import type { AgentMessage } from "@mariozechner/pi-agent-core";
export interface HashedLogEntry<T = any> {
    timestamp: string | number;
    data: T;
    hash: string;
    previousHash?: string;
}
export type AgentMessageWithHash = AgentMessage & {
    hash?: string;
};
/**
 * Compute SHA-256 hash of JSON.stringify(data) + timestamp
 */
export declare function computeHash(data: any, timestamp: string | number): string;
/**
 * Create a SHA-256 hash of the log entry data and timestamp
 */
export declare function hashLogEntry<T>(data: T, timestamp?: string | number): HashedLogEntry<T>;
/**
 * Verify the integrity of a hashed log entry
 */
export declare function verifyLogIntegrity<T>(entry: HashedLogEntry<T>): boolean;
/**
 * Hash a message object (AgentMessage) for log integrity
 */
export declare function hashMessage(message: Record<string, unknown>): string;
/**
 * Add integrity hash to an AgentMessage, returning a new message with hash property.
 * If the message already has a hash, it is returned unchanged.
 */
export declare function addHashToMessage(message: AgentMessage): AgentMessageWithHash;