/**
 * Generate a cryptographically secure random token for verification or password reset.
 * Returns a 64-character hexadecimal string (32 bytes).
 */
export declare function generateSecureToken(): string;
/**
 * Calculate token expiry time from now.
 * @param hours - Number of hours until expiry
 * @returns ISO 8601 timestamp string
 */
export declare function getTokenExpiry(hours: number): string;
/**
 * Check if a token has expired.
 * @param expiryTimestamp - ISO 8601 timestamp string
 * @returns true if expired, false otherwise
 */
export declare function isTokenExpired(expiryTimestamp: string): boolean;
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