juju-php/Data/securestring.class.php

<?php
	namespace Juju\Data;
	require_once('encryption.class.php');

	class SecureString implements \JsonSerializable {
		private $data = '';
		private $password;
		private $iv;
		private $encryption;
		private function __construct(string $data){
			$tries = 0;
			$methods = Encryption::methods();
			do{
				$method = $methods[random_int(0, count($methods) - 1)];
				try{
					$this->encryption = Encryption::from($method);
					$ivlen = $this->encryption->iv_len();
					$this->password = openssl_random_pseudo_bytes($ivlen);
					$this->iv = openssl_random_pseudo_bytes($ivlen);
					$this->data = $this->encryption->encrypt($data, $this->password, $this->iv);
				}catch(\Exception $e){}
				if(++$tries == count($methods)){
					throw new \Exception("Too many failed attempts to encrypt data");
				}
			// If for some reason the data we encrypted will not decrypt, try again until it will
			}while($data != (string)$this);
		}
		public function __toString(){
			try{
				return ''.$this->encryption->decrypt($this->data, $this->password, $this->iv);
			}catch(\Exception $e){
				return '';
			}
		}
		public function jsonSerialize(){
			return "{$this}";
		}
		public static function from(string $data){
			return new self($data);
		}
	}
?>