PhabricatorFileROT13StorageFormat.php
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PhabricatorFileROT13StorageFormat.php
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	<?php

	/**
	* Trivial example of a file storage format for at-rest encryption.
	*
	* This format applies ROT13 encoding to file data as it is stored and
	* reverses it on the way out. This encoding is trivially reversible. This
	* format is for testing, developing, and understanding encoding formats and
	* is not intended for production use.
	*/
	final class PhabricatorFileROT13StorageFormat
	extends PhabricatorFileStorageFormat {

	const FORMATKEY = 'rot13';

	public function getStorageFormatName() {
	return pht('Encoded (ROT13)');
	}

	public function newReadIterator($raw_iterator) {
	$file = $this->getFile();
	$iterations = $file->getStorageProperty('iterations', 1);

	$value = $file->loadDataFromIterator($raw_iterator);
	for ($ii = 0; $ii < $iterations; $ii++) {
	$value = str_rot13($value);
	}

	return array($value);
	}

	public function newWriteIterator($raw_iterator) {
	return $this->newReadIterator($raw_iterator);
	}

	public function newStorageProperties() {
	// For extreme security, repeatedly encode the data using a random (odd)
	// number of iterations.
	return array(
	'iterations' => (mt_rand(1, 3) * 2) - 1,
	);
	}

	}