412 lines
11 KiB
JavaScript
412 lines
11 KiB
JavaScript
|
// Copyright 2017 Joyent, Inc.
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
DiffieHellman: DiffieHellman,
|
||
|
|
generateECDSA: generateECDSA,
|
||
|
|
generateED25519: generateED25519
|
||
|
|
};
|
||
|
|
|
||
|
|
var assert = require('assert-plus');
|
||
|
|
var crypto = require('crypto');
|
||
|
|
var algs = require('./algs');
|
||
|
|
var utils = require('./utils');
|
||
|
|
var nacl;
|
||
|
|
|
||
|
|
var Key = require('./key');
|
||
|
|
var PrivateKey = require('./private-key');
|
||
|
|
|
||
|
|
var CRYPTO_HAVE_ECDH = (crypto.createECDH !== undefined);
|
||
|
|
|
||
|
|
var ecdh, ec, jsbn;
|
||
|
|
|
||
|
|
function DiffieHellman(key) {
|
||
|
|
utils.assertCompatible(key, Key, [1, 4], 'key');
|
||
|
|
this._isPriv = PrivateKey.isPrivateKey(key, [1, 3]);
|
||
|
|
this._algo = key.type;
|
||
|
|
this._curve = key.curve;
|
||
|
|
this._key = key;
|
||
|
|
if (key.type === 'dsa') {
|
||
|
|
if (!CRYPTO_HAVE_ECDH) {
|
||
|
|
throw (new Error('Due to bugs in the node 0.10 ' +
|
||
|
|
'crypto API, node 0.12.x or later is required ' +
|
||
|
|
'to use DH'));
|
||
|
|
}
|
||
|
|
this._dh = crypto.createDiffieHellman(
|
||
|
|
key.part.p.data, undefined,
|
||
|
|
key.part.g.data, undefined);
|
||
|
|
this._p = key.part.p;
|
||
|
|
this._g = key.part.g;
|
||
|
|
if (this._isPriv)
|
||
|
|
this._dh.setPrivateKey(key.part.x.data);
|
||
|
|
this._dh.setPublicKey(key.part.y.data);
|
||
|
|
|
||
|
|
} else if (key.type === 'ecdsa') {
|
||
|
|
if (!CRYPTO_HAVE_ECDH) {
|
||
|
|
if (ecdh === undefined)
|
||
|
|
ecdh = require('ecc-jsbn');
|
||
|
|
if (ec === undefined)
|
||
|
|
ec = require('ecc-jsbn/lib/ec');
|
||
|
|
if (jsbn === undefined)
|
||
|
|
jsbn = require('jsbn').BigInteger;
|
||
|
|
|
||
|
|
this._ecParams = new X9ECParameters(this._curve);
|
||
|
|
|
||
|
|
if (this._isPriv) {
|
||
|
|
this._priv = new ECPrivate(
|
||
|
|
this._ecParams, key.part.d.data);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var curve = {
|
||
|
|
'nistp256': 'prime256v1',
|
||
|
|
'nistp384': 'secp384r1',
|
||
|
|
'nistp521': 'secp521r1'
|
||
|
|
}[key.curve];
|
||
|
|
this._dh = crypto.createECDH(curve);
|
||
|
|
if (typeof (this._dh) !== 'object' ||
|
||
|
|
typeof (this._dh.setPrivateKey) !== 'function') {
|
||
|
|
CRYPTO_HAVE_ECDH = false;
|
||
|
|
DiffieHellman.call(this, key);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (this._isPriv)
|
||
|
|
this._dh.setPrivateKey(key.part.d.data);
|
||
|
|
this._dh.setPublicKey(key.part.Q.data);
|
||
|
|
|
||
|
|
} else if (key.type === 'curve25519') {
|
||
|
|
if (nacl === undefined)
|
||
|
|
nacl = require('tweetnacl');
|
||
|
|
|
||
|
