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<?php |
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/* |
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* The RandomLib library for securely generating random numbers and strings in PHP |
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* |
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* @author Anthony Ferrara <[email protected]> |
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* @copyright 2011 The Authors |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* @version Build @@version@@ |
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*/ |
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/** |
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* An abstract mixer to implement a common mixing strategy |
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* |
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* PHP version 5.3 |
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* |
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* @category PHPSecurityLib |
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* @package Random |
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* |
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* @author Anthony Ferrara <[email protected]> |
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* @copyright 2011 The Authors |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* |
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* @version Build @@version@@ |
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*/ |
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namespace RandomLib; |
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use SecurityLib\Util; |
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/** |
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* An abstract mixer to implement a common mixing strategy |
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* |
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* @see http://tools.ietf.org/html/rfc4086#section-5.2 |
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* |
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* @category PHPSecurityLib |
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* @package Random |
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* |
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* @author Anthony Ferrara <[email protected]> |
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*/ |
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abstract class AbstractMixer implements \RandomLib\Mixer |
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{ |
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/** |
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* Get the block size (the size of the individual blocks used for the mixing) |
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* |
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* @return int The block size |
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*/ |
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abstract protected function getPartSize(); |
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/** |
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* Mix 2 parts together using one method |
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* |
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* @param string $part1 The first part to mix |
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* @param string $part2 The second part to mix |
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* |
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* @return string The mixed data |
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*/ |
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abstract protected function mixParts1($part1, $part2); |
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/** |
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* Mix 2 parts together using another different method |
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* |
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* @param string $part1 The first part to mix |
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* @param string $part2 The second part to mix |
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* |
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* @return string The mixed data |
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*/ |
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abstract protected function mixParts2($part1, $part2); |
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/** |
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* Mix the provided array of strings into a single output of the same size |
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* |
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* All elements of the array should be the same size. |
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* |
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* @param array $parts The parts to be mixed |
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* |
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* @return string The mixed result |
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*/ |
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public function mix(array $parts) |
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{ |
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if (empty($parts)) { |
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return ''; |
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} |
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$len = Util::safeStrlen($parts[0]); |
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$parts = $this->normalizeParts($parts); |
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$stringSize = count($parts[0]); |
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$partsSize = count($parts); |
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$result = ''; |
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$offset = 0; |
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for ($i = 0; $i < $stringSize; $i++) { |
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$stub = $parts[$offset][$i]; |
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for ($j = 1; $j < $partsSize; $j++) { |
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$newKey = $parts[($j + $offset) % $partsSize][$i]; |
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//Alternately mix the output for each source |
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if ($j % 2 == 1) { |
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$stub ^= $this->mixParts1($stub, $newKey); |
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} else { |
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$stub ^= $this->mixParts2($stub, $newKey); |
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} |
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} |
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$result .= $stub; |
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$offset = ($offset + 1) % $partsSize; |
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} |
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return Util::safeSubstr($result, 0, $len); |
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} |
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/** |
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* Normalize the part array and split it block part size. |
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* |
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* This will make all parts the same length and a multiple |
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* of the part size |
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* |
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* @param array $parts The parts to normalize |
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* |
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* @return array The normalized and split parts |
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*/ |
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protected function normalizeParts(array $parts) |
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{ |
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$blockSize = $this->getPartSize(); |
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$callback = function ($value) { |
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return Util::safeStrlen($value); |
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}; |
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$maxSize = max(array_map($callback, $parts)); |
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if ($maxSize % $blockSize != 0) { |
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$maxSize += $blockSize - ($maxSize % $blockSize); |
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} |
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foreach ($parts as &$part) { |
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$part = $this->str_pad($part, $maxSize, chr(0)); |
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$part = str_split($part, $blockSize); |
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} |
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return $parts; |
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} |
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private function str_pad($string, $size, $character) |
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{ |
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$start = Util::safeStrlen($string); |
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$inc = Util::safeStrlen($character); |
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for ($i = $start; $i < $size; $i+= $inc) { |
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$string = $string . $character; |
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} |
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return Util::safeSubstr($string, 0, $size); |
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} |
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private function str_split($string, $size) |
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{ |
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$blocks = array(); |
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$length = Util::safeStrlen($string); |
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$parts = ceil($length / $size); |
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for ($i = 0; $i < $parts; $i++) { |
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$blocks[] = Util::safeSubstr($string, $i * $length, $length); |
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} |
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return $blocks; |
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} |
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} |
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XOOPS /
XoopsCore25
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