NIS MD5

/* Implementation of MD5 */

#include
#include
#include
#include
#include

unsigned long leftrotate(unsigned long,int);
double myabs(double x);

int main()
{
clrscr();
char tempchar;
int m,h;
char fileName[75];
char message[1000];
FILE *fp;
char ch;
unsigned long temp;
unsigned long w[20];
int n;
unsigned long sineInt[64];
int i;

int r[64]={7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21};
for(i=0;i<64;i++)
{
sineInt[i]=(unsigned long)floor(myabs(sin(i+1)*pow(2,32)));
}
//printf("\nEnter name of the file containing message:");
fp=fopen("c:\\message.txt","r");

i=0;
while(!feof(fp))
{
ch=fgetc(fp);
message[i]=ch;
i++;
}
message[i-1]=0x80;
message[i]='\0';
int no_of_bits=strlen(message)*8;
int message_length=no_of_bits-8;
unsigned long msg_length=message_length;

int bits_to_pad=((512-(no_of_bits%512))+448)%512;

int j=0;
for (j=0;j{
message[i+j]=0x00;
}

message[i+j]='\0';
i=i+j;

unsigned char *ptrchar;
ptrchar= (unsigned char *)(&msg_length);
message[i]=ptrchar[0];
message[i+1]=ptrchar[1];
message[i+2]=ptrchar[2];
message[i+3]=ptrchar[3];
message[i+4]=0x00;
message[i+5]=0x00;
message[i+6]=0x00;
message[i+7]=0x00;

i=i+8;

unsigned long A,B,C,D;

A=0x67452301;
B=0xefcdab89;
C=0x98badcfe;
D=0x10325476;

unsigned long a,b,c,d,f,g;

char message_chunk[70];
int no_of_chunks=(i*8)/512;
int k;
for(j=0;j{
for(k=0;k<64;k++)
{
message_chunk[k]=message[(j*64)+k];
}

for(n=0;n<16;n++)
{
w[n]=*((unsigned long *)(&message_chunk[n*4]));
}


a=A;
b=B;
c=C;
d=D;

for(k=0;k<64;k++)
{
if (k>=0 && k<=15) //round one
{
f=(b & c) | ((~b) & d);
g=k;
}
else if(k>=16 && k<=31) //round two
{
f=(b & d) | (c & (~d));
g=(5*k+1) % 16;
}
else if(k>=32 && k<=47) //round three
{
f=b^c^d;
g=(3*k+5)%16;
}
else if(k>=48 && k<=63) //round four
{
f=c ^ (b | (~d));
g=(7*k)%16;
}
temp=d;
d=c;
c=b;
b=b+leftrotate((a+f+sineInt[k]+w[g]),r[k]);
a=temp;

}
A=A+a;
B=B+b;
C=C+c;
D=D+d;
}

printf("\nThe MD5 hash is:");
ptrchar=(unsigned char *)(&A);
for (h=0;h<4;h++)
printf("%0.2X",ptrchar[h]);
cout<<" ";

ptrchar=(unsigned char *)(&B);
for (h=0;h<4;h++)
printf("%0.2X",ptrchar[h]);
cout<<" ";

ptrchar=(unsigned char *)(&C);
for (h=0;h<4;h++)
printf("%0.2X",ptrchar[h]);
cout<<" ";

ptrchar=(unsigned char *)(&D);
for (h=0;h<4;h++)
printf("%0.2X",ptrchar[h]);

getch();
return 0;
}



//This function circularly left-shifts 'x' by 'c' bits
unsigned long leftrotate(unsigned long x,int c)
{
return ((x<>(32-c)));
}
double myabs(double x)
{
if (x<0)
return -1*x;
else
return x;
}


/*
OUTPUT

Enter name of the file containing message:abc.txt
The message is:The quick brown fox jumps over the lazy dog.
The MD5 hash is:E4D909C2 90D0FB1C A068FFAD DF22CBD0

Enter name of the file containing message:abc.txt
The message is:The quick brown fox jumps over the lazy dog
The MD5 hash is:9E107D9D 372BB682 6BD81D35 42A419D6
*/

