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Question

AES加密填充的問題，我開始了使用歐洲央行，因爲我聽說，這是開始，所以我創建了一個接受輸入加密一個控制檯應用程序最簡單的，然後將其解密，並同時輸出加密文本和解密的文本。這一切都很完美。我去嘗試使用CBC從頭創建一個新程序，我收到一個錯誤：「填充無效，無法刪除。」從我所看到的我所做的一切都是正確的，任何人都可以在正確的方向上指出我的問題可能是什麼？我曾試過在博客和本網站上找到的一切無濟於事。 DecryptData方法中的行DecryptedText = srDecrypt.ReadToEnd()發生異常。

RijndaelManaged rijm = new RijndaelManaged(); 
//more variables here 

    protected void Page_Load(object sender, EventsArgs e) 
    { 
     //Convert Key from string to Byte Array Here 

     rijm.BlockSize = 128; 
     rijm.KeySize = 256; 
     rijm.Key = keyByteArray; 
     rijm.Mode = CipherMode.CBC; 
     rijm.Padding = PaddingMode.PKCS7; 
     ICryptoTransform crypt = rijm.CreateEncryptor(keyByteArray, null); 

     using(crypt) 
     { 
      byte[] value1Cipher = EncryptData(crypt, value1); 
      byte[] value2Cihper = EncryptData(crypt, value2); 

      encryptedValue1 = Convert.ToBase64String(vaue1Cipher); 
      encrpytedValue2 = Convert.ToBase64String(value1Cipher); 
     } 

     ICryptoTransform decrypt = rijm.CreateDecryptor(keyByteArray, null); 

     using (decrypt) 
     { 
      decryptedValue1 = DecryptData(decrypt, encryptedValue1); //string 
      decryptedValue2 = DecryptData(decrypt, encrpytedValue2); //string 
     } 
     //... Do something with the values here. 
    } 
    private byte[] EncryptData(ICryptoTransform encrypt, string text) 
    { 
     var stream = new MemoryStream(); 
     using (var cryptoStream = new CryptoStream(stream, encrypt, CryptoStreamMode.Write)) 
     { 
      using (var writer = new StreamWriter(cryptoStream)) 
      { 
       writer.Write(text); 

      } 
     } 
     return stream.ToArray(); 
    } 

    private string DecryptData(ICryptoTransform decrypt, string cipherText) 
    { 
     string decryptedText = null; 
      byte[] text = Convert.FromBase64String(cipherText); 
      using (MemoryStream msDecrypt = new MemoryStream(text)) 
      using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decrypt, CryptoStreamMode.Read)) 
      using (StreamReader srDecrypt = new StreamReader(csDecrypt)) 
       decryptedText = srDecrypt.ReadToEnd(); 

     return decryptedText; 
    } 

Answer 1

既可以使用無參數CreateEncryptor()/CreateDecryptor()方法，或通過的IV。如果使用no-param版本，則應該致電CreateIV並將結果值存儲在.IV中。