dynatrace-cordova-outsystems-plugin/node_modules/sshpk/lib/formats/ssh.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 2015 Joyent, Inc.

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

var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var rfc4253 = require('./rfc4253');
var utils = require('../utils');
var Key = require('../key');
var PrivateKey = require('../private-key');

var sshpriv = require('./ssh-private');

/*JSSTYLED*/
var SSHKEY_RE = /^([a-z0-9-]+)[ \t]+([a-zA-Z0-9+\/]+[=]*)([ \t]+([^ \t][^\n]*[\n]*)?)?$/;
/*JSSTYLED*/
var SSHKEY_RE2 = /^([a-z0-9-]+)[ \t\n]+([a-zA-Z0-9+\/][a-zA-Z0-9+\/ \t\n=]*)([^a-zA-Z0-9+\/ \t\n=].*)?$/;

function read(buf, options) {
	if (typeof (buf) !== 'string') {
		assert.buffer(buf, 'buf');
		buf = buf.toString('ascii');
	}

	var trimmed = buf.trim().replace(/[\\\r]/g, '');
	var m = trimmed.match(SSHKEY_RE);
	if (!m)
		m = trimmed.match(SSHKEY_RE2);
	assert.ok(m, 'key must match regex');

	var type = rfc4253.algToKeyType(m[1]);
	var kbuf = Buffer.from(m[2], 'base64');

	/*
	 * This is a bit tricky. If we managed to parse the key and locate the
	 * key comment with the regex, then do a non-partial read and assert
	 * that we have consumed all bytes. If we couldn't locate the key
	 * comment, though, there may be whitespace shenanigans going on that
	 * have conjoined the comment to the rest of the key. We do a partial
	 * read in this case to try to make the best out of a sorry situation.
	 */
	var key;
	var ret = {};
	if (m[4]) {
		try {
			key = rfc4253.read(kbuf);

		} catch (e) {
			m = trimmed.match(SSHKEY_RE2);
			assert.ok(m, 'key must match regex');
			kbuf = Buffer.from(m[2], 'base64');
			key = rfc4253.readInternal(ret, 'public', kbuf);
		}
	} else {
		key = rfc4253.readInternal(ret, 'public', kbuf);
	}

	assert.strictEqual(type, key.type);

	if (m[4] && m[4].length > 0) {
		key.comment = m[4];

	} else if (ret.consumed) {
		/*
		 * Now the magic: trying to recover the key comment when it's
		 * gotten conjoined to the key or otherwise shenanigan'd.
		 *
		 * Work out how much base64 we used, then drop all non-base64
		 * chars from the beginning up to this point in the the string.
		 * Then offset in this and try to make up for missing = chars.
		 */
		var data = m[2] + (m[3] ? m[3] : '');
		var realOffset = Math.ceil(ret.consumed / 3) * 4;
		data = data.slice(0, realOffset - 2). /*JSSTYLED*/
		    replace(/[^a-zA-Z0-9+\/=]/g, '') +
		    data.slice(realOffset - 2);

		var padding = ret.consumed % 3;
		if (padding > 0 &&
		    data.slice(realOffset - 1, realOffset) !== '=')
			realOffset--;
		while (data.slice(realOffset, realOffset + 1) === '=')
			realOffset++;

		/* Finally, grab what we think is the comment & clean it up. */
		var trailer = data.slice(realOffset);
		trailer = trailer.replace(/[\r\n]/g, ' ').
		    replace(/^\s+/, '');
		if (trailer.match(/^[a-zA-Z0-9]/))
			key.comment = trailer;
	}

	return (key);
}

function write(key, options) {
	assert.object(key);
	if (!Key.isKey(key))
		throw (new Error('Must be a public key'));

	var parts = [];
	var alg = rfc4253.keyTypeToAlg(key);
	parts.push(alg);

	var buf = rfc4253.write(key);
	parts.push(buf.toString('base64'));

	if (key.comment)
		parts.push(key.comment);

	return (Buffer.from(parts.join(' ')));
}