juju-php/Data/securestring.class.php

<?php
	namespace Juju\Data;

	class SecureString implements \JsonSerializable {
		private $data;
		private $password;
		private $iv;
		private $method;
		private static $methods = null;
		private function __construct(string $data){
			do{
				if(is_null(self::$methods)){
					self::$methods = openssl_get_cipher_methods();
				}
				$this->method = self::$methods[random_int(0, count(self::$methods) - 1)];
				$ivlen = openssl_cipher_iv_length($this->method);
				$this->password = openssl_random_pseudo_bytes($ivlen);
				$this->iv = openssl_random_pseudo_bytes($ivlen);
				$this->data = openssl_encrypt($data, $this->method, $this->password, \OPENSSL_RAW_DATA, $this->iv);
			// If for some reason the data we encrypted will not decrypt, try again until it will
			}while($data != (string)$this);
		}
		public function __toString(){
			return openssl_decrypt($this->data, $this->method, $this->password, \OPENSSL_RAW_DATA, $this->iv);
		}
		public function jsonSerialize(){
			return "{$this}";
		}
		public static function from(string $data){
			return new self($data);
		}
	}
?>