export interface KeyResult {
    key: Buffer;
    kid: string;
    algorithm?: string;
    createdAt?: number;
    expiresAt?: number;
}
export declare abstract class KeyProvider {
    abstract getCurrentKey(): Promise<KeyResult>;
    abstract getKey(kid: string): Promise<Buffer | null>;
    abstract rotateKeys(): Promise<void>;
    abstract storeKey(key: Buffer, algorithm: string, expiresAt?: number): Promise<KeyResult>;
}