private string pBoxing(string input, tableCollection tc)
{
int[] before = new int[input.Length];
int[] result = new int[input.Length];
char[] ch = input.ToCharArray(); // string to chararray
for (int i = 0; i < input.Length; i++)
{
before[i] = int.Parse(ch[i].ToString()); // chararray to intarray
}
for (int j = 0; j < input.Length; j++)
{
int flag = tc.pbox64[j];
result[flag] = before[j];
}
StringBuilder sb = new StringBuilder();
for (int k = 0; k < result.Length; k++)
{
sb.Append(result[k].ToString());
}
return(sb.ToString());
}
private string expBoxing(string input, tableCollection tc)
{
/* change input 32bit into 48 bit message to be used for FEISTEL round
*
* */
int[] before = new int[input.Length];
int[] result = new int[48];
char[] ch = input.ToCharArray(); // string to chararray
for (int i = 0; i < input.Length; i++)
{
before[i] = int.Parse(ch[i].ToString()); // chararray to intarray
}
for (int j = 0; j < result.Length; j++)
{
int flag = tc.exPbox[j];
result[j] = before[flag];
}
StringBuilder sb = new StringBuilder();
for (int k = 0; k < result.Length; k++)
{
sb.Append(result[k].ToString());// 1111111->011111111
}
return(sb.ToString());
}
public ticketGrantingServerPage(Form1 mf, Client p1, tableCollection tc, securityCollection sc, tgsServer tgs, authServer asp, rsaServiceServer rss, mainForm mPage)
{
InitializeComponent();
this.f = mf;
this.p = p1;
this.tabCol = tc;
this.secCol = sc;
this.tgServer = tgs;
this.aServer = asp;
this.sServer = rss;
this.mainPage = mPage;
}
public authServerPage(Form1 mf, Client p1, tableCollection tc, securityCollection sc, tgsServer tgs, authServer asp, mainForm mPage)
{
InitializeComponent();
this.f = mf;
this.p = p1;
this.tabCol = tc;
this.secCol = sc;
this.tgServer = tgs;
this.aServer = asp;
this.mainPage = mPage;
comboBox1.SelectedIndex = 0;
}
private string secondPC2(string key, tableCollection tc)
{
char[] binKey = new char[key.Length];
char[] ch = new char[48];
key = getBit(key); // 64bit key
binKey = key.ToCharArray(); //64bit key array
for (int i = 0; i < 48; i++)
{
int flag = tc.pc2[i];
ch[i] = binKey[flag];
}
StringBuilder sb = new StringBuilder();
for (int k = 0; k < ch.Length; k++)
{
sb.Append(ch[k].ToString());
}
return(sb.ToString());
}
private string sBoxing(string input, tableCollection tc)
{
int flag = 0;
char[,] splittedBit = new char[8, 6];
int[,] sBoxedBit = new int[8, 4];
string pre;
string content;
string[] smallChunk = new string[8];
string message = null;
for (int k = 0; k < 8; k++)
{
for (int j = 0; j < 6; j++)
{
splittedBit[k, j] = input[flag];
flag++;
}
}
for (int k = 0; k < 8; k++)
{
for (int i = 0; i < 4; i++)
{
pre = splittedBit[k, 0].ToString() + splittedBit[k, 5].ToString();
content = splittedBit[k, 1].ToString() + splittedBit[k, 2].ToString() + splittedBit[k, 3].ToString() + splittedBit[k, 4].ToString();
sBoxedBit[k, i] = tc.sbox[k, Convert.ToInt64(pre, 2), Convert.ToInt64(content, 2)];
smallChunk[k] = Convert.ToString(sBoxedBit[k, i], 2).PadLeft(4, '0');
}
}
for (int i = 0; i < 8; i++)
{
message += smallChunk[i];
}
return(message);
}
public string feistel(string rightMessage, int i, tableCollection tc, string [] subKey)
{
//input is 32bit right message and key order number
/*1. EXP the 32bit to the 48bit v
* 2. XOR 48bit message and key[i] v
* 3. split to 6bit 8 strings
* 4. sboxing 6bit to 4bit
* 5. integrate the 4bit 88 strings
* 6. 32bit pboxing
* 7. return
* */
string message;
message = expBoxing(rightMessage, tc);
message = xor(message, subKey[i]);
message = sBoxing(message, tc);
message = pBoxing32(message, tc);
return(message);
}
public void generateKey(string key, tableCollection tc, string[] subKey)
{
//1. get key 64bit
//2. pc1
//3. left shift
//4. combine
//5. pc2
//6. store in subkey array
char[] left = new char[28];
char[] right = new char[28];
char[] binKey = new char[key.Length]; // 64bit key to array
string firstPCed; // 56bit key
string secondPCed;
string leftSt;
string rightSt;
key = getBit(key); // 64bit key
binKey = key.ToCharArray(); //64bit key array
firstPCed = firstPC1(key, tc);
for (int i = 0; i < left.Length; i++)
{
left[i] = binKey[i];
}
StringBuilder sb = new StringBuilder();
for (int k = 0; k < left.Length; k++)
{
sb.Append(left[k].ToString());
}
leftSt = sb.ToString();
for (int i = 0; i < right.Length; i++)
{
right[i] = binKey[right.Length + i];
}
StringBuilder sb1 = new StringBuilder();
for (int k = 0; k < right.Length; k++)
{
sb1.Append(right[k].ToString());
}
rightSt = sb1.ToString();
for (int i = 0; i < 16; i++)// Subkey 0,1,8,15 will have one left shift, the others will have two time left shift
{
if (i == 0 || i == 1 || i == 8 || i == 15)
{
leftSt = shift(leftSt);
