簡述php對文件進行hash運算

墨辰丷原創: 2018-06-11 17:00:312126瀏覽

這篇文章主要介紹了php對文件進行hash運算的方法,涉及針對文件的hash運算技巧,非常具有實用價值,需要的朋友可以參考下

本文實例講述了php對文件進行hash運算的方法。具體如下：

這段程式碼非常有用，如果你下載了一個文件，網站提供了hash結果，你可以對你下載下來的文件進行hash運算，以驗證下載的文件是否正確。

<html>
<head>
  <title>Hash (Check) Files</title>
  <style type=&#39;text/css&#39;>
   #ok{color:green;}
   #nono{color:red;}
  </style>
</head>
<body>
 <?php
   if(!empty($_FILES)){
   if ($_FILES["file"]["error"] > 0){
    switch($_FILES["file"]["error"]){
     case 1:
     echo "<b id=&#39;nono&#39;>Error: The uploaded file exceeds the upload_max_filesize directive in php.ini</b><br>";
     break;
     case 2:
     echo "<b id=&#39;nono&#39;>Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.</b><br>";
     break;
     case 3:
     echo "<b id=&#39;nono&#39;>Error: The uploaded file was only partially uploaded.</b><br>";
     break;
     case 4:
     echo "<b id=&#39;nono&#39;>Error: No file was uploaded.</b><br>";
     break;
     case 6:
     echo "<b id=&#39;nono&#39;>Error: Missing a temporary folder.</b><br>";
     break;
     case 7:
     echo "<b id=&#39;nono&#39;>Error: Failed to write file to disk.</b><br>";
     break;
     case 8:
     echo "<b id=&#39;nono&#39;>Error: A PHP extension stopped the file upload.</b><br>";
     break;
     default:
     echo "<b id=&#39;nono&#39;>Unknown error occured.</b><br>";
    }
   } else {
    echo &#39;Upload: &#39; . $_FILES[&#39;file&#39;][&#39;name&#39;] . &#39;<br>&#39;;
    echo &#39;Type: &#39; . $_FILES[&#39;file&#39;][&#39;type&#39;] . &#39;<br>&#39;;
    echo &#39;Size: &#39; . (round($_FILES[&#39;file&#39;][&#39;size&#39;] / 1024, 2)) . &#39; Kb<br><br>&#39;;
    if(array_search($_POST[&#39;algo&#39;], hash_algos())===false){
    echo &#39;Unknown hashing algorithm requested.<br>&#39;;
    } else {
    echo &#39;Hashing Algorithm: &#39;. $_POST[&#39;algo&#39;] . &#39;<br>&#39;;
    $hash = hash_file($_POST[&#39;algo&#39;], $_FILES[&#39;file&#39;][&#39;tmp_name&#39;]);
    echo &#39;Calculated hash: &#39; . $hash . &#39;<br>&#39;;
    if($_POST[&#39;exphash&#39;]!==&#39;none&#39; && !empty($_POST[&#39;exphash&#39;])){
      echo &#39;Expected hash:   &#39; . $_POST[&#39;exphash&#39;] . &#39;<br><br>&#39;;
      echo ($hash==$_POST[&#39;exphash&#39;])? &#39;<b id="ok">Hash matched expected value.</b>&#39; : &#39;<b id="nono">Hash did not match expected value.</b>&#39;;
      echo &#39;<br>&#39;;
    }
    }
   }
   ?>
   <br>
   <button onClick="document.location.reload(true)">Again</button>
    <?php
   } else {
  ?>
  <form action="" method="post" enctype="multipart/form-data">
   <input type="hidden" name="exphash" value="none">
   <label for="file">Filename:</label>
   <input type="file" name="file" id="file">
   <input type="submit" name="submit" value="Submit" /><br>
   <label>Expected hash(optional): <input type="text" name="exphash" size="100"></label>
   <br><br>Choose an algorithm (This is the list of all the available algorithms in your php installation)<br>
   <?php
   foreach(hash_algos() as $algo){
    if($algo==&#39;md5&#39;){
    echo "<label><input type=&#39;radio&#39; name=&#39;algo&#39; value=&#39;$algo&#39; checked=&#39;checked&#39;>$algo</label><br>";
    } else {
    echo "<label><input type=&#39;radio&#39; name=&#39;algo&#39; value=&#39;$algo&#39;>$algo</label><br>";
    }
   }
   ?>
  </form>
 <?php
   }
  ?>
</body>
</html>

總結：以上就是這篇文章的全部內容，希望能對大家的學習有所幫助。

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