class uc_encryption_class in Ubercart 5

Trimmed down version of GPL class by Tony Marston. Details available at http://www.tonymarston.co.uk/php-mysql/encryption.html

Usage: 1) Create an encryption object. ex: $crypt = new uc_encryption_class; 2) To encrypt string data, use the encrypt method with the key. ex: $encrypted = $crypt->encrypt($key, $string); 3) To decrypt string data, use the decrypt method with the original key. ex: $decrypted = $crypt->decrypt($key, $string); 4) To check for errors, use the errors method to return an array of errors. ex: $errors = $crypt->errors();

Hierarchy

• class \uc_encryption_class

File

uc_store/uc_store.module, line 2661

Contains global Ubercart functions and store administration functionality.

class uc_encryption_class {
  var $scramble1;
  var $scramble2;
  var $errors;
  var $adj;
  var $mod;
  function uc_encryption_class() {
    $this->errors = array();
    $this->scramble1 = '! #$%&()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`"abcdefghijklmnopqrstuvwxyz{|}~';
    $this->scramble2 = 'f^jAE]okIOzU[2&q1{3`h5w_794p@6s8?BgP>dFV=m" D<TcS%Ze|r:lGK/uCy.Jx)HiQ!#$~(;Lt-R}Ma,NvW+Ynb*0X';
    $this->adj = 1.75;
    $this->mod = 3;
  }
  function decrypt($key, $source) {
    $this->errors = array();
    $fudgefactor = $this
      ->_convertKey($key);
    if ($this->errors) {
      return;
    }
    if (empty($source)) {

      // Commented out to prevent errors getting logged for use cases that may
      // have variable encryption/decryption requirements. -RS
      // $this->errors[] = t('No value has been supplied for decryption');
      return;
    }
    $target = NULL;
    $factor2 = 0;
    for ($i = 0; $i < strlen($source); $i++) {
      $char2 = substr($source, $i, 1);
      $num2 = strpos($this->scramble2, $char2);
      if ($num2 === FALSE) {
        $this->errors[] = t('Source string contains an invalid character (!char)', array(
          '!char' => $char2,
        ));
        return;
      }
      $adj = $this
        ->_applyFudgeFactor($fudgefactor);
      $factor1 = $factor2 + $adj;
      $num1 = $num2 - round($factor1);
      $num1 = $this
        ->_checkRange($num1);
      $factor2 = $factor1 + $num2;
      $char1 = substr($this->scramble1, $num1, 1);
      $target .= $char1;
    }
    return rtrim($target);
  }
  function encrypt($key, $source, $sourcelen = 0) {
    $this->errors = array();
    $fudgefactor = $this
      ->_convertKey($key);
    if ($this->errors) {
      return;
    }
    if (empty($source)) {

      // Commented out to prevent errors getting logged for use cases that may
      // have variable encryption/decryption requirements. -RS
      // $this->errors[] = t('No value has been supplied for encryption');
      return;
    }
    while (strlen($source) < $sourcelen) {
      $source .= ' ';
    }
    $target = NULL;
    $factor2 = 0;
    for ($i = 0; $i < strlen($source); $i++) {
      $char1 = substr($source, $i, 1);
      $num1 = strpos($this->scramble1, $char1);
      if ($num1 === FALSE) {
        $this->errors[] = t('Source string contains an invalid character (!char)', array(
          '!char' => $char1,
        ));
        return;
      }
      $adj = $this
        ->_applyFudgeFactor($fudgefactor);
      $factor1 = $factor2 + $adj;
      $num2 = round($factor1) + $num1;
      $num2 = $this
        ->_checkRange($num2);
      $factor2 = $factor1 + $num2;
      $char2 = substr($this->scramble2, $num2, 1);
      $target .= $char2;
    }
    return $target;
  }
  function getAdjustment() {
    return $this->adj;
  }
  function getModulus() {
    return $this->mod;
  }
  function setAdjustment($adj) {
    $this->adj = (double) $adj;
  }
  function setModulus($mod) {
    $this->mod = (int) abs($mod);
  }
  function _applyFudgeFactor(&$fudgefactor) {
    static $alerted = FALSE;
    if (!is_array($fudgefactor)) {
      if (!$alerted) {

        // Throw an error that makes sense so this stops getting reported.
        $this->errors[] = t('No encryption key was found.');
        drupal_set_message(t('Ubercart cannot find a necessary encryption key.  Refer to the store admin <a href="!url">dashboard</a> to isolate which one.', array(
          '!url' => url('admin/store'),
        )), 'error');
        $alerted = TRUE;
      }
    }
    else {
      $fudge = array_shift($fudgefactor);
    }
    $fudge = $fudge + $this->adj;
    $fudgefactor[] = $fudge;
    if (!empty($this->mod)) {
      if ($fudge % $this->mod == 0) {
        $fudge = $fudge * -1;
      }
    }
    return $fudge;
  }
  function _checkRange($num) {
    $num = round($num);
    $limit = strlen($this->scramble1);
    while ($num >= $limit) {
      $num = $num - $limit;
    }
    while ($num < 0) {
      $num = $num + $limit;
    }
    return $num;
  }
  function _convertKey($key) {
    if (empty($key)) {

      // Commented out to prevent errors getting logged for use cases that may
      // have variable encryption/decryption requirements. -RS
      // $this->errors[] = 'No value has been supplied for the encryption key';
      return;
    }
    $array[] = strlen($key);
    $tot = 0;
    for ($i = 0; $i < strlen($key); $i++) {
      $char = substr($key, $i, 1);
      $num = strpos($this->scramble1, $char);
      if ($num === false) {
        $this->errors[] = "Key contains an invalid character ({$char})";
        return;
      }
      $array[] = $num;
      $tot = $tot + $num;
    }
    $array[] = $tot;
    return $array;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
uc_encryption_class::$adj		property
uc_encryption_class::$errors		property
uc_encryption_class::$mod		property
uc_encryption_class::$scramble1		property
uc_encryption_class::$scramble2		property
uc_encryption_class::decrypt		function
uc_encryption_class::encrypt		function
uc_encryption_class::getAdjustment		function
uc_encryption_class::getModulus		function
uc_encryption_class::setAdjustment		function
uc_encryption_class::setModulus		function
uc_encryption_class::uc_encryption_class		function
uc_encryption_class::_applyFudgeFactor		function
uc_encryption_class::_checkRange		function
uc_encryption_class::_convertKey		function