public FormServer()
{
InitializeComponent();
aes = new Aes_256();
mySHA256 = SHA256Managed.Create();
Control.CheckForIllegalCrossThreadCalls = false;
}
public void encryptmess(string mess)
{
md5 = new MD5();
aes = new Aes_256();
mySHA256 = SHA256Managed.Create();
//array bytes message
byte[] mess1 = Encoding.UTF8.GetBytes(mess);
////array bytes key chung
byte[] key1 = mySHA256.ComputeHash(Encoding.ASCII.GetBytes(Convert.ToString(dh.Key_Chung)));
//get daytime
string ivc = getdatime();
//array bytes iv from daytime , start index 2
byte[] iv = create_init_vector(ivc, 2);
textBoxiv.Text = Convert.ToBase64String(iv);
//get 32 byte from datime for padding
byte[] dayhash = mySHA256.ComputeHash(Encoding.ASCII.GetBytes(ivc));
//encrypt message
string encrypt = aes.EncryptString(mess1, key1, iv, dayhash);
string[] enc1 = encrypt.Split(';');
string mess_md5 = md5.GetMD5(enc1[0] + Convert.ToString(dh.Key_Chung));
//byte[] enc = Encoding.ASCII.GetBytes(encrypt);
string messsend = "3;" + encrypt + ";" + ivc + ";" + mess_md5;
textBoxmessnoise.Text = messsend;
senddata(messsend);
}
