\feffusing System;
using System.Collections.Generic;
+using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
+using System.Numerics;
namespace Novacoin
{
public class uint256 : base_uint
{
+ new public readonly int nWidth = 8;
+
+ public uint256()
+ {
+ base.nWidth = nWidth;
+ pn = new uint[nWidth];
+
+ for (int i = 0; i < nWidth; i++)
+ {
+ pn[i] = 0;
+ }
+ }
+
+ public uint256(uint256 b)
+ {
+ base.nWidth = nWidth;
+ pn = new uint[nWidth];
+
+ for (int i = 0; i < nWidth; i++)
+ {
+ pn[i] = b.pn[i];
+ }
+ }
+
+
+ public uint256(ulong n)
+ {
+ base.nWidth = nWidth;
+ pn = new uint[nWidth];
+
+ pn[0] = (uint)n;
+ pn[1] = (uint)(n >> 32);
+ for (int i = 2; i < nWidth; i++)
+ {
+ pn[i] = 0;
+ }
+ }
+
+ public uint256(byte[] bytes)
+ {
+ Contract.Requires<ArgumentException>(bytes.Length == 32, "Incorrect array length");
+
+ base.nWidth = nWidth;
+ pn = Interop.ToUInt32Array(bytes);
+ }
+
+ public uint256(string hex)
+ {
+ Contract.Requires<ArgumentException>(hex.Length == 64, "Incorrect string");
+
+ base.nWidth = nWidth;
+ var bytes = Interop.ReverseBytes(Interop.HexToArray(hex));
+ pn = Interop.ToUInt32Array(bytes);
+ }
+
+ /// <summary>
+ /// Compact representation of unsigned 256bit numbers.
+ ///
+ /// N = (-1^sign) * m * 256^(exp-3)
+ ///
+ /// http://bitcoin.stackexchange.com/questions/30467/what-are-the-equations-to-convert-between-bits-and-difficulty
+ /// </summary>
+ public uint Compact
+ {
+ get
+ {
+ int nSize = (bits + 7) / 8;
+ uint nCompact = 0;
+ if (nSize <= 3)
+ nCompact = ((uint)GetLow64()) << 8 * (3 - nSize);
+ else
+ {
+ uint256 bn = this >> 8 * (nSize - 3);
+ nCompact = (uint)bn.GetLow64();
+ }
+
+ if ((nCompact & 0x00800000) != 0)
+ {
+ nCompact >>= 8;
+ nSize++;
+ }
+
+ Contract.Assert((nCompact & ~0x007fffff) == 0);
+ Contract.Assert(nSize < 256);
+
+ nCompact |= (uint)nSize << 24;
+ nCompact |= 0;
+
+ return nCompact;
+ }
+ set {
+ int nSize = (int)value >> 24;
+ uint nWord = value & 0x007fffff;
+
+ uint256 i;
+
+ if (nSize <= 3)
+ {
+ nWord >>= 8 * (3 - nSize);
+ i = new uint256(nWord);
+ }
+ else
+ {
+ i = new uint256(nWord);
+ i <<= 8 * (nSize - 3);
+ }
+
+ pn = i.pn;
+ }
+ }
+
+ private void SetBytes(byte[] bytes)
+ {
+ pn = Interop.ToUInt32Array(Interop.ReverseBytes(bytes));
+ }
+
+ public static uint256 operator ~(uint256 a)
+ {
+ var ret = new uint256();
+ for (int i = 0; i < a.nWidth; i++)
+ {
+ ret.pn[i] = ~a.pn[i];
+ }
+ return ret;
+ }
+
+ public static uint256 operator -(uint256 a)
+ {
+ var ret = new uint256();
+ for (int i = 0; i < a.nWidth; i++)
+ {
+ ret.pn[i] = ~a.pn[i];
+ }
+ ret++;
+ return ret;
+ }
+
+
+ public static uint256 operator ++(uint256 a)
+ {
+ int i = 0;
+ while (++a.pn[i] == 0 && i < a.nWidth - 1)
+ {
+ i++;
+ }
+ return a;
+ }
+
+ public static uint256 operator --(uint256 a)
+ {
+ int i = 0;
+ while (--a.pn[i] == uint.MaxValue && i < a.nWidth - 1)
+ {
+ i++;
+ }
+ return a;
+ }
+
+ public static uint256 operator ^(uint256 a, uint256 b)
+ {
+ var result = new uint256();
+ result.pn = new uint[a.nWidth];
+ for (int i = 0; i < result.nWidth; i++)
+ {
+ result.pn[i] = a.pn[i] ^ b.pn[i];
+ }
+ return result;
+ }
+
+ public static uint256 operator +(uint256 a, uint256 b)
+ {
+ var result = new uint256();
+ ulong carry = 0;
+ for (int i = 0; i < result.nWidth; i++)
+ {
+ ulong n = carry + a.pn[i] + b.pn[i];
+ result.pn[i] = (uint)(n & 0xffffffff);
+ carry = n >> 32;
+ }
+ return result;
+ }
+
+ public static uint256 operator +(uint256 a, ulong b)
+ {
+ return a + new uint256(b);
+ }
+
+ public static uint256 operator -(uint256 a, uint256 b)
+ {
+ return a + (-b);
+ }
+
+ public static uint256 operator -(uint256 a, ulong b)
+ {
+ return a - new uint256(b);
+ }
+
+ public static uint256 operator &(uint256 a, uint256 b)
+ {
+ var result = new uint256();
+ result.pn = new uint[a.nWidth];
+ for (int i = 0; i < result.nWidth; i++)
+ {
+ result.pn[i] = a.pn[i] & b.pn[i];
+ }
+ return result;
+ }
+
+ public static uint256 operator |(uint256 a, uint256 b)
+ {
+ var result = new uint256();
+ result.pn = new uint[a.nWidth];
+ for (int i = 0; i < result.nWidth; i++)
+ {
+ result.pn[i] = a.pn[i] | b.pn[i];
+ }
+ return result;
+ }
+
+ public static uint256 operator <<(uint256 a, int shift)
+ {
+ var result = new uint256();
+ int k = shift / 32;
+ shift = shift % 32;
+
+ for (int i = 0; i < a.nWidth; i++)
+ {
+ if (i + k + 1 < a.nWidth && shift != 0)
+ {
+ result.pn[i + k + 1] |= (a.pn[i] >> (32 - shift));
+ }
+
+ if (i + k < a.nWidth)
+ {
+ result.pn[i + k] |= (a.pn[i] << shift);
+ }
+ }
+
+ return result;
+ }
+
+ public static uint256 operator >>(uint256 a, int shift)
+ {
+ var result = new uint256();
+ int k = shift / 32;
+ shift = shift % 32;
+
+ for (int i = 0; i < a.nWidth; i++)
+ {
+ if (i - k - 1 >= 0 && shift != 0)
+ {
+ result.pn[i - k - 1] |= (a.pn[i] << (32 - shift));
+ }
+
+ if (i - k >= 0)
+ {
+ result.pn[i - k] |= (a.pn[i] >> shift);
+ }
+ }
+
+ return result;
+ }
}
}
git://git.novaco.in / NovacoinLibrary.git / blobdiff