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Balavardhan Reddy Narani

Data Encryption and Decryption in asp.net

March 7 2009 , Written by Balavardhan Published on #ASP.Net

Data Encryption and Dcryption in C#,  ASP.Net

Required Datnet Namespaces

using System.Security.Cryptography;
using System.IO;
using System.Text;


Function to encrypt String

public static string Encrypt(string TextToBeEncrypted)
{
RijndaelManaged RijndaelCipher = new RijndaelManaged();
string Password = "CSC";
byte[] PlainText = System.Text.Encoding.Unicode.GetBytes(TextToBeEncrypted);
byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
//Creates a symmetric encryptor object.
ICryptoTransform Encryptor = RijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));
MemoryStream memoryStream = new MemoryStream();
//Defines a stream that links data streams to cryptographic transformations
CryptoStream cryptoStream = new CryptoStream(memoryStream, Encryptor, CryptoStreamMode.Write);
cryptoStream.Write(PlainText, 0, PlainText.Length);
//Writes the final state and clears the buffer
cryptoStream.FlushFinalBlock();
byte[] CipherBytes = memoryStream.ToArray();
memoryStream.Close();
cryptoStream.Close();
string EncryptedData = Convert.ToBase64String(CipherBytes);
return EncryptedData;

}


Function to Decrypt String

public static string Decrypt(string TextToBeDecrypted)
{

RijndaelManaged RijndaelCipher = new RijndaelManaged();
string Password = "CSC";
byte[] EncryptedData = Convert.FromBase64String(TextToBeDecrypted);
byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
//Making of the key for decryption
PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
//Creates a symmetric Rijndael decryptor object.
ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));
MemoryStream memoryStream = new MemoryStream(EncryptedData);
//Defines the cryptographics stream for decryption.THe stream contains decrpted data
CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);
byte[] PlainText = new byte[EncryptedData.Length];
int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);
memoryStream.Close();
cryptoStream.Close();
//Converting to string
string DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);
return DecryptedData;


}

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