How to encryt and decrypt xml in c#

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C#

XML

Hi,

I stuck in the problem may be some can help.

i write this code

XDocument doc = XDocument.Load(Filepath of any xml file");
string readxml = doc.ToString();
string swapnil = Encrypt(readxml);
XDocument doc1 = XDocument.Parse(swapnil);
string avi = Decrypt(swapnil);

using xdocument i load a xml file
then in readxml i am reading xdocument as string because i have methods for encrytion and decrytion that accept string.
in swapnil string i have encrypted the data. but again i want to convert the string into xdocument type. but when i am converting getting this error.

Data at the root level is invalid. Line 1, position 1.

below is methods for encrytion and decryption


private readonly Rfc2898DeriveBytes _DeriveBytes;
private readonly byte[] _InitVectorBytes;
private readonly byte[] _KeyBytes;
private const string InitVector = "T=A4rAzu94ez-dra";
private const int PasswordIterations = 1000; //2;
private const string SaltValue = "d=?ustAF=UstenAr3B@pRu8=ner5sW&h59_Xe9P2za-eFr2fa&ePHE@ras!a+uc@";

public string Decrypt(string encryptedText)
{
byte[] encryptedTextBytes = Convert.FromBase64String(encryptedText);
string plainText;

RijndaelManaged rijndaelManaged = new RijndaelManaged { Mode = CipherMode.CBC };

try
{
using (ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(_KeyBytes, _InitVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream(encryptedTextBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
//TODO: Need to look into this more. Assuming encrypted text is longer than plain but there is probably a better way
byte[] plainTextBytes = encryptedTextBytes; /*new byte[encryptedTextBytes.Length];*/

int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
}
}
}
catch (CryptographicException exception)
{
plainText = string.Empty; // Assume the error is caused by an invalid password
}

return plainText;
}

public string Encrypt(string plainText)
{
string encryptedText;
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

RijndaelManaged rijndaelManaged = new RijndaelManaged { Mode = CipherMode.CBC };

using (ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(_KeyBytes, _InitVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();

byte[] cipherTextBytes = memoryStream.ToArray();
encryptedText = Convert.ToBase64String(cipherTextBytes);
}
}
}

return encryptedText;
}

using this method i want to encrypt and decrypt.

please help me.