public static string MaHoaTinyDES(char charcanmahoa, string khoanhapvao)
{
char kitucanmahoa = charcanmahoa;
int sodecima = Convert.ToInt32(charcanmahoa);
string chuoinhiphan = Convert.ToString(sodecima, 2);
chuoinhiphan = ChuyenThanhDecima8KiTu(chuoinhiphan);
string khoa = khoanhapvao;
string KL0 = khoa.Substring(0, 4);
string KR0 = khoa.Substring(4);
string L0 = chuoinhiphan.Substring(0, 4);
string R0 = chuoinhiphan.Substring(4);
string C = "";
//Vòng 1
for (int i = 1; i <= 3; i++)
{
string L1 = R0;
string expandR0 = GiaiThuatTinyDES.Expand(R0);
string KL1;
string KR1;
if (i == 2)
{
KL1 = GiaiThuatTinyDES.DichVong(KL0, 2);
KR1 = GiaiThuatTinyDES.DichVong(KR0, 2);
}
else
{
KL1 = GiaiThuatTinyDES.DichVong(KL0, 1);
KR1 = GiaiThuatTinyDES.DichVong(KR0, 1);
}
string K1 = GiaiThuatTinyDES.Compress(KL1, KR1);
string expandR0xorK1 = GiaiThuatTinyDES.Xor2Chuoi(expandR0, K1);
string sbox = GiaiThuatTinyDES.Sbox(expandR0xorK1);
string F1 = GiaiThuatTinyDES.Pbox(sbox);
string R1 = GiaiThuatTinyDES.Xor2Chuoi(L0, F1);
L0 = L1;
R0 = R1;
KL0 = KL1;
KR0 = KR1;
C = L1 + R1;
}
int soketqua = Convert.ToInt32(C, 2);
char kituketqua = Convert.ToChar(soketqua);
return(kituketqua.ToString());
}
public static string GiaiMaTinyDES(char charcangiaima, string khoanhapvao)
{
char kitucangiama = charcangiaima;
int sodecima = Convert.ToInt32(kitucangiama);
string chuoinhiphan = Convert.ToString(sodecima, 2);
chuoinhiphan = ChuyenThanhDecima8KiTu(chuoinhiphan);
string L3 = chuoinhiphan.Substring(0, 4);
string R3 = chuoinhiphan.Substring(4);
string khoa = khoanhapvao;
string KL3 = khoa.Substring(0, 4);
string KR3 = khoa.Substring(4);
string P = "";
//Giải mã
for (int i = 1; i <= 3; i++)
{
string R2 = L3;
string KL2, KR2;
string expandR2 = GiaiThuatTinyDES.Expand(R2);
if (i == 2)
{
KL2 = GiaiThuatTinyDES.DichVongTruoc(KL3, 2);
KR2 = GiaiThuatTinyDES.DichVongTruoc(KR3, 2);
}
else
{
KL2 = GiaiThuatTinyDES.DichVongTruoc(KL3, 1);
KR2 = GiaiThuatTinyDES.DichVongTruoc(KR3, 1);
}
string K3 = GiaiThuatTinyDES.Compress(KL3, KR3);
string xorexpandR2K3 = GiaiThuatTinyDES.Xor2Chuoi(expandR2, K3);
string sbox = GiaiThuatTinyDES.Sbox(xorexpandR2K3);
string F3 = GiaiThuatTinyDES.Pbox(sbox);
string L2 = GiaiThuatTinyDES.Xor2Chuoi(R3, F3);
P = L2 + R2;
L3 = L2;
R3 = R2;
KL3 = KL2;
KR3 = KR2;
}
int soketquagiaima = Convert.ToInt32(P, 2);
char kituketqua = Convert.ToChar(soketquagiaima);
return(kituketqua.ToString());
}
public string GiaiMaTinyDES(string ma, string banma)
{
try
{
string khoa = ma;
char[] cackitumuonmahoa = banma.ToCharArray();
string chuoiketqua = "";
foreach (char s in cackitumuonmahoa)
{
chuoiketqua = chuoiketqua + GiaiThuatTinyDES.GiaiMaTinyDES2(s, khoa);
}
return(chuoiketqua);
}
catch
{
return("Có lỗi xảy ra rồi.");
}
}
public static string GiaiMaTinyDesTest(string chuoinhiphan, string khoanhapvao)
{
string khoa = khoanhapvao;
string L3 = chuoinhiphan.Substring(0, 4);
string R3 = chuoinhiphan.Substring(4);
string KL3 = khoa.Substring(0, 4);
string KR3 = khoa.Substring(4);
string P = "";
//Giải mã
for (int i = 1; i <= 3; i++)
{
string R2 = L3;
string KL2, KR2;
string expandR2 = GiaiThuatTinyDES.Expand(R2);
if (i == 2)
{
KL2 = GiaiThuatTinyDES.DichVongTruoc(KL3, 2);
KR2 = GiaiThuatTinyDES.DichVongTruoc(KR3, 2);
}
else
{
KL2 = GiaiThuatTinyDES.DichVongTruoc(KL3, 1);
KR2 = GiaiThuatTinyDES.DichVongTruoc(KR3, 1);
}
string K3 = GiaiThuatTinyDES.Compress(KL3, KR3);
string xorexpandR2K3 = GiaiThuatTinyDES.Xor2Chuoi(expandR2, K3);
string sbox = GiaiThuatTinyDES.Sbox(xorexpandR2K3);
string F3 = GiaiThuatTinyDES.Pbox(sbox);
string L2 = GiaiThuatTinyDES.Xor2Chuoi(R3, F3);
P = L2 + R2;
L3 = L2;
R3 = R2;
KL3 = KL2;
KR3 = KR2;
}
return(P);
}
public static string MaHoaTinyDESTest(string chuoinhiphan, string khoanhapvao)
{
string khoa = khoanhapvao;
string KL0 = khoa.Substring(0, 4);
string KR0 = khoa.Substring(4);
string L0 = chuoinhiphan.Substring(0, 4);
string R0 = chuoinhiphan.Substring(4);
string C = "";
for (int i = 1; i <= 3; i++)
{
string L1 = R0;
string expandR0 = GiaiThuatTinyDES.Expand(R0);
string KL1;
string KR1;
if (i == 2)
{
KL1 = GiaiThuatTinyDES.DichVong(KL0, 2);
KR1 = GiaiThuatTinyDES.DichVong(KR0, 2);
}
else
{
KL1 = GiaiThuatTinyDES.DichVong(KL0, 1);
KR1 = GiaiThuatTinyDES.DichVong(KR0, 1);
}
string K1 = GiaiThuatTinyDES.Compress(KL1, KR1);
string expandR0xorK1 = GiaiThuatTinyDES.Xor2Chuoi(expandR0, K1);
string sbox = GiaiThuatTinyDES.Sbox(expandR0xorK1);
string F1 = GiaiThuatTinyDES.Pbox(sbox);
string R1 = GiaiThuatTinyDES.Xor2Chuoi(L0, F1);
L0 = L1;
R0 = R1;
KL0 = KL1;
KR0 = KR1;
C = L1 + R1;
}
return(C);
}
