mini4wdgp.cs

using System.IO;
using System.Security.Cryptography;

namespace Dimps.Thrust.Utility
{
	class Cryptography
	{
		private static readonly int s_keysize = 128; // 0x80
		private static readonly byte[] s_key = { 0xD5, 0x15, 0x31, 0x3B, 0xEC, 0xCA, 0xB0, 0xAD, 0x01, 0x9F, 0x24, 0xD9, 0xC4, 0xC6, 0x4F, 0x97 };
		private static readonly byte[] s_iv = { 0x9F, 0xE6, 0x59, 0x43, 0x77, 0x9D, 0xD0, 0xA0, 0xDE, 0x06, 0xF2, 0xE3, 0x16, 0x00, 0x5D, 0xCA };
		private static readonly byte s_mask = 0x45;

		private static void applyMask(byte[] array, byte mask)
		{
			for (int i = 0; i < array.Length; i++, mask++)
			{
				array[i] = (byte)(array[i] ^ mask);
			}
		}

		public static byte[] Decrypto(byte[] cipher) {
			var aes = Aes.Create();
			aes.KeySize = s_keysize;
			aes.Padding = PaddingMode.PKCS7;
			aes.Mode = CipherMode.CBC;

			applyMask(s_key, s_mask);
			applyMask(s_iv, s_mask);

			var decryptor = aes.CreateDecryptor(s_key, s_iv);
			return decryptor.TransformFinalBlock(cipher, 0, cipher.Length);
		}
	}

	class TestClass
	{
		static void Main()
		{
			string[] files = System.Environment.GetCommandLineArgs();

			for (int i = 1; i < files.Length; i++)
			{
				var bytes = File.ReadAllBytes(files[i]);
				bytes = Dimps.Thrust.Utility.Cryptography.Decrypto(bytes);
				File.WriteAllBytes(files[i] + ".json", bytes);
			}
		}
	}
}