/**
 * XOR utility functions for CBL whitening operations.
 * These utilities wrap XorService and add padding/unpadding for block-aligned storage.
 */
/**
 * XOR two Uint8Arrays of equal length.
 * Delegates to XorService.xor for the actual XOR operation.
 *
 * @param a - First array
 * @param b - Second array
 * @returns XOR result (a ⊕ b)
 * @throws Error if arrays have different lengths
 */
export declare function xorArrays(a: Uint8Array, b: Uint8Array): Uint8Array;
/**
 * XOR multiple Uint8Arrays of equal length together.
 * Delegates to XorService.xorMultiple for the actual XOR operation.
 *
 * @param arrays - Array of Uint8Arrays to XOR together (must all be same length)
 * @returns XOR result
 * @throws Error if arrays have different lengths or if no arrays provided
 */
export declare function xorMultipleArrays(arrays: Uint8Array[]): Uint8Array;
/**
 * Pad data to a multiple of block size with length prefix and random bytes.
 * The padding ensures that the data aligns with block boundaries.
 *
 * Format: [4-byte length prefix][original data][random padding]
 *
 * @param data - The data to pad
 * @param blockSize - The target block size
 * @returns Padded data with length prefix
 */
export declare function padToBlockSize(data: Uint8Array, blockSize: number): Uint8Array;
/**
 * Remove padding from CBL data by reading the length prefix.
 * The length prefix tells us exactly how many bytes of original data follow.
 *
 * Format: [4-byte length prefix][original data][random padding]
 *
 * @param data - The padded CBL data with length prefix
 * @returns Unpadded CBL data (original data without length prefix or padding)
 * @throws Error if data is too short or length prefix is invalid
 */
export declare function unpadCblData(data: Uint8Array): Uint8Array;
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