declare type PayloadType = any;
export declare abstract class SignProvider {
    protected abstract digestLine(line: string): string;
    protected abstract signLine(line: string): string;
    digest(payload: PayloadType): string;
    /**
     * Return sign by line. Check options to set up parameters
     * @param hash base64 encoded line
     */
    sign(hash: string): string;
}
export {};