private static void SubSisip(Stego.Mode myMode)
{
if (myMode == Stego.Mode.PCA)
{
Rotasi = "R";
for (int i = 1; i < Pr; i++)
{
Y = Misc.FastExp(G, i, Pr);
if (i - 1 < N)
{
if (isGanjil(Pixel[Y].R + Pixel[Y].G + Pixel[Y].B + Convert.ToInt32(M_1[i - 1].ToString())))
{
Pixel[Y] = newPixel(Pixel[Y]);
}
}
else
{
break;
}
}
}
else if (myMode == Stego.Mode.PCS)
{
Rotasi = "R";
for (int i = 0; i < N; i++)
{
if (isGanjil(Pixel[i].R + Pixel[i].G + Pixel[i].B + Convert.ToInt32(M_1[i].ToString())))
{
Pixel[i] = newPixel(Pixel[i]);
}
}
}
}
private static string SubEkstrak(Stego.Mode myMode, int Start, int Panjang)
{
string res = "";
if (myMode == Stego.Mode.PCA)
{
for (int i = 1 + Start; i <= (Start + Panjang); i++)
{
int Y = Misc.FastExp(G, i, Pr);
if (isGanjil(Pixel[Y].R + Pixel[Y].G + Pixel[Y].B))
{
res += "1";
}
else
{
res += "0";
}
}
}
else if (myMode == Stego.Mode.PCS)
{
for (int i = Start; i < (Start + Panjang); i++)
{
if (isGanjil(Pixel[i].R + Pixel[i].G + Pixel[i].B))
{
res += "1";
}
else
{
res += "0";
}
}
}
return(res);
}
public static bool isBmpCukup(string myPesan, string myKunci, Bitmap myBmp, Stego.Mode myMode, Stego.Enkrip myEnkrip)
{
bool res = false;
M = myPesan;
K = myKunci;
img_ori = myBmp;
nP = img_ori.Width * img_ori.Height;
if (myEnkrip == Stego.Enkrip.AES128)
{
bK = JadiBit(PadChar(K, 16), 8);
eM = AES.Enkrip(PadChar(M, 16), PadChar(K, 16));
}
else if (myEnkrip == Stego.Enkrip.AES256)
{
MessageBox.Show("Maaf Fitur AES256 Belum Ada", "Informasi");
}
else if (myEnkrip == Stego.Enkrip.NoEnkrip)
{
K = ""; bK = ""; eM = M;
}
bM = JadiBit(eM);
inM = Misc.IntToBin(nP).Length;
bnM = Misc.IntToBin(bM.Length).PadLeft(inM, '0');
M_1 = bnM + bK + bM;
N = M_1.Length;
if (myMode == Stego.Mode.PCA)
{
Pr = Misc.GetPrima(nP);
G = Misc.GetGemod(Pr);
if (Pr > N)
{
res = true;
}
else
{
res = false;
}
}
else if (myMode == Stego.Mode.PCS)
{
if (nP > N)
{
res = true;
}
else
{
res = false;
}
}
return(res);
}
public static Bitmap Sisip(string myPesan, string myKunci, Bitmap myBmp, Stego.Mode myMode, Stego.Enkrip myEnkrip)
{
if (isBmpCukup(myPesan, myKunci, myBmp, myMode, myEnkrip))
{
isiPixel();
SubSisip(myMode);
img_hsl = JadiBmp();
}
return(img_hsl);
}
public static bool isKunciSama(Bitmap myBmp, string myKunci, Stego.Mode myMode, Stego.Enkrip myEnkrip)
{
img_ori = myBmp; isiPixel();
nP = img_ori.Width * img_ori.Height;
inM = Misc.IntToBin(nP).Length;
if (myMode == Stego.Mode.PCA)
{
Pr = Misc.GetPrima(nP);
G = Misc.GetGemod(Pr);
}
bnM = SubEkstrak(myMode, 0, inM);
nM = Misc.BinToInt(bnM);
//MessageBox.Show(myEnkrip.ToString(), "Informasi");
if (myEnkrip == Stego.Enkrip.AES128)
{
bK = SubEkstrak(myMode, inM, 128);
K = JadiText(bK).Trim();
}
else if (myEnkrip == Stego.Enkrip.AES256)
{
MessageBox.Show("Maaf Fitur AES256 Belum Ada", "Informasi");
}
else if (myEnkrip == Stego.Enkrip.NoEnkrip)
{
bK = ""; K = "";
}
//MessageBox.Show(K);
if (K == myKunci)
{
return(true);
}
else
{
return(false);
}
}
public static string Ekstrak(Bitmap myBmp, string myKunci, Stego.Mode myMode, Stego.Enkrip myEnkrip)
{
if (isKunciSama(myBmp, myKunci, myMode, myEnkrip))
{
if (myEnkrip == Stego.Enkrip.AES128)
{
bM = SubEkstrak(myMode, (inM + 128), nM);
eM = JadiText(bM);
M = AES.Dekrip(eM, K, 4);
}
else if (myEnkrip == Stego.Enkrip.AES256)
{
M = "Maaf Fitur AES256 Belum Ada";
}
else if (myEnkrip == Stego.Enkrip.NoEnkrip)
{
bM = SubEkstrak(myMode, inM, nM);
eM = JadiText(bM);
M = eM;
}
}
return(M);
}
