Decryption Key value not match
- by Jitendra Jadav
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;
}
}
}
