/// <summary>
/// Called by the environment to start generating of public/private keys
/// </summary>
public void Execute()
{
BigInteger p = 1, q = 1;
ProgressChanged(0, 1);
switch (settings.Source)
{
// manually enter primes
case 0:
try
{
p = BigIntegerHelper.ParseExpression(settings.P);
q = BigIntegerHelper.ParseExpression(settings.Q);
if (!BigIntegerHelper.IsProbablePrime(p))
{
GuiLogMessage(p.ToString() + " is not prime!", NotificationLevel.Error);
return;
}
if (!BigIntegerHelper.IsProbablePrime(q))
{
GuiLogMessage(q.ToString() + " is not prime!", NotificationLevel.Error);
return;
}
if (p == q)
{
GuiLogMessage("The primes P and Q can not be equal!", NotificationLevel.Error);
return;
}
}
catch (Exception ex)
{
GuiLogMessage("Invalid Big Number input: " + ex.Message, NotificationLevel.Error);
return;
}
break;
//randomly generated primes
case 1:
try
{
int keyBitLength = Convert.ToInt32(settings.KeyBitLength);
if (keyBitLength < 4)
{
GuiLogMessage("The keylength must be greater than 3.", NotificationLevel.Error);
return;
}
int i, maxtries = 10;
for (i = 0; i < maxtries; i++)
{
p = BigIntegerHelper.RandomPrimeMSBSet(keyBitLength - (keyBitLength / 2));
q = BigIntegerHelper.RandomPrimeMSBSet(keyBitLength / 2);
//GuiLogMessage("p = " + p.ToString(), NotificationLevel.Info);
//GuiLogMessage("q = " + q.ToString(), NotificationLevel.Info);
if (p != q)
{
break;
}
}
if (i == maxtries)
{
throw new Exception("Could not create two differing primes");
}
}
catch (Exception ex)
{
GuiLogMessage(ex.Message, NotificationLevel.Error);
return;
}
break;
default:
throw new Exception("Illegal Key Generation Mode");
}
N = p * q;
G = N + 1;
Lambda = (p - 1) * (q - 1);
ProgressChanged(1, 1);
}
