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// Copyright 2017 Joyent, Inc.
module.exports = Key;
var assert = require('assert-plus');
var algs = require('./algs');
var crypto = require('crypto');
var Fingerprint = require('./fingerprint');
var Signature = require('./signature');
var DiffieHellman = require('./dhe').DiffieHellman;
var errs = require('./errors');
var utils = require('./utils');
var PrivateKey = require('./private-key');
var edCompat;
try {
edCompat = require('./ed-compat');
} catch (e) {
/* Just continue through, and bail out if we try to use it. */
}
var InvalidAlgorithmError = errs.InvalidAlgorithmError;
var KeyParseError = errs.KeyParseError;
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'] = require('./formats/ssh');
formats['ssh-private'] = require('./formats/ssh-private');
formats['openssh'] = formats['ssh-private'];
formats['dnssec'] = require('./formats/dnssec');
function Key(opts) {
assert.object(opts, 'options');
assert.arrayOfObject(opts.parts, 'options.parts');
assert.string(opts.type, 'options.type');
assert.optionalString(opts.comment, 'options.comment');
var algInfo = algs.info[opts.type];
if (typeof (algInfo) !== 'object')
throw (new InvalidAlgorithmError(opts.type));
var partLookup = {};
for (var i = 0; i < opts.parts.length; ++i) {
var part = opts.parts[i];
partLookup[part.name] = part;
}
this.type = opts.type;
this.parts = opts.parts;
this.part = partLookup;
this.comment = undefined;
this.source = opts.source;
/* for speeding up hashing/fingerprint operations */
this._rfc4253Cache = opts._rfc4253Cache;
this._hashCache = {};
var sz;
this.curve = undefined;
if (this.type === 'ecdsa') {
var curve = this.part.curve.data.toString();
this.curve = curve;
sz = algs.curves[curve].size;
} else if (this.type === 'ed25519' || this.type === 'curve25519') {
sz = 256;
this.curve = 'curve25519';
} else {
var szPart = this.part[algInfo.sizePart];
sz = szPart.data.length;
sz = sz * 8 - utils.countZeros(szPart.data);
}
this.size = sz;
}
Key.formats = formats;
Key.prototype.toBuffer = function (format, options) {
if (format === undefined)
format = 'ssh';
assert.string(format, 'format');
assert.object(formats[format], 'formats[format]');
assert.optionalObject(options, 'options');
if (format === 'rfc4253') {
if (this._rfc4253Cache === undefined)
this._rfc4253Cache = formats['rfc4253'].write(this);
return (this._rfc4253Cache);
}
return (formats[format].write(this, options));
};
Key.prototype.toString = function (format, options) {
return (this.toBuffer(format, options).toString());
};
Key.prototype.hash = function (algo) {
assert.string(algo, 'algorithm');
algo = algo.toLowerCase();
if (algs.hashAlgs[algo] === undefined)
throw (new InvalidAlgorithmError(algo));
if (this._hashCache[algo])
return (this._hashCache[algo]);
var hash = crypto.createHash(algo).
update(this.toBuffer('rfc4253')).digest();
this._hashCache[algo] = hash;
return (hash);
};
Key.prototype.fingerprint = function (algo) {
if (algo === undefined)
algo = 'sha256';
assert.string(algo, 'algorithm');
var opts = {
type: 'key',
hash: this.hash(algo),
algorithm: algo
};
return (new Fingerprint(opts));
};
Key.prototype.defaultHashAlgorithm = function () {
var hashAlgo = 'sha1';
if (this.type === 'rsa')
hashAlgo = 'sha256';
if (this.type === 'dsa' && this.size > 1024)
hashAlgo = 'sha256';
if (this.type === 'ed25519')
hashAlgo = 'sha512';
if (this.type === 'ecdsa') {
if (this.size <= 256)
hashAlgo = 'sha256';
else if (this.size <= 384)
hashAlgo = 'sha384';
else
hashAlgo = 'sha512';
}
return (hashAlgo);
};
Key.prototype.createVerify = 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.Verifier(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.createVerify(nm);
} catch (e) {
err = e;
}
if (v === undefined || (err instanceof Error &&
err.message.match(/Unknown message digest/))) {
nm = 'RSA-';
nm += hashAlgo.toUpperCase();
v = crypto.createVerify(nm);
}
assert.ok(v, 'failed to create verifier');
var oldVerify = v.verify.bind(v);
var key = this.toBuffer('pkcs8');
var curve = this.curve;
var self = this;
v.verify = function (signature, fmt) {
if (Signature.isSignature(signature, [2, 0])) {
if (signature.type !== self.type)
return (false);
if (signature.hashAlgorithm &&
signature.hashAlgorithm !== hashAlgo)
return (false);
if (signature.curve && self.type === 'ecdsa' &&
signature.curve !== curve)
return (false);
return (oldVerify(key, signature.toBuffer('asn1')));
} else if (typeof (signature) === 'string' ||
Buffer.isBuffer(signature)) {
return (oldVerify(key, signature, fmt));
/*
* Avoid doing this on valid arguments, walking the prototype
* chain can be quite slow.
*/
} else if (Signature.isSignature(signature, [1, 0])) {
throw (new Error('signature was created by too old ' +
'a version of sshpk and cannot be verified'));
} else {
throw (new TypeError('signature must be a string, ' +
'Buffer, or Signature object'));
}
};
return (v);
};
Key.prototype.createDiffieHellman = function () {
if (this.type === 'rsa')
throw (new Error('RSA keys do not support Diffie-Hellman'));
return (new DiffieHellman(this));
};
Key.prototype.createDH = Key.prototype.createDiffieHellman;
Key.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);
if (k instanceof PrivateKey)
k = k.toPublic();
if (!k.comment)
k.comment = options.filename;
return (k);
} catch (e) {
if (e.name === 'KeyEncryptedError')
throw (e);
throw (new KeyParseError(options.filename, format, e));
}
};
Key.isKey = function (obj, ver) {
return (utils.isCompatible(obj, Key, ver));
};
/*
* API versions for Key:
* [1,0] -- initial ver, may take Signature for createVerify or may not
* [1,1] -- added pkcs1, pkcs8 formats
* [1,2] -- added auto, ssh-private, openssh formats
* [1,3] -- added defaultHashAlgorithm
* [1,4] -- added ed support, createDH
* [1,5] -- first explicitly tagged version
* [1,6] -- changed ed25519 part names
*/
Key.prototype._sshpkApiVersion = [1, 6];
Key._oldVersionDetect = function (obj) {
assert.func(obj.toBuffer);
assert.func(obj.fingerprint);
if (obj.createDH)
return ([1, 4]);
if (obj.defaultHashAlgorithm)
return ([1, 3]);
if (obj.formats['auto'])
return ([1, 2]);
if (obj.formats['pkcs1'])
return ([1, 1]);
return ([1, 0]);
};