/** secp256k1 group order n. */
export declare const CURVE_ORDER = 115792089237316195423570985008687907852837564279074904382605163141518161494337n;
/** Reduce `n` into [0, CURVE_ORDER). */
export declare function modCurveOrder(n: bigint): bigint;
/** Big-endian 32-byte encoding of a scalar reduced into [0, n). */
export declare function scalarToBytes(n: bigint): Uint8Array;
/**
 * Cryptographically random 32-byte scalar in [1, n).
 * Rejection sampling — no modular reduction of the RNG output (avoids bias).
 */
export declare function randomScalarBytes(): Uint8Array;
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