mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-22 19:36:11 +00:00
401 lines
11 KiB
C#
401 lines
11 KiB
C#
// Decompiled with JetBrains decompiler
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// Type: Microsoft.InfoCards.BigInt
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// Assembly: infocard, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
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// MVID: 1D4D5564-A025-490C-AF1D-DF4FBB709D1F
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// Assembly location: C:\Users\Administrateur\Downloads\Virusshare-00001-msil\Virus.Win32.Expiro.w-f8f9f26e940480624825f6bddbea86e70fc4aa746c4dd8efa7d98dcb477000ed.exe
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using Microsoft.InfoCards.Diagnostics;
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using System;
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namespace Microsoft.InfoCards
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{
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internal sealed class BigInt
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{
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private const int m_maxbytes = 128;
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private const int m_base = 256;
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private byte[] m_elements;
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private int m_size;
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private static readonly char[] decValues = new char[10]
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{
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'0',
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9'
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};
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internal BigInt() => this.m_elements = new byte[128];
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internal BigInt(byte[] b)
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{
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this.m_elements = new byte[128];
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Array.Copy((Array) b, (Array) this.m_elements, b.Length);
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this.m_size = b.Length;
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}
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internal BigInt(byte b)
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{
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this.m_elements = new byte[128];
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this.SetDigit(0, b);
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}
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internal int Size
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{
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get => this.m_size;
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set
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{
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this.m_size = value;
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if (value > 128)
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this.m_size = 128;
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if (value >= 0)
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return;
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this.m_size = 0;
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}
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}
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internal byte GetDigit(int index) => index < 0 || index >= this.m_size ? (byte) 0 : this.m_elements[index];
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internal void SetDigit(int index, byte digit)
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{
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if (index < 0 || index >= 128)
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return;
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this.m_elements[index] = digit;
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if (index >= this.m_size && digit != (byte) 0)
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this.m_size = index + 1;
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if (index != this.m_size - 1 || digit != (byte) 0)
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return;
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--this.m_size;
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}
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internal void SetDigit(int index, byte digit, ref int size)
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{
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if (index < 0 || index >= 128)
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return;
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this.m_elements[index] = digit;
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if (index >= size && digit != (byte) 0)
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size = index + 1;
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if (index != size - 1 || digit != (byte) 0)
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return;
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--size;
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}
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public static bool operator <(BigInt value1, BigInt value2)
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{
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if (value1 == (BigInt) null)
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return true;
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if (value2 == (BigInt) null)
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return false;
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int size1 = value1.Size;
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int size2 = value2.Size;
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if (size1 != size2)
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return size1 < size2;
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while (size1-- > 0)
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{
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if ((int) value1.m_elements[size1] != (int) value2.m_elements[size1])
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return (int) value1.m_elements[size1] < (int) value2.m_elements[size1];
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}
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return false;
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}
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public static bool operator >(BigInt value1, BigInt value2)
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{
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if (value1 == (BigInt) null)
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return false;
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if (value2 == (BigInt) null)
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return true;
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int size1 = value1.Size;
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int size2 = value2.Size;
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if (size1 != size2)
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return size1 > size2;
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while (size1-- > 0)
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{
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if ((int) value1.m_elements[size1] != (int) value2.m_elements[size1])
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return (int) value1.m_elements[size1] > (int) value2.m_elements[size1];
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}
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return false;
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}
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public static bool operator ==(BigInt value1, BigInt value2)
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{
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if ((object) value1 == null)
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return (object) value2 == null;
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if ((object) value2 == null)
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return (object) value1 == null;
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int size1 = value1.Size;
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int size2 = value2.Size;
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if (size1 != size2)
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return false;
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for (int index = 0; index < size1; ++index)
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{
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if ((int) value1.m_elements[index] != (int) value2.m_elements[index])
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return false;
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}
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return true;
