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dnssec.js

module.exports = {
	read: read,
	write: write
};

var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var Key = require('../key');
var PrivateKey = require('../private-key');
var utils = require('../utils');
var SSHBuffer = require('../ssh-buffer');
var Dhe = require('../dhe');

var supportedAlgos = {
	'rsa-sha1' : 5,
	'rsa-sha256' : 8,
	'rsa-sha512' : 10,
	'ecdsa-p256-sha256' : 13,
	'ecdsa-p384-sha384' : 14
	/*
	 * ed25519 is hypothetically supported with id 15
	 * but the common tools available don't appear to be
	 * capable of generating/using ed25519 keys
	 */
};

var supportedAlgosById = {};
Object.keys(supportedAlgos).forEach(function (k) {
	supportedAlgosById[supportedAlgos[k]] = k.toUpperCase();
});

function read(buf, options) {
	if (typeof (buf) !== 'string') {
		assert.buffer(buf, 'buf');
		buf = buf.toString('ascii');
	}
	var lines = buf.split('\n');
	if (lines[0].match(/^Private-key-format\: v1/)) {
		var algElems = lines[1].split(' ');
		var algoNum = parseInt(algElems[1], 10);
		var algoName = algElems[2];
		if (!supportedAlgosById[algoNum])
			throw (new Error('Unsupported algorithm: ' + algoName));
		return (readDNSSECPrivateKey(algoNum, lines.slice(2)));
	}

// skip any comment-lines
	var line = 0;
	/* JSSTYLED */
	while (lines[line].match(/^\;/))
		line++;
	// we should now have *one single* line left with our KEY on it.
	if ((lines[line].match(/\. IN KEY /) ||
	    lines[line].match(/\. IN DNSKEY /)) && lines[line+1].length === 0) {
		return (readRFC3110(lines[line]));
	}
	throw (new Error('Cannot parse dnssec key'));
}

function readRFC3110(keyString) {
	var elems = keyString.split(' ');
	//unused var flags = parseInt(elems[3], 10);
	//unused var protocol = parseInt(elems[4], 10);
	var algorithm = parseInt(elems[5], 10);
	if (!supportedAlgosById[algorithm])
		throw (new Error('Unsupported algorithm: ' + algorithm));
	var base64key = elems.slice(6, elems.length).join();
	var keyBuffer = Buffer.from(base64key, 'base64');
	if (supportedAlgosById[algorithm].match(/^RSA-/)) {
		// join the rest of the body into a single base64-blob
		var publicExponentLen = keyBuffer.readUInt8(0);
		if (publicExponentLen != 3 && publicExponentLen != 1)
			throw (new Error('Cannot parse dnssec key: ' +
			    'unsupported exponent length'));

function elementToBuf(e) {
	return (Buffer.from(e.split(' ')[1], 'base64'));
}

function dnssecTimestamp(date) {
	var year = date.getFullYear() + ''; //stringify
	var month = (date.getMonth() + 1);
	var timestampStr = year + month + date.getUTCDate();
	timestampStr += '' + date.getUTCHours() + date.getUTCMinutes();
	timestampStr += date.getUTCSeconds();
	return (timestampStr);
}

function rsaAlgFromOptions(opts) {
	if (!opts || !opts.hashAlgo || opts.hashAlgo === 'sha1')
		return ('5 (RSASHA1)');
	else if (opts.hashAlgo === 'sha256')
		return ('8 (RSASHA256)');
	else if (opts.hashAlgo === 'sha512')
		return ('10 (RSASHA512)');
	else
		throw (new Error('Unknown or unsupported hash: ' +
		    opts.hashAlgo));
}

function writeRSA(key, options) {
	// if we're missing parts, add them.
	if (!key.part.dmodp || !key.part.dmodq) {
		utils.addRSAMissing(key);
	}

var out = '';
	out += 'Private-key-format: v1.3\n';
	out += 'Algorithm: ' + rsaAlgFromOptions(options) + '\n';
	var n = utils.mpDenormalize(key.part['n'].data);
	out += 'Modulus: ' + n.toString('base64') + '\n';
	var e = utils.mpDenormalize(key.part['e'].data);
	out += 'PublicExponent: ' + e.toString('base64') + '\n';
	var d = utils.mpDenormalize(key.part['d'].data);
	out += 'PrivateExponent: ' + d.toString('base64') + '\n';
	var p = utils.mpDenormalize(key.part['p'].data);
	out += 'Prime1: ' + p.toString('base64') + '\n';
	var q = utils.mpDenormalize(key.part['q'].data);
	out += 'Prime2: ' + q.toString('base64') + '\n';
	var dmodp = utils.mpDenormalize(key.part['dmodp'].data);
	out += 'Exponent1: ' + dmodp.toString('base64') + '\n';
	var dmodq = utils.mpDenormalize(key.part['dmodq'].data);
	out += 'Exponent2: ' + dmodq.toString('base64') + '\n';
	var iqmp = utils.mpDenormalize(key.part['iqmp'].data);
	out += 'Coefficient: ' + iqmp.toString('base64') + '\n';
	// Assume that we're valid as-of now
	var timestamp = new Date();
	out += 'Created: ' + dnssecTimestamp(timestamp) + '\n';
	out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n';
	out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n';
	return (Buffer.from(out, 'ascii'));
}

function writeECDSA(key, options) {
	var out = '';
	out += 'Private-key-format: v1.3\n';

if (key.curve === 'nistp256') {
		out += 'Algorithm: 13 (ECDSAP256SHA256)\n';
	} else if (key.curve === 'nistp384') {
		out += 'Algorithm: 14 (ECDSAP384SHA384)\n';
	} else {
		throw (new Error('Unsupported curve'));
	}
	var base64Key = key.part['d'].data.toString('base64');
	out += 'PrivateKey: ' + base64Key + '\n';

// Assume that we're valid as-of now
	var timestamp = new Date();
	out += 'Created: ' + dnssecTimestamp(timestamp) + '\n';
	out += 'Publish: ' + dnssecTimestamp(timestamp) + '\n';
	out += 'Activate: ' + dnssecTimestamp(timestamp) + '\n';

return (Buffer.from(out, 'ascii'));
}

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