export declare class HKDF_SHA256 {
    private readonly hmac;
    constructor();
    extract(salt: Uint8Array | null, ikm: Uint8Array): Uint8Array;
    expand(prk: Uint8Array, info: Uint8Array, length: number): Uint8Array;
    derive(ikm: Uint8Array, salt: Uint8Array | null, info: Uint8Array, length: number): Uint8Array;
    dispose(): void;
}
export declare class HKDF_SHA512 {
    private readonly hmac;
    constructor();
    extract(salt: Uint8Array | null, ikm: Uint8Array): Uint8Array;
    expand(prk: Uint8Array, info: Uint8Array, length: number): Uint8Array;
    derive(ikm: Uint8Array, salt: Uint8Array | null, info: Uint8Array, length: number): Uint8Array;
    dispose(): void;
}