export type GatewayIdentity = {
    id: string;
    publicKey: string;
    privateKey: string;
    createdAt: number;
};
export declare function getOrCreateGatewayIdentity(now?: number): GatewayIdentity;
export declare function signGatewayPayload(payload: string): string;
export declare function getGatewayIdentityPublicKeyRaw(identity?: GatewayIdentity): string;
export declare function clearGatewayIdentityForTest(): void;