/// <reference types="node" />
import { SRPParams } from './SRPParams';
export declare type SRPKeyPair = {
    secretKey: Buffer;
    publicKey: Buffer;
};
export declare type SRPSession = {
    sessionKey: Buffer;
    serverProof: Buffer;
    clientProof: Buffer;
};
export declare class SRP {
    private readonly _engine;
    constructor(params: SRPParams);
    /**
     * Generate User Salt
     * @param length Length of salt. Default is 16.
     */
    generateSalt(length?: number): Buffer;
    /**
     * Compute private key for a user
     * @param username Username
     * @param password Password
     * @param salt User's salt
     */
    computePrivateKey(username: string, password: string, salt: Buffer): Buffer;
    /**
     * Compute verifier for a user
     * @param username Username
     * @param password Password
     * @param salt User's salt
     */
    computeVerifier(username: string, password: string, salt: Buffer): Buffer;
    /**
     * Generate Client Ephemeral Key
     */
    generateClientEphemeralKey(): SRPKeyPair;
    /**
     * Generate Server Ephemeral Key
     * @param verifier User's verifier
     */
    generateServerEphemeralKey(verifier: Buffer): SRPKeyPair;
    /**
     * Compute client session
     * @param key Client KeyPair
     * @param serverPublicKey Server Public Key
     * @param username Username
     * @param salt User's salt
     * @param privateKey User's private key
     * @returns Client Session or Null if something went wrong
     */
    computeClientSession(key: SRPKeyPair, serverPublicKey: Buffer, username: string, salt: Buffer, privateKey: Buffer): SRPSession | null;
    computeServerSession(key: SRPKeyPair, clientPublicKey: Buffer, username: string, verifier: Buffer, salt: Buffer): SRPSession | null;
}