export declare function encryptNip44(plaintext: string, conversationKey: Uint8Array, nonce?: Uint8Array): string;
export declare function decryptNip44(payload: string, conversationKey: Uint8Array): string;
export declare class Nip44 {
    private cache;
    createKey(privkey: Uint8Array, pubkey: string): Uint8Array<ArrayBufferLike>;
    private getKey;
    encrypt(privkey: Uint8Array, pubkey: string, text: string): string;
    decrypt(privkey: Uint8Array, pubkey: string, data: string): string;
}