import { ByteArray } from '../types.js';
/**
 * Pads a password to exactly 32 bytes using the PDF standard padding.
 * If the password is shorter than 32 bytes, it is padded with bytes from DEFAULT_PADDING.
 * If the password is 32 bytes or longer, only the first 32 bytes are used.
 *
 * @param password - The password to pad.
 * @returns A 32-byte padded password.
 *
 * @example
 * ```typescript
 * const padded = padPassword(new Uint8Array([1, 2, 3])) // Returns 32-byte array
 * ```
 */
export declare function padPassword(password: ByteArray): ByteArray;
/**
 * Converts a 32-bit integer to a 4-byte little-endian byte array.
 *
 * @param value - The 32-bit integer to convert.
 * @returns A 4-byte array in little-endian order.
 *
 * @example
 * ```typescript
 * int32ToLittleEndianBytes(0x12345678) // Returns [0x78, 0x56, 0x34, 0x12]
 * ```
 */
export declare function int32ToLittleEndianBytes(value: number): ByteArray;
/**
 * Removes PDF standard password padding from a buffer.
 * Searches from the end of the buffer for the padding pattern and removes it.
 *
 * @param buffer - The buffer with potential password padding.
 * @returns The buffer with padding removed.
 *
 * @example
 * ```typescript
 * const unpadded = removePdfPasswordPadding(paddedPassword)
 * ```
 */
export declare function removePdfPasswordPadding(buffer: ByteArray): Uint8Array<ArrayBuffer>;