Write a Program Key generation in Simplified DES in C.

Key generation in Simplified DES in C.

#include<stdio.h>

int main()

{

 int i, count=0, p8[8]={6,7,8,9,1,2,3,4};

 int p10[10]={6,7,8,9,10,1,2,3,4,5};

 

 char input[11], k1[10], k2[10], temp[11];

 char LS1[5], LS2[5];

 printf("Enter 10 Bits Input ::");

 scanf("%s",input); 

 input[10]='\0';

 for(i=0; i<10; i++)

 {

  count = p10[i];

  temp[i] = input[count-1];

 }

 temp[i]='\0';

 printf("\nYour p10 key is ::");

 for(i=0; i<10; i++)

 { printf("%d,",p10[i]); }

 

 printf("\nBits After p10 ::");

 puts(temp);

 for(i=0; i<5; i++)

 {

  if(i==4)

   temp[i]=temp[0];

  else

   temp[i]=temp[i+1];   

 }

 for(i=5; i<10; i++)

 {

  if(i==9)

   temp[i]=temp[5];

  else

   temp[i]=temp[i+1];   

 }

 printf("Output After LS-1 ::");

 puts(temp);

 

 printf("\nYour p8 Key is  ::");

 for(i=0; i<8; i++)

 { printf("%d,",p8[i]); }

 for(i=0; i<8; i++)

 {

  count = p8[i];

  k1[i] = temp[count-1];

 }

 printf("\nYour key k1 is :");

 puts(k1); 

}

OUTPUT

Enter 10 Bits Input :: Computer

Your p10 key is :: 6,7,8,9,10,1,2,3,4,5,

Bits After p10 :: ter

Output After LS-1 :: er

Your p8 Key is  :: 6,7,8,9,1,2,3,4,

Your key k1 is : ompuer