/// <reference types="node" />
import { Buffer } from 'buffer';
import { BigInt } from './bigInt';
export declare const enum DerType {
    Integer = 2,
    BitString = 3,
    OctetString = 4,
    Null = 5,
    ObjectIdentifier = 6,
    Sequence = 16,
    Set = 17,
    Constructed = 32,
    Tagged = 160
}
/**
 * Reads data in DER (Distinguished Encoding Rules) format.
 *
 * Enables importing and exporting key files, which are commonly DER-encoded.
 */
export declare class DerReader {
    private readonly buffer;
    private position;
    constructor(buffer: Buffer, dataType?: DerType);
    get available(): number;
    readNull(): void;
    readInteger(): BigInt;
    readOctetString(): Buffer;
    readBitString(): Buffer;
    readObjectIdentifier(expected?: string): string;
    readSequence(): DerReader;
    tryReadTagged(tagId: number): DerReader | null;
    /** Reads the type of the next value in the sequence WITHOUT advancing the reader position. */
    peek(): DerType;
    private readLength;
    private readByte;
    private readBytes;
    private readType;
}
/**
 * Writes data in DER (Distinguished Encoding Rules) format.
 *
 * Enables importing and exporting key files, which are commonly DER-encoded.
 */
export declare class DerWriter {
    private buffer;
    private readonly dataType;
    private static lengthBuffer;
    private position;
    constructor(buffer: Buffer, dataType?: DerType);
    toBuffer(): Buffer;
    writeSequence(data: DerWriter): void;
    writeTagged(tagId: number, data: DerWriter): void;
    writeNull(): void;
    writeInteger(value: BigInt): void;
    writeOctetString(data: Buffer): void;
    writeBitString(data: Buffer): void;
    writeObjectIdentifier(oid: string): void;
    private static getLength;
    private writeByte;
    private writeBytes;
    private ensureCapacity;
}
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