/**
 * @file der.ts
 * @description Minimal ASN.1 DER encoder/decoder for X.509 certificate generation.
 * @module crypto/der
 *
 * Implements just enough of ITU-T X.690 DER to build and read the structures
 * WebRTC needs: self-signed ECDSA certificates and SubjectPublicKeyInfo.
 *
 * All encoders return Buffers. The TLV length is always encoded in the
 * minimal (definite, shortest-form) representation required by DER.
 */
export declare const TAG: Readonly<{
    BOOLEAN: 1;
    INTEGER: 2;
    BIT_STRING: 3;
    OCTET_STRING: 4;
    NULL: 5;
    OID: 6;
    UTF8_STRING: 12;
    PRINTABLE_STRING: 19;
    IA5_STRING: 22;
    UTC_TIME: 23;
    GENERALIZED_TIME: 24;
    SEQUENCE: 48;
    SET: 49;
}>;
/**
 * Encode a DER length in definite, shortest form.
 * @param {number} len
 * @returns {Buffer}
 */
export declare function encodeLength(len: number): Buffer;
/**
 * Wrap a body in a TLV with the given tag.
 * @param {number} tag
 * @param {Buffer} body
 * @returns {Buffer}
 */
export declare function tlv(tag: number, body: Buffer): Buffer;
/**
 * Encode an unsigned big-endian integer (from a Buffer) as a DER INTEGER,
 * adding a leading 0x00 when the high bit is set so it stays positive.
 * @param {Buffer} buf - Big-endian magnitude.
 * @returns {Buffer}
 */
export declare function encodeIntegerFromBuffer(buf: Buffer): Buffer;
/**
 * Encode a small non-negative JS integer as a DER INTEGER.
 * @param {number} value
 * @returns {Buffer}
 */
export declare function encodeInteger(value: number): Buffer;
/**
 * Encode an OBJECT IDENTIFIER from its dotted-decimal string.
 * @param {string} oid - e.g. "1.2.840.10045.2.1"
 * @returns {Buffer}
 */
export declare function encodeOID(oid: string): Buffer;
/**
 * Encode a BIT STRING with zero unused bits.
 * @param {Buffer} data
 * @returns {Buffer}
 */
export declare function encodeBitString(data: Buffer): Buffer;
/**
 * Encode an OCTET STRING.
 * @param {Buffer} data
 * @returns {Buffer}
 */
export declare function encodeOctetString(data: Buffer): Buffer;
/**
 * Encode a SEQUENCE from already-encoded components.
 * @param {Buffer[]} components
 * @returns {Buffer}
 */
export declare function encodeSequence(components: Buffer[]): Buffer;
/**
 * Encode a SET from already-encoded components.
 * @param {Buffer[]} components
 * @returns {Buffer}
 */
export declare function encodeSet(components: Buffer[]): Buffer;
/**
 * Encode NULL.
 * @returns {Buffer}
 */
export declare function encodeNull(): Buffer;
/**
 * Encode a UTF8String.
 * @param {string} str
 * @returns {Buffer}
 */
export declare function encodeUTF8String(str: string): Buffer;
/**
 * Encode a context-specific [n] explicit wrapper (constructed).
 * @param {number} n - context tag number
 * @param {Buffer} body
 * @returns {Buffer}
 */
export declare function encodeExplicit(n: number, body: Buffer): Buffer;
/**
 * Encode an X.509 time. Uses UTCTime for years < 2050, else GeneralizedTime,
 * per RFC 5280 §4.1.2.5.
 * @param {Date} date
 * @returns {Buffer}
 */
export declare function encodeTime(date: Date): Buffer;