|
if (this._isPriv) {
|
||
|
|
this._priv = key.part.r.data;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
throw (new Error('DH not supported for ' + key.type + ' keys'));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
DiffieHellman.prototype.getPublicKey = function () {
|
||
|
|
if (this._isPriv)
|
||
|
|
return (this._key.toPublic());
|
||
|
|
return (this._key);
|
||
|
|
};
|
||
|
|
|
||
|
|
DiffieHellman.prototype.getPrivateKey = function () {
|
||
|
|
if (this._isPriv)
|
||
|
|
return (this._key);
|
||
|
|
else
|
||
|
|
return (undefined);
|
||
|
|
};
|
||
|
|
DiffieHellman.prototype.getKey = DiffieHellman.prototype.getPrivateKey;
|
||
|
|
|
||
|
|
DiffieHellman.prototype._keyCheck = function (pk, isPub) {
|
||
|
|
assert.object(pk, 'key');
|
||
|
|
if (!isPub)
|
||
|
|
utils.assertCompatible(pk, PrivateKey, [1, 3], 'key');
|
||
|
|
utils.assertCompatible(pk, Key, [1, 4], 'key');
|
||
|
|
|
||
|
|
if (pk.type !== this._algo) {
|
||
|
|
throw (new Error('A ' + pk.type + ' key cannot be used in ' +
|
||
|
|
this._algo + ' Diffie-Hellman'));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pk.curve !== this._curve) {
|
||
|
|
throw (new Error('A key from the ' + pk.curve + ' curve ' +
|
||
|
|
'cannot be used with a ' + this._curve +
|
||
|
|
' Diffie-Hellman'));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pk.type === 'dsa') {
|
||
|
|
assert.deepEqual(pk.part.p, this._p,
|
||
|
|
'DSA key prime does not match');
|
||
|
|
assert.deepEqual(pk.part.g, this._g,
|
||
|
|
'DSA key generator does not match');
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
DiffieHellman.prototype.setKey = function (pk) {
|
||
|
|
this._keyCheck(pk);
|
||
|
|
|
||
|
|
if (pk.type === 'dsa') {
|
||
|
|
this._dh.setPrivateKey(pk.part.x.data);
|
||
|
|
this._dh.setPublicKey(pk.part.y.data);
|
||
|
|
|
||
|
|
} else if (pk.type === 'ecdsa') {
|
||
|
|
if (CRYPTO_HAVE_ECDH) {
|
||
|
|
this._dh.setPrivateKey(pk.part.d.data);
|
||
|
|
this._dh.setPublicKey(pk.part.Q.data);
|
||
|
|
} else {
|
||
|
|
this._priv = new ECPrivate(
|
||
|
|
this._ecParams, pk.part.d.data);
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (pk.type === 'curve25519') {
|
||
|
|
this._priv = pk.part.r.data;
|
||
|
|
if (this._priv[0] === 0x00)
|
||
|
|
this._priv = this._priv.slice(1);
|
||
|
|
this._priv = this._priv.slice(0, 32);
|
||
|
|
}
|
||
|
|
this._key = pk;
|
||
|
|
this._isPriv = true;
|
||
|
|
};
|
||
|
|
DiffieHellman.prototype.setPrivateKey = DiffieHellman.prototype.setKey;
|
||
|
|
|
||
|
|
DiffieHellman.prototype.computeSecret = function (otherpk) {
|
||
|
|
this._keyCheck(otherpk, true);
|
||
|
|
if (!this._isPriv)
|
||
|
|
