import { CertificateHandler } from './certificate-handler';
import { Invoice } from '../models/invoice';
import { SignedInvoice } from '../models/signed-invoice';
/**
 * Handles document signing operations
 */
export declare class DocumentSigner {
    private certificateHandler;
    /**
     * Creates a new document signer
     * @param certificateHandler The certificate handler to use
     */
    constructor(certificateHandler: CertificateHandler);
    /**
     * Signs an invoice
     * @param invoice The invoice to sign
     * @returns A signed invoice
     */
    signInvoice(invoice: Invoice): Promise<SignedInvoice>;
    /**
     * Transforms the document for signing
     * @param document The document to transform
     * @returns The transformed document as a string
     */
    private transformForSigning;
    /**
     * Generates a document hash
     * @param document The document to hash
     * @returns The document hash
     */
    private generateDocumentHash;
    /**
     * Creates signed properties
     * @returns The signed properties
     */
    private createSignedProperties;
    /**
     * Generates a hash for the signed properties
     * @param signedProperties The signed properties
     * @returns The signed properties hash
     */
    private generateSignedPropertiesHash;
    /**
     * Creates signature information
     * @param signature The signature
     * @param documentHash The document hash
     * @param signedProperties The signed properties
     * @param signedPropertiesHash The signed properties hash
     * @returns The signature information
     */
    private createSignatureInfo;
}