Exemple #1
0
        public void encryptmess(string mess)
        {
            if (mess.Length > 0)
            {
                md5 md5 = new md5();
                listBoxclient.Items.Add("Me: " + mess);
                Aes256 aes256 = new Aes256();
                SHA256 sha256 = SHA256Managed.Create();
                byte[] mess1  = Encoding.UTF8.GetBytes(mess);
                byte[] key1   = sha256.ComputeHash(Encoding.ASCII.GetBytes(Convert.ToString(dh.Key_Chung)));
                txtkey.Text = Convert.ToBase64String(key1);
                string ivc = getdatime();
                byte[] iv  = create_init_vector(ivc);
                txtiv.Text = Convert.ToBase64String(iv);
                byte[]   dayhash  = sha256.ComputeHash(Encoding.ASCII.GetBytes(ivc));
                string   encrypt  = aes256.EncryptString(mess1, key1, iv, dayhash);
                string[] enc1     = encrypt.Split(';');
                string   mess_md5 = md5.GetMD5(enc1[0] + Convert.ToString(dh.Key_Chung));

                string messsend = "Receive;" + encrypt + ";" + ivc + ";" + mess_md5;
                //string[] s1 = messsend.Split(';');
                //textBoxmessnoise.Text = s1[1].ToString() + ";" + s1[2].ToString() + ";" + s1[3].ToString();
                txtmessnoise.Text = messsend;
                senddata(messsend);
            }
        }
Exemple #2
0
        //Check MD5
        public bool check_md5(string encrypt, string md5_encrypt)
        {
            bool   check  = false;
            md5    md5    = new md5();
            string result = md5.GetMD5(encrypt + Convert.ToString(dh.Key_Chung));

            if (result == md5_encrypt)
            {
                check = true;
            }
            return(check);
        }
Exemple #3
0
        //Tính Padding
        public string tinhpading(string text)
        {
            md5    hash = new md5();
            string ivc  = getdatime();
            string chuoipading;

            int i = 0;
            int n = text.Length % 16;

            if (n != 0)
            {
                string thempading = hash.GetMD5(ivc).Substring(0, 16 - n);
                chuoipading = text + thempading;
            }
            else
            {
                chuoipading = text;
            }
            return(chuoipading);
        }