ParagonIE_Sodium_Compat::ristretto255_is_valid_point( string $p, bool $dontFallback = false ): bool

4104    public static function ristretto255_is_valid_point(4105        #[\SensitiveParameter]4106        $p,4107        $dontFallback = false4108    ) {4109        if (self::useNewSodiumAPI() && !$dontFallback) {4110            return sodium_crypto_core_ristretto255_is_valid_point($p);4111        }4112        try {4113            $r = ParagonIE_Sodium_Core_Ristretto255::ristretto255_frombytes($p);4114            return $r['res'] === 0 &&4115                ParagonIE_Sodium_Core_Ristretto255::ristretto255_point_is_canonical($p) === 1;4116        } catch (SodiumException $ex) {4117            if ($ex->getMessage() === 'S is not canonical') {4118                return false;4119            }4120            throw $ex;4121        }4122    }