NIS RSA Algorithm

#include
#include
#include

void main()
{
clrscr();
unsigned long p,q,n,m,M,e,d,i,C,M1;
cout<<"Enter value of P : ";
cin>>p;
cout<<"Enter value of Q : ";
cin>>q;
n=p*q;
m=(p-1)*(q-1);
for(e=1;e {
if(m%e!=0)
break;
}
d=0;
do
{
d++;
i=(((e*d)-1)%m);
}while(i!=0);
cout<<"e : "< cout<<"d : "< cout<<"Enter value of M : ";
cin>>M;
C=pow(M,e);
C=C%n;
cout<<"Encryption C : "<
M1=pow(C,d);
M1=M1%n;
cout<<"Decryption M1 : "<
getch();
}

NIS Port Scanning

import java.net.*;
import java.io.*;
class Port
{
public static void main(String args[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String host;
int start,end,avail,unavail,i;
Socket sk;
avail=0;
unavail=0;
System.out.println("Enter the host name : ");
host=br.readLine();
System.out.println("Enter the starting port no : ");
start=Integer.parseInt(br.readLine());
System.out.println("Enter the ending port no : ");
end=Integer.parseInt(br.readLine());
for(i=start;i<=end;i++)
{
System.out.print("Port No. " + i);
try
{
sk=new Socket(host,i);
System.out.println(" : Available");
avail++;
}
catch(Exception E)
{
System.out.println(" : Unavailable");
unavail++;
}
}
System.out.println("Total available port : " + avail);
System.out.println("Total unavailable port : " + unavail);
}
}

NIS Host-IP & Vice versa

import java.io.*;
import java.net.*;

class Host
{
public static void main(String args[]) throws UnknownHostException
{
InetAddress in_obj;
String str;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
//get name of local computer & initialise the object
in_obj=InetAddress.getLocalHost();
System.out.println("getLocalHost : " + in_obj);
System.out.println();
//get name of local computer
str=in_obj.getHostName();
System.out.println("getHostName : " + str);
System.out.println();
//get canonical host name [local computer]
str=in_obj.getCanonicalHostName();
System.out.println("getCanonicalHostName : " + str);
System.out.println();
//get Host address [local computer]
str=in_obj.getHostAddress();
System.out.println("getHostAddress : " + str);
System.out.println();
//get remote pc info
in_obj=InetAddress.getByName("localhost");
System.out.println(in_obj);
}
}

NIS One time padding

Code :
#include
#include
#include
void main(int argc,char *argv[])
{
FILE *ip, *key, *op;
unsigned char ic, kc, oc;
clrscr();
if(argc!=4)
{
printf("Not valid parameter list...");
}
else
{
fseek(ip,SEEK_SET,0);
ip=fopen(argv[1],"r");
key=fopen(argv[2],"r");
op=fopen(argv[3],"w");
if( (ip==NULL) || (key==NULL) || (op==NULL) )
{
printf("File opening error...");
}
else
{
fread(&ic, sizeof(unsigned char), 1, ip);
do
{
fread(&kc, sizeof(unsigned char), 1, key);
oc=ic ^ kc;
printf("%c",ic);
fwrite(&oc, sizeof(unsigned char), 1, op);
}while(fread(&ic, sizeof(unsigned char), 1, ip));
}
fclose(op);
fclose(key);
fclose(ip);
}
getch();
}

Key File
QWERTYUIOPASDFGHJKLZXCVBNM

NIS Diffe Helman Program

#include
#include
#include

long double mod (long double q,long n)
{
long double rem=0, quo;
quo=q/n;
quo=floor(quo);
rem=q-(quo*n);
return rem;
}

int check_root(long int q,long int a)
{
long double arr[100];
int i,j,k=0,flag=1;
for(i=1;i {
arr[k]=mod(pow(a,i),q);
k++;
}
for(i=0;i {
for(j=0;j {
if ((i!=j) && (arr[i]==arr[j]))
{
flag=0;
break;
}
}
}
return flag;
}
void main()
{
clrscr();
long q,prem_root=2;
long p_A,k_A,p_B,k_B,pub_A,pub_B;
cout<<"Enter prime no : ";
cin>>q;
do
{
prem_root++;
}while(check_root(q,prem_root));

cout<<"Enter private key of A : ";
cin>>p_A;
pub_A=mod(pow(prem_root,p_A),q);

cout<<"Enter private key of B : ";
cin>>p_B;
pub_B=mod(pow(prem_root,p_B),q);

k_A=mod(pow(pub_B,p_A),q);
k_B=mod(pow(pub_A,p_B),q);

cout<<"Public key A : "< cout<<"Public key B : "< if(k_A==k_B)
{
cout<<"Key exchange successful...";
}
else
{
cout<<"Key exchange unsuccessful...";
}
getch();
}

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