Current File : //lib/node_modules/npm/node_modules/sshpk/lib/formats/ssh-private.js
// Copyright 2015 Joyent, Inc.
module.exports = {
read: read,
readSSHPrivate: readSSHPrivate,
write: write
};
var assert = require('assert-plus');
var asn1 = require('asn1');
var Buffer = require('safer-buffer').Buffer;
var algs = require('../algs');
var utils = require('../utils');
var crypto = require('crypto');
var Key = require('../key');
var PrivateKey = require('../private-key');
var pem = require('./pem');
var rfc4253 = require('./rfc4253');
var SSHBuffer = require('../ssh-buffer');
var errors = require('../errors');
var bcrypt;
function read(buf, options) {
return (pem.read(buf, options));
}
var MAGIC = 'openssh-key-v1';
function readSSHPrivate(type, buf, options) {
buf = new SSHBuffer({buffer: buf});
var magic = buf.readCString();
assert.strictEqual(magic, MAGIC, 'bad magic string');
var cipher = buf.readString();
var kdf = buf.readString();
var kdfOpts = buf.readBuffer();
var nkeys = buf.readInt();
if (nkeys !== 1) {
throw (new Error('OpenSSH-format key file contains ' +
'multiple keys: this is unsupported.'));
}
var pubKey = buf.readBuffer();
if (type === 'public') {
assert.ok(buf.atEnd(), 'excess bytes left after key');
return (rfc4253.read(pubKey));
}
var privKeyBlob = buf.readBuffer();
assert.ok(buf.atEnd(), 'excess bytes left after key');
var kdfOptsBuf = new SSHBuffer({ buffer: kdfOpts });
switch (kdf) {
case 'none':
if (cipher !== 'none') {
throw (new Error('OpenSSH-format key uses KDF "none" ' +
'but specifies a cipher other than "none"'));
}
break;
case 'bcrypt':
var salt = kdfOptsBuf.readBuffer();
var rounds = kdfOptsBuf.readInt();
var cinf = utils.opensshCipherInfo(cipher);
if (bcrypt === undefined) {
bcrypt = require('bcrypt-pbkdf');
}
if (typeof (options.passphrase) === 'string') {
options.passphrase = Buffer.from(options.passphrase,
'utf-8');
}
if (!Buffer.isBuffer(options.passphrase)) {
throw (new errors.KeyEncryptedError(
options.filename, 'OpenSSH'));
}
var pass = new Uint8Array(options.passphrase);
var salti = new Uint8Array(salt);
/* Use the pbkdf to derive both the key and the IV. */
var out = new Uint8Array(cinf.keySize + cinf.blockSize);
var res = bcrypt.pbkdf(pass, pass.length, salti, salti.length,
out, out.length, rounds);
if (res !== 0) {
throw (new Error('bcrypt_pbkdf function returned ' +
'failure, parameters invalid'));
}
out = Buffer.from(out);
var ckey = out.slice(0, cinf.keySize);
var iv = out.slice(cinf.keySize, cinf.keySize + cinf.blockSize);
var cipherStream = crypto.createDecipheriv(cinf.opensslName,
ckey, iv);
cipherStream.setAutoPadding(false);
var chunk, chunks = [];
cipherStream.once('error', function (e) {
if (e.toString().indexOf('bad decrypt') !== -1) {
throw (new Error('Incorrect passphrase ' +
'supplied, could not decrypt key'));
}
throw (e);
});
cipherStream.write(privKeyBlob);
cipherStream.end();
while ((chunk = cipherStream.read()) !== null)
chunks.push(chunk);
privKeyBlob = Buffer.concat(chunks);
break;
default:
throw (new Error(
'OpenSSH-format key uses unknown KDF "' + kdf + '"'));
}
buf = new SSHBuffer({buffer: privKeyBlob});
var checkInt1 = buf.readInt();
var checkInt2 = buf.readInt();
if (checkInt1 !== checkInt2) {
throw (new Error('Incorrect passphrase supplied, could not ' +
'decrypt key'));
}
