bin4

#include<stdio.h>
#include<string.h>

void binary_to_hex(int *bin, int bit_len){
    const char *hex_dig = "0123456789abcdef";
    char hex;
    int i;
    int idx;
    char flag_hex[41] = "4c68e0bef260eabe68e466bea0e460bed866d2dc";
    char hex_your_string[40];
    printf("After doing your hex string:\n");
    for(i=0;i<bit_len;i+=4){

        idx = 8*bin[i] + 4*bin[i+1] + 2*bin[i+2] + bin[i+3];
        hex = hex_dig[idx];
        hex_your_string[i/4] = hex;
        //printf("%d/%d\n",i,bit_len);
        printf("%c",hex);
    }
    printf("\nFlag after xxx and hex:\n"); puts(flag_hex);
    if(strncmp(hex_your_string,flag_hex,40)==0)
        printf("God Job!!\n\n");
    else
        printf("Fail! Try Again!!!\n\n");
}



void converttobinary(char *chr)
{
    int length = strlen(chr);
    int bits[8*length];
    int i;
    int n=0;
    for(i=0; 8*length; i++){
        if(i!=0 && i%8==0)
        {
            n=0;
            ++chr;
            if((*chr)=='\0') break;
        }
        bits[i] = ((1<<n) & (*chr)) != 0 ? 1:0;
        n++;

    }

    int end = (8*length)-1;
    int t;

    for (i = 0; i < (8*length)/2; i++) {
        t       = bits[i];
        bits[i]   = bits[end];
        bits[end] = t;
        end--;
    }


    int temp = bits[0];
    for(i=1;i<(8*length)-1;i++){
        bits[i]=bits[i+1];
    }
    bits[8*length-1] = temp;

    binary_to_hex(bits,8*length);
}

int main(int argc, char** argv){
    char chr[20];
    memset(chr,0,20);
    strncpy(chr,argv[1],20);
    strrev(chr);
    converttobinary(chr);
    return 0;
}