throw (new Error('DH exchange has not been initialized with ' +
|
||
|
|
'a private key yet'));
|
||
|
|
|
||
|
|
var pub;
|
||
|
|
if (this._algo === 'dsa') {
|
||
|
|
return (this._dh.computeSecret(
|
||
|
|
otherpk.part.y.data));
|
||
|
|
|
||
|
|
} else if (this._algo === 'ecdsa') {
|
||
|
|
if (CRYPTO_HAVE_ECDH) {
|
||
|
|
return (this._dh.computeSecret(
|
||
|
|
otherpk.part.Q.data));
|
||
|
|
} else {
|
||
|
|
pub = new ECPublic(
|
||
|
|
this._ecParams, otherpk.part.Q.data);
|
||
|
|
return (this._priv.deriveSharedSecret(pub));
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (this._algo === 'curve25519') {
|
||
|
|
pub = otherpk.part.R.data;
|
||
|
|
while (pub[0] === 0x00 && pub.length > 32)
|
||
|
|
pub = pub.slice(1);
|
||
|
|
assert.strictEqual(pub.length, 32);
|
||
|
|
assert.strictEqual(this._priv.length, 64);
|
||
|
|
|
||
|
|
var priv = this._priv.slice(0, 32);
|
||
|
|
|
||
|
|
var secret = nacl.box.before(new Uint8Array(pub),
|
||
|
|
new Uint8Array(priv));
|
||
|
|
|
||
|
|
return (new Buffer(secret));
|
||
|
|
}
|
||
|
|
|
||
|
|
throw (new Error('Invalid algorithm: ' + this._algo));
|
||
|
|
};
|
||
|
|
|
||
|
|
DiffieHellman.prototype.generateKey = function () {
|
||
|
|
var parts = [];
|
||
|
|
var priv, pub;
|
||
|
|
if (this._algo === 'dsa') {
|
||
|
|
this._dh.generateKeys();
|
||
|
|
|
||
|
|
parts.push({name: 'p', data: this._p.data});
|
||
|
|
parts.push({name: 'q', data: this._key.part.q.data});
|
||
|
|
parts.push({name: 'g', data: this._g.data});
|
||
|
|
parts.push({name: 'y', data: this._dh.getPublicKey()});
|
||
|
|
parts.push({name: 'x', data: this._dh.getPrivateKey()});
|
||
|
|
this._key = new PrivateKey({
|
||
|
|
type: 'dsa',
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
this._isPriv = true;
|
||
|
|
return (this._key);
|
||
|
|
|
||
|
|
} else if (this._algo === 'ecdsa') {
|
||
|
|
if (CRYPTO_HAVE_ECDH) {
|
||
|
|
this._dh.generateKeys();
|
||
|
|
|
||
|
|
parts.push({name: 'curve',
|
||
|
|
data: new Buffer(this._curve)});
|
||
|
|
parts.push({name: 'Q', data: this._dh.getPublicKey()});
|
||
|
|
parts.push({name: 'd', data: this._dh.getPrivateKey()});
|
||
|
|
this._key = new PrivateKey({
|
||
|
|
type: 'ecdsa',
|
||
|
|
curve: this._curve,
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
this._isPriv = true;
|
||
|
|
return (this._key);
|
||
|
|
|
||
|
|
} else {
|
||
|
|
var n = this._ecParams.getN();
|
||
|
|
var r = new jsbn(crypto.randomBytes(n.bitLength()));
|
||
|
|
var n1 = n.subtract(jsbn.ONE);
|
||
|
|
priv = r.mod(n1).add(jsbn.ONE);
|
||
|
|
pub = this._ecParams.getG().multiply(priv);
|
||
|
|
|
||
|
|
priv = new Buffer(priv.toByteArray());
|
||
|
|
pub = new Buffer(this._ecParams.getCurve().
