/**
 * `KDF_GOSTR3411_2012_256`
 *
 * @param key Initial key
 * @param label Label
 * @param seed Seed
 */
export declare const kdf_gostr3411_2012_256: (key: Uint8Array, label: Uint8Array, seed: Uint8Array) => Uint8Array;
/**
 * `KDF_TREE_GOSTR3411_2012_256`
 *
 * @param key Initial key
 * @param label Label
 * @param seed Seed
 * @param keys Number of generated keys
 * @param i_len Length of iterations value (`R`)
 */
export declare const kdf_tree_gostr3411_2012_256: (key: Uint8Array, label: Uint8Array, seed: Uint8Array, keys: number, i_len?: number) => Uint8Array[];