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Edit File : utils.js \| Size : 9.38 KB
// Copyright 2015 Joyent, Inc. module.exports = { bufferSplit: bufferSplit, addRSAMissing: addRSAMissing, calculateDSAPublic: calculateDSAPublic, calculateED25519Public: calculateED25519Public, calculateX25519Public: calculateX25519Public, mpNormalize: mpNormalize, mpDenormalize: mpDenormalize, ecNormalize: ecNormalize, countZeros: countZeros, assertCompatible: assertCompatible, isCompatible: isCompatible, opensslKeyDeriv: opensslKeyDeriv, opensshCipherInfo: opensshCipherInfo, publicFromPrivateECDSA: publicFromPrivateECDSA, zeroPadToLength: zeroPadToLength, writeBitString: writeBitString, readBitString: readBitString }; var assert = require('assert-plus'); var Buffer = require('safer-buffer').Buffer; var PrivateKey = require('./private-key'); var Key = require('./key'); var crypto = require('crypto'); var algs = require('./algs'); var asn1 = require('asn1'); var ec, jsbn; var nacl; 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 = Buffer.alloc(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 (o8 + (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 ecNormalize(buf, addZero) { assert.buffer(buf); if (buf[0] === 0x00 && buf[1] === 0x04) { if (addZero) return (buf); return (buf.slice(1)); } else if (buf[0] === 0x04) { if (!addZero) return (buf); } else { while (buf[0] === 0x00) buf = buf.slice(1); if (buf[0] === 0x02 \|\| buf[0] === 0x03) throw (new Error('Compressed elliptic curve points ' + 'are not supported')); if (buf[0] !== 0x04) throw (new Error('Not a valid elliptic curve point')); if (!addZero) return (buf); } var b = Buffer.alloc(buf.length + 1); b[0] = 0x0; buf.copy(b, 1); return (b); } function readBitString(der, tag) { if (tag === undefined) tag = asn1.Ber.BitString; var buf = der.readString(tag, true); assert.strictEqual(buf[0], 0x00, 'bit strings with unused bits are ' + 'not supported (0x' + buf[0].toString(16) + ')'); return (buf.slice(1)); } function writeBitString(der, buf, tag) { if (tag === undefined) tag = asn1.Ber.BitString; var b = Buffer.alloc(buf.length + 1); b[0] = 0x00; buf.copy(b, 1); der.writeBuffer(b, tag); } 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 = Buffer.alloc(buf.length + 1); b[0] = 0x00; buf.copy(b, 1); buf = b; } return (buf); } function mpDenormalize(buf) { assert.buffer(buf); while (buf.length > 1 && buf[0] === 0x00) buf = buf.slice(1); return (buf); } function zeroPadToLength(buf, len) { assert.buffer(buf); assert.number(len); while (buf.length > len) { assert.equal(buf[0], 0x00); buf = buf.slice(1); } while (buf.length < len) { var b = Buffer.alloc(buf.length + 1); b[0] = 0x00; buf.copy(b, 1); buf = b; } return (buf); } function bigintToMpBuf(bigint) { var buf = Buffer.from(bigint.toByteArray()); buf = mpNormalize(buf); return (buf); } function calculateDSAPublic(g, p, x) { assert.buffer(g); assert.buffer(p); assert.buffer(x); try { var bigInt = require('jsbn').BigInteger; } catch (e) { throw (new Error('To load a PKCS#8 format DSA private key, ' + 'the node jsbn library is required.')); } g = new bigInt(g); p = new bigInt(p); x = new bigInt(x); var y = g.modPow(x, p); var ybuf = bigintToMpBuf(y); return (ybuf); } function calculateED25519Public(k) { assert.buffer(k); if (nacl === undefined) nacl = require('tweetnacl'); var kp = nacl.sign.keyPair.fromSeed(new Uint8Array(k)); return (Buffer.from(kp.publicKey)); } function calculateX25519Public(k) { assert.buffer(k); if (nacl === undefined) nacl = require('tweetnacl'); var kp = nacl.box.keyPair.fromSeed(new Uint8Array(k)); return (Buffer.from(kp.publicKey)); } 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); } } function publicFromPrivateECDSA(curveName, priv) { assert.string(curveName, 'curveName'); assert.buffer(priv); if (ec === undefined) ec = require('ecc-jsbn/lib/ec'); if (jsbn === undefined) jsbn = require('jsbn').BigInteger; var params = algs.curves[curveName]; var p = new jsbn(params.p); var a = new jsbn(params.a); var b = new jsbn(params.b); var curve = new ec.ECCurveFp(p, a, b); var G = curve.decodePointHex(params.G.toString('hex')); var d = new jsbn(mpNormalize(priv)); var pub = G.multiply(d); pub = Buffer.from(curve.encodePointHex(pub), 'hex'); var parts = []; parts.push({name: 'curve', data: Buffer.from(curveName)}); parts.push({name: 'Q', data: pub}); var key = new Key({type: 'ecdsa', curve: curve, parts: parts}); return (key); } function opensshCipherInfo(cipher) { var inf = {}; switch (cipher) { case '3des-cbc': inf.keySize = 24; inf.blockSize = 8; inf.opensslName = 'des-ede3-cbc'; break; case 'blowfish-cbc': inf.keySize = 16; inf.blockSize = 8; inf.opensslName = 'bf-cbc'; break; case 'aes128-cbc': case 'aes128-ctr': case 'aes128-gcm@openssh.com': inf.keySize = 16; inf.blockSize = 16; inf.opensslName = 'aes-128-' + cipher.slice(7, 10); break; case 'aes192-cbc': case 'aes192-ctr': case 'aes192-gcm@openssh.com': inf.keySize = 24; inf.blockSize = 16; inf.opensslName = 'aes-192-' + cipher.slice(7, 10); break; case 'aes256-cbc': case 'aes256-ctr': case 'aes256-gcm@openssh.com': inf.keySize = 32; inf.blockSize = 16; inf.opensslName = 'aes-256-' + cipher.slice(7, 10); break; default: throw (new Error( 'Unsupported openssl cipher "' + cipher + '"')); } return (inf); } Back

