/*
* public static BigInteger Pow(BigInteger value, BigInteger exponent)
* {
* BigInteger originalValue = value;
* while (exponent-- > 1)
* value = BigInteger.Multiply(value, originalValue);
* return value;
* }*/
public static MyRSAProvider.MyMyKeys GenerateKey(int Keysize)
{
//initialize constructor
MyRSAProvider.MyMyKeys MyKeys = new MyRSAProvider.MyMyKeys();
//Get prime P
P = GetPrime(Keysize);
//Get prime Q
Q = GetPrime(Keysize);
//calculate the modulus
N = GetN(P, Q);
//calculate the totient or phi
To = GetTotient(P, Q);
// Get the value of the public exponent...(65537)
E = GetE();
//compute the value of the private exponent such that (D*E % To) = 1
D = GetD(E, To);
//calculate other properties of the private and public keys to be used in chinese remender theorem
Dp = D % (P - 1);
Dq = D % (Q - 1);
Ep = E % (P - 1);
Eq = E % (Q - 1);
Qinv = GetD(Q, P);
//get the keysize into our constructor
MyKeys.KeySize = Keysize;
//do checks to see that everything is in other else calculate again
if (P == 0 || Q == 0 || N == 0 || To == 0 || D == 0 || P == Q || (D * E % To) != 1)
{
GenerateKey(Keysize);
}
//Add the private key values to the constructor
MyKeys.PrivateKey.Add(new MyRSAProvider.PrivateKey {
D = D.ToString(), N = N.ToString(), Dp = Dp.ToString(), Dq = Dq.ToString(), Qinv = Qinv.ToString(), P = P.ToString(), Q = Q.ToString()
});
//Add the public key values to the constructor
MyKeys.PublicKey.Add(new MyRSAProvider.PublicKey {
E = E.ToString(), N = N.ToString(), Ep = Ep.ToString(), Eq = Eq.ToString(), Qinv = Qinv.ToString(), P = P.ToString(), Q = Q.ToString()
});
return(MyKeys);
}
private async void Sign_Up_Click(object sender, RoutedEventArgs e)
{
Stopwatch keyGenTime = new Stopwatch();
if (!string.IsNullOrWhiteSpace(Name.Text) && !string.IsNullOrWhiteSpace(Username.Text) && !string.IsNullOrWhiteSpace(Password.Password) && !string.IsNullOrWhiteSpace(ConfirmPassword.Password))
{
if (string.Equals(Password.Password, ConfirmPassword.Password))
{
int SelectedKeySize = int.Parse(KeySizeBox.Text);
MyRSAProvider.MyMyKeys rsa = new MyRSAProvider.MyMyKeys();
keyGenTime.Reset();
keyGenTime.Start();
rsa = RSAMain.GenerateKey(SelectedKeySize);
keyGenTime.Stop();
KeyGenTime.Content = keyGenTime.ElapsedMilliseconds.ToString();
var newPublicKey = rsa.PublicKey.FirstOrDefault();
var newPrivateKey = rsa.PrivateKey.FirstOrDefault();
string publicKey = newPublicKey.E;
string privateKey = newPrivateKey.D;
string modulus = newPrivateKey.N;
string Dp = newPrivateKey.Dp;
string Dq = newPrivateKey.Dq;
string Qinv = newPrivateKey.Qinv;
string P = newPrivateKey.P;
string Q = newPrivateKey.Q;
string Ep = newPrivateKey.Dp;
string Eq = newPrivateKey.Dq;
string Id = DateTime.Now.ToString();
RSA2017TestDBContext context = new RSA2017TestDBContext();
var CheckUsername = context.RSA2017TestDB.Where(m => m.Username == Username.Text).FirstOrDefault();
MessageBox.Show("User has been created and keys have been generated for the user.\nClick OK to be redirected to landing page.");
if (CheckUsername == null)
{
var UserKey = context.MyKeys.Add(new MyKeys {
KeyId = Id, D = privateKey, E = publicKey, KeySize = SelectedKeySize, N = modulus, Dp = Dp, Dq = Dq, Ep = Ep, Eq = Eq, P = P, Q = Q, Qinv = Qinv
});
var NewUser = context.RSA2017TestDB.Add(new RSA2017TestDB {
KeyId = Id, Name = Name.Text, PassWord = Password.Password, UserId = Id, Username = Username.Text, MyKeys = UserKey, Email = EmailTxt.Text
});
await context.SaveChangesAsync();
this.NavigationService.Navigate(new RSAIndex(NewUser.UserId));
}
else
{
ErrorMsg.Content = "Username already exist.";
ErrorMsg.Visibility = Visibility.Visible;
}
}
else
{
ErrorMsg.Content = "Password and Confirm Password doesn't match.";
ErrorMsg.Visibility = Visibility.Visible;
}
}
else
{
ErrorMsg.Content = "Enter valid details and try again.";
ErrorMsg.Visibility = Visibility.Visible;
}
}
