import { SecurityKeyPrivate } from '../private.ts';
/**
 * SecurityKeyPrivateRsa object.
 */
export declare class SecurityKeyPrivateRsa extends SecurityKeyPrivate {
    /**
     * RSA private key in PEM format.
     */
    protected readonly _privateKey: string;
    /**
     * SecurityKeyPrivateRsa constructor.
     *
     * @param privateKey RSA private key in PEM format.
     */
    constructor(privateKey: string);
    /**
     * Sign data.
     *
     * @param data Data to be signed.
     * @param digest Digest algorithm.
     * @returns The signature.
     */
    sign(data: Readonly<Uint8Array>, digest: string): Uint8Array<ArrayBufferLike>;
}