import type { KeyPair } from "./helpers/types.js";
/**
 * Generates a random secp256k1 private key.
 * @returns Private key bytes (32 bytes).
 */
export declare function generatePrivate(): Uint8Array;
/**
 * Converts a public key to compressed SEC1 format.
 * @param publicKey Public key bytes.
 * @returns Compressed public key bytes.
 */
export declare function compress(publicKey: Uint8Array): Uint8Array;
/**
 * Converts a public key to uncompressed SEC1 format.
 * @param publicKey Public key bytes.
 * @returns Uncompressed public key bytes.
 */
export declare function decompress(publicKey: Uint8Array): Uint8Array;
/**
 * Derives an uncompressed public key from a private key.
 * @param privateKey Private key bytes (32 bytes).
 * @returns Uncompressed public key bytes.
 */
export declare function getPublic(privateKey: Uint8Array): Uint8Array;
/**
 * Derives a compressed public key from a private key.
 * @param privateKey Private key bytes (32 bytes).
 * @returns Compressed public key bytes.
 */
export declare function getPublicCompressed(privateKey: Uint8Array): Uint8Array;
/**
 * Generates a secp256k1 key pair.
 * @returns Object with private and public key bytes.
 */
export declare function generateKeyPair(): KeyPair;
/**
 * Converts a compact signature to DER format when needed.
 * @param sig Signature bytes in DER, compact, or recovered format.
 * @returns DER-encoded signature bytes.
 */
export declare function signatureExport(sig: Uint8Array): Uint8Array;
/**
 * Signs a message digest with ECDSA.
 * @param privateKey Private key bytes (32 bytes).
 * @param msg Message digest bytes.
 * @param rsvSig If true, returns recovered format (65 bytes); otherwise compact format (64 bytes).
 * @returns Signature bytes.
 */
export declare function sign(privateKey: Uint8Array, msg: Uint8Array, rsvSig?: boolean): Uint8Array;
/**
 * Recovers a public key from a signature and message digest.
 * @param msg Message digest bytes.
 * @param sig Recovered signature bytes.
 * @param compressed If true, returns compressed public key format.
 * @returns Recovered public key bytes.
 */
export declare function recover(msg: Uint8Array, sig: Uint8Array, compressed?: boolean): Uint8Array;
/**
 * Verifies an ECDSA signature.
 * @param publicKey Public key bytes.
 * @param msg Message digest bytes.
 * @param sig Signature bytes in DER, compact, or recovered format.
 * @throws Error when signature is invalid.
 */
export declare function verify(publicKey: Uint8Array, msg: Uint8Array, sig: Uint8Array): void;
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