PhutilHashingIterator.php
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	<?php

	final class PhutilHashingIterator
	extends PhutilProxyIterator
	implements Iterator {

	private $hash;
	private $algorithm;

	public function setAlgorithm($algorithm) {
	$this->algorithm = $algorithm;
	return $this;
	}

	public function getAlgorithm() {
	return $this->algorithm;
	}

	public function getHash() {
	$hash = $this->getHashResource();
	return hash_final($hash, $raw_output = false);
	}

	protected function didReadValue($value) {
	$hash = $this->getHashResource();

	hash_update($hash, $value);

	return $value;
	}

	private function getHashResource() {
	if (!$this->hash) {
	$algorithm = $this->getAlgorithm();
	$this->hash = hash_init($algorithm);
	}
	return $this->hash;
	}

	}