/** Replay window state */
export interface ReplayWindow {
    /** Highest accepted sequence number */
    maxSeen: bigint;
    /** Bitmap: bit i set = sequence (maxSeen - i) was seen */
    bitmap: bigint;
    /** Window size in bits */
    windowSize: bigint;
}
/**
 * Create a new replay window.
 *
 * @param windowSize - Window size in bits (default: 64)
 */
export declare function createReplayWindow(windowSize?: bigint): ReplayWindow;
/**
 * Check if a sequence number is valid (not a replay) and update the window.
 *
 * @returns true if the sequence is valid and accepted, false if it's a replay
 */
export declare function checkAndUpdateReplay(seq: bigint, window: ReplayWindow): boolean;
/**
 * Check if a sequence number would be valid without updating the window.
 *
 * Useful for pre-validation before decryption.
 */
export declare function isValidSequence(seq: bigint, window: ReplayWindow): boolean;
/**
 * Reset the replay window to initial state.
 */
export declare function resetReplayWindow(window: ReplayWindow): void;
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