/** XOR two Uint8Array arrays */
export declare const xor: (a: Uint8Array, b: Uint8Array) => Uint8Array<ArrayBuffer>;
/** Addition of two 512 bit numbers */
export declare const add512: (a: Uint8Array, b: Uint8Array) => Uint8Array;
/**
 * `S`-transformation.
 * The `S` function is a regular substitution function. Each byte of the
 * 512-bit input sequence is replaced by the corresponding byte from
 * the `PI` substitution table.
 */
export declare const transformS: (input: Uint8Array) => Uint8Array;
/**
 * `P`-transformation.
 * Permutation function. For each pair of bytes from the input sequence,
 * one byte is replaced by another.
 */
export declare const transformP: (input: Uint8Array) => Uint8Array;
/**
 * `L`-transformation.
 * Represents the multiplication of a 64-bit input vector by a 64x64 binary matrix `A`.
 */
export declare const transformL: (input: Uint8Array) => Uint8Array;
/**
 * `E`-transformation.
 * Part of compression function.
 */
export declare const transformE: (block: Uint8Array, keys: Uint8Array) => Uint8Array;
/** Compression function `G` aka XSPLEXX-algorithm */
export declare const transformG: (hash: Uint8Array, n: Uint8Array, message: Uint8Array) => Uint8Array;
/** Convert number to bytes (Big-Endian) */
export declare function numberToBytesBE(n: number | bigint, len: number): Uint8Array;
/** Padding for blocks */
export declare const pad: (data: Uint8Array) => Uint8Array;