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tripleDES decryption.txt
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import java.util.Scanner;
public class Solution {
public static int block64[]=new int[65];
public static int blocka32[]=new int[33];
public static int blockb32[]=new int[33];
public static int blockf32[]=new int[33];
public static int blockt32[]=new int[33];
public static int chiper64[]=new int[65];
public static int chiper56[]=new int[57];
public static int chipera28[]=new int[29];
public static int chiperb28[]=new int[29];
public static int key48[][]=new int[17][49];
public static String intialper[][]={{"58","50","42","34","26","18","10","02"},
{"60","52","44","36","28","20","12","04"},
{"62","54","46","38","30","22","14","06"},
{"64","56","48","40","32","24","16","08"},
{"57","49","41","33","25","17","09","01"},
{"59","51","43","35","27","19","11","03"},
{"61","53","45","37","29","21","13","05"},
{"63","55","47","39","31","23","15","07"}};
public static String parity[][]={{"57","49","41","33","25","17","09","01"},
{"58","50","42","34","26","18","10","02"},
{"59","51","43","35","27","19","11","03"},
{"60","52","44","36","63","55","47","39"},
{"31","23","15","07","62","54","46","38"},
{"30","22","14","06","61","53","45","37"},
{"29","21","13","05","28","20","12","04"}};
public static String finalper[][]={{"40","08","48","16","56","24","64","32"},
{"39","07","47","15","55","23","63","31"},
{"38","06","46","14","54","22","62","30"},
{"37","05","45","13","53","21","61","29"},
{"36","04","44","12","52","20","60","28"},
{"35","03","43","11","51","19","59","27"},
{"34","02","42","10","50","18","58","26"},
{"33","01","41","09","49","17","57","25"}};
public static String comp[][]={{"14","17","11","24","01","05","03","28"},
{"15","06","21","10","23","19","12","04"},
{"26","08","16","07","27","20","13","02"},
{"41","52","31","37","47","55","30","40"},
{"51","45","33","48","44","49","39","56"},
{"34","53","46","42","50","36","29","32"}};
public static String expdbox[][]={{"32","01","02","03","04","05"},
{"04","05","06","07","08","09"},
{"08","09","10","11","12","13"},
{"12","13","14","15","16","17"},
{"16","17","18","19","20","21"},
{"20","21","22","23","24","25"},
{"24","25","26","27","28","29"},
{"28","29","30","31","32","01"}};
public static String fpbox[][]={{"16","07","20","21","29","12","28","17"},
{"01","15","23","26","05","18","31","10"},
{"02","08","24","14","32","27","03","09"},
{"19","13","30","06","22","11","04","25"}};
public static String s[][][]={{{"14","04","13","01","02","15","11","08","03","10","06","12","05","09","00","07"},
{"00","15","07","04","14","02","13","01","10","06","12","11","09","05","03","08"},
{"04","01","14","08","13","06","02","11","15","12","09","07","03","10","05","00"},
{"15","12","08","02","04","9","01","07","05","11","03","14","10","00","06","13"}},
{{"15","01","08","14","06","11","03","04","09","07","02","13","12","00","05","10"},
{"03","13","04","07","15","02","08","14","12","00","01","10","06","09","11","05"},
{"00","14","07","11","10","04","13","01","05","08","12","06","09","03","02","15"},
{"13","08","10","01","03","15","04","02","11","06","07","12","00","05","14","09"}},
{{"10","00","09","14","06","03","15","05","01","13","12","07","11","04","02","08"},
{"13","07","00","09","03","04","06","10","02","08","05","14","12","11","15","01"},
{"13","06","04","09","08","15","03","00","11","01","02","12","05","10","14","07"},
{"01","10","13","00","06","09","08","07","04","15","14","03","11","05","02","12"}},
