公司學習平臺在app端下載下來的視頻需要加密

隨查找資料參考一些寫法

寫了aes的加密方法

記錄防止忘記

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 >= 1000static 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);}}}}} }

運行

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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");}

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轉載于:https://www.cnblogs.com/zhang888/p/4178501.html

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