static void Main(string[] args)
{
switch (args[0])
{
case "encrypt":
BigInteger plain = new BigInteger.Parse(args[1]);
BigInteger p = BigInteger.Parse(args[2]);
BigInteger q = BigInteger.Parse(args[3]);
BigInteger e = BigInteger.Parse(args[4]);
BigInteger N = BigInteger.Multiply(p, q);
Console.WriteLine(BigInteger.ModPow(plain, e, N));
break;
case "decrypt":
BigInteger cipher = new BigInteger.Parse(args[1]);
BigInteger p = BigInteger.Parse(args[2]);
BigInteger q = BigInteger.Parse(args[3]);
BigInteger d = BigInteger.Parse(args[4]);
BigInteger phi_N = BigInteger.Multiply(p - 1, q - 1);
Console.WriteLine(BigInteger.ModPow(plain, d, phi_N));
break;
case "findKeyPair":
BigInteger p = BigInteger.Parse(args[1]);
BigInteger q = BigInteger.Parse(args[2]);
BigInteger key = BigInteger(args[3]);
BigInteger N = BigInteger.Multiply(p, q);
Console.WriteLine(ExtendedEuclideanAlgorithm(key, N))
break;
default:
Console.WriteLine('Only valid commands:');
Console.WriteLine('dotnet run encrypt {plaintext in base 10} {prime 1} {prime 2} {key}');
Console.WriteLine('dotnet run decrypt {cipher in base 10} {prime 1} {prime 2} {key}');
Console.WriteLine('dotnet run findKeyPair {prime 1} {prime 2} {key}');
break;
}
}
statistics.Permutations = GetPermutations(
BigInteger.Parse(result.Characters.Length.ToString()),
