import { CancellationToken, Disposable } from 'vscode-jsonrpc';
import { Stream } from '../streams';
import { KeyExchangeService } from '../services/keyExchangeService';
import { SshMessage } from '../messages/sshMessage';
import { SessionMetrics } from '../metrics/sessionMetrics';
import { SshSessionAlgorithms } from '../sshSessionAlgorithms';
import { SshSessionConfiguration } from '../sshSessionConfiguration';
import { Trace } from '../trace';
/**
 * Implements the base SSH protocol (sending and receiving messages) over a Stream.
 */
export declare class SshProtocol implements Disposable {
    private readonly config;
    private readonly metrics;
    private readonly trace;
    private static readonly maxPacketLength;
    private static readonly packetLengthSize;
    private static readonly paddingLengthSize;
    private stream;
    private readonly sessionSemaphore;
    private inboundPacketSequence;
    private outboundPacketSequence;
    private inboundFlow;
    private outboundFlow;
    private lastIncomingTimestamp;
    private readonly recentSentMessages;
    private readonly sendWriter;
    private readonly receiveWriter;
    constructor(stream: Stream, config: SshSessionConfiguration, metrics: SessionMetrics, trace: Trace);
    extensions: Map<string, string> | null;
    kexService: KeyExchangeService | null;
    algorithms: SshSessionAlgorithms | null;
    messageContext: string | null;
    outgoingMessagesHaveLatencyInfo: boolean;
    incomingMessagesHaveLatencyInfo: boolean;
    outgoingMessagesHaveReconnectInfo: boolean;
    incomingMessagesHaveReconnectInfo: boolean;
    get lastIncomingSequence(): number;
    getSentMessages(startingSequenceNumber: number): SshMessage[] | null;
    writeProtocolVersion(version: string, cancellation?: CancellationToken): Promise<void>;
    readProtocolVersion(cancellation?: CancellationToken): Promise<string>;
    handleNewKeys(cancellation?: CancellationToken): Promise<void>;
    /**
     * Attempts to read from the stream until the buffer is full.
     * @returns True if the read succeeded, false if the stream was disposed.
     */
    private read;
    /**
     * Attempts to write data to the stream.
     * @returns True if the write succeeded, false if the stream was disposed.
     */
    private write;
    considerReExchange(initial: boolean, cancellation?: CancellationToken): Promise<void>;
    private computeHmac;
    private verifyHmac;
    private readAndVerifyHmac;
    /**
     * Attemps to write one message to the stream.
     * @returns `true` if writing succeeded, `false` if the stream was disposed.
     * @throws SshConnectionException if writing to the stream failed for any other reason.
     */
    sendMessage(message: SshMessage, cancellation?: CancellationToken): Promise<boolean>;
    /**
     * Attemps to read one message from the stream.
     * @returns The message, or `null` if the stream was disposed.
     * @throws SshConnectionError if reading from the stream failed for any other reason.
     */
    receiveMessage(cancellation?: CancellationToken): Promise<SshMessage | null>;
    dispose(): void;
}
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