import { _PdfNativeAlgorithmIdentifier } from './pdf-accumulator';
/**
 * Builds the internal DER-encoded DigestInfo structure for a given AlgorithmIdentifier and digest.
 *
 * @private
 */
export declare class _PdfDigestInformation {
    private _algorithm;
    private _digest;
    constructor(algorithm: _PdfNativeAlgorithmIdentifier, digest: Uint8Array);
    /**
     * Encodes the DigestInfo structure as DER: SEQUENCE { AlgorithmIdentifier, OCTET STRING digest }.
     *
     * @private
     * @returns {Uint8Array} The DER-encoded DigestInfo bytes.
     */
    _getUniqueEncoded(): Uint8Array;
    /**
     * Encodes a length using DER definite-length rules.
     *
     * @private
     * @param {number} length The content length to encode.
     * @returns {number[]} The DER-encoded length bytes.
     */
    _getLengthBytes(length: number): number[];
}