<?php
declare(strict_types=1);
namespace ParagonIE\Blakechain;
use ParagonIE_Sodium_Compat as SodiumCompat;
use ParagonIE\ConstantTime\Base64UrlSafe;
/**
* Class Node
* @package ParagonIE\Blakechain
*/
class Node
{
/**
* @var string
*/
protected $prevHash = '';
/**
* @var string
*/
protected $data = '';
/**
* @var string
*/
protected $hash = '';
/**
* Node constructor.
*
* @param string $data
* @param string $prevHash
*/
public function __construct(string $data, string $prevHash = '')
{
$this->data = $data;
$this->prevHash = $prevHash;
}
/**
* @param bool $rawBinary
* @return string
*/
public function getPrevHash(bool $rawBinary = false): string
{
if ($rawBinary) {
return $this->prevHash;
}
return Base64UrlSafe::encode($this->prevHash);
}
/**
* @param bool $rawBinary
* @return string
*
* @throws \SodiumException
*/
public function getHash(bool $rawBinary = false): string
{
if (empty($this->hash)) {
$this->hash = SodiumCompat::crypto_generichash(
$this->data,
$this->prevHash,
Blakechain::HASH_SIZE
);
}
if ($rawBinary) {
return $this->hash;
}
return Base64UrlSafe::encode($this->hash);
}
/**
* @return string
*/
public function getData(): string
{
return $this->data;
}
/**
* @param string $prevHash
* @return self
*/
public function setPrevHash(string $prevHash): self
{
$this->prevHash = $prevHash;
$this->hash = '';
return $this;
}
}
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