C#盐加密解密

C#中的盐加密解密可以使用以下步骤：

1. 生成一个随机的盐值
2. 将盐值与要加密的数据进行拼接
3. 使用某种加密算法（如AES）对拼接后的字符串进行加密
4. 将盐值和加密后的数据一起存储

解密时，需要先取出盐值，然后使用相同的加密算法对剩余部分进行解密。以下是一个示例代码：

using System;
using System.Security.Cryptography;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        string password = "password123";
        string salt = GenerateSalt();
        string encryptedPassword = EncryptPassword(password, salt);

        Console.WriteLine("Original password: " + password);
        Console.WriteLine("Salt: " + salt);
        Console.WriteLine("Encrypted password: " + encryptedPassword);

        string decryptedPassword = DecryptPassword(encryptedPassword, salt);
        Console.WriteLine("Decrypted password: " + decryptedPassword);
    }

    static string GenerateSalt()
    {
        byte[] saltBytes = new byte[16];
        using (var rng = new RNGCryptoServiceProvider())
        {
            rng.GetBytes(saltBytes);
        }
        return Convert.ToBase64String(saltBytes);
    }

    static string EncryptPassword(string password, string salt)
    {
        byte[] saltBytes = Convert.FromBase64String(salt);
        byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
        byte[] combinedBytes = new byte[saltBytes.Length + passwordBytes.Length];

        Buffer.BlockCopy(saltBytes, 0, combinedBytes, 0, saltBytes.Length);
        Buffer.BlockCopy(passwordBytes, 0, combinedBytes, saltBytes.Length, passwordBytes.Length);

        byte[] encryptedBytes;
        using (var aes = Aes.Create())
        {
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            aes.GenerateIV();
            aes.Key = Encoding.UTF8.GetBytes("mysecretpassword12345");

            using (var encryptor = aes.CreateEncryptor())
            {
                encryptedBytes = encryptor.TransformFinalBlock(combinedBytes, 0, combinedBytes.Length);
            }
        }

        return Convert.ToBase64String(encryptedBytes);
    }

    static string DecryptPassword(string encryptedPassword, string salt)
    {
        byte[] saltBytes = Convert.FromBase64String(salt);
        byte[] encryptedBytes = Convert.FromBase64String(encryptedPassword);

        byte[] decryptedBytes;
        using (var aes = Aes.Create())
        {
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;

            aes.Key = Encoding.UTF8.GetBytes("mysecretpassword12345");
            aes.IV = encryptedBytes.Take(16).ToArray();

            using (var decryptor = aes.CreateDecryptor())
            {
                decryptedBytes = decryptor.TransformFinalBlock(encryptedBytes, 16, encryptedBytes.Length - 16);
            }
        }

        byte[] passwordBytes = new byte[decryptedBytes.Length - saltBytes.Length];
        Buffer.BlockCopy(decryptedBytes, saltBytes.Length, passwordBytes, 0, passwordBytes.Length);

        return Encoding.UTF8.GetString(passwordBytes);
    }
}

注意，上述代码中的密码和加密密钥应该使用更加安全的方式进行管理，例如将其存储在安全的密钥库中。