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php对文件进行hash运算的方法

转载 作者:qq735679552 更新时间:2022-09-27 22:32:09 29 4
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本文实例讲述了php对文件进行hash运算的方法。分享给大家供大家参考。具体如下:

这段代码非常有用,如果你下载了一个文件,网站提供了hash结果,你可以对你下载下来的文件进行hash运算,以验证下载的文件是否正确.

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<html>
<head>
   <title>Hash (Check) Files</title>
   <style type= 'text/css' >
    #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='nono'>Error: The uploaded file exceeds the upload_max_filesize directive in php.ini</b><br>" ;
      break ;
      case 2:
      echo "<b id='nono'>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='nono'>Error: The uploaded file was only partially uploaded.</b><br>" ;
      break ;
      case 4:
      echo "<b id='nono'>Error: No file was uploaded.</b><br>" ;
      break ;
      case 6:
      echo "<b id='nono'>Error: Missing a temporary folder.</b><br>" ;
      break ;
      case 7:
      echo "<b id='nono'>Error: Failed to write file to disk.</b><br>" ;
      break ;
      case 8:
      echo "<b id='nono'>Error: A PHP extension stopped the file upload.</b><br>" ;
      break ;
      default :
      echo "<b id='nono'>Unknown error occured.</b><br>" ;
     }
    } else {
     echo 'Upload: ' . $_FILES [ 'file' ][ 'name' ] . '<br>' ;
     echo 'Type: ' . $_FILES [ 'file' ][ 'type' ] . '<br>' ;
     echo 'Size: ' . ( round ( $_FILES [ 'file' ][ 'size' ] / 1024, 2)) . ' Kb<br><br>' ;
     if ( array_search ( $_POST [ 'algo' ], hash_algos())===false){
     echo 'Unknown hashing algorithm requested.<br>' ;
     } else {
     echo 'Hashing Algorithm: ' . $_POST [ 'algo' ] . '<br>' ;
     $hash = hash_file( $_POST [ 'algo' ], $_FILES [ 'file' ][ 'tmp_name' ]);
     echo 'Calculated hash: ' . $hash . '<br>' ;
     if ( $_POST [ 'exphash' ]!== 'none' && ! empty ( $_POST [ 'exphash' ])){
       echo 'Expected hash: &nbsp;&nbsp;' . $_POST [ 'exphash' ] . '<br><br>' ;
       echo ( $hash == $_POST [ 'exphash' ])? '<b id="ok">Hash matched expected value.</b>' : '<b id="nono">Hash did not match expected value.</b>' ;
       echo '<br>' ;
     }
     }
    }
    ?>
    <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 ( $algo == 'md5' ){
     echo "<label><input type='radio' name='algo' value='$algo' checked='checked'>$algo</label><br>" ;
     } else {
     echo "<label><input type='radio' name='algo' value='$algo'>$algo</label><br>" ;
     }
    }
    ?>
   </form>
  <?php
    }
   ?>
</body>
</html>

希望本文所述对大家的php程序设计有所帮助.

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