import { ByteArray } from '../../types.js';
/**
 * Compute the master encryption key for a PDF file.
 *
 * @param password User-supplied password (empty if no password)
 * @param ownerKey Owner key (/O value)
 * @param permissions /P value
 * @param id0 First element of /ID array
 * @param keyLengthBits Usually 40, 128 or 256
 * @param encryptMetadata Whether /EncryptMetadata is false
 */
export declare function computeMasterKey(password: ByteArray, ownerKey: ByteArray, permissions: number, id0: ByteArray, keyLengthBits: number, encryptMetadata: boolean, revision?: number): Promise<ByteArray>;
/**
 * Derives an object-specific encryption key from the master key.
 * Used to encrypt individual PDF objects with unique keys.
 *
 * @param mkey - The master encryption key.
 * @param objNumber - The PDF object number.
 * @param objGeneration - The PDF object generation number.
 * @param useAesSalt - Whether to include the AES salt ('sAlT'). Defaults to true.
 * @returns A promise that resolves to the derived object key.
 *
 * @example
 * ```typescript
 * const objectKey = await deriveObjectKey(masterKey, 5, 0)
 * ```
 */
export declare function deriveObjectKey(mkey: ByteArray, objNumber: number, objGeneration: number, useAesSalt?: boolean): Promise<ByteArray>;