XTEA加密算法 for C#

以下是C#实现的XTEA加密算法代码：

public class XTEA
{
    private static uint[] key = { 0x12345678, 0x23456789, 0x34567890, 0x45678901 };

    public static byte[] Encrypt(byte[] data)
    {
        int padding = 8 - data.Length % 8;
        byte[] paddedData = new byte[data.Length + padding];
        Array.Copy(data, paddedData, data.Length);

        byte[] result = new byte[paddedData.Length];
        for (int i = 0; i < paddedData.Length; i += 8)
        {
            uint block1 = BitConverter.ToUInt32(paddedData, i);
            uint block2 = BitConverter.ToUInt32(paddedData, i + 4);

            uint sum = 0;
            uint delta = 0x9E3779B9;

            for (int j = 0; j < 32; j++)
            {
                block1 += ((block2 << 4 ^ block2 >> 5) + block2) ^ (sum + key[sum & 3]);
                sum += delta;
                block2 += ((block1 << 4 ^ block1 >> 5) + block1) ^ (sum + key[sum >> 11 & 3]);
            }

            byte[] encryptedBlock1 = BitConverter.GetBytes(block1);
            byte[] encryptedBlock2 = BitConverter.GetBytes(block2);
            Array.Copy(encryptedBlock1, 0, result, i, 4);
            Array.Copy(encryptedBlock2, 0, result, i + 4, 4);
        }

        return result;
    }

    public static byte[] Decrypt(byte[] data)
    {
        byte[] result = new byte[data.Length];
        for (int i = 0; i < data.Length; i += 8)
        {
            uint block1 = BitConverter.ToUInt32(data, i);
            uint block2 = BitConverter.ToUInt32(data, i + 4);

            uint sum = 0xC6EF3720;
            uint delta = 0x9E3779B9;

            for (int j = 0; j < 32; j++)
            {
                block2 -= ((block1 << 4 ^ block1 >> 5) + block1) ^ (sum + key[sum >> 11 & 3]);
                sum -= delta;
                block1 -= ((block2 << 4 ^ block2 >> 5) + block2) ^ (sum + key[sum & 3]);
            }

            byte[] decryptedBlock1 = BitConverter.GetBytes(block1);
            byte[] decryptedBlock2 = BitConverter.GetBytes(block2);
            Array.Copy(decryptedBlock1, 0, result, i, 4);
            Array.Copy(decryptedBlock2, 0, result, i + 4, 4);
        }

        int padding = result[result.Length - 1];
        byte[] unpaddedData = new byte[result.Length - padding];
        Array.Copy(result, unpaddedData, unpaddedData.Length);

        return unpaddedData;
    }
}

使用方法示例：

string data = "Hello World!";
byte[] encryptedData = XTEA.Encrypt(Encoding.UTF8.GetBytes(data));
byte[] decryptedData = XTEA.Decrypt(encryptedData);
string result = Encoding.UTF8.GetString(decryptedData);
Console.WriteLine(result); // 输出：Hello World!

注意：此代码仅作为示例供参考，实际使用时需要根据具体需求进行修改和优化。