PhutilOpaqueEnvelopeKey.php
01e849c9bafcproduction

PhutilOpaqueEnvelopeKey.php
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			<?php

			/**
			* Holds the key for @{class:PhutilOpaqueEnvelope} in a logically distant
			* location so it will never appear in stack traces, etc. You should never need
			* to use this class directly. See @{class:PhutilOpaqueEnvelope} for
			* information about opaque envelopes.
			*
			* @task internal Internals
			*/
			final class PhutilOpaqueEnvelopeKey {

			private static $key;


			/* -( Internals )---------------------------------------------------------- */


			/**
			* @task internal
			*/
			private function __construct() {
			// <private>
			}


			/**
			* @task internal
			*/
			public static function getKey() {
			if (self::$key === null) {
			// NOTE: We're using a weak random source because cryptographic levels
			// of security aren't terribly important here and it allows us to use
			// envelopes on systems which don't have a strong random source. Notably,
			// this lets us make it to the readbility check for `/dev/urandom` in
			// Phabricator on systems where we can't read it.
			self::$key = '';
			for ($ii = 0; $ii < 8; $ii++) {
			self::$key .= md5(mt_rand(), $raw_output = true);
			}
			}
			return self::$key;
			}

			}