des---Copy.rar_DES algorithm

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package des; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintStream; import java.math.BigInteger; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.List; import java.util.*; /** * * @author 12pb08 */ public class working { static PrintStream prnt = System.out; /** * @param args the command line arguments */ public static void main(String[] args) throws IOException { String pt = tobinary("abcdefgh"); String ky = tobinary("abcdefgh"); //String ky="00010011 00110100 01010111 01111001 10011011 10111100 11011111 11110001"; //generate keys char key[][][]=keygen(ky); String ct=encrypt(pt, key); prnt.println("Cipher text in binary :"+ct+" "+ct.length()); // ct=bstringtostring(ct); // prnt.println("cipher text: "+ct); pt=decrypt(ct, key); pt=bstringtostring(pt); prnt.println("plain text: "+pt); } private static String encrypt(String pt,char[][][] key) { //String binary =tobinary(pt); // //intial and inverse intial permutation choice // int [] ip=listgen(64); // int [] inp=invpbox(ip); // //exp/permutation // int [] exp=listgen(48); // //round permutation choice // int [] rndper=listgen(32); // //Sbox // int [][][] sbx=gensbx(8,4,16); constvalues cv=new constvalues(); int [] ip=cv.ip; int [] inp=cv.inp; //exp/permutation int [] exp=cv.exp; //round permutation choice int [] rndper=cv.rndper; //Sbox int [][][] sbx=cv.sbox; //intial permutation pt=permute(ip, pt); String t=pt; for (int i = 1; i <= 16; i++) { prnt.println("Round "+(i)); t=roundfun(t, key[i], exp, sbx, rndper,i,0); prnt.println("Result round "+(i)+": "+t);//+" "+t.length()); prnt.println(); } String ct=permute(inp, t); return ct; } private static String decrypt(String ct,char[][][] key) { // String binary =tobinary(ct); //intial and inverse intial permutation choice // int [] ip=listgen(64); // int [] inp=invpbox(ip); // //exp/permutation // int [] exp=listgen(48); // //round permutation choice // int [] rndper=listgen(32); // //Sbox // int [][][] sbx=gensbx(8,4,16); constvalues cv=new constvalues(); int [] ip=cv.ip; int [] inp=cv.inp; //exp/permutation int [] exp=cv.exp; //round permutation choice int [] rndper=cv.rndper; //Sbox int [][][] sbx=cv.sbox; //intial permutation ct=permute(ip, ct); String t=ct; for (int i = 16; i >0 ; i--) { prnt.println("Round "+(i)); t=roundfun(t, key[i], exp, sbx, rndper,i,1); prnt.println("Result round "+(i)+": "+t);//+" "+t.length()); prnt.println(); } String pt=permute(inp, t); return pt; } private static String roundfun(String binary,char[][] key,int[] exp,int [][][] sbx,int[] rndper,int rnum,int erd) { String rslt=""; //<-round-> String[] sp=splitfun(binary,32); //disp(sp); String[] lit=splitfun(sp[0],4); char [][]li=starrytocharary(lit,8); System.out.print("Li 32-bit: "); disp(li,8,4); String[] ri=splitfun(sp[1],4); System.out.print("Ri 32-bit: "); disp(ri); //char [][] ex=starrytocharary(ri,8); String stri=permute(exp, sp[1]); String[] ex=splitfun(stri,6); char [][]exprslt=starrytocharary(ex,8); // char [][]exprslt=expbox(ri); // System.out.print("expbox 32-bit to 48-bit: "); // disp(exprslt, 8, 6); // exprslt=permute(exp, exprslt, 8, 6); //Xor with constvalues char [][]xr=xorfun(exprslt, key,8,6); System.out.print("xor of key and expbox result 48-bit: "); disp(xr,8,6); //performing sbox String sb=sbox(sbx, xr); System.out.print("Sbox Result 48-bit to 32-bit: "+sb); //32bit Permutation inside round String strpcc=permute(rndper, sb); System.out.print("32-bit Permutation: "+strpcc); String nri=xorfun(sp[0],strpcc); System.out.print("After Xor of ri and permutation result 32-bit: "+nri); if((rnum!=16 && erd==0) || (rnum!=1 && erd==1)) { rslt=sp[1]+nri; } else { rslt=nri+sp[1]; } //<-round-> return rslt; } private static char[][][] keygen(String ky) { //key permutation choices //int []kpc1=cpbxgen(64); //int []kpc2=cpbxgen(56); constvalues cv=new constvalues() ; int []kpc1=cv.kcp1; int []kpc2=cv.kcp2; //parity drop permutation for constvalues ky=permute(kpc1, ky); String[] kyshft=splitfun(ky,28); String ci=kyshft[0]; String di=kyshft[1]; char [][][] key=new char[17][8][6] ; for (int i = 1; i <= 16; i++) { if(i!=1 && i!=2 && i!=9 && i!=16) { ci=shiftleft(ci, 2); di=shiftleft(di, 2); ky=ci+di; } else { ci=shiftleft(ci, 1); di=shiftleft(di, 1); ky=ci+di; } ky=permute(kpc2, ky); String[] kyar=splitfun(ky,6); key[i]=starrytocharary(kyar,8); disp(key[i], 8, 6); } return key; } private static String bstringtostring(String input) { //String input = "011000010110000101100001"; String output = ""; for(int i = 0; i <= input.length() - 8; i+=8) { int k = Integer.parseInt(input.substring(i, i+8), 2); output += (char) k; } //prnt.println(output); return output; } private static char[][] xorfun(char[][] in1,char [][] in2,int r,int c) { char [][]ch=new char[r][c]; for (int i = 0; i < r; i++) { for (int j = 0; j < c; j++) { ch[i][j]=xor(in1[i][j], in2[i][j]); } } return ch; } private static String xorfun(String in1,String in2) { int a= in1.length(); String s=""; for (int i = 0; i < a; i++) { s+=xor(in1.charAt(i), in2.charAt(i)); } return s; } private static char xor(char in1,char in2) { char ou='0'; if ((in1=='0'&&in2=='0')||(in1=='1'&&in2=='1')) { ou='0'; } else if((in1=='0'&&in2=='1')||(in1=='1'&&in2=='0')) { ou='1'; } else { System.out.println("Error "); } return ou; } private static String binstostring(String in) { String r=""; String val = "0110000101100001"; byte[] bval = new