export declare class EncryptionService {
    static get encryptionKey(): CryptoKey | null;
    static generateEncryptionKey(username: string, password: string): Promise<CryptoKey>;
    static generatePinKey(username: string, pin: string): Promise<CryptoKey>;
    static setEncryptionKey(key: CryptoKey | null): void;
    static encryptAndReturnPrivateKey(privateKey: string): Promise<string>;
    static decryptPrivateKey(encryptedKeyString: string): Promise<string>;
}