|
||
|
|
encodePointHex(pub), 'hex');
|
||
|
|
|
||
|
|
this._priv = new ECPrivate(this._ecParams, priv);
|
||
|
|
|
||
|
|
parts.push({name: 'curve',
|
||
|
|
data: new Buffer(this._curve)});
|
||
|
|
parts.push({name: 'Q', data: pub});
|
||
|
|
parts.push({name: 'd', data: priv});
|
||
|
|
|
||
|
|
this._key = new PrivateKey({
|
||
|
|
type: 'ecdsa',
|
||
|
|
curve: this._curve,
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
this._isPriv = true;
|
||
|
|
return (this._key);
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (this._algo === 'curve25519') {
|
||
|
|
var pair = nacl.box.keyPair();
|
||
|
|
priv = new Buffer(pair.secretKey);
|
||
|
|
pub = new Buffer(pair.publicKey);
|
||
|
|
priv = Buffer.concat([priv, pub]);
|
||
|
|
assert.strictEqual(priv.length, 64);
|
||
|
|
assert.strictEqual(pub.length, 32);
|
||
|
|
|
||
|
|
parts.push({name: 'R', data: pub});
|
||
|
|
parts.push({name: 'r', data: priv});
|
||
|
|
this._key = new PrivateKey({
|
||
|
|
type: 'curve25519',
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
this._isPriv = true;
|
||
|
|
return (this._key);
|
||
|
|
}
|
||
|
|
|
||
|
|
throw (new Error('Invalid algorithm: ' + this._algo));
|
||
|
|
};
|
||
|
|
DiffieHellman.prototype.generateKeys = DiffieHellman.prototype.generateKey;
|
||
|
|
|
||
|
|
/* These are helpers for using ecc-jsbn (for node 0.10 compatibility). */
|
||
|
|
|
||
|
|
function X9ECParameters(name) {
|
||
|
|
var params = algs.curves[name];
|
||
|
|
assert.object(params);
|
||
|
|
|
||
|
|
var p = new jsbn(params.p);
|
||
|
|
var a = new jsbn(params.a);
|
||
|
|
var b = new jsbn(params.b);
|
||
|
|
var n = new jsbn(params.n);
|
||
|
|
var h = jsbn.ONE;
|
||
|
|
var curve = new ec.ECCurveFp(p, a, b);
|
||
|
|
var G = curve.decodePointHex(params.G.toString('hex'));
|
||
|
|
|
||
|
|
this.curve = curve;
|
||
|
|
this.g = G;
|
||
|
|
this.n = n;
|
||
|
|
this.h = h;
|
||
|
|
}
|
||
|
|
X9ECParameters.prototype.getCurve = function () { return (this.curve); };
|
||
|
|
X9ECParameters.prototype.getG = function () { return (this.g); };
|
||
|
|
X9ECParameters.prototype.getN = function () { return (this.n); };
|
||
|
|
X9ECParameters.prototype.getH = function () { return (this.h); };
|
||
|
|
|
||
|
|
function ECPublic(params, buffer) {
|
||
|
|
this._params = params;
|
||
|
|
if (buffer[0] === 0x00)
|
||
|
|
buffer = buffer.slice(1);
|
||
|
|
this._pub = params.getCurve().decodePointHex(buffer.toString('hex'));
|
||
|
|
}
|
||
|
|
|
||
|
|
function ECPrivate(params, buffer) {
|
||
|
|
this._params = params;
|
||
|
|
this._priv = new jsbn(utils.mpNormalize(buffer));
|
||
|
|
}
|
||
|
|
ECPrivate.prototype.deriveSharedSecret = function (pubKey) {
|
||
|
|
assert.ok(pubKey instanceof ECPublic);
|
||
|
|
var S = pubKey._pub.multiply(this._priv);
|
||
|
|
return (new Buffer(S.getX().toBigInteger().toByteArray()));
|
||
|
|
};
|
||
|
|
|
||
|
|
function generateED25519() {
|
||
|
|
if (nacl === undefined)
|
||
|
|
nacl = require('tweetnacl');
|
||
|
|
|
||
|
|
var pair = nacl.sign.keyPair();
|
||
|
|
var priv = new Buffer(pair.secretKey);
|
||
|
|
var pub = new Buffer(pair.publicKey);
|
||
|
|
assert.strictEqual(priv.length, 64);
|
||
|
|
assert.strictEqual(pub.length, 32);
|
||
|
|
|
||
|
|
var parts = [];
|
||
|
|
parts.push({name: 'R', data: pub});
|
||
|
|
parts.push({name: 'r', data: priv});
|
||
|
|
var key = new PrivateKey({
|
||
|
|
type: 'ed25519',
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
return (key);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Generates a new ECDSA private key on a given curve. */
|
||
|
|
function generateECDSA(curve) {
|
||
|
|
var parts = [];
|
||
|
|
var key;
|
||
|
|
|
||
|
|
if (CRYPTO_HAVE_ECDH) {
|
||
|
|
/*
|
||
|
|
* Node crypto doesn't expose key generation directly, but the
|
||
|
|
* ECDH instances can generate keys. It turns out this just
|
||
|
|
* calls into the OpenSSL generic key generator, and we can
|
||
|
|
* read its output happily without doing an actual DH. So we
|
||
|
|
* use that here.
