// program encrypt.cc
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

char* makesalt( void )
{
  static char salt[10];
  static char saltchar[] = {
    "./0123456789"
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz"
  };

  srand(time(NULL));
 
  for( int i=0; i<8; i++ ){
    salt[i] = saltchar[ (rand()>>6) & 0x3f ];
  }

  return salt;
}

int main( void )
{
  char handle[16];

  fputs("Handle name :", stderr );
  fgets( handle, sizeof(handle), stdin );
  if( 1 != sscanf( handle, "%s", handle ) ){
    fputs("Wrong format.\n", stderr );
    exit(1);
  }

  char* passwd = strdup( getpass("New password:") );

  if( strcmp( passwd, getpass("Again please:") ) ){
    fputs("Miss type! Confirm the password.\n", stderr );
    exit(1);
  }

  printf("%s:%s\n", handle, crypt( passwd, makesalt() ) );

  free(passwd);

  fputs("Succeed.\n", stderr );

  return 0;
}