另一個'要解密的數據長度無效'。錯誤

Question

我收到'解密數據的長度無效'。嘗試解密字符串時出錯。我在本網站上查看了一些其他對此錯誤的引用，並嘗試了一些在那裏找到的建議，但迄今爲止沒有任何工作。

我確定我錯過了一些基本的東西，但我看不到它是什麼。

我在加密和解密時使用了相同的密鑰和IV。我在加密和解密時添加了FlushFinalBlock()調用。我甚至試圖設置encryptStream.Position = 0，但是會拋出ObjectDisposedException。

我創建了一個控制檯應用程序來說明問題。該代碼的全部內容如下：

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

namespace Crypto 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      _CryptoString = AESStringEncryption(CRYPTO_STRING); 
      _CryptoString = AESStringDecryption(_CryptoString); 
     } 

     private const string CRYPTO_STRING = "The quick brown fox jumped over the lazy dog."; 

     private static byte[] _KY = { 47, 53, 94, 65, 243, 197, 42, 80, 125, 255, 144, 41, 130, 76, 2, 142, 43, 1, 120, 124, 255, 248, 232, 139, 170, 42, 243, 52, 4, 17, 60, 174 }; 
     private static byte[] _VI = { 68, 42, 157, 47, 99, 8, 174, 169, 119, 255, 144, 218, 8, 30, 60, 42 }; 

     private static string _CryptoString; 

     /// <summary> 
     /// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided string parameter. 
     /// Utilizies the UTF8 encoding stardard for the conversion from string to byte[]. 
     /// </summary> 
     public static string AESStringEncryption(string unencryptedString) 
     { 
      byte[] unencryptedBytes = Encoding.UTF8.GetBytes(unencryptedString); 
      byte[] encryptedBytes = AESByteArrayEncryption(unencryptedBytes); 
      string encryptedString = Encoding.UTF8.GetString(encryptedBytes); 

      return encryptedString; 
     } 

     /// <summary> 
     /// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided string parameter. 
     /// Utilizies the UTF8 encoding stardard for the conversion from byte[] to string. 
     /// </summary> 
     public static string AESStringDecryption(string encryptedString) 
     { 
      byte[] encryptedBytes = Encoding.UTF8.GetBytes(encryptedString); 
      byte[] decryptedBytes = AESByteArrayDecryption(encryptedBytes); 
      string decryptedString = Encoding.UTF8.GetString(decryptedBytes); 

      return decryptedString; 
     } 

     /// <summary> 
     /// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided byte array parameter. 
     /// </summary> 
     public static byte[] AESByteArrayEncryption(byte[] unencryptedBytes) 
     { 
      using (var rm = new RijndaelManaged()) 
      { 
       var encryptor = rm.CreateEncryptor(_KY, _VI); 
       using (var encryptStream = new MemoryStream()) 
       { 
        using (var cryptoStream = new CryptoStream(encryptStream, encryptor, CryptoStreamMode.Write)) 
        { 
         cryptoStream.Write(unencryptedBytes, 0, unencryptedBytes.Length); 
         cryptoStream.FlushFinalBlock(); 
        } 

        //encryptStream.Position = 0; 

        byte[] encryptedBytes = encryptStream.ToArray(); 

        return encryptedBytes; 
       } 
      } 
     } 

     /// <summary> 
     /// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided byte array parameter. 
     /// </summary> 
     public static byte[] AESByteArrayDecryption(byte[] encryptedBytes) 
     { 
      using (var rm = new RijndaelManaged()) 
      { 
       var decryptor = rm.CreateDecryptor(_KY, _VI); 
       using (var decryptStream = new MemoryStream()) 
       { 
        using (var cryptoStream = new CryptoStream(decryptStream, decryptor, CryptoStreamMode.Write)) 
        { 
         cryptoStream.Write(encryptedBytes, 0, encryptedBytes.Length); 
         cryptoStream.FlushFinalBlock(); 
        } 

        //decryptStream.Position = 0; 

        byte[] decryptedBytes = decryptStream.ToArray(); 

        return decryptedBytes; 
       } 
      } 
     } 
    } 
} 

Answer 1

您無法將二進制數組轉換爲UTF-8 - 它們不是同一件事。改用Base64。

裏面的加密方法，倒數第二行應該是：

string encryptedString = Convert.ToBase64String(encryptedBytes); 

和解密方法，第一行是：

byte[] encryptedBytes = Convert.FromBase64String(encryptedString);