|
||
|
|
*/
|
||
|
|
var osCurve = {
|
||
|
|
'nistp256': 'prime256v1',
|
||
|
|
'nistp384': 'secp384r1',
|
||
|
|
'nistp521': 'secp521r1'
|
||
|
|
}[curve];
|
||
|
|
|
||
|
|
var dh = crypto.createECDH(osCurve);
|
||
|
|
dh.generateKeys();
|
||
|
|
|
||
|
|
parts.push({name: 'curve',
|
||
|
|
data: new Buffer(curve)});
|
||
|
|
parts.push({name: 'Q', data: dh.getPublicKey()});
|
||
|
|
parts.push({name: 'd', data: dh.getPrivateKey()});
|
||
|
|
|
||
|
|
key = new PrivateKey({
|
||
|
|
type: 'ecdsa',
|
||
|
|
curve: curve,
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
return (key);
|
||
|
|
|
||
|
|
} else {
|
||
|
|
if (ecdh === undefined)
|
||
|
|
ecdh = require('ecc-jsbn');
|
||
|
|
if (ec === undefined)
|
||
|
|
ec = require('ecc-jsbn/lib/ec');
|
||
|
|
if (jsbn === undefined)
|
||
|
|
jsbn = require('jsbn').BigInteger;
|
||
|
|
|
||
|
|
var ecParams = new X9ECParameters(curve);
|
||
|
|
|
||
|
|
/* This algorithm taken from FIPS PUB 186-4 (section B.4.1) */
|
||
|
|
var n = ecParams.getN();
|
||
|
|
/*
|
||
|
|
* The crypto.randomBytes() function can only give us whole
|
||
|
|
* bytes, so taking a nod from X9.62, we round up.
|
||
|
|
*/
|
||
|
|
var cByteLen = Math.ceil((n.bitLength() + 64) / 8);
|
||
|
|
var c = new jsbn(crypto.randomBytes(cByteLen));
|
||
|
|
|
||
|
|
var n1 = n.subtract(jsbn.ONE);
|
||
|
|
var priv = c.mod(n1).add(jsbn.ONE);
|
||
|
|
var pub = ecParams.getG().multiply(priv);
|
||
|
|
|
||
|
|
priv = new Buffer(priv.toByteArray());
|
||
|
|
pub = new Buffer(ecParams.getCurve().
|
||
|
|
encodePointHex(pub), 'hex');
|
||
|
|
|
||
|
|
parts.push({name: 'curve', data: new Buffer(curve)});
|
||
|
|
parts.push({name: 'Q', data: pub});
|
||
|
|
parts.push({name: 'd', data: priv});
|
||
|
|
|
||
|
|
key = new PrivateKey({
|
||
|
|
type: 'ecdsa',
|
||
|
|
curve: curve,
|
||
|
|
parts: parts
|
||
|
|
});
|
||
|
|
return (key);
|
||
|
|
}
|
||
|
|
}
|