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}
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public static bool operator !=(BigInt value1, BigInt value2) => !(value1 == value2);
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public override bool Equals(object obj)
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{
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BigInt bigInt = obj as BigInt;
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return (BigInt) null != bigInt && bigInt == this;
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}
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public override int GetHashCode()
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{
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int hashCode = 0;
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for (int index = 0; index < this.m_size; ++index)
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hashCode += (int) this.GetDigit(index);
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return hashCode;
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}
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internal static void Add(BigInt a, byte b, ref BigInt c)
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{
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byte digit = b;
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int size1 = a.Size;
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int size2 = 0;
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for (int index = 0; index < size1; ++index)
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{
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int num = (int) a.GetDigit(index) + (int) digit;
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c.SetDigit(index, (byte) (num & (int) byte.MaxValue), ref size2);
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digit = (byte) (num >> 8 & (int) byte.MaxValue);
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}
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if (digit != (byte) 0)
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c.SetDigit(a.Size, digit, ref size2);
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c.Size = size2;
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}
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internal static void Negate(ref BigInt a)
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{
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int size = 0;
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for (int index = 0; index < 128; ++index)
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a.SetDigit(index, (byte) ((uint) ~a.GetDigit(index) & (uint) byte.MaxValue), ref size);
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for (int index = 0; index < 128; ++index)
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{
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a.SetDigit(index, (byte) ((uint) a.GetDigit(index) + 1U), ref size);
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if (((int) a.GetDigit(index) & (int) byte.MaxValue) == 0)
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a.SetDigit(index, (byte) ((uint) a.GetDigit(index) & (uint) byte.MaxValue), ref size);
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else
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break;
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}
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a.Size = size;
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}
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internal static void Subtract(BigInt a, BigInt b, ref BigInt c)
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{
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byte num1 = 0;
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if (a < b)
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{
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BigInt.Subtract(b, a, ref c);
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BigInt.Negate(ref c);
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}
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else
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{
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int size1 = a.Size;
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int size2 = 0;
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for (int index = 0; index < size1; ++index)
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{
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int num2 = (int) a.GetDigit(index) - (int) b.GetDigit(index) - (int) num1;
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num1 = (byte) 0;
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if (num2 < 0)
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{
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num2 += 256;
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num1 = (byte) 1;
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}
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c.SetDigit(index, (byte) (num2 & (int) byte.MaxValue), ref size2);
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}
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c.Size = size2;
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}
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}
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private void Multiply(int b)
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{
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if (b == 0)
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{
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this.Clear();
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}
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else
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{
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int num1 = 0;
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int size1 = this.Size;
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int size2 = 0;
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for (int index = 0; index < size1; ++index)
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{
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int num2 = b * (int) this.GetDigit(index) + num1;
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num1 = num2 / 256;
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this.SetDigit(index, (byte) (num2 % 256), ref size2);
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}
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if (num1 != 0)
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{
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byte[] bytes = BitConverter.GetBytes(num1);
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for (int index = 0; index < bytes.Length; ++index)
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this.SetDigit(size1 + index, bytes[index], ref size2);
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}
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this.Size = size2;
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}
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}
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private static void Multiply(BigInt a, int b, ref BigInt c)
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{
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if (b == 0)
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{
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c.Clear();
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}
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else
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{
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int num1 = 0;
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int size1 = a.Size;
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int size2 = 0;
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for (int index = 0; index < size1; ++index)
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{
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int num2 = b * (int) a.GetDigit(index) + num1;
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num1 = num2 / 256;
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c.SetDigit(index, (byte) (num2 % 256), ref size2);
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}
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if (num1 != 0)
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{
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byte[] bytes = BitConverter.GetBytes(num1);
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for (int index = 0; index < bytes.Length; ++index)
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c.SetDigit(size1 + index, bytes[index], ref size2);
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}
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c.Size = size2;
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}
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}
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private void Divide(int b)
