1 // Copyright 2015 Joyent, Inc.
8 var assert = require('assert-plus');
9 var utils = require('../utils');
10 var Key = require('../key');
11 var PrivateKey = require('../private-key');
13 var pem = require('./pem');
14 var ssh = require('./ssh');
15 var rfc4253 = require('./rfc4253');
17 function read(buf, options) {
18 if (typeof (buf) === 'string') {
19 if (buf.trim().match(/^[-]+[ ]*BEGIN/))
20 return (pem.read(buf, options));
21 if (buf.match(/^\s*ssh-[a-z]/))
22 return (ssh.read(buf, options));
23 if (buf.match(/^\s*ecdsa-/))
24 return (ssh.read(buf, options));
25 buf = new Buffer(buf, 'binary');
28 if (findPEMHeader(buf))
29 return (pem.read(buf, options));
30 if (findSSHHeader(buf))
31 return (ssh.read(buf, options));
33 if (buf.readUInt32BE(0) < buf.length)
34 return (rfc4253.read(buf, options));
35 throw (new Error('Failed to auto-detect format of key'));
38 function findSSHHeader(buf) {
40 while (offset < buf.length &&
41 (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))
43 if (offset + 4 <= buf.length &&
44 buf.slice(offset, offset + 4).toString('ascii') === 'ssh-')
46 if (offset + 6 <= buf.length &&
47 buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-')
52 function findPEMHeader(buf) {
54 while (offset < buf.length &&
55 (buf[offset] === 32 || buf[offset] === 10))
57 if (buf[offset] !== 45)
59 while (offset < buf.length &&
62 while (offset < buf.length &&
65 if (offset + 5 > buf.length ||
66 buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN')
71 function write(key, options) {
72 throw (new Error('"auto" format cannot be used for writing'));