加密和显示图片的PHP代码(可以使用) zhumao

<?
//index.php
session_start();
if($_SESSION["login"] != true)
{
  if(!isset($_SERVER['PHP_AUTH_USER']))
  {
    header('WWW-Authenticate: Basic realm=" ====My Pictures Library===="');
    header('HTTP/1.0 401 Unauthorized');
    echo 'Text to send if user hits Cancel button';
    exit;
  }
  else
  {
    if(md5($_SERVER['PHP_AUTH_USER']) == 'aa7a0f4750f1fd42257f26af921abeee' and md5($_SERVER['PHP_AUTH_PW']) == 'bb39dfc1cb7d9f7d6b3ad7218dfa02f9')
    {
        $_SESSION["login"]=true;
        print "
                <center>
                <form action='loop.php' method='post'>
                <table border=0>
                <tr><td>
                <input type='password' name='mycode' size='20'>
                </td></tr>
                </table>
                <input type='submit' value='Continue...'>
                </form>
                </center>
        ";
    }
  }
}
else
{
  print "What are you doing?!<br>";
  print "Please enter your name and pass,retry!";
  exit;
}
?>
<?
  //show.php
  session_start();
  include "function.php";
  header("Content-type: image/jpeg");
  $filename="./pic/".$_GET["picid"];
  $pass_str=$_SESSION["pass_str"];
  $fp=fopen($filename,"rb");
  $pic1=fread($fp,filesize($filename));
  fclose($fp);
  $pic1=decrypt($pic1,$pass_str);
  $pictrue=hex2bin($pic1);
  echo $pictrue;
?>
<?
//loop.php
session_start();
if(!$_SESSION["login"])
{
  print "<font size=5 color=red>Error!</font>";
  exit;
}
if(isset($_POST["mycode"]))
{
  unset($_SESSION["pass_str"]);
  unset($pass_str);
  $_SESSION["pass_str"]=md5($_POST["mycode"]);
}
include "function.php";
print "
        <center>
        <a href=\"$_SERVER[PHP_SELF]?cmd=upload\">Upload a picture</a>
        <a href=\"$_SERVER[PHP_SELF]?cmd=list\">List all pictures</a>
        <a href=\"$_SERVER[PHP_SELF]?cmd=change\">Change Code</a>
        <a href=\"$_SERVER[PHP_SELF]?cmd=logout\">Logout</a>
        <hr>
        </center>
        ";

$cmd=$_GET["cmd"];
switch($cmd)
{
        case "upload":
                print "
                <center>
                <table border=0>
                <FORM ENCTYPE=\"multipart/form-data\" NAME=MyForm ACTION=$_SERVER[PHP_SELF] METHOD=\"POST\">
                <tr><td>Select one file:</td></tr>
                <tr><td><INPUT NAME=\"MyFile\" TYPE=\"File\"></td></tr>
                <tr><td>
                <input name=\"action\" value=\"upload\" type=\"hidden\">
                <INPUT NAME=\"submit\" VALUE=\"Upload\" TYPE=\"submit\">
                </td></tr>
                </FORM>
                </table>
                </center>
                ";

