public string decrypt(string CipherTxt, int[,] key)
{
string DecRes = "";
CipherTxt = Utilities.removeSpaces(CipherTxt);
int det = Utilities.calculateDeterm(key, key.GetLength(0));
int temp = key.GetLength(0);
det = ((det % 26) + 26) % 26;
/*if (27 % (26 - det) != 0)
* {
* return "";
* }*/
int[,] InversedMat = CalculateCoFactorMat(key);
InversedMat = Utilities.Transpose(InversedMat);
int b = 26 - (27 / (26 - det));
InversedMat = Utilities.elemWiseMult(b, InversedMat);
for (int i = 0; i < CipherTxt.Length; i += temp)
{
int[,] CiConverted = changeStrToVec(CipherTxt.Substring(i, temp));
int[,] PlainText = Utilities.multiply(InversedMat, CiConverted);
for (int j = 0; j < PlainText.GetLength(0); j++)
{
PlainText[j, 0] = ((PlainText[j, 0] % 26) + 26) % 26;
}
DecRes = string.Concat(DecRes, changeVecToStr(PlainText));
}
return(DecRes);
}
public string encrypt(string PT, int[,] key)
{
PT = Utilities.removeSpaces(PT);
int temp = key.GetLength(0);
string EncRes = "";
for (int i = 0; i < PT.Length; i += temp)
{
int[,] PTconverted = changeStrToVec(PT.Substring(i, temp));
int[,] cipher = Utilities.multiply(key, PTconverted);
for (int j = 0; j < cipher.GetLength(0); j++)
{
cipher[j, 0] = ((cipher[j, 0] % 26) + 26) % 26;
}
EncRes = string.Concat(EncRes, changeVecToStr(cipher));
}
return(EncRes);
}