rightSt = shift(rightSt);
firstPCed = leftSt + rightSt;
secondPCed = secondPC2(firstPCed, tc);
subKey[i] = secondPCed;
}
else
{
leftSt = shift(leftSt);
leftSt = shift(leftSt);
rightSt = shift(rightSt);
rightSt = shift(rightSt);
firstPCed = leftSt + rightSt;
secondPCed = secondPC2(firstPCed, tc);
subKey[i] = secondPCed;
}
}
}
public string decryption(string input, tableCollection tc, string key, Form1 f)
{
string leftSt;
string rightSt;
string tempRight;
char[] left = new char[32];
char[] right = new char[32];
char[] binMessage = new char[64];
string[] subKey = new string[16];
string[] messagePart;
string ciphertext = null;
int q = input.Length / 64, r = input.Length % 64;
if (q == 0)
{
messagePart = new string[1];
}
else
{
if (r == 0)
{
messagePart = new string[q];
}
else
{
messagePart = new string[q + 1];
}
}
setMessagChunk(messagePart, q, r, input);
generateKey(key, tc, subKey);
printSubKey(subKey, f);
for (int j = 0; j < messagePart.Length; j++)
{
f.printProcess("\nBlock " + (j + 1), Color.Navy);
StringBuilder sb = new StringBuilder();
StringBuilder sb1 = new StringBuilder();
string iped = pBoxing(messagePart[j], tc);
binMessage = iped.ToCharArray();
for (int i = 0; i < left.Length; i++)
{
left[i] = binMessage[i];
}
for (int k = 0; k < left.Length; k++)
{
sb.Append(left[k].ToString());
}
leftSt = sb.ToString();
for (int i = 0; i < right.Length; i++)
{
right[i] = binMessage[32 + i];
}
for (int k = 0; k < right.Length; k++)
{
sb1.Append(right[k].ToString());
}
rightSt = sb1.ToString();
for (int i = 0; i < 16; i++)
{
tempRight = rightSt;
rightSt = feistel(rightSt, 15 - i, tc, subKey); // Feistel round, using subkey 16->1(reverse order of encryption)
leftSt = xor(leftSt, rightSt);
rightSt = leftSt;
leftSt = tempRight;
printRound(leftSt, rightSt, i, f);//Print left and right per round from 1~16
}
iped = rightSt + leftSt;
iped = ipBoxing(iped, tc);
if (j == messagePart.Length - 1)
{
iped = iped.TrimStart(new Char[] { '0' });
iped.PadLeft(iped.Length + 1, '0');
int remainder = iped.Length % 8;
for (int i = 0; i < 8 - remainder; i++)
{
iped = "0" + iped;
}
ciphertext += iped;
}
else
{
ciphertext += iped;
}
}
f.printProcess("\nDecryption Result : " + ciphertext, Color.Olive);
return(ciphertext);
}
public string encryption(string input, tableCollection tc, string key, Form1 f)
{
/* 1. Get plaintext
* 2. divide message with 64(Because blocks should be 64bit)
* 3. get quotient and remainder
* 4. if the remainder is 0 the message size will be quotient
* 5. if the remainder is not 0
* 6. the message size will be quotient + 1, and the last block will be padded with zero as much total 64 bit
* 7. if the remainder is 0
* 8. for loop encryption as much quotient times.
* 9. and append all the message chunks.
* 10. if the remainder is not zero
* 9. make last chunk as 64 bit size, padding left with 0s.
* 10.for loop encryption as much quotient -1 times.
* 11. append all the messages
* */
string[] messagePart;
string ciphertext = null;
int q = input.Length / 64, r = input.Length % 64; // Get message block size and remainder of the last block
if (q == 0)
{
messagePart = new string[1];
}
else
{
if (r == 0)
{
messagePart = new string[q];
}
else
{
messagePart = new string[q + 1];
}
}
setMessagChunk(messagePart, q, r, input); // Divide message into 64bit blocks
string[] subKey = new string[16];
string leftSt;
string rightSt;
string tempRight;
char[] left = new char[32];
char[] right = new char[32];
char[] binMessage = new char[64];
generateKey(key, tc, subKey); // Generate gubkeys for feistel rounds
printSubKey(subKey, f);
for (int j = 0; j < messagePart.Length; j++)
{
f.printProcess("\nBlock " + (j + 1), Color.Navy);
StringBuilder sb = new StringBuilder();
StringBuilder sb1 = new StringBuilder();
string iped = pBoxing(messagePart[j], tc);
binMessage = iped.ToCharArray();
for (int i = 0; i < left.Length; i++) // Generate Left half of the message
{
left[i] = binMessage[i];
}
for (int k = 0; k < left.Length; k++)
{
sb.Append(left[k].ToString());
}
leftSt = sb.ToString();
for (int i = 0; i < right.Length; i++)//Generate Right half of the message
{
right[i] = binMessage[32 + i];
}
for (int k = 0; k < right.Length; k++)
{
sb1.Append(right[k].ToString());
}
rightSt = sb1.ToString();
for (int i = 0; i < 16; i++)
{
tempRight = rightSt;
rightSt = feistel(rightSt, i, tc, subKey); // Feistel round, using subkey 1->16
leftSt = xor(leftSt, rightSt);
rightSt = leftSt;
leftSt = tempRight;
printRound(leftSt, rightSt, i, f);//Print left and right per round from 1~16
}
iped = rightSt + leftSt;
iped = ipBoxing(iped, tc);
ciphertext += iped;
}
f.printProcess("\nEncryption Result : " + ciphertext, Color.Olive);
return(ciphertext);
}