export interface AuditLogEntry {
    timestamp: string;
    sessionId: string;
    action: string;
    command?: string;
    riskLevel: 'low' | 'medium' | 'high' | 'critical';
    success: boolean;
    error?: string;
    executionTime: number;
    sourceIP?: string;
    userAgent?: string;
}
export interface SecurityMetrics {
    totalRequests: number;
    blockedRequests: number;
    highRiskRequests: number;
    criticalRiskRequests: number;
    averageExecutionTime: number;
    topCommands: {
        command: string;
        count: number;
    }[];
    errorRate: number;
}
export declare class SecurityLogger {
    private logDir;
    private encryptionKey;
    constructor(logDir?: string);
    logSecurityEvent(entry: AuditLogEntry): Promise<void>;
    getSecurityMetrics(since?: Date): Promise<SecurityMetrics>;
    searchLogs(criteria: {
        action?: string;
        riskLevel?: string;
        since?: Date;
        until?: Date;
        limit?: number;
    }): Promise<AuditLogEntry[]>;
    private ensureLogDirectory;
    private getOrCreateEncryptionKey;
    private encryptLogEntry;
    private encryptString;
    private decryptString;
    private getLogFilePath;
    private getLogLevel;
    private readLogEntries;
    private decryptLogEntry;
}
export declare const securityLogger: SecurityLogger;