<?php
declare(strict_types=1);
namespace ParagonIE\Halite\Structure;
class BlockChain
{
private $startHash;
private $trees;
private $lastHash;
/**
* A block chain data structure
*
* @param string $startHash The hash from which we begin loading trees
* @param MerkleTree $trees
*/
public function __construct(string $startHash = '', MerkleTree ...$trees)
{
$this->startHash = $startHash;
$this->trees = $trees;
$this->lastHash = $this->calculateHash();
}
public function getHash(bool $raw = false): string
{
if ($raw) {
return $this->lastHash;
}
return \Sodium\bin2hex($this->lastHash);
}
/**
*
* @return string
*/
protected function calculateHash(): string
{
$numTrees = \count($this->trees);
$hash = $this->startHash;
for ($i = 0; $i < $numTrees; ++$i) {
$hash = \Sodium\crypto_generichash(
$this->trees[$i]->getRoot(true),
$hash
);
}
return $hash;
}
}
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