/**
 * Abstraction over persistent key storage for ECDH keypairs used when
 * encrypting job environment variables. Implementations decide whether to
 * persist to disk, a database, or memory.
 *
 * The CLI ships a file-backed implementation (`.acurast/keys.json`); other
 * consumers can supply an in-memory store (see `InMemoryKeyStore`).
 */
export interface KeyStore {
    getItem(key: string): string | null | undefined;
    setItem(key: string, value: string): void;
}
/**
 * Ephemeral `KeyStore` that keeps keys only in process memory. Useful for
 * short-lived scripts or tests where no persistence is desired.
 */
export declare class InMemoryKeyStore implements KeyStore {
    private readonly store;
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
}
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