                break;
        case "list":
                $dir=dir("./pic");
                print "<center><table border=0>";
                while($filed=$dir->read())
                {
                        if($filed != '.' and $filed != '..')
                        {
                                echo "<tr><td><a href='show.php?picid=$filed' target=_blank>$filed</
a></td><td><a href='$_SERVER[PHP_SELF]?picid=$filed&action=delete'>Delete It</a></td></tr>";
                        }
                }
                print "</table></center>";
                $dir->close();
                break;
        case "logout":
                unset($_SESSION["login"]);
                unset($login);
                unset($_SESSION["pass_str"]);
                unset($pass_str);
                session_destroy();
                print "OK! Please close the window!";
                break;
        case "change":
                print "
                <center>
                <form action=$_SERVER[PHP_SELF] method='post'>
                <table border=0>
                <tr><td>
                <input type='password' name='mycode' size='20'>
                <input type='hidden' name='action' value='change'>
                </td></tr>
                </table>
                <input type='submit' value='Continue...'>
                </form>
                </center>
                ";
                break;
}
if($_POST["action"]=="upload")
{
  If($MyFile != "none")
  {
    $pass_str=$_SESSION["pass_str"];
    $fp = fopen($_FILES['MyFile']['tmp_name'],"rb");
    $picture = fread($fp,filesize($_FILES['MyFile']['tmp_name']));
    fclose($fp);
    $picture=bin2hex($picture);
    $pic1=encrypt($picture,$pass_str);
    $newfile="./pic/".strtolower($_FILES['MyFile']['name']);
    $fp = fopen($newfile,"wb");
    fwrite($fp,$pic1);
    fclose($fp);
    unlink($_FILES['MyFile']['tmp_name']);
    print "Upload file:\t" . $_FILES['MyFile']['name'] . "\tSize: ".$_FILES['MyFile']['size'] . "\tbytes, success!";
  }
  else
  {
    echo"Nothing is uploaded!";
  }
}
if($_GET["action"]=="delete")
{
  $filename="./pic/".$_GET["picid"];
  unlink($filename);
  print "Picture\t". $_GET["picid"] ."\thas moved!";
}
?>
<?
#function.php
#这一段代码是别人写的,来源忘了
function keyED($txt,$encrypt_key)
{
$encrypt_key = md5($encrypt_key);
$ctr=0;
$tmp = "";
for ($i=0;$i<strlen($txt);$i++)
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
$ctr++;
}
return $tmp;
}

function encrypt($txt,$key)
{
srand((double)microtime()*1000000);
$encrypt_key = md5(rand(0,32000));
$ctr=0;
$tmp = "";
for ($i=0;$i<strlen($txt);$i++)
{
if ($ctr==strlen($encrypt_key)) $ctr=0;
$tmp.= substr($encrypt_key,$ctr,1) .
(substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
$ctr++;
}
return keyED($tmp,$key);
}

function decrypt($txt,$key)
{
$txt = keyED($txt,$key);
$tmp = "";
for ($i=0;$i<strlen($txt);$i++)
{
$md5 = substr($txt,$i,1);
$i++;
$tmp.= (substr($txt,$i,1) ^ $md5);
}
return $tmp;
}
function _FromHexPair($str,$start = 0)
{
        $c1 = $str[$start];
        $c2 = $str[$start + 1];

        $c1 = ord($c1);
        $c2 = ord($c2);

        $i1;
        $i2;

        if($c1>=ord('0')&& $c1<=ord('9'))
            $i1 =$c1-ord('0');
        else if($c1>=ord('A')&&$c1<=ord('F'))
            $i1 =$c1-ord('A')+10;
        else if($c1>=ord('a')&&$c1<=ord('f'))
            $i1 =$c1-ord('a')+10;
        else throw new exception("unexpected char 1:" . $c1 . " @ " . $start);

        if($c2>=ord('0')&&$c2<=ord('9'))
            $i2 =$c2-ord('0');
        else if($c2>=ord('A')&&$c2<=ord('F'))
            $i2 =$c2-ord('A')+10;
        else if($c2>=ord('a')&&$c2<=ord('f'))
            $i2 =$c2-ord('a')+10;
        else throw new exception("unexpected char 2:" . $c2 . " @ " . ($start+1));

        return chr(($i1<<4) + $i2);
}

function hex2bin($str)
{
        if((strlen($str)%2) != 0 )
            throw new exception("str.Length % 2 != 0");
        $len = strlen($str)/2;
        $str_result = '';

        for($i=0;$i<$len;$i++)
        {
            $str_result .= _FromHexPair($str,$i*2);
        }
        return $str_result;
}
?>