export declare const CURVE = "P-256";
export declare function generateEphemeral(): Promise<CryptoKeyPair>;
export declare function generateRecipient(): Promise<CryptoKeyPair>;
export declare function importPublic(raw: Uint8Array): Promise<CryptoKey>;
export declare function exportPublic(key: CryptoKey): Promise<Uint8Array>;
/**
 * The shared AES-GCM key, from one side's private key and the other's public.
 *
 * HKDF rather than the raw ECDH output: WebCrypto's `deriveKey` for ECDH hands
 * back the x-coordinate of the shared point with no key derivation applied,
 * which is usable but is not what anyone wants to be defending later. `info`
 * binds both public keys into the derivation, so a shared secret can only ever
 * produce a key for the pair it actually belongs to.
 */
export declare function sharedKey(privateKey: CryptoKey, publicKey: CryptoKey, recipientRaw: Uint8Array, epkRaw: Uint8Array, usages: KeyUsage[]): Promise<CryptoKey>;
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