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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,
			);
			}

			}