{{"07","13","14","03","00","06","09","10","01","02","08","05","11","12","04","15"},
{"13","08","11","05","06","15","00","03","04","07","02","12","01","10","14","09"},
{"10","06","09","00","12","11","07","13","15","01","03","14","05","02","08","04"},
{"03","15","00","06","10","01","13","08","09","04","05","11","12","07","02","14"}},
{{"02","12","04","01","07","10","11","06","08","05","03","15","13","00","14","09"},
{"14","11","02","12","04","07","13","01","05","00","15","10","03","09","08","06"},
{"04","02","01","11","10","13","07","08","15","09","12","05","06","03","00","14"},
{"11","08","12","07","01","14","02","13","06","15","00","09","10","04","05","03"}},
{{"12","01","10","15","09","02","06","08","00","13","03","04","14","07","05","11"},
{"10","15","04","02","07","12","09","05","06","01","13","14","00","11","03","08"},
{"09","14","15","05","02","08","12","03","07","00","04","10","01","13","11","06"},
{"04","03","02","12","09","05","15","10","11","14","01","07","06","00","08","13"}},
{{"04","11","02","14","15","00","08","13","03","12","09","07","05","10","06","01"},
{"13","00","11","07","04","09","01","10","14","03","05","12","02","15","08","06"},
{"01","04","11","13","12","03","07","14","10","15","06","08","00","05","09","02"},
{"06","11","13","08","01","04","10","07","09","05","00","15","14","02","03","12"}},
{{"13","02","08","04","06","15","11","01","10","09","03","14","05","00","12","07"},
{"01","15","13","08","10","03","07","04","12","05","06","11","00","14","09","02"},
{"07","11","04","01","09","12","14","02","00","06","10","13","15","03","05","08"},
{"02","01","14","07","04","10","08","13","15","12","09","00","03","05","06","11"}}
};
public static void leftshift(){
int temp=chipera28[1];
for(int i=2;i<=28;i++){
chipera28[i-1]=chipera28[i];
}
chipera28[28]=temp;
temp=chiperb28[1];
for(int i=2;i<=28;i++){
chiperb28[i-1]=chiperb28[i];
}
chiperb28[28]=temp;
}
public static void compresion(int roundkey){
int con=1;
for(int i=0;i<6;i++){
for(int j=0;j<8;j++){
int te;
if(Integer.parseInt(comp[i][j])<=28){
te=chipera28[Integer.parseInt(comp[i][j])];
}
else{
te=chiperb28[Integer.parseInt(comp[i][j])-28];
}
key48[roundkey][con++]=te;
}
}
}
public static void paritydrop(){
int con=1;
for(int i=0;i<7;i++){
for(int j=0;j<8;j++){
chiper56[con++]=chiper64[Integer.parseInt(parity[i][j])];
}
}
}
public static void keygenration(){
paritydrop();
for(int i=1;i<29;i++){
chipera28[i]=chiper56[i];
}
int j=1;
for(int i=29;i<57;i++){
chiperb28[j++]=chiper56[i];
}
for(int i=1;i<=16;i++){
if(i!=1&&i!=2&&i!=9&&i!=16)
leftshift();
leftshift();
compresion(i);
}
}
public static void des_fun(int roundno){
int blockt48[]=new int[49];
//key expansion step
int con=1;
for(int i=0;i<8;i++){
for(int j=0;j<6;j++){
blockt48[con++]=blockb32[Integer.parseInt(expdbox[i][j])];
}
}
//xor of the round key and expansion chiper
for(int i=1;i<=48;i++){
blockt48[i]=blockt48[i]^key48[roundno][i];
}
//work for the sutitution box
int j=1,k=4;
for(int i=0;i<8;i++){
int x,y,a,b,cl,d;
x=blockt48[j++];
a=blockt48[j++];
b=blockt48[j++];
cl=blockt48[j++];
d=blockt48[j++];
y=blockt48[j++];
int r=(x*2)+(y*1);
int c=(a*(2*2*2))+(b*(2*2))+(cl*(2))+(d*1);
int val=Integer.parseInt(s[i][r][c]);
/*if(val>8){
while(val!=0){
int temp=val%2;
blockt32[k--]=temp;
val=val/2;
}
k=k+8;
}*/
//else{
int flag=4;
while(val!=0){
int temp=val%2;
blockt32[k--]=temp;
val=val/2;
flag--;
}
while(flag!=0){
blockt32[k--]=0;
flag--;
}
k=k+8;
//}
//System.out.println(k);
}
//final permutation
int z=1;
for(int i=0;i<4;i++){
for(int m=0;m<8;m++){
blockf32[z++]=blockt32[Integer.parseInt(fpbox[i][m])];
