/// <summary>
/// A method to Encrypt/decrypt a specified Triple DES encrypted file using the
/// key and iv provided.
/// สำหรับ Encrypt ข้อมูล อื่นๆ ที่ไม่ใช้ Password สามารถถอดรหัสได้
/// </summary>
private string EncryptData(string plainMessage, string password)
{
if (Varidation.IsEmpty(plainMessage))
{
return("");
}
try
{
password = GetEncoding(privateKey, password);
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
des.IV = new byte[8];
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, new byte[0]);
des.Key = pdb.CryptDeriveKey("RC2", "MD5", 128, new byte[8]);
MemoryStream ms = new MemoryStream(plainMessage.Length * 2);
CryptoStream encStream = new CryptoStream(ms, des.CreateEncryptor(),
CryptoStreamMode.Write);
byte[] plainBytes = Encoding.UTF8.GetBytes(plainMessage);
encStream.Write(plainBytes, 0, plainBytes.Length);
encStream.FlushFinalBlock();
byte[] encryptedBytes = new byte[ms.Length];
ms.Position = 0;
ms.Read(encryptedBytes, 0, (int)ms.Length);
encStream.Close();
return(Convert.ToBase64String(encryptedBytes));
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
/// <summary>
/// A method to Encrypt/decrypt a specified Triple DES encrypted file using the
/// key and iv provided.
/// สำหรับ Decrypt ข้อมูล
/// </summary>
private string DecryptData(string encryptedBase64, string password)
{
if (Varidation.IsEmpty(encryptedBase64))
{
return("");
}
try
{
password = GetEncoding(privateKey, password);
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
des.IV = new byte[8];
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, new byte[0]);
des.Key = pdb.CryptDeriveKey("RC2", "MD5", 128, new byte[8]);
byte[] encryptedBytes = Convert.FromBase64String(encryptedBase64);
MemoryStream ms = new MemoryStream(encryptedBase64.Length);
CryptoStream decStream = new CryptoStream(ms, des.CreateDecryptor(),
CryptoStreamMode.Write);
decStream.Write(encryptedBytes, 0, encryptedBytes.Length);
decStream.FlushFinalBlock();
byte[] plainBytes = new byte[ms.Length];
ms.Position = 0;
ms.Read(plainBytes, 0, (int)ms.Length);
decStream.Close();
return(Encoding.UTF8.GetString(plainBytes));
}
catch (Exception e)
{
//throw new NotImplementedException();
//return Redirect(res.Pageviews.PvNotFound);
//throw new Exception("Can't convert because data type of column " + columnDestination + " is not String!");
throw new Exception(e.Message);
}
}
/// <summary>
/// ส่งข้อมูลที่ทำการแปลงข้อมูลให้อยู่ใน รูปของการ Encode แล้ว
/// </summary>
string Authenticate(string userPwd)
{
if (Varidation.IsEmpty(userPwd))
{
return("");
}
// Should we create a hash for the password?
if (userPwd.Length > 0)
{
userPwd = HashData(userPwd);
}
return(userPwd);
}