Encryption and Decryption

namespace RSACryptoPad
{
public class EncryptionThread
{
public static string EncryptData(string data, string password)
{
if (data == null)
throw new ArgumentNullException(Constants.dataMessage);
if (password == null)
throw new ArgumentNullException(Constants.passwordMessage);
byte[] encBytes = EncryptData(Encoding.UTF8.GetBytes(data), password, PaddingMode.ISO10126);
return Convert.ToBase64String(encBytes);
}

public static byte[] EncryptData(byte[] data, string password, PaddingMode paddingMode)
{
if (data == null || data.Length == 0)
throw new ArgumentNullException(Constants.dataMessage);
if (password == null)
throw new ArgumentNullException(Constants.passwordMessage);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, Encoding.UTF8.GetBytes(Constants.UTF8GetBytes));
RijndaelManaged rm = new RijndaelManaged();
rm.Padding = paddingMode;
ICryptoTransform encryptor = rm.CreateEncryptor(pdb.GetBytes(16), pdb.GetBytes(16));
using (MemoryStream msEncrypt = new MemoryStream())
using (CryptoStream encStream = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
encStream.Write(data, 0, data.Length);
encStream.FlushFinalBlock();
return msEncrypt.ToArray();
}
}

public static string DecryptData(string data, string password)
{
if (data == null)
throw new ArgumentNullException(Constants.dataMessage);
if (password == null)
throw new ArgumentNullException(Constants.passwordMessage);
byte[] encBytes = Convert.FromBase64String(data);
byte[] decBytes = DecryptData(encBytes, password, PaddingMode.ISO10126);
return Encoding.UTF8.GetString(decBytes);
}

public static byte[] DecryptData(byte[] data, string password, PaddingMode paddingMode)
{
if (data == null || data.Length == 0)
throw new ArgumentNullException(Constants.dataMessage);
if (password == null)
throw new ArgumentNullException(Constants.passwordMessage);
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, Encoding.UTF8.GetBytes(Constants.UTF8GetBytes));
RijndaelManaged rm = new RijndaelManaged();
rm.Padding = paddingMode;
ICryptoTransform decryptor = rm.CreateDecryptor(pdb.GetBytes(16), pdb.GetBytes(16));
using (MemoryStream msDecrypt = new MemoryStream(data))
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
// Decrypted bytes will always be less then encrypted bytes, so len of encrypted data will be big enouph for buffer.
byte[] fromEncrypt = new byte[data.Length];
// Read as many bytes as possible.
int read = csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
if (read < fromEncrypt.Length)
{
// Return a byte array of proper size.
byte[] clearBytes = new byte[read];
Buffer.BlockCopy(fromEncrypt, 0, clearBytes, 0, read);
return clearBytes;
}
return fromEncrypt;
}
}
}
}