aes加密解密算法c#

AES（Advanced Encryption Standard）是一种对称加密算法，常用于保护敏感数据的安全传输。在C#中，可以使用System.Security.Cryptography命名空间下的Aes类来进行AES加密和解密操作。以下是一个简单的示例：

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

public class AESExample
{
    private static readonly byte[] Salt = Encoding.ASCII.GetBytes("Your Salt Value"); // 随机盐值增加安全性
    private static Aes aes = Aes.Create();
    private static Rfc2898DeriveBytes keyDeriver = new Rfc2898DeriveBytes("Your Password", Salt); // 密钥从密码生成

    public static void Encrypt(string input, string outputFilePath)
    {
        aes.Key = keyDeriver.GetBytes(aes.KeySize / 8);
        aes.IV = keyDeriver.GetBytes(aes.BlockSize / 8);

        using (var encryptor = aes.CreateEncryptor())
        {
            using (var msOutput = new FileStream(outputFilePath, FileMode.Create))
            {
                var cryptoStream = new CryptoStream(msOutput, encryptor, CryptoStreamMode.Write);

                using (var sw = new StreamWriter(cryptoStream))
                {
                    sw.Write(input);
                }
            }
        }
    }

    public static string Decrypt(string inputFile, string outputFilePath)
    {
        try
        {
            aes.Key = keyDeriver.GetBytes(aes.KeySize / 8);
            aes.IV = keyDeriver.GetBytes(aes.BlockSize / 8);

            using (FileStream fsInput = File.OpenRead(inputFile))
            {
                using (var decryptor = aes.CreateDecryptor())
                {
                    using (CryptoStream cs = new CryptoStream(fsInput, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader sr = new StreamReader(cs))
                        {
                            return sr.ReadToEnd();
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            throw new Exception($"Error decrypting file: {ex.Message}");
        }
    }
}

// 使用示例:
string originalText = "Your Secret Text";
AESExample.Encrypt(originalText, "Encrypted.txt");
string decryptedText = AESExample.Decrypt("Encrypted.txt", "Decrypted.txt");