/*
   ccproxy decryption key
   author : novatech
   usage : ./cprd or cprd.exe <encrypted key>
*/
#include <stdio.h>
#include <string.h>
#define invalid printf("error => invalid key format, please re-check"); return 1

int main(int argc,unsigned char* argv[])
    {
    if (!argv[1]) { invalid; }
    int Dkey,i,g = 0,intv,result = 0,x = strlen(argv[1]),Ekey[x/3];
    
    if (x%3 != 0) { invalid; }
       
    for (i = 0; i < x; i++)
        {
        intv = argv[1][i] - '0';
        result = result*10+intv;            
        if ((i+1)%3 == 0)
           {
           if (result >= 744 && result <= 999 )
              {
              Ekey[g] = result; g++; intv,result = 0;
              }
        else { invalid; }
             }
        }
    printf("encrypted key => %s\nencryption length => %d\nreal length => %d\n",argv[1],x,x/3);
    printf("decrypted key => ");
    for (i = 0; i < x/3;i++)
        {
        Dkey = 255+(744-Ekey[i]);
        printf("%c",Dkey);
        }
    
    return 0;
}
#compiled with dev c++ 4.9.9.2