dynatrace-cordova-outsystems-plugin/node_modules/sshpk/lib/formats/putty.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 rfc4253 = require('./rfc4253');
var Key = require('../key');

var errors = require('../errors');

function read(buf, options) {
	var lines = buf.toString('ascii').split(/[\r\n]+/);
	var found = false;
	var parts;
	var si = 0;
	while (si < lines.length) {
		parts = splitHeader(lines[si++]);
		if (parts &&
		    parts[0].toLowerCase() === 'putty-user-key-file-2') {
			found = true;
			break;
		}
	}
	if (!found) {
		throw (new Error('No PuTTY format first line found'));
	}
	var alg = parts[1];

	parts = splitHeader(lines[si++]);
	assert.equal(parts[0].toLowerCase(), 'encryption');

	parts = splitHeader(lines[si++]);
	assert.equal(parts[0].toLowerCase(), 'comment');
	var comment = parts[1];

	parts = splitHeader(lines[si++]);
	assert.equal(parts[0].toLowerCase(), 'public-lines');
	var publicLines = parseInt(parts[1], 10);
	if (!isFinite(publicLines) || publicLines < 0 ||
	    publicLines > lines.length) {
		throw (new Error('Invalid public-lines count'));
	}

	var publicBuf = Buffer.from(
	    lines.slice(si, si + publicLines).join(''), 'base64');
	var keyType = rfc4253.algToKeyType(alg);
	var key = rfc4253.read(publicBuf);
	if (key.type !== keyType) {
		throw (new Error('Outer key algorithm mismatch'));
	}
	key.comment = comment;
	return (key);
}

function splitHeader(line) {
	var idx = line.indexOf(':');
	if (idx === -1)
		return (null);
	var header = line.slice(0, idx);
	++idx;
	while (line[idx] === ' ')
		++idx;
	var rest = line.slice(idx);
	return ([header, rest]);
}

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

	var alg = rfc4253.keyTypeToAlg(key);
	var buf = rfc4253.write(key);
	var comment = key.comment || '';

	var b64 = buf.toString('base64');
	var lines = wrap(b64, 64);

	lines.unshift('Public-Lines: ' + lines.length);
	lines.unshift('Comment: ' + comment);
	lines.unshift('Encryption: none');
	lines.unshift('PuTTY-User-Key-File-2: ' + alg);

	return (Buffer.from(lines.join('\n') + '\n'));
}

function wrap(txt, len) {
	var lines = [];
	var pos = 0;
	while (pos < txt.length) {
		lines.push(txt.slice(pos, pos + 64));
		pos += 64;
	}
	return (lines);
}