| // Copyright 2015 Joyent, Inc. |
| |
| module.exports = { |
| read: read, |
| write: write |
| }; |
| |
| var assert = require('assert-plus'); |
| var asn1 = require('asn1'); |
| var crypto = require('crypto'); |
| var algs = require('../algs'); |
| var utils = require('../utils'); |
| var Key = require('../key'); |
| var PrivateKey = require('../private-key'); |
| |
| var pkcs1 = require('./pkcs1'); |
| var pkcs8 = require('./pkcs8'); |
| var sshpriv = require('./ssh-private'); |
| var rfc4253 = require('./rfc4253'); |
| |
| var errors = require('../errors'); |
| |
| /* |
| * For reading we support both PKCS#1 and PKCS#8. If we find a private key, |
| * we just take the public component of it and use that. |
| */ |
| function read(buf, options, forceType) { |
| var input = buf; |
| if (typeof (buf) !== 'string') { |
| assert.buffer(buf, 'buf'); |
| buf = buf.toString('ascii'); |
| } |
| |
| var lines = buf.trim().split('\n'); |
| |
| var m = lines[0].match(/*JSSTYLED*/ |
| /[-]+[ ]*BEGIN ([A-Z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/); |
| assert.ok(m, 'invalid PEM header'); |
| |
| var m2 = lines[lines.length - 1].match(/*JSSTYLED*/ |
| /[-]+[ ]*END ([A-Z0-9]+ )?(PUBLIC|PRIVATE) KEY[ ]*[-]+/); |
| assert.ok(m2, 'invalid PEM footer'); |
| |
| /* Begin and end banners must match key type */ |
| assert.equal(m[2], m2[2]); |
| var type = m[2].toLowerCase(); |
| |
| var alg; |
| if (m[1]) { |
| /* They also must match algorithms, if given */ |
| assert.equal(m[1], m2[1], 'PEM header and footer mismatch'); |
| alg = m[1].trim(); |
| } |
| |
| var headers = {}; |
| while (true) { |
| lines = lines.slice(1); |
| m = lines[0].match(/*JSSTYLED*/ |
| /^([A-Za-z0-9-]+): (.+)$/); |
| if (!m) |
| break; |
| headers[m[1].toLowerCase()] = m[2]; |
| } |
| |
| var cipher, key, iv; |
| if (headers['proc-type']) { |
| var parts = headers['proc-type'].split(','); |
| if (parts[0] === '4' && parts[1] === 'ENCRYPTED') { |
| if (typeof (options.passphrase) === 'string') { |
| options.passphrase = new Buffer( |
| options.passphrase, 'utf-8'); |
| } |
| if (!Buffer.isBuffer(options.passphrase)) { |
| throw (new errors.KeyEncryptedError( |
| options.filename, 'PEM')); |
| } else { |
| parts = headers['dek-info'].split(','); |
| assert.ok(parts.length === 2); |
| cipher = parts[0].toLowerCase(); |
| iv = new Buffer(parts[1], 'hex'); |
| key = utils.opensslKeyDeriv(cipher, iv, |
| options.passphrase, 1).key; |
| } |
| } |
| } |
| |
| /* Chop off the first and last lines */ |
| lines = lines.slice(0, -1).join(''); |
| buf = new Buffer(lines, 'base64'); |
| |
| if (cipher && key && iv) { |
| var cipherStream = crypto.createDecipheriv(cipher, key, iv); |
| 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(buf); |
| cipherStream.end(); |
| while ((chunk = cipherStream.read()) !== null) |
| chunks.push(chunk); |
| buf = Buffer.concat(chunks); |
| } |
| |
| /* The new OpenSSH internal format abuses PEM headers */ |
| if (alg && alg.toLowerCase() === 'openssh') |
| return (sshpriv.readSSHPrivate(type, buf)); |
| if (alg && alg.toLowerCase() === 'ssh2') |
| return (rfc4253.readType(type, buf)); |
| |
| var der = new asn1.BerReader(buf); |
| der.originalInput = input; |
| |
| /* |
| * All of the PEM file types start with a sequence tag, so chop it |
| * off here |
| */ |
| der.readSequence(); |
| |
| /* PKCS#1 type keys name an algorithm in the banner explicitly */ |
| if (alg) { |
| if (forceType) |
| assert.strictEqual(forceType, 'pkcs1'); |
| return (pkcs1.readPkcs1(alg, type, der)); |
| } else { |
| if (forceType) |
| assert.strictEqual(forceType, 'pkcs8'); |
| return (pkcs8.readPkcs8(alg, type, der)); |
| } |
| } |
| |
| function write(key, options, type) { |
| assert.object(key); |
| |
| var alg = {'ecdsa': 'EC', 'rsa': 'RSA', 'dsa': 'DSA'}[key.type]; |
| var header; |
| |
| var der = new asn1.BerWriter(); |
| |
| if (PrivateKey.isPrivateKey(key)) { |
| if (type && type === 'pkcs8') { |
| header = 'PRIVATE KEY'; |
| pkcs8.writePkcs8(der, key); |
| } else { |
| if (type) |
| assert.strictEqual(type, 'pkcs1'); |
| header = alg + ' PRIVATE KEY'; |
| pkcs1.writePkcs1(der, key); |
| } |
| |
| } else if (Key.isKey(key)) { |
| if (type && type === 'pkcs1') { |
| header = alg + ' PUBLIC KEY'; |
| pkcs1.writePkcs1(der, key); |
| } else { |
| if (type) |
| assert.strictEqual(type, 'pkcs8'); |
| header = 'PUBLIC KEY'; |
| pkcs8.writePkcs8(der, key); |
| } |
| |
| } else { |
| throw (new Error('key is not a Key or PrivateKey')); |
| } |
| |
| var tmp = der.buffer.toString('base64'); |
| var len = tmp.length + (tmp.length / 64) + |
| 18 + 16 + header.length*2 + 10; |
| var buf = new Buffer(len); |
| var o = 0; |
| o += buf.write('-----BEGIN ' + header + '-----\n', o); |
| for (var i = 0; i < tmp.length; ) { |
| var limit = i + 64; |
| 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)); |
| } |