Edit File : utils.js | Size : 9.38 KB

module.exports = {
	bufferSplit: bufferSplit,
	addRSAMissing: addRSAMissing,
	calculateDSAPublic: calculateDSAPublic,
	calculateED25519Public: calculateED25519Public,
	calculateX25519Public: calculateX25519Public,
	mpNormalize: mpNormalize,
	mpDenormalize: mpDenormalize,
	ecNormalize: ecNormalize,
	countZeros: countZeros,
	assertCompatible: assertCompatible,
	isCompatible: isCompatible,
	opensslKeyDeriv: opensslKeyDeriv,
	opensshCipherInfo: opensshCipherInfo,
	publicFromPrivateECDSA: publicFromPrivateECDSA,
	zeroPadToLength: zeroPadToLength,
	writeBitString: writeBitString,
	readBitString: readBitString
};

var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var PrivateKey = require('./private-key');
var Key = require('./key');
var crypto = require('crypto');
var algs = require('./algs');
var asn1 = require('asn1');

var ec, jsbn;
var nacl;

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 = Buffer.alloc(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 readBitString(der, tag) {
	if (tag === undefined)
		tag = asn1.Ber.BitString;
	var buf = der.readString(tag, true);
	assert.strictEqual(buf[0], 0x00, 'bit strings with unused bits are ' +
	    'not supported (0x' + buf[0].toString(16) + ')');
	return (buf.slice(1));
}

function writeBitString(der, buf, tag) {
	if (tag === undefined)
		tag = asn1.Ber.BitString;
	var b = Buffer.alloc(buf.length + 1);
	b[0] = 0x00;
	buf.copy(b, 1);
	der.writeBuffer(b, tag);
}

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 = Buffer.alloc(buf.length + 1);
		b[0] = 0x00;
		buf.copy(b, 1);
		buf = b;
	}
	return (buf);
}

function mpDenormalize(buf) {
	assert.buffer(buf);
	while (buf.length > 1 && buf[0] === 0x00)
		buf = buf.slice(1);
	return (buf);
}

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

function calculateED25519Public(k) {
	assert.buffer(k);

if (nacl === undefined)
		nacl = require('tweetnacl');

var kp = nacl.sign.keyPair.fromSeed(new Uint8Array(k));
	return (Buffer.from(kp.publicKey));
}

function calculateX25519Public(k) {
	assert.buffer(k);

if (nacl === undefined)
		nacl = require('tweetnacl');

var kp = nacl.box.keyPair.fromSeed(new Uint8Array(k));
	return (Buffer.from(kp.publicKey));
}

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);
	}
}

function publicFromPrivateECDSA(curveName, priv) {
	assert.string(curveName, 'curveName');
	assert.buffer(priv);
	if (ec === undefined)
		ec = require('ecc-jsbn/lib/ec');
	if (jsbn === undefined)
		jsbn = require('jsbn').BigInteger;
	var params = algs.curves[curveName];
	var p = new jsbn(params.p);
	var a = new jsbn(params.a);
	var b = new jsbn(params.b);
	var curve = new ec.ECCurveFp(p, a, b);
	var G = curve.decodePointHex(params.G.toString('hex'));

var d = new jsbn(mpNormalize(priv));
	var pub = G.multiply(d);
	pub = Buffer.from(curve.encodePointHex(pub), 'hex');

var parts = [];
	parts.push({name: 'curve', data: Buffer.from(curveName)});
	parts.push({name: 'Q', data: pub});

var key = new Key({type: 'ecdsa', curve: curve, parts: parts});
	return (key);
}

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