c#文件操作怎样进行文件解密_运维文库_资讯中心

发布时间:2026-04-29 03:55:01

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在C#中，你可以使用System.IO和System.Security.Cryptography命名空间中的类和方法进行文件加密和解密操作。以下是一个简单的示例，展示了如何使用AES加密和解密文件。

首先，确保已安装System.Security.Cryptography NuGet包。

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

class FileEncryptionDecryption
{
    static void Main()
    {
        string inputFile = "input.txt";
        string outputFile = "output.txt";
        string key = "your-secret-key"; // 请使用一个安全的密钥
        string iv = "your-initial-vector"; // 请使用一个安全的初始向量

        // 加密文件
        EncryptFile(inputFile, outputFile, key, iv);

        // 解密文件
        DecryptFile(outputFile, "decrypted_output.txt", key, iv);
    }

    static void EncryptFile(string inputFile, string outputFile, string key, string iv)
    {
        using (Aes aes = Aes.Create())
        {
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.IV = Encoding.UTF8.GetBytes(iv);

            using (FileStream fs = new FileStream(inputFile, FileMode.Open))
            {
                using (CryptoStream cs = new CryptoStream(fs, aes.CreateEncryptor(), CryptoStreamMode.Read))
                {
                    using (FileStream encryptedStream = new FileStream(outputFile, FileMode.Create))
                    {
                        cs.CopyTo(encryptedStream);
                    }
                }
            }
        }
    }

    static void DecryptFile(string inputFile, string outputFile, string key, string iv)
    {
        using (Aes aes = Aes.Create())
        {
            aes.Key = Encoding.UTF8.GetBytes(key);
            aes.IV = Encoding.UTF8.GetBytes(iv);

            using (FileStream fs = new FileStream(inputFile, FileMode.Open))
            {
                using (CryptoStream cs = new CryptoStream(fs, aes.CreateDecryptor(), CryptoStreamMode.Read))
                {
                    using (FileStream decryptedStream = new FileStream(outputFile, FileMode.Create))
                    {
                        cs.CopyTo(decryptedStream);
                    }
                }
            }
        }
    }
}