/**
 * Authentication Middleware
 *
 * Provides API key authentication for the MCP server.
 * Supports both X-API-Key header and Bearer token authentication.
 */
import type { Request, Response, NextFunction } from 'express';
/**
 * Authentication configuration
 */
export interface AuthConfig {
    /** API keys that are allowed to access the server (hashed for security) */
    apiKeys: string[];
    /** Endpoints that don't require authentication */
    publicEndpoints: string[];
    /** Whether authentication is enabled */
    enabled: boolean;
}
/**
 * Default authentication configuration
 */
export declare const DEFAULT_AUTH_CONFIG: AuthConfig;
/**
 * Hash an API key for secure comparison
 */
export declare function hashApiKey(key: string): string;
/**
 * Create authentication middleware
 */
export declare function createAuthMiddleware(config?: Partial<AuthConfig>): (req: Request, res: Response, next: NextFunction) => void;
/**
 * Load API keys from environment variable
 * Supports comma-separated list of keys
 */
export declare function loadApiKeysFromEnv(): string[];
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