cloud_bbb/lib/Crypto.php

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<?php
namespace OCA\BigBlueButton;
use OCP\Security\ICrypto;
class Crypto {
/** @var ICrypto */
private $crypto;
public function __construct(
ICrypto $crypto
) {
$this->crypto = $crypto;
}
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/**
* @return false|string
*/
public function calculateHMAC(string $message) {
if ($message === null) {
throw new \InvalidArgumentException();
}
return $this->encodeBase64UrlSafe(\sha1($this->crypto->calculateHMAC($message), true));
}
public function verifyHMAC(string $message, string $mac): bool {
if ($message === null || $mac === null) {
return false;
}
$validMac = $this->encodeBase64UrlSafe(\sha1($this->crypto->calculateHMAC($message), true));
return $validMac === $mac;
}
/**
* @return false|string
*/
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private function encodeBase64UrlSafe(string $data) {
$b64 = \base64_encode($data);
if ($b64 === false) {
return false;
}
return \rtrim(\strtr($b64, '+/', '-_'), '=');
}
}