encrypt file in php

can anybody help me with encryption file..such as .avi .jpeg .mp3....
i know what to do..first i must convert those file to binary i think.can anybody suggest me an idea.

Well, you could just read the contents and then encrypt them, then write them to the file.

PHP Code:

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$file = 'path/to/file.txt';
$contents = file_get_contents($file);
if($contents){
  // encrypt the $contents and write it to a file.
} 


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Quote:

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Originally Posted by PeejAvery

Well, you could just read the contents and then encrypt them, then write them to the file.

PHP Code:

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$file = 'path/to/file.txt';
$contents = file_get_contents($file);
if($contents){
  // encrypt the $contents and write it to a file.
} 


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well..actually i am pretty lost right now.can you give me a little bit of a direction..if i do something like below.i got an error.can i give a key to the encryption so that i can decrypt it back.

Warning: fopen(away-enlarge.jpg) [function.fopen]: failed to open stream: No such file or directory in D:\web\tesis\3.php on line 24
away-enlarge.jpg

$filename = $_FILES['file']['name'];
$handle = fopen($filename,'b');
$contents = file_get_contents($filename);

Actually you need to check if the file awas correctly uploaded

Code:

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if (is_uploaded_file($_FILES['file']['tmp_name'])) { //was the file uploaded?
  $filecontents = gile_get_contents($_FILES['file']['tmp_name']);
  unlink($_FILES['file']['tmp_name']); // delete the temp file
  $key = "topSecretPassKey";
$crypted = encrypte($filecontents,$key);
// then do what you want with it

}
function GenerationCle($Texte,$CleDEncryptage)
  {
  $CleDEncryptage = md5($CleDEncryptage);
  $Compteur=0;
  $VariableTemp = "";
  for ($Ctr=0;$Ctr<strlen($Texte);$Ctr++)
    {
    if ($Compteur==strlen($CleDEncryptage))
      $Compteur=0;
    $VariableTemp.= substr($Texte,$Ctr,1) ^ substr($CleDEncryptage,$Compteur,1);
    $Compteur++;
    }
  return $VariableTemp;
  }

function encrypt($Texte,$Cle)
  {
  srand((double)microtime()*1000000);
  $CleDEncryptage = md5(rand(0,32000) );
  $Compteur=0;
  $VariableTemp = "";
  for ($Ctr=0;$Ctr<strlen($Texte);$Ctr++)
    {
    if ($Compteur==strlen($CleDEncryptage))
      $Compteur=0;
    $VariableTemp.= substr($CleDEncryptage,$Compteur,1).(substr($Texte,$Ctr,1) ^ substr($CleDEncryptage,$Compteur,1) );
    $Compteur++;
    }
  return base64_encode(GenerationCle($VariableTemp,$Cle) );
  }

function decrypt($Texte,$Cle)
  {
  $Texte = GenerationCle(base64_decode($Texte),$Cle);
  $VariableTemp = "";
  for ($Ctr=0;$Ctr<strlen($Texte);$Ctr++)
    {
    $md5 = substr($Texte,$Ctr,1);
    $Ctr++;
    $VariableTemp.= (substr($Texte,$Ctr,1) ^ $md5);
    }
  return $VariableTemp;
  }

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