export declare const xor: (a: Uint8Array, b: Uint8Array) => Uint8Array<ArrayBuffer>;
export declare function concatBytes(...arrays: Uint8Array[]): Uint8Array;
export declare function hexToNumber(hex: string): bigint;
export declare function bytesToNumberBE(bytes: Uint8Array): bigint;
export declare function hexToBytes(hex: string): Uint8Array;
export declare function bytesToHex(bytes: Uint8Array): string;
export declare function numberToBytesBE(n: number | bigint, len: number): Uint8Array;