.net aes加密视频等文件

公司学习平台在app端下载下来的视频需要加密

随查找资料参考一些写法

写了aes的加密方法

记录防止忘记

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Class1
    {
        private const string SKey = "_?73^?dVT3st5har3";
        private const string SaltKey = "!2S@LT&KT3st5har3EY";
        private const int Iterations = 1042; // Recommendation is >= 1000
        static byte[] GetBytes(string str)
        {
            var bytes = new byte[str.Length * sizeof(char)];
            Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
            return bytes;
        }
        static string GenerateKey()
        {
            // Create an instance of Symetric Algorithm. Key and IV is generated automatically.
            DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

            // Use the Automatically generated key for Encryption. 
            return ASCIIEncoding.ASCII.GetString(desCrypto.Key);

        }
        public static void EncryptFile(string srcFilename, string destFilename)
        {
            var aes = new AesManaged();
            aes.BlockSize = 128;
            aes.KeySize = 256;
            var salt = GetBytes(SaltKey);
            var key = new Rfc2898DeriveBytes(SKey, salt, Iterations);
            aes.Key = key.GetBytes(aes.KeySize / 8);
            aes.IV = key.GetBytes(aes.BlockSize / 8);
            aes.Mode = CipherMode.CBC;
            ICryptoTransform transform = aes.CreateEncryptor(aes.Key, aes.IV);
            using (var dest = new FileStream(destFilename, FileMode.CreateNew, FileAccess.Write, FileShare.None))
            {
                using (var cryptoStream = new CryptoStream(dest, transform, CryptoStreamMode.Write))
                {
                    using (var source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
                    {
                        source.CopyTo(cryptoStream);
                    }
                }
            }
        }
        public static void DecryptFile(string srcFilename, string destFilename)
        {
            var aes = new AesManaged();
            aes.BlockSize = 128;
            aes.KeySize = 256;
            var salt = GetBytes(SaltKey);
            var key = new Rfc2898DeriveBytes(SKey, salt, Iterations);
            aes.Key = key.GetBytes(aes.KeySize / 8);
            aes.IV = key.GetBytes(aes.BlockSize / 8);
            aes.Mode = CipherMode.CBC;
            ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);

            using (var dest = new FileStream(destFilename, FileMode.CreateNew, FileAccess.Write, FileShare.None))
            {
                using (var cryptoStream = new CryptoStream(dest, transform, CryptoStreamMode.Write))
                {
                    try
                    {
                        using (var source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
                        {
                            source.CopyTo(cryptoStream);
                        }
                    }
                    catch (CryptographicException exception)
                    {
                        throw new ApplicationException("Decryption failed.", exception);
                    }
                }
            }
        }
    }
}

运行

 

    static void Main(string[] args)
        {
           // Class1.EncryptFile(@"C:\kc_Page_2.mp4", @"C:\kc_Page_3.mp4");
            //Class1.DecryptFile(@"C:\kc_Page_3.mp4", @"C:\kc_Page_4.mp4");
            Class1.EncryptFile(@"C:\1.docx", @"C:\2.docx");
            Class1.DecryptFile(@"C:\2.docx", @"C:\3.docx");
    
        }