import { BitArray } from 'sjcl';
/**
 * The authentication data.
 */
export interface AuthResponse {
    authToken: string;
    data: string;
    hash: string;
    'x-csrf-token': string;
}
/**
 * Performs the client authentication steps required by the SCRAM specification.
 */
export declare class ScramAuth {
    #private;
    fetch: typeof fetch;
    /**
     * Construct a new authenticator.
     *
     * @param username The username.
     * @param password The password.
     * @param uri Server URI to authenticate with.
     * @param fetchFunc Alternative fetch function.
     */
    constructor(username: string, password: string, uri: string, fetchFunc: typeof fetch);
    /**
     * Performs the client authentication
     *
     * @returns Optional `authToken` in an Record<string, string>
     */
    authenticate(): Promise<AuthResponse>;
    /**
     * Sends the 'hello' handshake message
     * @returns Record<string, string> or error
     */
    hello(): Promise<Record<string, string>>;
    /**
     * Performs the SCRAM authentication logic.
     *
     * @param headers The HTTP handshake response headers from the server
     */
    scram(headers: Record<string, string>): Promise<Record<string, string>>;
    clientFirstMessage(handshakeToken: string): Promise<{
        clientFinal: string;
        saltedPassword: BitArray;
        authMessage: string;
    }>;
    clientFinalMessage(clientFinal: string, handshakeToken: string): Promise<Record<string, string>>;
    validateFinalResponse(finalAuthResponse: Record<string, string>, saltedPassword: BitArray, authMessage: string): void;
    generateClientNonce(): string;
    xor(key: BitArray, sig: BitArray): BitArray;
    parseAuthHeaders(header: string): Record<string, string>;
}