import type { KeyPair } from '../types/passport.js';
export declare function generateKeyPair(): KeyPair;
export declare function sign(message: string, privateKeyHex: string): string;
/**
 * Verify an Ed25519 signature over the UTF-8 bytes of `message`.
 *
 * The public key and the signature's R must be admissible: the canonical
 * encoding of a point that is not of small order. That is the behaviour on
 * which the two strict implementations in the APS family agree, libsodium in
 * agent-passport-python and ed25519-dalek verify_strict in
 * crates/aps-verifier-core, checked over a 2534 vector corpus that includes
 * the Wycheproof Ed25519 suite. Inadmissible key material is refused here so
 * no artifact verifier downstream can accept it.
 */
export declare function verify(message: string, signatureHex: string, publicKeyHex: string): boolean;
export declare function publicKeyFromPrivate(privateKeyHex: string): string;
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