/**
 * Byte-array equality without early-exit in the compare loop.
 * Not a substitute for `crypto.timingSafeEqual` where available; JS cannot
 * give strict constant-time guarantees (GC, etc.).
 */
export declare function equalBytes(a: Uint8Array, b: Uint8Array): boolean;
/** Overwrite a buffer with zeros (best-effort secret clearing). */
export declare function zeroBytes(buf: Uint8Array): void;
export declare function concatBytes(...parts: Uint8Array[]): Uint8Array;
/** Interpret bytes as a big-endian unsigned integer. */
export declare function bytesToScalar(buf: Uint8Array): bigint;
/** Big-endian uint32. Throws if `n` is not an integer in [0, 2^32). */
export declare function u32ToBe(n: number): Uint8Array;
/** Big-endian uint64. Throws if `n` is not an integer in [0, 2^64). */
export declare function bigintToU64Be(n: bigint): Uint8Array;
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