import { Result } from '../result';
import { HandlerSync } from '../types/sqnfa';
export declare class EmailBlackListConfiguration {
    /**
     * The information contained within the e-mail will be added to the black list.
     */
    readonly email: string;
    /**
     * The size of the sliding window used when tokenizing the email.
     */
    readonly slidingWindow: number;
    /**
     * A safe-gaurd to ensure that shorter tokens are not added, i.e. ensure that
     * the handler is not too restrictive.
     */
    readonly minTokenLength: number;
    constructor(
    /**
     * The information contained within the e-mail will be added to the black list.
     */
    email: string, 
    /**
     * The size of the sliding window used when tokenizing the email.
     */
    slidingWindow: number, 
    /**
     * A safe-gaurd to ensure that shorter tokens are not added, i.e. ensure that
     * the handler is not too restrictive.
     */
    minTokenLength: number);
}
export declare class EmailBlackListHandler implements HandlerSync {
    readonly name: string;
    private emailTokens;
    /**
     * NIST 800-63B:
     * Password complexity: Users’ password choices are very predictable,
     * so attackers are likely to guess passwords that have been successful
     * in the past. For this reason, it is recommended that passwords chosen
     * by users be compared against a “black list” of unacceptable passwords.
     * This list should include pecific words (such as the name of the service
     * itself) that users are likely to choose.
     *
     * This handler black lists passwords containing parts of the user's e-mail
     * address. The e-mail is tokenized and each token is added to the black list.
     */
    constructor(config: EmailBlackListConfiguration);
    handleSync(password: string): Result;
    /**
     * Adds information about the e-mail. The e-mail is tokenized and each token
     * is added to the black list.
     *
     * Example: john.doe@example.com
     *
     *   Tokens: john, example
     *   (Note that doe is below minTokenLength)
     *
     * Sliding windows 4:
     *
     *   Tokens: john, example, ohn., hn.d, n.do, .doe, exam, xamp, ampl, mple
     *
     * @param email The e-mail that should be black listed.
     * @param slidingWindowSize If positive non-zero: Adds words of the size provided sliding accross the e-mail.
     * @param minTokenLength A safe-gaurd to not let the black list be too restricted.
     */
    addEmailInformation(email: string, slidingWindowSize: number, minTokenLength: number): void;
    private addSlidingWindowWords;
    private addToken;
}