SendernReceiver.cpp

#include <iostream>
#include <cstring>
#include <fstream>
#include <algorithm>
#include <vector>
#include "sha512.h"
#include "time.h"
#include <chrono>
#include <sys/time.h>
#include "stdlib.h"
#include <string>
#include <bitset>

using std::string;
using std::cout;
using std::cin;
using std::endl;
using namespace std;
using namespace std::chrono;

const unsigned long long SHA512::sha512_k[80] = //ULL = uint64
            {0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
             0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
             0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
             0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
             0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
             0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
             0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
             0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
             0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
             0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
             0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
             0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
             0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
             0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
             0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
             0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
             0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
             0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
             0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
             0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
             0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
             0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
             0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
             0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
             0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
             0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
             0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
             0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
             0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
             0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
             0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
             0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
             0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
             0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
             0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
             0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
             0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
             0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
             0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
             0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL};

void SHA512::transform(const unsigned char *message, unsigned int block_nb)
{
    uint64 w[80];
    uint64 wv[8];
    uint64 t1, t2;
    const unsigned char *sub_block;
    int i, j;
    for (i = 0; i < (int) block_nb; i++) {
        sub_block = message + (i << 7);
        for (j = 0; j < 16; j++) {
            SHA2_PACK64(&sub_block[j << 3], &w[j]);
        }
        for (j = 16; j < 80; j++) {
            w[j] =  SHA512_F4(w[j -  2]) + w[j -  7] + SHA512_F3(w[j - 15]) + w[j - 16];
        }
        for (j = 0; j < 8; j++) {
            wv[j] = m_h[j];
        }
        for (j = 0; j < 80; j++) {
            t1 = wv[7] + SHA512_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
                + sha512_k[j] + w[j];
            t2 = SHA512_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
            wv[7] = wv[6];
            wv[6] = wv[5];
            wv[5] = wv[4];
            wv[4] = wv[3] + t1;
            wv[3] = wv[2];
            wv[2] = wv[1];
            wv[1] = wv[0];
            wv[0] = t1 + t2;
        }
        for (j = 0; j < 8; j++) {
            m_h[j] += wv[j];
        }

    }
}

void SHA512::init()
{
    m_h[0] = 0x6a09e667f3bcc908ULL;
    m_h[1] = 0xbb67ae8584caa73bULL;
    m_h[2] = 0x3c6ef372fe94f82bULL;
    m_h[3] = 0xa54ff53a5f1d36f1ULL;
    m_h[4] = 0x510e527fade682d1ULL;
    m_h[5] = 0x9b05688c2b3e6c1fULL;
    m_h[6] = 0x1f83d9abfb41bd6bULL;
    m_h[7] = 0x5be0cd19137e2179ULL;
    m_len = 0;
    m_tot_len = 0;
}

void SHA512::update(const unsigned char *message, unsigned int len)
{
    unsigned int block_nb;
    unsigned int new_len, rem_len, tmp_len;
    const unsigned char *shifted_message;
    tmp_len = SHA384_512_BLOCK_SIZE - m_len;
    rem_len = len < tmp_len ? len : tmp_len;
    memcpy(&m_block[m_len], message, rem_len);
    if (m_len + len < SHA384_512_BLOCK_SIZE) {
        m_len += len;
        return;
    }
    new_len = len - rem_len;
    block_nb = new_len / SHA384_512_BLOCK_SIZE;
    shifted_message = message + rem_len;
    transform(m_block, 1);
    transform(shifted_message, block_nb);
    rem_len = new_len % SHA384_512_BLOCK_SIZE;
    memcpy(m_block, &shifted_message[block_nb << 7], rem_len);
    m_len = rem_len;
    m_tot_len += (block_nb + 1) << 7;
}

void SHA512::final(unsigned char *digest)
{
    unsigned int block_nb;
    unsigned int pm_len;
    unsigned int len_b;
    int i;
    block_nb = 1 + ((SHA384_512_BLOCK_SIZE - 17)
                     < (m_len % SHA384_512_BLOCK_SIZE));
    len_b = (m_tot_len + m_len) << 3;
    pm_len = block_nb << 7;
    memset(m_block + m_len, 0, pm_len - m_len);
    m_block[m_len] = 0x80;
    SHA2_UNPACK32(len_b, m_block + pm_len - 4);
    transform(m_block, block_nb);
    for (i = 0 ; i < 8; i++) {
        SHA2_UNPACK64(m_h[i], &digest[i << 3]);
    }
}

std::string sha512(std::string input)
{
    unsigned char digest[SHA512::DIGEST_SIZE];
    memset(digest,0,SHA512::DIGEST_SIZE);
    SHA512 ctx = SHA512();
    ctx.init();
    ctx.update((unsigned char*)input.c_str(), input.length());
    ctx.final(digest);

