import { _PdfPublicKeyInformation } from './x509/x509-certificate-key';
/**
 * Helper that computes and stores a subject key identifier (SHA-1 of the public key).
 *
 * @private
 */
export declare class _PdfSubjectKeyIdentifier {
    /**
     * Raw key identifier bytes (SHA-1 digest of subject public key).
     *
     * @private
     * @type {Uint8Array}
     */
    _bytes: Uint8Array;
    constructor(info: _PdfPublicKeyInformation);
    /**
     * Compute the key identifier as SHA-1 over the subject public key bytes.
     *
     * @private
     * @param {_PdfPublicKeyInformation} info - Subject public key information.
     * @returns {Uint8Array} SHA-1 digest bytes representing the key identifier.
     */
    _generateKeyID(info: _PdfPublicKeyInformation): Uint8Array;
}