var ret = {};
var key = rfc4253.readInternal(ret, 'private', buf.remainder());
buf.skip(ret.consumed);
var comment = buf.readString();
key.comment = comment;
return (key);
}
function write(key, options) {
var pubKey;
if (PrivateKey.isPrivateKey(key))
pubKey = key.toPublic();
else
pubKey = key;
var cipher = 'none';
var kdf = 'none';
var kdfopts = Buffer.alloc(0);
var cinf = { blockSize: 8 };
var passphrase;
if (options !== undefined) {
passphrase = options.passphrase;
if (typeof (passphrase) === 'string')
passphrase = Buffer.from(passphrase, 'utf-8');
if (passphrase !== undefined) {
assert.buffer(passphrase, 'options.passphrase');
assert.optionalString(options.cipher, 'options.cipher');
cipher = options.cipher;
if (cipher === undefined)
cipher = 'aes128-ctr';
cinf = utils.opensshCipherInfo(cipher);
kdf = 'bcrypt';
}
}
var privBuf;
if (PrivateKey.isPrivateKey(key)) {
privBuf = new SSHBuffer({});
var checkInt = crypto.randomBytes(4).readUInt32BE(0);
privBuf.writeInt(checkInt);
privBuf.writeInt(checkInt);
privBuf.write(key.toBuffer('rfc4253'));
privBuf.writeString(key.comment || '');
var n = 1;
while (privBuf._offset % cinf.blockSize !== 0)
privBuf.writeChar(n++);
privBuf = privBuf.toBuffer();
}
switch (kdf) {
case 'none':
break;
case 'bcrypt':
var salt = crypto.randomBytes(16);
var rounds = 16;
var kdfssh = new SSHBuffer({});
kdfssh.writeBuffer(salt);
kdfssh.writeInt(rounds);
kdfopts = kdfssh.toBuffer();
if (bcrypt === undefined) {
bcrypt = require('bcrypt-pbkdf');
}
var pass = new Uint8Array(passphrase);
var salti = new Uint8Array(salt);
/* Use the pbkdf to derive both the key and the IV. */
var out = new Uint8Array(cinf.keySize + cinf.blockSize);
var res = bcrypt.pbkdf(pass, pass.length, salti, salti.length,
out, out.length, rounds);
if (res !== 0) {
throw (new Error('bcrypt_pbkdf function returned ' +
'failure, parameters invalid'));
}
out = Buffer.from(out);
var ckey = out.slice(0, cinf.keySize);
var iv = out.slice(cinf.keySize, cinf.keySize + cinf.blockSize);
var cipherStream = crypto.createCipheriv(cinf.opensslName,
ckey, iv);
cipherStream.setAutoPadding(false);
var chunk, chunks = [];
cipherStream.once('error', function (e) {
throw (e);
});
cipherStream.write(privBuf);
cipherStream.end();
while ((chunk = cipherStream.read()) !== null)
chunks.push(chunk);
privBuf = Buffer.concat(chunks);
break;
default:
throw (new Error('Unsupported kdf ' + kdf));
}
var buf = new SSHBuffer({});
buf.writeCString(MAGIC);
buf.writeString(cipher); /* cipher */
buf.writeString(kdf); /* kdf */
buf.writeBuffer(kdfopts); /* kdfoptions */
buf.writeInt(1); /* nkeys */
buf.writeBuffer(pubKey.toBuffer('rfc4253'));
if (privBuf)
buf.writeBuffer(privBuf);
buf = buf.toBuffer();
var header;
if (PrivateKey.isPrivateKey(key))
header = 'OPENSSH PRIVATE KEY';
else
header = 'OPENSSH PUBLIC KEY';
var tmp = buf.toString('base64');
var len = tmp.length + (tmp.length / 70) +
18 + 16 + header.length*2 + 10;
buf = Buffer.alloc(len);
var o = 0;
o += buf.write('-----BEGIN ' + header + '-----\n', o);
for (var i = 0; i < tmp.length; ) {
var limit = i + 70;
if (limit > tmp.length)
limit = tmp.length;
o += buf.write(tmp.slice(i, limit), o);
buf[o++] = 10;
i = limit;
}
o += buf.write('-----END ' + header + '-----\n', o);
return (buf.slice(0, o));
}
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