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// Copyright 2017 Joyent, Inc.
module.exports = PrivateKey;
var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var algs = require('./algs');
var crypto = require('crypto');
var Fingerprint = require('./fingerprint');
var Signature = require('./signature');
var errs = require('./errors');
var util = require('util');
var utils = require('./utils');
var dhe = require('./dhe');
var generateECDSA = dhe.generateECDSA;
var generateED25519 = dhe.generateED25519;
var edCompat;
var nacl;
try {
edCompat = require('./ed-compat');
} catch (e) {
/* Just continue through, and bail out if we try to use it. */
}
var Key = require('./key');
var InvalidAlgorithmError = errs.InvalidAlgorithmError;
var KeyParseError = errs.KeyParseError;
var KeyEncryptedError = errs.KeyEncryptedError;
var formats = {};
formats['auto'] = require('./formats/auto');
formats['pem'] = require('./formats/pem');
formats['pkcs1'] = require('./formats/pkcs1');
formats['pkcs8'] = require('./formats/pkcs8');
formats['rfc4253'] = require('./formats/rfc4253');
formats['ssh-private'] = require('./formats/ssh-private');
formats['openssh'] = formats['ssh-private'];
formats['ssh'] = formats['ssh-private'];
formats['dnssec'] = require('./formats/dnssec');
function PrivateKey(opts) {
assert.object(opts, 'options');
Key.call(this, opts);
this._pubCache = undefined;
}
util.inherits(PrivateKey, Key);
PrivateKey.formats = formats;
PrivateKey.prototype.toBuffer = function (format, options) {
if (format === undefined)
format = 'pkcs1';
assert.string(format, 'format');
assert.object(formats[format], 'formats[format]');
assert.optionalObject(options, 'options');
return (formats[format].write(this, options));
};
PrivateKey.prototype.hash = function (algo) {
return (this.toPublic().hash(algo));
};
PrivateKey.prototype.toPublic = function () {
if (this._pubCache)
return (this._pubCache);
var algInfo = algs.info[this.type];
var pubParts = [];
for (var i = 0; i < algInfo.parts.length; ++i) {
var p = algInfo.parts[i];
pubParts.push(this.part[p]);
}
this._pubCache = new Key({
type: this.type,
source: this,
parts: pubParts
});
if (this.comment)
this._pubCache.comment = this.comment;
return (this._pubCache);
};
PrivateKey.prototype.derive = function (newType) {
assert.string(newType, 'type');
var priv, pub, pair;
if (this.type === 'ed25519' && newType === 'curve25519') {
if (nacl === undefined)
nacl = require('tweetnacl');
priv = this.part.k.data;
if (priv[0] === 0x00)
priv = priv.slice(1);
pair = nacl.box.keyPair.fromSecretKey(new Uint8Array(priv));
pub = Buffer.from(pair.publicKey);
return (new PrivateKey({
type: 'curve25519',
parts: [
{ name: 'A', data: utils.mpNormalize(pub) },
{ name: 'k', data: utils.mpNormalize(priv) }
]
}));
} else if (this.type === 'curve25519' && newType === 'ed25519') {
if (nacl === undefined)
nacl = require('tweetnacl');
priv = this.part.k.data;
if (priv[0] === 0x00)
priv = priv.slice(1);
pair = nacl.sign.keyPair.fromSeed(new Uint8Array(priv));
pub = Buffer.from(pair.publicKey);
return (new PrivateKey({
type: 'ed25519',
parts: [
{ name: 'A', data: utils.mpNormalize(pub) },
{ name: 'k', data: utils.mpNormalize(priv) }
]
}));
}
throw (new Error('Key derivation not supported from ' + this.type +
' to ' + newType));
};
PrivateKey.prototype.createVerify = function (hashAlgo) {
return (this.toPublic().createVerify(hashAlgo));
};
PrivateKey.prototype.createSign = function (hashAlgo) {
if (hashAlgo === undefined)
hashAlgo = this.defaultHashAlgorithm();
assert.string(hashAlgo, 'hash algorithm');
/* ED25519 is not supported by OpenSSL, use a javascript impl. */
if (this.type === 'ed25519' && edCompat !== undefined)
return (new edCompat.Signer(this, hashAlgo));
if (this.type === 'curve25519')
throw (new Error('Curve25519 keys are not suitable for ' +
'signing or verification'));
var v, nm, err;
try {
nm = hashAlgo.toUpperCase();
v = crypto.createSign(nm);
} catch (e) {
err = e;
}
if (v === undefined || (err instanceof Error &&
err.message.match(/Unknown message digest/))) {
nm = 'RSA-';
nm += hashAlgo.toUpperCase();
v = crypto.createSign(nm);
}
assert.ok(v, 'failed to create verifier');
var oldSign = v.sign.bind(v);
var key = this.toBuffer('pkcs1');
var type = this.type;
var curve = this.curve;
v.sign = function () {
var sig = oldSign(key);
if (typeof (sig) === 'string')
sig = Buffer.from(sig, 'binary');
sig = Signature.parse(sig, type, 'asn1');
sig.hashAlgorithm = hashAlgo;
sig.curve = curve;
return (sig);
};
return (v);
};
PrivateKey.parse = function (data, format, options) {
if (typeof (data) !== 'string')
assert.buffer(data, 'data');
if (format === undefined)
format = 'auto';
assert.string(format, 'format');
if (typeof (options) === 'string')
options = { filename: options };
assert.optionalObject(options, 'options');
if (options === undefined)
options = {};
assert.optionalString(options.filename, 'options.filename');
if (options.filename === undefined)
options.filename = '(unnamed)';
assert.object(formats[format], 'formats[format]');
try {
var k = formats[format].read(data, options);
assert.ok(k instanceof PrivateKey, 'key is not a private key');
if (!k.comment)
k.comment = options.filename;
return (k);
} catch (e) {
if (e.name === 'KeyEncryptedError')
throw (e);
throw (new KeyParseError(options.filename, format, e));
}
};
PrivateKey.isPrivateKey = function (obj, ver) {
return (utils.isCompatible(obj, PrivateKey, ver));
};
PrivateKey.generate = function (type, options) {
if (options === undefined)
options = {};
assert.object(options, 'options');
switch (type) {
case 'ecdsa':
if (options.curve === undefined)
options.curve = 'nistp256';
assert.string(options.curve, 'options.curve');
return (generateECDSA(options.curve));
case 'ed25519':
return (generateED25519());
default:
throw (new Error('Key generation not supported with key ' +
'type "' + type + '"'));
}
};
/*
* API versions for PrivateKey:
* [1,0] -- initial ver
* [1,1] -- added auto, pkcs[18], openssh/ssh-private formats
* [1,2] -- added defaultHashAlgorithm
* [1,3] -- added derive, ed, createDH
* [1,4] -- first tagged version
* [1,5] -- changed ed25519 part names and format
*/
PrivateKey.prototype._sshpkApiVersion = [1, 5];
PrivateKey._oldVersionDetect = function (obj) {
assert.func(obj.toPublic);
assert.func(obj.createSign);
if (obj.derive)
return ([1, 3]);
if (obj.defaultHashAlgorithm)
return ([1, 2]);
if (obj.formats['auto'])
return ([1, 1]);
return ([1, 0]);
};
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