import { _PdfAbstractSyntaxElement } from '../asn1/abstract-syntax';
import { _PdfPublicKeyInformation } from './x509-certificate-key';
import { _PdfX509CertificateStructure } from './x509-certificate-structure';
import { _PdfCipherParameter } from './x509-cipher-handler';
import { _PdfX509ExtensionBase, _PdfX509Extensions } from './x509-extensions';
/**
 * Wrapper around X.509 certificate data and helpers to extract keys and extensions.
 *
 * @private
 */
export declare class _PdfX509Certificate extends _PdfX509ExtensionBase {
    /**
     * Parsed certificate structure backing this certificate.
     *
     * @private
     * @type {_PdfX509CertificateStructure}
     */
    _structure: _PdfX509CertificateStructure;
    /**
     * Raw public key bytes extracted from the certificate (if available).
     *
     * @private
     * @type {Uint8Array}
     */
    _publicKeyBytes: Uint8Array;
    /**
     * Key usage bits parsed from the certificate extensions.
     *
     * @private
     * @type {boolean[]}
     */
    _keyUsage: boolean[];
    constructor(certificate: _PdfX509CertificateStructure);
    /**
     * Retrieve the certificate extensions wrapper when present.
     *
     * @private
     * @returns {_PdfX509Extensions} Certificate extensions container.
     */
    _getExtensions(): _PdfX509Extensions;
    /**
     * Extract and return the public key parameters for this certificate.
     *
     * @private
     * @returns {_PdfCipherParameter} The parsed public key parameters.
     */
    _getPublicKey(): _PdfCipherParameter;
    /**
     * Create a cipher parameter object from SubjectPublicKeyInfo.
     *
     * @private
     * @param {_PdfPublicKeyInformation} publicKeyInfo - Parsed public key information.
     * @returns {_PdfCipherParameter} The created cipher parameter instance.
     */
    _createKey(publicKeyInfo: _PdfPublicKeyInformation): _PdfCipherParameter;
    /**
     * Parse an ASN.1 public key element (e.g., RSA modulus/exponent) into parameters.
     *
     * @private
     * @param {_PdfAbstractSyntaxElement} publicKey - ASN.1 element containing public key data.
     * @returns {_PdfCipherParameter} The parsed cipher parameters.
     */
    _parsePublicKey(publicKey: _PdfAbstractSyntaxElement): _PdfCipherParameter;
    /**
     * Return the DER bytes for the tbsCertificate (to-be-signed certificate).
     *
     * @private
     * @returns {Uint8Array} DER-encoded tbsCertificate bytes.
     */
    _getTobeSignedCertificate(): Uint8Array;
    /**
     * Return the DER encoding for the entire certificate structure.
     *
     * @private
     * @returns {Uint8Array} DER-encoded certificate bytes.
     */
    _getEncoded(): Uint8Array;
    /**
     * Alias for `_getEncoded` returning the encoded certificate bytes.
     *
     * @private
     * @returns {Uint8Array} DER-encoded certificate bytes.
     */
    _getEncodedString(): Uint8Array;
}
/**
 * Simple container for a certificate and cached hash state.
 *
 * @private
 */
export declare class _PdfX509Certificates {
    /**
     * The contained X.509 certificate.
     *
     * @private
     * @type {_PdfX509Certificate}
     */
    _certificate: _PdfX509Certificate;
    /**
     * Cached hash value for this certificate (implementation specific).
     *
     * @private
     * @type {number}
     */
    _hashValue: number;
    /**
     * True when `_hashValue` has been computed and stored.
     *
     * @private
     * @type {boolean}
     */
    _hashValueSet: boolean;
    constructor(certificates: _PdfX509Certificate);
}