import type { Signature, SignResult } from "./types.js";
/**
 * Checks whether a public key is in compressed format.
 * @param publicKey Public key bytes.
 * @returns True when key is compressed.
 */
export declare function isCompressed(publicKey: Uint8Array): boolean;
/**
 * Checks whether a public key is in uncompressed format.
 * @param publicKey Public key bytes.
 * @returns True when key is uncompressed.
 */
export declare function isDecompressed(publicKey: Uint8Array): boolean;
/**
 * Checks whether a public key has SEC1 prefix byte.
 * @param publicKey Public key bytes.
 * @returns True when key includes prefix.
 */
export declare function isPrefixed(publicKey: Uint8Array): boolean;
/**
 * Ensures a public key is SEC1-prefixed.
 * @param publicKey Public key bytes.
 * @returns Prefixed public key bytes.
 */
export declare function sanitizePublicKey(publicKey: Uint8Array): Uint8Array;
/**
 * Converts recovery id to Ethereum-style recovery byte.
 * @param recoveryParam Recovery id.
 * @returns Recovery byte as Uint8Array.
 */
export declare function exportRecoveryParam(recoveryParam: number): Uint8Array;
/**
 * Converts recovery byte to recovery id.
 * @param v Recovery byte.
 * @returns Recovery id.
 */
export declare function importRecoveryParam(v: Uint8Array): number;
/**
 * Splits compact signature bytes into r, s, and v components.
 * @param sig Signature bytes.
 * @returns Signature object with r, s, and v.
 */
export declare function splitSignature(sig: Uint8Array): Signature;
/**
 * Joins r, s, and v signature components into byte array.
 * @param sig Signature object.
 * @returns Signature bytes.
 */
export declare function joinSignature(sig: Signature): Uint8Array;
/**
 * Checks whether signature bytes look like DER format.
 * @param sig Signature bytes.
 * @returns True when signature appears DER-encoded.
 */
export declare function isValidDERSignature(sig: Uint8Array): boolean;
/**
 * Converts recovered signature bytes into signature and recovery id.
 * @param sig Recovered signature bytes.
 * @returns Signature bytes and recovery id.
 */
export declare function sanitizeRSVSignature(sig: Uint8Array): SignResult;
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