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PHP performs hash operation on files

WBOY
WBOYOriginal
2016-07-25 08:43:181043browse

This code is very useful. If you download a file and the website provides a hash result, you can perform a hash operation on the file you downloaded to verify whether the downloaded file is correct.

  3. Hash (Check) Files
  7. if(!empty($_FILES)){
  8. if ($_FILES["file"]["error"] > 0){
  9. switch($_FILES["file"]["error"]){
  10. case 1:
  11. echo "Error: The uploaded file exceeds the upload_max_filesize directive in php.ini
    ";
  12. break;
  13. case 2:
  14. echo "Error: The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
    ";
  15. break;
  16. case 3:
  17. echo "Error: The uploaded file was only partially uploaded.
    ";
  18. break;
  19. case 4:
  20. echo "Error: No file was uploaded.
    ";
  21. break;
  22. case 6:
  23. echo "Error: Missing a temporary folder.
    ";
  24. break;
  25. case 7:
  26. echo "Error: Failed to write file to disk.
    ";
  27. break;
  28. case 8:
  29. echo "Error: A PHP extension stopped the file upload.
    ";
  30. break;
  31. default:
  32. echo "Unknown error occured.
    ";
  33. }
  34. } else {
  35. echo 'Upload: ' . $_FILES['file']['name'] . '
    ';
  36. echo 'Type: ' . $_FILES['file']['type'] . '
    ';
  37. echo 'Size: ' . (round($_FILES['file']['size'] / 1024, 2)) . ' Kb

    ';
  38. if(array_search($_POST['algo'], hash_algos())===false){
  39. echo 'Unknown hashing algorithm requested.
    ';
  40. } else {
  41. echo 'Hashing Algorithm: '. $_POST['algo'] . '
    ';
  42. $hash = hash_file($_POST['algo'], $_FILES['file']['tmp_name']);
  43. echo 'Calculated hash: ' . $hash . '
    ';
  44. if($_POST['exphash']!=='none' && !empty($_POST['exphash'])){
  45. echo 'Expected hash:   ' . $_POST['exphash'] . '

    ';
  46. echo ($hash==$_POST['exphash'])? 'Hash matched expected value.' : 'Hash did not match expected value.';
  47. echo '
    ';
  48. }
  49. }
  50. }
  51. ?>

  54. }else {
  55. ?>



  62. Choose an algorithm (This is the list of all the available algorithms in your php installation)
  64. foreach(hash_algos() as $algo){
  65. if($algo=='md5'){
  66. echo "
    ";
  67. } else {
  68. echo "
    ";
  69. }
  70. }
  71. ?>
  73. }
  74. ?>
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php, hash


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