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{
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int num1 = 0;
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int size1 = this.Size;
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int size2 = 0;
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while (size1-- > 0)
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{
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int num2 = 256 * num1 + (int) this.GetDigit(size1);
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num1 = num2 % b;
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this.SetDigit(size1, (byte) (num2 / b), ref size2);
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}
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this.Size = size2;
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}
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internal static void Divide(
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BigInt numerator,
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BigInt denominator,
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ref BigInt quotient,
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ref BigInt remainder)
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{
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if (numerator < denominator)
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{
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quotient.Clear();
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remainder.CopyFrom(numerator);
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}
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else if (numerator == denominator)
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{
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quotient.Clear();
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quotient.SetDigit(0, (byte) 1);
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remainder.Clear();
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}
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else
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{
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BigInt c1 = new BigInt();
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c1.CopyFrom(numerator);
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BigInt a = new BigInt();
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a.CopyFrom(denominator);
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uint num = 0;
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while (a.Size < c1.Size)
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{
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a.Multiply(256);
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++num;
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}
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if (a > c1)
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{
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a.Divide(256);
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--num;
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}
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BigInt c2 = new BigInt();
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quotient.Clear();
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for (int index = 0; (long) index <= (long) num; ++index)
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{
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int b = (c1.Size == a.Size ? (int) c1.GetDigit(c1.Size - 1) : 256 * (int) c1.GetDigit(c1.Size - 1) + (int) c1.GetDigit(c1.Size - 2)) / (int) a.GetDigit(a.Size - 1);
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if (b >= 256)
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b = (int) byte.MaxValue;
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BigInt.Multiply(a, b, ref c2);
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while (c2 > c1)
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{
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--b;
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BigInt.Multiply(a, b, ref c2);
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}
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quotient.Multiply(256);
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BigInt.Add(quotient, (byte) b, ref quotient);
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BigInt.Subtract(c1, c2, ref c1);
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a.Divide(256);
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}
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remainder.CopyFrom(c1);
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}
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}
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internal void CopyFrom(BigInt a)
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{
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Array.Copy((Array) a.m_elements, (Array) this.m_elements, 128);
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this.m_size = a.m_size;
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}
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internal bool IsZero()
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{
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for (int index = 0; index < this.m_size; ++index)
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{
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if (this.m_elements[index] != (byte) 0)
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return false;
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}
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return true;
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}
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internal byte[] ToByteArray()
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{
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byte[] destinationArray = new byte[this.Size];
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Array.Copy((Array) this.m_elements, (Array) destinationArray, this.Size);
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return destinationArray;
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}
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internal void Clear() => this.m_size = 0;
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internal void FromDecimal(string decNum)
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{
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BigInt c1 = new BigInt();
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BigInt c2 = new BigInt();
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int length = decNum.Length;
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for (int index = 0; index < length; ++index)
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{
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if (decNum[index] > '9' || decNum[index] < '0')
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throw InfoCardTrace.ThrowHelperError((Exception) new FormatException());
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BigInt.Multiply(c1, 10, ref c2);
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BigInt.Add(c2, (byte) ((uint) decNum[index] - 48U), ref c1);
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}
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this.CopyFrom(c1);
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}
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internal string ToDecimal()
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{
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BigInt denominator = new BigInt((byte) 10);
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BigInt numerator = new BigInt();
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BigInt quotient = new BigInt();
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BigInt remainder = new BigInt();
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numerator.CopyFrom(this);
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char[] chArray = new char[8 * this.m_size / 3];
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int length = 0;
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do
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{
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BigInt.Divide(numerator, denominator, ref quotient, ref remainder);
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chArray[length++] = BigInt.decValues[(int) remainder.m_elements[0]];
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numerator.CopyFrom(quotient);
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}
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while (!quotient.IsZero());
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Array.Reverse((Array) chArray, 0, length);
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return new string(chArray, 0, length);
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}
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}
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}
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