Encrypt and Decrypt Xml and Text File

using System.Security.Cryptography;

/* System.Security.Cryptography namespace
Microsoft provides cryptographic services, including secure encoding and decoding of data.
*/
//hash algorithm are applied to encrpt the string and store in un-readable format..

public XmlDocument OpenXmlDocument(String filePath)//Decrypt Xml File
{
bool useHashing = true;
string Key = "Subhash";
byte[] keyArray;
StreamReader sr = new StreamReader(filePath);//here we read the file of given Path
String str = sr.ReadToEnd();
sr.Close();
byte[] toEncryptArray = Convert.FromBase64String(str);//convert string into ByteArray

if (useHashing){

//All Hash function take input of type Byte[]
//To generate a hash value, create an instance of a hash algorithm and call ComputeHash() on it.
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

//The ComputeHash method accepts only an array of bytes or a stream..

keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(Key));//key also convert into ByteArray
hashmd5.Clear();//Releases all resources used by the HashAlgorithm class
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(Key);

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();//Data Encryption/Decpription Standard
tdes.Key = keyArray;//Gets or sets the secret key for the TripleDES algorithm.
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateDecryptor();//for Decrypting Data
//TransformFinalBlock:Transforms(Change) the specified region of the specified byte array.
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
string xmlData = UTF8Encoding.UTF8.GetString(resultArray);
XmlDocument xDoc = new XmlDocument();
xDoc.LoadXml(xmlData);

return xDoc;

}
public void SaveXmlDocument(XmlDocument xmldocument, string FilePath, bool EncryptXmlFile)//EncryptXmlFile will be true
{
// bool useHashing = true;
byte[] keyArray;
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(xmldocument.OuterXml);//convert Xml file into ByteArray
string Key = "Subhash"; //set the key here for encrypting
if (EncryptXmlFile)
{
//To generate a hash value, create an instance of a hash algorithm and call ComputeHash() on it.
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

//The ComputeHash method accepts only an array of bytes or a stream..

keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(Key));//key also convert into ByteArray
hashmd5.Clear();//Releases all resources used by the HashAlgorithm class
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(Key);//convert into ByteArray

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;//Gets or sets the secret key for the TripleDES algorithm.
tdes.Mode = CipherMode.ECB;//Gets or sets the mode for operation of the symmetric algorithm
tdes.Padding = PaddingMode.PKCS7;//Gets or sets the padding mode used in the symmetric algorithm.

ICryptoTransform cTransform = tdes.CreateEncryptor();//for Encrypting Data.
//TransformFinalBlock:Transforms(Change) the specified region of the specified byte array.
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
StreamWriter _sw = new StreamWriter(FilePath);//For write Encrypted file into given Path
_sw.WriteLine(Convert.ToBase64String(resultArray, 0, resultArray.Length));
_sw.Flush();
_sw.Close();
_sw.Dispose();
}
public void SaveTextDocument(string Textdocument, string FilePath, bool EncryptTextFile)//EncryptTextFile will be true
{
// bool useHashing = true;
byte[] keyArray;
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(Textdocument);//convert Text file into ByteArray
string Key = "Subhash"; //set the key here for encrypting
if (EncryptTextFile)
{
//To generate a hash value, create an instance of a hash algorithm and call ComputeHash() on it.
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

//The ComputeHash method accepts only an array of bytes or a stream..

keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(Key));//key also convert into ByteArray
hashmd5.Clear();//Releases all resources used by the HashAlgorithm class
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(Key);//convert into ByteArray

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;//Gets or sets the secret key for the TripleDES algorithm.
tdes.Mode = CipherMode.ECB;//Gets or sets the mode for operation of the symmetric algorithm
tdes.Padding = PaddingMode.PKCS7;//Gets or sets the padding mode used in the symmetric algorithm.

ICryptoTransform cTransform = tdes.CreateEncryptor();//for Encrypting Data.
//TransformFinalBlock:Transforms(Change) the specified region of the specified byte array.
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
StreamWriter _sw = new StreamWriter(FilePath);//For write Encrypted file into given Path
_sw.WriteLine(Convert.ToBase64String(resultArray, 0, resultArray.Length));
_sw.Flush();
_sw.Close();
_sw.Dispose();
}


protected void btnGenerateXml_Click(object sender, EventArgs e)
{
string FilePath = Path.Combine(Path.Combine(AppDomain.CurrentDomain.BaseDirectory.ToString(), "Configuration"), "QueryMaster.xml");
//........for check if xml file before Encryption
StreamReader sr = new StreamReader(FilePath);
String str = sr.ReadToEnd();
sr.Close();
string[] k = str.Split(' ');
string s = k[0];
if (str.Contains("<"))
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(FilePath);
SaveXmlDocument(xmlDoc, FilePath, true);
}

//...........................
//if (s == " // {

// }

}


protected void Read_Click(object sender, EventArgs e)
{
string FilePath = Path.Combine(Path.Combine(AppDomain.CurrentDomain.BaseDirectory.ToString(), "Configuration"), "QueryMaster.xml");
XmlDocument xResultDoc = OpenXmlDocument(FilePath);
}
protected void btnGenerateText_Click(object sender, EventArgs e)
{
string FilePath1 = Path.Combine(Path.Combine(AppDomain.CurrentDomain.BaseDirectory.ToString(), "Configuration"), "a.txt");
StreamReader streamReader = new StreamReader(FilePath1);
string text = streamReader.ReadToEnd();
streamReader.Close();
SaveTextDocument(text, FilePath1, true);
}
protected void btnReadText_Click(object sender, EventArgs e)
{
string FilePath = Path.Combine(Path.Combine(AppDomain.CurrentDomain.BaseDirectory.ToString(), "Configuration"), "a.txt");
string xResultDoc = OpenTextDocument(FilePath);
}
public string OpenTextDocument(String filePath) //Decrypt text File
{
bool useHashing = true;
string Key = "Subhash";
byte[] keyArray;
StreamReader sr = new StreamReader(filePath);//here we read the file of given Path
String str = sr.ReadToEnd();
sr.Close();
byte[] toEncryptArray = Convert.FromBase64String(str);//convert string into ByteArray

if (useHashing)
{

//All Hash function take input of type Byte[]
//To generate a hash value, create an instance of a hash algorithm and call ComputeHash() on it.
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

//The ComputeHash method accepts only an array of bytes or a stream..

keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(Key));//key also convert into ByteArray
hashmd5.Clear();//Releases all resources used by the HashAlgorithm class
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(Key);

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();//Data Encryption/Decpription Standard
tdes.Key = keyArray;//Gets or sets the secret key for the TripleDES algorithm.
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateDecryptor();//for Decrypting Data
//TransformFinalBlock:Transforms(Change) the specified region of the specified byte array.
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();

string s= UTF8Encoding.UTF8.GetString(resultArray);
return s;


//string xmlData = UTF8Encoding.UTF8.GetString(resultArray);
//XmlDocument xDoc = new XmlDocument();
//xDoc.LoadXml(xmlData);
//return xDoc;

}