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*/ class Google_Verifier_Pem extends Google_Verifier_Abstract { private $publicKey; /** * Constructs a verifier from the supplied PEM-encoded certificate. * * $pem: a PEM encoded certificate (not a file). * @param $pem * @throws Google_Auth_Exception * @throws Google_Exception */ public function __construct($pem) { if (!function_exists('openssl_x509_read')) { throw new Google_Exception('Google API PHP client needs the openssl PHP extension'); } $this->publicKey = openssl_x509_read($pem); if (!$this->publicKey) { throw new Google_Auth_Exception("Unable to parse PEM: $pem"); } } public function __destruct() { if ($this->publicKey) { openssl_x509_free($this->publicKey); } } /** * Verifies the signature on data. * * Returns true if the signature is valid, false otherwise. * @param $data * @param $signature * @throws Google_Auth_Exception * @return bool */ public function verify($data, $signature) { $hash = defined("OPENSSL_ALGO_SHA256") ? OPENSSL_ALGO_SHA256 : "sha256"; $status = openssl_verify($data, $signature, $this->publicKey, $hash); if ($status === -1) { throw new Google_Auth_Exception('Signature verification error: ' . openssl_error_string()); } return $status === 1; } }