public override string Decrypt(string text)
{
List<int> numbers = new List<int>();
string[] stringNumbers = text.Split(' ');
foreach (var stringNumber in stringNumbers)
{
numbers.Add(int.Parse(stringNumber));
}
StringBuilder result = new StringBuilder();
foreach (var number in numbers)
{
Mathematics.ModularExponentiation modularExponention = new Mathematics.ModularExponentiation(number, privateKey[0], privateKey[1]);
result.Append(alphabet[modularExponention.RaisedToThePowerModulo()]);
}
return result.ToString();
}
public override string Encrypt(string text)
{
List<int> letterIndexes = new List<int>();
foreach (var letter in text)
{
letterIndexes.Add(alphabet.Letters.IndexOf(letter));
}
generateKeysTest();
StringBuilder resultStringBuilder = new StringBuilder();
foreach (int letterIndex in letterIndexes)
{
Mathematics.ModularExponentiation modularExponention = new Mathematics.ModularExponentiation(letterIndex, PublicKey[0], PublicKey[1]);
resultStringBuilder.Append(modularExponention.RaisedToThePowerModulo() + " ");
}
string result = resultStringBuilder.ToString();
result = result.Substring(0, result.Length - 1);
return result;
}
private string algorithmExample()
{
basis = Mathematics.PrimeNumbers.GetPrime();
moduler = Mathematics.PrimeNumbers.GetPrime();
int a = Mathematics.PrimeNumbers.GetPrime();
Mathematics.ModularExponentiation meA = new Mathematics.ModularExponentiation(basis, a, moduler);
int A = meA.RaisedToThePowerModulo();
int b = Mathematics.PrimeNumbers.GetPrime();
Mathematics.ModularExponentiation meB = new Mathematics.ModularExponentiation(basis, b, moduler);
int B = meB.RaisedToThePowerModulo();
int keyA = Mathematics.ModularExponentiation.RaisedToThePowerModulo(B, a, moduler);
int keyB = Mathematics.ModularExponentiation.RaisedToThePowerModulo(A, b, moduler);
return "1) Generated two prime numbers: p = " + basis.ToString() + ", g = " + moduler.ToString() + "\n" +
"2) Alice choosed number a = " + a.ToString() + " and sent to Bob number A = " + A.ToString() + "\n" +
"3) Bob choosed number b = " + a.ToString() + " and sent to Alice number B = " + B.ToString() + "\n" +
"4) Alice generate her key = " + keyA.ToString() + "\n" +
"5) Bob generate his key = " + keyB.ToString();
}
