytes[i] < b._hashBytes[i])
+ {
+ return true;
+ }
+ else if (a._hashBytes[i] > b._hashBytes[i])
+ {
+ return false;
+ }
+ }
+
+ return false;
+ }
+
+ public static bool operator >(Hash a, Hash b)
+ {
+ Contract.Requires<NullReferenceException>((object)a != null && (object)b != null, "Null references are not allowed.");
+ Contract.Requires<ArgumentException>(a.hashSize == b.hashSize, "Hashes must have the same size.");
+
+ for (int i = a.hashSize - 1; i >= 0; i--)
+ {
+ if (a._hashBytes[i] > b._hashBytes[i])
+ {
+ return true;
+ }
+ else if (a._hashBytes[i] < b._hashBytes[i])
+ {
+ return false;
+ }
+ }
+
+ return false;
+ }
+
+ public static bool operator >=(Hash a, Hash b)
+ {
+ Contract.Requires<NullReferenceException>((object)a != null && (object)b != null, "Null references are not allowed.");
+ Contract.Requires<ArgumentException>(a.hashSize == b.hashSize, "Hashes must have the same size.");
+
+ for (int i = a.hashSize - 1; i >= 0; i--)
+ {
+ if (a._hashBytes[i] > b._hashBytes[i])
+ {
+ return true;
+ }
+ else if (a._hashBytes[i] < b._hashBytes[i])
+ {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ public static bool operator ==(Hash a, Hash b)
+ {
+ Contract.Requires<NullReferenceException>((object)a != null && (object)b != null, "Null references are not allowed.");
+ Contract.Requires<ArgumentException>(a.hashSize == b.hashSize, "Hashes must have the same size.");
+
+ return a._hashBytes.SequenceEqual(b._hashBytes);
+ }
+
+ public static bool operator !=(Hash a, Hash b)
+ {
+ return !(a == b);
+ }
+
public override string ToString()
{
return Interop.ToHex(Interop.ReverseBytes(_hashBytes));
git://git.novaco.in / NovacoinLibrary.git / blobdiff