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

/*
 * Keygen for LuCiFeR's First C++ Crackme
 * http://crackmes.de/users/lucifer/first_c_crackme/
 *
 * Copyright 2008 Lee Hinman <lee [0x40] writequit.org>
 */

int
get_key(int namelen) {

  int foo = 0;
  __asm__ __volatile__("mov  %%eax, %%edx;"
                       "imul $0x875cd, %%edx;"
                       "mov  $0x51eb851f, %%eax;"
                       "mul  %%edx;"
                       "mov  %%edx, %%eax;"
                       "shr  $5, %%eax;"
                       "imul $0xfffffc90, %%eax;"
                       "mov  $0, %%edx;"
                       "push %%edx;"
                       "push %%eax;"
                       "fildll %%ss:(%%esp);"
                       "fstpl 0x8(%%esp);"
                       "mov  0x8(%%esp), %%eax;"
                       :"=a"(foo)
                       :"a"(namelen));
  return foo;
}

int
main(int argc, char** argv) {
  if (argc < 2)
  {
    printf("./keygen <name>");
    return 0;
  }

  int key;

  key = get_key(strlen(argv[1]));

  printf("key: %i-x019871\n",key);
  return 0;
}