public ChuoiNhiPhan ThucHienDES(ChuoiNhiPhan ChuoiVaoDai, int MaHoaHayGiaiMa)// 1 ma hoa, -1 giai ma
{
KhoaDES.SinhKhoaCon(MaHoaHayGiaiMa);
ChuoiNhiPhan[] DSChuoiVao = ChuoiVaoDai.Chia(ChuoiVaoDai.DoDai / 64);
ChuoiNhiPhan ChuoiVao, ChuoiKQ;
ChuoiKQ = new ChuoiNhiPhan(0);
for (int k = 0; k < DSChuoiVao.Length; k++)
{
ChuoiVao = DSChuoiVao[k];
ChuoiNhiPhan[] ChuoiSauIP;
ChuoiNhiPhan ChuoiSauIP_1;
ChuoiNhiPhan L, R, F, TG;
ChuoiSauIP = CacThongSo.TinhIP(ChuoiVao, MaHoaHayGiaiMa);
L = ChuoiSauIP[0];
R = ChuoiSauIP[1];
for (int i = 0; i < 16; i++)
{
F = HamF(R, KhoaDES.DayKhoaPhu[i]);
L = L.XOR(F);
TG = L;
L = R;
R = TG;
}
ChuoiSauIP_1 = CacThongSo.TinhIP_1(R, L, MaHoaHayGiaiMa);
ChuoiKQ = ChuoiKQ.Cong(ChuoiSauIP_1);
}
return(ChuoiKQ);
}
public static string ChuyenNhiPhanSangChu(ChuoiNhiPhan ChuoiVao)
{
int soChu = ChuoiVao.DoDai / 8;
ChuoiNhiPhan[] MangChuoi = ChuoiVao.Chia(soChu);
string KQ = "";
foreach (var ch in MangChuoi)
{
KQ += (char)ChuoiNhiPhan.ChuyenNhiPhanSangSo(ch);
}
return(KQ);
}
