import { IFileStorage, OCPP2_0_1, SystemConfig } from '@citrineos/base';
import { ILogObj, Logger } from 'tslog';
/**
 * Util to process and validate signed meter values.
 */
export declare class SignedMeterValuesUtil {
    private readonly _fileStorage;
    private readonly _logger;
    private readonly _chargingStationSecurityInfoRepository;
    private readonly _signedMeterValuesConfiguration;
    /**
     * @param {IFileStorage} [fileStorage] - The `fileStorage` allows access to the configured file storage.
     *
     * @param {SystemConfig} config - The `config` contains the current system configuration settings.
     *
     * @param {Logger<ILogObj>} [logger] - The `logger` represents an instance of {@link Logger<ILogObj>}.
     *
     */
    constructor(fileStorage: IFileStorage, config: SystemConfig, logger: Logger<ILogObj>);
    /**
     * Checks the validity of a meter value.
     *
     * If a meter value is unsigned, it is valid.
     *
     * If a meter value is signed, it is valid if:
     * - SignedMeterValuesConfig is configured
     * AND
     * - The incoming signed meter value's signing method matches the configured signing method
     * AND
     * - The incoming signed meter value's public key is empty but there is a public key stored for that charging station
     * OR
     * - The incoming signed meter value's public key isn't empty and it matches the configured public key
     *
     * @param stationId - The charging station the meter values belong to
     * @param meterValues - The list of meter values
     */
    validateMeterValues(stationId: string, meterValues: [OCPP2_0_1.MeterValueType, ...OCPP2_0_1.MeterValueType[]]): Promise<boolean>;
    private validateSignedSampledValue;
    private validateSignedMeterValueSignature;
    private validateRsaSignature;
    private formatKey;
}