解密密鑰值不匹配

Question

public class TrippleENCRSPDESCSP 
{ 


    public TrippleENCRSPDESCSP() 
    { 

    } 

    public void EncryptIt(string sData,ref byte[] sEncData,ref byte[] Key1,ref byte[] Key2) 
    { 
     try 
     { 
      // Create a new TripleDESCryptoServiceProvider object 
      // to generate a key and initialization vector (IV). 
      TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); 

      // Create a string to encrypt. 

      // Encrypt the string to an in-memory buffer. 
      byte[] Data = EncryptTextToMemory(sData,tDESalg.Key,tDESalg.IV); 
      sEncData = Data; 
      Key1 = tDESalg.Key; 
      Key2 = tDESalg.IV; 


     } 
     catch (Exception) 
     { 

      throw; 
     } 


    } 

    public string DecryptIt(byte[] sEncData) 
    { 

     //byte[] toEncrypt = new ASCIIEncoding().GetBytes(sEncData); 

     //XElement xParser = null; 
     //XmlDocument xDoc = new XmlDocument(); 

     try 
     { 
      //string Final = ""; 
      string sPwd = null; 
      string sKey1 = null; 
      string sKey2 = null; 
      //System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); 
      string soutxml = ""; 

      //soutxml = encoding.GetString(sEncData); 
      soutxml = ASCIIEncoding.ASCII.GetString(sEncData); 
      sPwd = soutxml.Substring(18, soutxml.LastIndexOf("</EncPwd>") - 18); 
      sKey1 = soutxml.Substring(18 + sPwd.Length + 15, soutxml.LastIndexOf("</Key1>") - (18 + sPwd.Length + 15)); 
      sKey2 = soutxml.Substring(18 + sPwd.Length + 15 + sKey1.Length + 13, soutxml.LastIndexOf("</Key2>") - (18 + sPwd.Length + 15 + sKey1.Length + 13)); 



      //xDoc.LoadXml(soutxml); 

      //xParser = XElement.Parse(soutxml); 

     //IEnumerable<XElement> elemsValidations = 
     //  from el in xParser.Elements("EmailPwd") 
     //  select el; 


      #region OldCode 
      //XmlNodeList objXmlNode = xDoc.SelectNodes("EmailPwd"); 

      //foreach (XmlNode xmllist in objXmlNode) 
      //{ 
      // XmlNode xmlsubnode; 
      // xmlsubnode = xmllist.SelectSingleNode("EncPwd"); 
      // xmlsubnode = xmllist.SelectSingleNode("Key1"); 
      // xmlsubnode = xmllist.SelectSingleNode("Key2"); 
      //} 

      #endregion 

     //foreach (XElement elemValidation in elemsValidations) 
     //{ 
     // sPwd = elemValidation.Element("EncPwd").Value; 
     // sKey1 = elemValidation.Element("Key1").Value; 
     // sKey2 = elemValidation.Element("Key2").Value; 
     //} 

      //byte[] Key1 = encoding.GetBytes(sKey1); 
      //byte[] Key2 = encoding.GetBytes(sKey2); 
      //byte[] Data = encoding.GetBytes(sPwd); 


      byte[] Key1 = ASCIIEncoding.ASCII.GetBytes(sKey1); 
      byte[] Key2 = ASCIIEncoding.ASCII.GetBytes(sKey2); 
      byte[] Data = ASCIIEncoding.ASCII.GetBytes(sPwd); 

      // Decrypt the buffer back to a string. 
      string Final = DecryptTextFromMemory(Data, Key1, Key2); 

      return Final; 
     } 
     catch (Exception) 
     { 

      throw; 
     } 

    } 

    public static byte[] EncryptTextToMemory(string Data,byte[] Key,byte[] IV) 
    { 
     try 
     { 
      // Create a MemoryStream. 
      MemoryStream mStream = new MemoryStream(); 

      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV). 
      CryptoStream cStream = new CryptoStream(mStream, 
       new TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), 
       CryptoStreamMode.Write); 

      // Convert the passed string to a byte array. 
      //byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data); 
      byte[] toEncrypt = ASCIIEncoding.ASCII.GetBytes(Data); 
      // Write the byte array to the crypto stream and flush it. 
      cStream.Write(toEncrypt, 0, toEncrypt.Length); 
      cStream.FlushFinalBlock(); 

      // Get an array of bytes from the 
      // MemoryStream that holds the 
      // encrypted data. 
      byte[] ret = mStream.ToArray(); 

      // Close the streams. 
      cStream.Close(); 
      mStream.Close(); 

      // Return the encrypted buffer. 
      return ret; 
     } 
     catch (CryptographicException e) 
     { 
      MessageBox.Show("A Cryptographic error occurred: {0}", e.Message); 
      return null; 
     } 
    } 

    public static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV) 
    { 
     try 
     { 
      // Create a new MemoryStream using the passed 
      // array of encrypted data. 
      MemoryStream msDecrypt = new MemoryStream(Data); 

      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV). 
      CryptoStream csDecrypt = new CryptoStream(msDecrypt, 
      new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), 
      CryptoStreamMode.Write); 

      csDecrypt.Write(Data, 0, Data.Length); 
      //csDecrypt.FlushFinalBlock(); 
      msDecrypt.Position = 0; 

      // Create buffer to hold the decrypted data. 
      byte[] fromEncrypt = new byte[msDecrypt.Length]; 

      // Read the decrypted data out of the crypto stream 
      // and place it into the temporary buffer. 
      msDecrypt.Read(fromEncrypt, 0, msDecrypt.ToArray().Length); 
      //csDecrypt.Close(); 
      MessageBox.Show(ASCIIEncoding.ASCII.GetString(fromEncrypt)); 
      //Convert the buffer into a string and return it. 
      return new ASCIIEncoding().GetString(fromEncrypt); 

     } 
     catch (CryptographicException e) 
     { 
      MessageBox.Show("A Cryptographic error occurred: {0}", e.Message); 
      return null; 
     } 
    } 

} 

Answer 1

用於加密文件的相同密鑰（密鑰）和初始化向量（IV）必須用於對其進行解密。我不能完全當前檢查這個代碼，所以可能會有一個兩個小問題，但給它一個嘗試，讓我知道，如果它的作品，希望你的想法：

public static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV) 
{ 
    try 
    { 
     // Create a new MemoryStream using the passed 
     // array of encrypted data. 
     MemoryStream msDecrypt = new MemoryStream(); 

     // Create a CryptoStream using the MemoryStream 
     // and the passed key and initialization vector (IV). 
     CryptoStream csDecrypt = new CryptoStream(msDecrypt, 
     new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), 
     CryptoStreamMode.Write); 

     csDecrypt.Write(Data, 0, Data.Length); 
     csDecrypt.FlushFinalBlock(); 
     msDecrypt.Position = 0; 

     // Create buffer to hold the decrypted data. 
     byte[] fromEncrypt = new byte[msDecrypt.Length]; 

     // Read the decrypted data out of the crypto stream 
     // and place it into the temporary buffer. 
     msDecrypt.Read(fromEncrypt, 0, msDecrypt.ToArray().Length); 
     csDecrypt.Close(); 

     //Convert the buffer into a string and return it. 
     return new UTF8Encoding().GetString(fromEncrypt); 
    } 
    catch (CryptographicException e) 
    { 
     MessageBox.Show("A Cryptographic error occurred: {0}", e.Message); 
     return null; 
    } 
}