C#WebAPI如何处理数据加密解密

在C# Web API中处理数据加密和解密，可以使用多种加密算法。以下是一个使用AES加密和解密的示例：

1. 首先，安装System.Security.Cryptography命名空间中的Aes类：

using System.Security.Cryptography;

2. 创建一个加密方法，用于加密数据：

public static string Encrypt(string data, string key)
{
    byte[] clearBytes = Encoding.Unicode.GetBytes(data);

    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes("YourSalt", new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);

        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
            {
                cs.Write(clearBytes, 0, clearBytes.Length);
                cs.Close();
            }

            data = Convert.ToBase64String(ms.ToArray());
        }
    }

    return data;
}

3. 创建一个解密方法，用于解密数据：

public static string Decrypt(string data, string key)
{
    byte[] cipherBytes = Convert.FromBase64String(data);

    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes("YourSalt", new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);

        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }

            data = Encoding.Unicode.GetString(ms.ToArray());
        }
    }

    return data;
}

4. 在你的API控制器中，使用这些方法对数据进行加密和解密：

[HttpPost]
public IHttpActionResult EncryptData([FromBody] string data)
{
    string encryptedData = Encrypt(data, "YourKey");
    return Ok(encryptedData);
}

[HttpPost]
public IHttpActionResult DecryptData([FromBody] string data)
{
    string decryptedData = Decrypt(data, "YourKey");
    return Ok(decryptedData);
}

请注意，这个示例使用了AES加密算法和Rfc2898DeriveBytes类来生成密钥和初始化向量（IV）。你可以根据需要选择其他加密算法。同时，确保在实际应用中使用安全的密钥和盐值。