    char buf[2*SHA512::DIGEST_SIZE+1];
    buf[2*SHA512::DIGEST_SIZE] = 0;
    for (int i = 0; i < SHA512::DIGEST_SIZE; i++)
        sprintf(buf+i*2, "%02x", digest[i]);
    return std::string(buf);
}

std::string hexToBin(string hexdec)
{
    string ans;
    long int i = 0;

    while (hexdec[i]) {

        switch (hexdec[i]) {
        case '0':
            ans+="0000";
            break;
        case '1':
            ans+="0001";
            break;
        case '2':
            ans+="0010";
            break;
        case '3':
            ans+="0011";
            break;
        case '4':
            ans+="0100";
            break;
        case '5':
            ans+="0101";
            break;
        case '6':
            ans+="0110";
            break;
        case '7':
            ans+="0111";
            break;
        case '8':
            ans+="1000";
            break;
        case '9':
            ans+="1001";
            break;
        case 'A':
        case 'a':
            ans+="1010";
            break;
        case 'B':
        case 'b':
            ans+="1011";
            break;
        case 'C':
        case 'c':
            ans+="1100";
            break;
        case 'D':
        case 'd':
            ans+="1101";
            break;
        case 'E':
        case 'e':
            ans+="1110";
            break;
        case 'F':
        case 'f':
            ans+="1111";
            break;
        default:
            cout << "\nInvalid hexadecimal digit "
                 << hexdec[i];
        }
        i++;
    }
    return ans;
}

int main()
{
    struct timespec start, end;
    time_t myTime = time(NULL);
    string sub1,sub2;
    int cc=0, NS_cc =0;
    bool Uf = 0;
  L:string Ts = ctime(&myTime);
    clock_gettime(CLOCK_MONOTONIC, &start);
    srand(time(NULL));
    long int rn=rand()%(2^64);
    string random = std::bitset<64>(rn).to_string();
    string CRn = std::bitset<8>(cc).to_string()+std::bitset<8>(NS_cc).to_string()+Ts+random;
    string output1 = sha512(CRn);
    output1 = hexToBin(output1);
    sub1 = output1.substr(0,256);
    sub2 = output1.substr(257,512);
    string IID = sub1.substr(0,25)+sub2.substr(0,25)+random.substr(0,14);
    string lla = "1111111010000000000000000000000000000000000000000000000000000000"+IID;
    string output2 = sha512(IID);
    output2 = hexToBin(output2);
    string TPIID = output2.substr(0,40)+lla.substr(104,127);
    string T_IP = "1111111010000000000000000000000000000000000000000000000000000000"+TPIID;
    ios_base::sync_with_stdio(false);
    clock_gettime(CLOCK_MONOTONIC, &end);
    cout<<T_IP<<"    "<< T_IP.length()<<endl;
    double time_taken;
    time_taken = (end.tv_sec - start.tv_sec) * 1e9;
    time_taken = (time_taken + (end.tv_nsec - start.tv_nsec)) * 1e-9;
    cout << "Time taken for address generation is : " << fixed
         << time_taken;
    cout << " sec" << endl;
    cout << "Generated LLA is: "<<lla<<"    "<<lla.length()<<endl;
    bool NA_Flag, NS_Flag;
    while(1)
    {
           cout<<"Is NA received?.. Yes-1, No-0: ";
           cin>>NA_Flag;
           string R_LL;
           if(NA_Flag)
           {
               cout<<"Enter received link-local address: ";
               cin>>R_LL;
               if(R_LL==lla)
               {
                   ++cc;
                   if(cc==5){
                    cout<<"Malicious activity detected!! Retaining the generated address."<<endl;
                    Uf=1;
                    break;
                   }
                   else
                    goto L;
               }
               else{
                Uf=1;
                cout<<"Generated LLA is unique."<<endl;
                break;
               }
           }
           else{
            Uf=1;
            cout<<"No NA received."<<endl;
            cout<<"Generated LLA is unique."<<endl;
            break;
           }
    }
    while(1)
    {
           cout<<"Is NS received?.. Yes-1, No-0: ";
           cin>>NS_Flag;
           if(NS_Flag)
           {
                   ++NS_cc;
                   if(NS_cc==5){
                    cout<<"Malicious activity detected!! Retaining the generated address."<<endl;
                    Uf=1;
                    break;
                   }
                   else
                    goto L;
           }
           else{
            cout<<"No NS received.";
            Uf=1;
            break;
           }
    }
    cout<<"Do you want to run the receiver code?...Yes-1, No-0: ";
    bool re;
    cin>>re;
    if(re){
        string RTIP, Rtiid;
        cout<<"Enter the target IP address field in the Received ICMP header of Neighbor Solicitation: ";
        cin>>RTIP;
        Rtiid=RTIP.substr(65,128);
        if(TPIID==Rtiid)
            cout<<"Address matched!! Sending neighbour advertisement...";
        else
            cout<<"Address not matched. Discarding neighbour solicitation...";
    }
    return 0;
}