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✏️ Editing: auto.js

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

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

var pem = require('./pem');
var ssh = require('./ssh');
var rfc4253 = require('./rfc4253');
var dnssec = require('./dnssec');

var DNSSEC_PRIVKEY_HEADER_PREFIX = 'Private-key-format: v1';

function findSSHHeader(buf) {
	var offset = 0;
	while (offset < buf.length &&
	    (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))
		++offset;
	if (offset + 4 <= buf.length &&
	    buf.slice(offset, offset + 4).toString('ascii') === 'ssh-')
		return (true);
	if (offset + 6 <= buf.length &&
	    buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-')
		return (true);
	return (false);
}

function findPEMHeader(buf) {
	var offset = 0;
	while (offset < buf.length &&
	    (buf[offset] === 32 || buf[offset] === 10))
		++offset;
	if (buf[offset] !== 45)
		return (false);
	while (offset < buf.length &&
	    (buf[offset] === 45))
		++offset;
	while (offset < buf.length &&
	    (buf[offset] === 32))
		++offset;
	if (offset + 5 > buf.length ||
	    buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN')
		return (false);
	return (true);
}

function findDNSSECHeader(buf) {
	// private case first
	if (buf.length <= DNSSEC_PRIVKEY_HEADER_PREFIX.length)
		return (false);
	var headerCheck = buf.slice(0, DNSSEC_PRIVKEY_HEADER_PREFIX.length);
	if (headerCheck.toString('ascii') === DNSSEC_PRIVKEY_HEADER_PREFIX)
		return (true);

// public-key RFC3110 ?
	// 'domain.com. IN KEY ...' or 'domain.com. IN DNSKEY ...'
	// skip any comment-lines
	if (typeof (buf) !== 'string') {
		buf = buf.toString('ascii');
	}
	var lines = buf.split('\n');
	var line = 0;
	/* JSSTYLED */
	while (lines[line].match(/^\;/))
		line++;
	if (lines[line].toString('ascii').match(/\. IN KEY /))
		return (true);
	if (lines[line].toString('ascii').match(/\. IN DNSKEY /))
		return (true);
	return (false);
}

function write(key, options) {
	throw (new Error('"auto" format cannot be used for writing'));
}

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