}
}
}
public static void xorit(){
for(int i=1;i<=32;i++){
blocka32[i]=blocka32[i]^blockf32[i];
}
}
public static void swapit(){
int j=1;
for(int i=1;i<=32;i++){
int temp=blocka32[i];
blocka32[i]=blockb32[j];
blockb32[j]=temp;
j++;
}
}
public static void fiit(){
for(int i=1;i<=32;i++)
block64[i]=blocka32[i];
int j=1;
for(int i=33;i<=64;i++)
block64[i]=blockb32[j++];
}
public static void init(){
for(int i=1;i<=32;i++)
blocka32[i]=block64[i];
int j=1;
for(int i=33;i<=64;i++)
blockb32[j++]=block64[i];
}
public static void feistal_chiper(int roundno){
des_fun(roundno);
xorit();
if(roundno!=1)
swapit();
}
public static void intial_per(){
int temp[]=new int[65];
int con=1;
for(int i=0;i<8;i++){
for(int j=0;j<8;j++){
int x=Integer.parseInt(intialper[i][j]);
temp[con]=block64[x];
con++;
}
}
for(int i=1;i<65;i++){
block64[i]=temp[i];
}
}
public static void final_per(){
int temp[]=new int[65];
int con=1;
for(int i=0;i<8;i++){
for(int j=0;j<8;j++){
int x=Integer.parseInt(finalper[i][j]);
temp[con]=block64[x];
con++;
}
}
for(int i=1;i<65;i++){
block64[i]=temp[i];
}
}
public static void setblock(String text){
int k=8,flag=0,con=2;
for(int i=0;i<8;i++){
int x=text.charAt(i);
//System.out.println(x);
while(x>0){
block64[k--]=(x%2);
x=x/2;
flag++;
}
k=con*8;
con++;
}
}
public static void setkey(String text){
int k=8,flag=0,con=2;
for(int i=0;i<8;i++){
int x=text.charAt(i);
while(x>0){
chiper64[k--]=(x%2);
x=x/2;
flag++;
}
k=con*8;
con++;
}
}
public static void getblock(){
for(int i=1;i<65;i=i+8){
int a=block64[i];
int b=block64[i+1];
int c=block64[i+2];
int d=block64[i+3];
int e=block64[i+4];
int f=block64[i+5];
int g=block64[i+6];
int h=block64[i+7];
int val=(a*2*2*2*2*2*2*2)+(b*2*2*2*2*2*2)+(c*2*2*2*2*2)+(d*2*2*2*2)+(e*2*2*2)+(f*2*2)+(g*2)+(h);
System.out.print((char)val);
}
}
public static String checktk(String t){
if(t.length()>=8)
return t;
while(t.length()<8){
t=t+"$";
}
return t;
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
//int i = scan.nextInt();
String text=scan.nextLine();
String key=scan.nextLine();
text=checktk(text);
key=checktk(key);
setblock(text);
setkey(key);
//for demo
/* for(int i=1;i<65;i++){
if(i%2!=0)
block64[i]=1;
}*/
/*System.out.println("the message");
for(int i=1;i<65;i++){
System.out.print(block64[i]);
}*/
System.out.print("\n");
/*for(int i=1;i<57;i++){
if(i%2==0)
chiper56[i]=1;
else
chiper56[i]=0;
}*/
keygenration();
/*System.out.println("the keys");
for(int i=1;i<17;i++){
for(int j=1;j<=48;j++){
System.out.print(key48[i][j]);
}
System.out.print("\n");
}*/
int count=1;
while(count!=3){
intial_per();
/*System.out.println("intial permutaion:-");
for(int i=1;i<65;i++){
System.out.print(block64[i]);
}
System.out.println("\nThe intial two parts of the block");
*/
init();
/* for(int j=1;j<33;j++){
System.out.print(blocka32[j]);
}
System.out.print(" ");
for(int j=1;j<33;j++){
System.out.print(blockb32[j]);
}
System.out.print("\n");
System.out.println("\nThe two parts of the block");*/
for(int i=16;i>=1;i--){
feistal_chiper(i);
/*for(int j=1;j<33;j++){
System.out.print(blocka32[j]);
}
System.out.print(" ");
for(int j=1;j<33;j++){
System.out.print(blockb32[j]);
}
System.out.print("\n");*/
}
fiit();
/*System.out.println("the combination");
for(int i=1;i<65;i++){
System.out.print(block64[i]);
}*/
final_per();
count++;
}
/*System.out.println("\nthe final chipertext");
for(int i=1;i<65;i++){
System.out.print(block64[i]);
}*/
System.out.print("\n");
getblock();
/* Enter your code here. Print output to STDOUT. Your class should be named Solution. */
}
}