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utils.js

module.exports = {
	bufferSplit: bufferSplit,
	addRSAMissing: addRSAMissing,
	calculateDSAPublic: calculateDSAPublic,
	mpNormalize: mpNormalize,
	ecNormalize: ecNormalize,
	countZeros: countZeros,
	assertCompatible: assertCompatible,
	isCompatible: isCompatible,
	opensslKeyDeriv: opensslKeyDeriv,
	opensshCipherInfo: opensshCipherInfo
};

var assert = require('assert-plus');
var PrivateKey = require('./private-key');
var crypto = require('crypto');

var MAX_CLASS_DEPTH = 3;

function isCompatible(obj, klass, needVer) {
	if (obj === null || typeof (obj) !== 'object')
		return (false);
	if (needVer === undefined)
		needVer = klass.prototype._sshpkApiVersion;
	if (obj instanceof klass &&
	    klass.prototype._sshpkApiVersion[0] == needVer[0])
		return (true);
	var proto = Object.getPrototypeOf(obj);
	var depth = 0;
	while (proto.constructor.name !== klass.name) {
		proto = Object.getPrototypeOf(proto);
		if (!proto || ++depth > MAX_CLASS_DEPTH)
			return (false);
	}
	if (proto.constructor.name !== klass.name)
		return (false);
	var ver = proto._sshpkApiVersion;
	if (ver === undefined)
		ver = klass._oldVersionDetect(obj);
	if (ver[0] != needVer[0] || ver[1] < needVer[1])
		return (false);
	return (true);
}

function assertCompatible(obj, klass, needVer, name) {
	if (name === undefined)
		name = 'object';
	assert.ok(obj, name + ' must not be null');
	assert.object(obj, name + ' must be an object');
	if (needVer === undefined)
		needVer = klass.prototype._sshpkApiVersion;
	if (obj instanceof klass &&
	    klass.prototype._sshpkApiVersion[0] == needVer[0])
		return;
	var proto = Object.getPrototypeOf(obj);
	var depth = 0;
	while (proto.constructor.name !== klass.name) {
		proto = Object.getPrototypeOf(proto);
		assert.ok(proto && ++depth <= MAX_CLASS_DEPTH,
		    name + ' must be a ' + klass.name + ' instance');
	}
	assert.strictEqual(proto.constructor.name, klass.name,
	    name + ' must be a ' + klass.name + ' instance');
	var ver = proto._sshpkApiVersion;
	if (ver === undefined)
		ver = klass._oldVersionDetect(obj);
	assert.ok(ver[0] == needVer[0] && ver[1] >= needVer[1],
	    name + ' must be compatible with ' + klass.name + ' klass ' +
	    'version ' + needVer[0] + '.' + needVer[1]);
}

var CIPHER_LEN = {
	'des-ede3-cbc': { key: 7, iv: 8 },
	'aes-128-cbc': { key: 16, iv: 16 }
};
var PKCS5_SALT_LEN = 8;

function opensslKeyDeriv(cipher, salt, passphrase, count) {
	assert.buffer(salt, 'salt');
	assert.buffer(passphrase, 'passphrase');
	assert.number(count, 'iteration count');

var clen = CIPHER_LEN[cipher];
	assert.object(clen, 'supported cipher');

salt = salt.slice(0, PKCS5_SALT_LEN);

var D, D_prev, bufs;
	var material = new Buffer(0);
	while (material.length < clen.key + clen.iv) {
		bufs = [];
		if (D_prev)
			bufs.push(D_prev);
		bufs.push(passphrase);
		bufs.push(salt);
		D = Buffer.concat(bufs);
		for (var j = 0; j < count; ++j)
			D = crypto.createHash('md5').update(D).digest();
		material = Buffer.concat([material, D]);
		D_prev = D;
	}

return ({
	    key: material.slice(0, clen.key),
	    iv: material.slice(clen.key, clen.key + clen.iv)
	});
}

