Add an encryption system

htdocs/index.php

@@ -19,8 +19,32 @@ foreach ($_GET as $k => $t)
       {
         $paste = new Paste($kout[1]);
 
-        if (!empty($kout[3]) && is_file(Paste::get_path($kout[3])))
+        if (!empty($paste->crypt) && empty($_POST["passwd"]))
-          $diff = new Paste($kout[3]);
+        {
+          ?>
+    <div id="corps" style="text-align: center;">
+      <h1>
+       <?php echo htmlentities($paste->title); ?>
+      </h1>
+      <h2><?php echo $paste->get_subtitle(); ?></h2>
+      <div>
+        <form method="post" action="?<?php echo $kout[1]; ?>">
+	  <fieldset class="paste_form">
+	    <label for="title">Mot de passe :</label>
+	    <input type="password" size="42" id="passwd" name="passwd">
+            <br><br>
+	    <input type="submit" value="Voir le texte">
+	  </fieldset>
+        </form>
+          <?php
+        }
+        else
+        {
+          if (!empty($paste->crypt))
+            $paste->crypt($_POST["passwd"]);
+
+          if (!empty($kout[3]) && is_file(Paste::get_path($kout[3])))
+            $diff = new Paste($kout[3]);
 	?>
     <div id="corps" style="text-align: center;">
       <h1>
@@ -33,11 +57,12 @@ foreach ($_GET as $k => $t)
          <?php echo $paste->get_ref(isset($diff)); ?>
        </div>
 	<?php
-         if (isset($diff))
+           if (isset($diff))
-           echo $paste->get_diff($diff);
+             echo $paste->get_diff($diff);
-         else
+           else
-           echo $paste->get_code();
+             echo $paste->get_code();
-        echo $paste->show_answers();
+          echo $paste->show_answers();
+        }
         ?>
       </div>
     </div>
@@ -67,9 +92,11 @@ else
       <form method="post" action="save.php">
 	<fieldset class="paste_form">
 	  <label for="title">Titre :</label>
-	  <input type="text" size="50" id="title" name="title" value="<?php
+	  <input type="text" size="42" id="title" name="title" value="<?php
             echo $paste->title;
           ?>">
+	  <label for="author">Auteur :</label>
+	  <input type="text" maxlength="64" size="25" id="author" name="author">
           <br><br>
 
 	  <label for="content">Contenu :</label><br>
@@ -77,8 +104,8 @@ else
             echo htmlentities(utf8_decode($paste->content));
           ?></textarea><br><br>
 
-	  <label for="author">Auteur :</label>
+          <label for="crypt" style="font-style: italic;">Mot de passe :</label>
-	  <input type="text" maxlength="64" size="35" id="author" name="author">
+	  <input type="text" maxlength="64" size="25" id="crypt" name="crypt">
 
 	  <label for="lang">Langage :</label>
 	  <select id="lang" name="lang">

paste.class.php

@@ -14,6 +14,7 @@ class Paste
   var $ip;
   var $ref = NULL;
   var $hash;
+  var $crypt = NULL;
   var $answers = array();
 
   /**
@@ -30,6 +31,29 @@ class Paste
     }
   }
 
+  static function cxor($msg, $cle)
+  {
+    $cle = hash("whirlpool", $cle);
+
+    $xor = NULL;
+    for($i = 0; $i < strlen($msg); $i++)
+      $xor .= substr($msg,$i,1) ^ substr($cle, $i % strlen($cle), 1);
+    return $xor;
+  }
+
+  function crypt($key)
+  {
+    if (!empty($this->crypt))
+      $this->crypt = Paste::cxor($this->crypt, $key);
+    else
+      $this->crypt = Paste::cxor(sha1($key), $key);
+
+    if ($this->crypt == sha1($key))
+      $this->content = Paste::cxor(base64_decode($this->content), $key);
+    else
+      $this->content = base64_encode(Paste::cxor($this->content, $key));
+  }
+
   /**
    * Load or reload the file and set attributes
    */
@@ -58,6 +82,11 @@ class Paste
       else
         $this->hash = NULL;
 
+      if ($doc->getElementsByTagName("crypt")->length > 0)
+        $this->crypt = base64_decode($doc->getElementsByTagName("crypt")->item(0)->textContent);
+      else
+        $this->crypt = NULL;
+
       for ($i = 0; $i < $doc->getElementsByTagName("answer")->length; $i++)
         $this->answers[] = $doc->getElementsByTagName("answer")->item($i)->textContent;
 
@@ -130,6 +159,9 @@ class Paste
     $xml_paste->appendChild(
         $xml->createElement("content", $this->content));
 
+    if (!empty($this->crypt))
+      $xml_paste->appendChild(
+        $xml->createElement("crypt", base64_encode($this->crypt)));
     if (!empty($this->ref))
     {
       //Also indicate in the parent file
@@ -179,6 +211,9 @@ class Paste
 
     //TODO: allow uploading file
     $this->content = $dict["content"];
+
+    if (!empty($dict["crypt"]))
+      $this->crypt($dict["crypt"]);
   }
 
   /**