60 lines
1.3 KiB
C#
60 lines
1.3 KiB
C#
using Obfuz.Emit;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Threading.Tasks;
|
|
|
|
namespace Obfuz.Utils
|
|
{
|
|
public class RandomWithKey : IRandom
|
|
{
|
|
// LCG 参数（使用经典的数值）
|
|
private const long a = 1664525;
|
|
private const long c = 1013904223;
|
|
private const long m = 4294967296; // 2^32
|
|
|
|
private readonly byte[] _key;
|
|
|
|
private int _nextIndex;
|
|
|
|
private int _seed;
|
|
|
|
public RandomWithKey(byte[] key, int seed)
|
|
{
|
|
_key = key;
|
|
_seed = seed;
|
|
}
|
|
|
|
public int NextInt(int min, int max)
|
|
{
|
|
return min + NextInt(max - min);
|
|
}
|
|
|
|
public int NextInt(int max)
|
|
{
|
|
return (int)((uint)NextInt() % (uint)max);
|
|
}
|
|
|
|
private int GetNextKeyByte()
|
|
{
|
|
if (_nextIndex >= _key.Length)
|
|
{
|
|
_nextIndex = 0;
|
|
}
|
|
return _key[_nextIndex++];
|
|
}
|
|
|
|
public int NextInt()
|
|
{
|
|
_seed = (int)((a * _seed + c) % m);
|
|
return _seed ^ GetNextKeyByte();
|
|
}
|
|
|
|
public long NextLong()
|
|
{
|
|
return ((long)NextInt() << 32) | (uint)NextInt();
|
|
}
|
|
}
|
|
}
|