dynatrace-cordova-outsystems-plugin/node_modules/sshpk/lib/formats/auto.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

// Copyright 2018 Joyent, Inc.

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 putty = require('./putty');

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

function read(buf, options) {
	if (typeof (buf) === 'string') {
		if (buf.trim().match(/^[-]+[ ]*BEGIN/))
			return (pem.read(buf, options));
		if (buf.match(/^\s*ssh-[a-z]/))
			return (ssh.read(buf, options));
		if (buf.match(/^\s*ecdsa-/))
			return (ssh.read(buf, options));
		if (buf.match(/^putty-user-key-file-2:/i))
			return (putty.read(buf, options));
		if (findDNSSECHeader(buf))
			return (dnssec.read(buf, options));
		buf = Buffer.from(buf, 'binary');
	} else {
		assert.buffer(buf);
		if (findPEMHeader(buf))
			return (pem.read(buf, options));
		if (findSSHHeader(buf))
			return (ssh.read(buf, options));
		if (findPuTTYHeader(buf))
			return (putty.read(buf, options));
		if (findDNSSECHeader(buf))
			return (dnssec.read(buf, options));
	}
	if (buf.readUInt32BE(0) < buf.length)
		return (rfc4253.read(buf, options));
	throw (new Error('Failed to auto-detect format of key'));
}

function findPuTTYHeader(buf) {
	var offset = 0;
	while (offset < buf.length &&
	    (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))
		++offset;
	if (offset + 22 <= buf.length &&
	    buf.slice(offset, offset + 22).toString('ascii').toLowerCase() ===
	    'putty-user-key-file-2:')
		return (true);
	return (false);
}

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'));
}