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Filename : PublicKey.php
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<?php

/*
 * This file is part of the Acme PHP project.
 *
 * (c) Titouan Galopin <galopintitouan@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PleskSslIt\AcmePhp\Ssl;

use PleskSslIt\AcmePhp\Ssl\Exception\KeyFormatException;
use PleskSslIt\Webmozart\Assert\Assert;
/**
 * Represent a SSL Public key.
 *
 * @author Jérémy Derussé <jeremy@derusse.com>
 */
class PublicKey extends Key
{
    /**
     *  {@inheritdoc}
     */
    public function getResource()
    {
        if (!($resource = \openssl_pkey_get_public($this->keyPEM))) {
            throw new KeyFormatException(\sprintf('Failed to convert key into resource: %s', \openssl_error_string()));
        }
        return $resource;
    }
    /**
     * @param $keyDER
     *
     * @return PublicKey
     */
    public static function fromDER($keyDER)
    {
        Assert::stringNotEmpty($keyDER, __METHOD__ . '::$keyDER should be a non-empty string. Got %s');
        $der = \base64_encode($keyDER);
        $lines = \str_split($der, 65);
        \array_unshift($lines, '-----BEGIN PUBLIC KEY-----');
        $lines[] = '-----END PUBLIC KEY-----';
        $lines[] = '';
        return new self(\implode("\n", $lines));
    }
    /**
     * @return string
     */
    public function getHPKP()
    {
        return \base64_encode(\hash('sha256', $this->getDER(), \true));
    }
}