private function PHPExcel_Reader_Excel5::_verifyPassword in Loft Data Grids 7.2

Same name and namespace in other branches

1. 6.2 vendor/phpoffice/phpexcel/Classes/PHPExcel/Reader/Excel5.php \PHPExcel_Reader_Excel5::_verifyPassword()

* Verify RC4 file password * * * @var string $docid Document id * @var string $salt_data Salt data * @var string $hashedsalt_data Hashed salt data * @var string &$valContext Set to the MD5 context of the value * *

Return value

bool Success

1 call to PHPExcel_Reader_Excel5::_verifyPassword()

PHPExcel_Reader_Excel5::_readFilepass in vendor/phpoffice/phpexcel/Classes/PHPExcel/Reader/Excel5.php

* FILEPASS * * This record is part of the File Protection Block. It * contains information about the read/write password of the * file. All record contents following this record will be * encrypted. * * -- "OpenOffice.org's…

File

vendor/phpoffice/phpexcel/Classes/PHPExcel/Reader/Excel5.php, line 1742

Class

PHPExcel_Reader_Excel5

PHPExcel_Reader_Excel5

Code

private function _verifyPassword($password, $docid, $salt_data, $hashedsalt_data, &$valContext) {
  $pwarray = str_repeat("\0", 64);
  for ($i = 0; $i < strlen($password); $i++) {
    $o = ord(substr($password, $i, 1));
    $pwarray[2 * $i] = chr($o & 0xff);
    $pwarray[2 * $i + 1] = chr($o >> 8 & 0xff);
  }
  $pwarray[2 * $i] = chr(0x80);
  $pwarray[56] = chr($i << 4 & 0xff);
  $md5 = new PHPExcel_Reader_Excel5_MD5();
  $md5
    ->add($pwarray);
  $mdContext1 = $md5
    ->getContext();
  $offset = 0;
  $keyoffset = 0;
  $tocopy = 5;
  $md5
    ->reset();
  while ($offset != 16) {
    if (64 - $offset < 5) {
      $tocopy = 64 - $offset;
    }
    for ($i = 0; $i <= $tocopy; $i++) {
      $pwarray[$offset + $i] = $mdContext1[$keyoffset + $i];
    }
    $offset += $tocopy;
    if ($offset == 64) {
      $md5
        ->add($pwarray);
      $keyoffset = $tocopy;
      $tocopy = 5 - $tocopy;
      $offset = 0;
      continue;
    }
    $keyoffset = 0;
    $tocopy = 5;
    for ($i = 0; $i < 16; $i++) {
      $pwarray[$offset + $i] = $docid[$i];
    }
    $offset += 16;
  }
  $pwarray[16] = "";
  for ($i = 0; $i < 47; $i++) {
    $pwarray[17 + $i] = "\0";
  }
  $pwarray[56] = "";
  $pwarray[57] = "\n";
  $md5
    ->add($pwarray);
  $valContext = $md5
    ->getContext();
  $key = $this
    ->_makeKey(0, $valContext);
  $salt = $key
    ->RC4($salt_data);
  $hashedsalt = $key
    ->RC4($hashedsalt_data);
  $salt .= "" . str_repeat("\0", 47);
  $salt[56] = "";
  $md5
    ->reset();
  $md5
    ->add($salt);
  $mdContext2 = $md5
    ->getContext();
  return $mdContext2 == $hashedsalt;
}