export declare abstract class BaseEncryptor {
    private readonly encryptionSecret;
    private readonly decryptionSecretsByDescriptor;
    constructor(encryptionSecret: string, decryptionSecrets?: string[]);
    protected abstract md5(input: string): string;
    getSecretDescriptor(secret: string): string;
    abstract generateInitialisationVector(): Uint8Array;
    encrypt(input: string): Promise<string>;
    protected abstract _encrypt(input: string, iv: Uint8Array, key: string): Promise<[cipher: Uint8Array, authTag: Uint8Array]>;
    decrypt(string: string): Promise<string>;
    protected abstract _decrypt(cipher: Uint8Array, authTag: Uint8Array | undefined, iv: Uint8Array, key: string): Promise<string>;
}