/* Count leading zero bits on a buffer */
function countZeros(buf) {
	var o = 0, obit = 8;
	while (o < buf.length) {
		var mask = (1 << obit);
		if ((buf[o] & mask) === mask)
			break;
		obit--;
		if (obit < 0) {
			o++;
			obit = 8;
		}
	}
	return (o*8 + (8 - obit) - 1);
}

function bufferSplit(buf, chr) {
	assert.buffer(buf);
	assert.string(chr);

var parts = [];
	var lastPart = 0;
	var matches = 0;
	for (var i = 0; i < buf.length; ++i) {
		if (buf[i] === chr.charCodeAt(matches))
			++matches;
		else if (buf[i] === chr.charCodeAt(0))
			matches = 1;
		else
			matches = 0;

if (matches >= chr.length) {
			var newPart = i + 1;
			parts.push(buf.slice(lastPart, newPart - matches));
			lastPart = newPart;
			matches = 0;
		}
	}
	if (lastPart <= buf.length)
		parts.push(buf.slice(lastPart, buf.length));

return (parts);
}

function mpNormalize(buf) {
	assert.buffer(buf);
	while (buf.length > 1 && buf[0] === 0x00 && (buf[1] & 0x80) === 0x00)
		buf = buf.slice(1);
	if ((buf[0] & 0x80) === 0x80) {
		var b = new Buffer(buf.length + 1);
		b[0] = 0x00;
		buf.copy(b, 1);
		buf = b;
	}
	return (buf);
}

function bigintToMpBuf(bigint) {
	var buf = new Buffer(bigint.toByteArray());
	buf = mpNormalize(buf);
	return (buf);
}

function addRSAMissing(key) {
	assert.object(key);
	assertCompatible(key, PrivateKey, [1, 1]);
	try {
		var bigInt = require('jsbn').BigInteger;
	} catch (e) {
		throw (new Error('To write a PEM private key from ' +
		    'this source, the node jsbn lib is required.'));
	}

var d = new bigInt(key.part.d.data);
	var buf;

if (!key.part.dmodp) {
		var p = new bigInt(key.part.p.data);
		var dmodp = d.mod(p.subtract(1));

buf = bigintToMpBuf(dmodp);
		key.part.dmodp = {name: 'dmodp', data: buf};
		key.parts.push(key.part.dmodp);
	}
	if (!key.part.dmodq) {
		var q = new bigInt(key.part.q.data);
		var dmodq = d.mod(q.subtract(1));

buf = bigintToMpBuf(dmodq);
		key.part.dmodq = {name: 'dmodq', data: buf};
		key.parts.push(key.part.dmodq);
	}
}

	: Add Folder
	: Add File
	: Edit File
	: Rename
	: Chmod
	: Delete

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2021-11-10 09:12:37	Buat Folder Buat File Info
..	dir	-	0755	2021-11-10 09:12:37
formats	dir	-	0755	2021-11-10 09:12:37	rename chmod hapus
algs.js	text/plain	4.73 KB	0644	2015-11-07 01:35:44	edit rename chmod hapus
certificate.js	text/plain	10.47 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
dhe.js	text/plain	8.12 KB	0644	2015-12-01 10:25:23	edit rename chmod hapus
ed-compat.js	text/plain	2.28 KB	0644	2016-01-12 03:25:17	edit rename chmod hapus
errors.js	text/plain	2.71 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
fingerprint.js	text/plain	3.86 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
identity.js	text/plain	7.24 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
index.js	text/plain	1.17 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
key.js	text/plain	7.15 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
private-key.js	text/plain	5.9 KB	0644	2016-04-30 12:23:03	edit rename chmod hapus
signature.js	text/plain	6.17 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
ssh-buffer.js	text/plain	3.74 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus
utils.js	text/plain	6.9 KB	0644	2017-03-02 03:21:55	edit rename chmod hapus