dns-packet-typescript/dist/rrrsig.js

An abstract-encoding compliant module for encoding / decoding DNS packets

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodingLength = exports.decode = exports.encode = void 0;
var types = require("./types");
var name = require("./name");
function encode(sig, buf, offset) {
    if (offset === void 0) { offset = 0; }
    if (!buf) {
        buf = Buffer.allocUnsafe(encodingLength(sig));
    }
    if (!offset) {
        offset = 0;
    }
    var oldOffset = offset;
    var signature = sig.signature;
    if (!Buffer.isBuffer(signature)) {
        throw new Error('Signature must be a Buffer');
    }
    offset += 2; // Leave space for length
    buf.writeUInt16BE(types.toType(sig.typeCovered), offset);
    offset += 2;
    buf.writeUInt8(sig.algorithm, offset);
    offset += 1;
    buf.writeUInt8(sig.labels, offset);
    offset += 1;
    buf.writeUInt32BE(sig.originalTTL, offset);
    offset += 4;
    buf.writeUInt32BE(sig.expiration, offset);
    offset += 4;
    buf.writeUInt32BE(sig.inception, offset);
    offset += 4;
    buf.writeUInt16BE(sig.keyTag, offset);
    offset += 2;
    name.encode(sig.signersName, buf, offset);
    offset += name.encode.bytes;
    signature.copy(buf, offset, 0, signature.length);
    offset += signature.length;
    encode.bytes = offset - oldOffset;
    buf.writeUInt16BE(encode.bytes - 2, oldOffset);
    return buf;
}
exports.encode = encode;
encode.bytes = 0;
function decode(buf, offset) {
    if (offset === void 0) { offset = 0; }
    if (!offset) {
        offset = 0;
    }
    var oldOffset = offset;
    var sig = {};
    var length = buf.readUInt16BE(offset);
    offset += 2;
    sig.typeCovered = types.toString(buf.readUInt16BE(offset));
    offset += 2;
    sig.algorithm = buf.readUInt8(offset);
    offset += 1;
    sig.labels = buf.readUInt8(offset);
    offset += 1;
    sig.originalTTL = buf.readUInt32BE(offset);
    offset += 4;
    sig.expiration = buf.readUInt32BE(offset);
    offset += 4;
    sig.inception = buf.readUInt32BE(offset);
    offset += 4;
    sig.keyTag = buf.readUInt16BE(offset);
    offset += 2;
    sig.signersName = name.decode(buf, offset);
    offset += name.decode.bytes;
    sig.signature = buf.slice(offset, oldOffset + length + 2);
    offset += sig.signature.length;
    decode.bytes = offset - oldOffset;
    return sig;
}
exports.decode = decode;
decode.bytes = 0;
function encodingLength(sig) {
    return 20 +
        name.encodingLength(sig.signersName) +
        Buffer.byteLength(sig.signature);
}
exports.encodingLength = encodingLength;
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