Method DecryptData

StaticData/NikkeStaticData/Program.cs:107–160

(byte[] encryptedData, byte[] key, bool ctr = false)

	}

	private static byte[] DecryptData(byte[] encryptedData, byte[] key, bool ctr = false)
	{
		byte[] aesKey = key.Take(16).ToArray();
		byte[] iv = key.Skip(key.Length - 16).ToArray();

		if (!ctr)
		{
			using var aes = Aes.Create();
			aes.KeySize = 128;
			aes.BlockSize = 128;
			aes.Key = aesKey;
			aes.IV = iv;
			aes.Mode = CipherMode.CBC;
			aes.Padding = PaddingMode.None;

			using var ms = new MemoryStream();
			using var cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write);
			cs.Write(encryptedData, 0, encryptedData.Length);
			cs.FlushFinalBlock();
			return ms.ToArray();
		}
		else
		{
			using var aes = Aes.Create();
			aes.KeySize = 128;
			aes.BlockSize = 128;
			aes.Mode = CipherMode.ECB;
			aes.Padding = PaddingMode.None;
			aes.Key = aesKey;

			using var encryptor = aes.CreateEncryptor();
			using var ms = new MemoryStream();

			byte[] counter = (byte[])iv.Clone();
			byte[] buffer = new byte[16];
			byte[] keystreamBlock = new byte[16];

			for (int i = 0; i < encryptedData.Length; i += 16)
			{
				encryptor.TransformBlock(counter, 0, 16, keystreamBlock, 0);

				int blockSize = Math.Min(16, encryptedData.Length - i);
				for (int j = 0; j < blockSize; j++)
				{
					buffer[j] = (byte)(encryptedData[i + j] ^ keystreamBlock[j]);
				}

				ms.Write(buffer, 0, blockSize);
				IncrementCounter(counter);
			}

			return ms.ToArray();
		}
	}

	private static void IncrementCounter(byte[] counter)
	{