initial commit

Server.Helper/Xor.cs

@@ -0,0 +1,49 @@
+using System;
+
+namespace Server.Helper;
+
+internal class Xor
+{
+	public static byte[] DecodEncod(byte[] data, byte[] key)
+	{
+		int[] array = new int[256];
+		for (int i = 0; i < 256; i++)
+		{
+			array[i] = i;
+		}
+		int[] array2 = new int[256];
+		if (key.Length == 256)
+		{
+			Buffer.BlockCopy(key, 0, array2, 0, key.Length);
+		}
+		else
+		{
+			for (int j = 0; j < 256; j++)
+			{
+				array2[j] = key[j % key.Length];
+			}
+		}
+		int num = 0;
+		for (int k = 0; k < 256; k++)
+		{
+			num = (num + array[k] + array2[k]) % 256;
+			int num2 = array[k];
+			array[k] = array[num];
+			array[num] = num2;
+		}
+		int num3;
+		int num4 = (num3 = 0);
+		byte[] array3 = new byte[data.Length];
+		for (int l = 0; l < data.Length; l++)
+		{
+			num4 = (num4 + 1) % 256;
+			num3 = (num3 + array[num4]) % 256;
+			int num5 = array[num4];
+			array[num4] = array[num3];
+			array[num3] = num5;
+			int num6 = array[(array[num4] + array[num3]) % 256];
+			array3[l] = Convert.ToByte(data[l] ^ num6);
+		}
+		return array3;
+	}
+}