| // Copyright 2015 Joyent, Inc. |
| |
| module.exports = { |
| read: read, |
| write: write |
| }; |
| |
| var assert = require('assert-plus'); |
| var utils = require('../utils'); |
| var Key = require('../key'); |
| var PrivateKey = require('../private-key'); |
| |
| var pem = require('./pem'); |
| var ssh = require('./ssh'); |
| var rfc4253 = require('./rfc4253'); |
| |
| function read(buf, options) { |
| if (typeof (buf) === 'string') { |
| if (buf.trim().match(/^[-]+[ ]*BEGIN/)) |
| return (pem.read(buf, options)); |
| if (buf.match(/^\s*ssh-[a-z]/)) |
| return (ssh.read(buf, options)); |
| if (buf.match(/^\s*ecdsa-/)) |
| return (ssh.read(buf, options)); |
| buf = new Buffer(buf, 'binary'); |
| } else { |
| assert.buffer(buf); |
| if (findPEMHeader(buf)) |
| return (pem.read(buf, options)); |
| if (findSSHHeader(buf)) |
| return (ssh.read(buf, options)); |
| } |
| if (buf.readUInt32BE(0) < buf.length) |
| return (rfc4253.read(buf, options)); |
| throw (new Error('Failed to auto-detect format of key')); |
| } |
| |
| function findSSHHeader(buf) { |
| var offset = 0; |
| while (offset < buf.length && |
| (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9)) |
| ++offset; |
| if (offset + 4 <= buf.length && |
| buf.slice(offset, offset + 4).toString('ascii') === 'ssh-') |
| return (true); |
| if (offset + 6 <= buf.length && |
| buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-') |
| return (true); |
| return (false); |
| } |
| |
| function findPEMHeader(buf) { |
| var offset = 0; |
| while (offset < buf.length && |
| (buf[offset] === 32 || buf[offset] === 10)) |
| ++offset; |
| if (buf[offset] !== 45) |
| return (false); |
| while (offset < buf.length && |
| (buf[offset] === 45)) |
| ++offset; |
| while (offset < buf.length && |
| (buf[offset] === 32)) |
| ++offset; |
| if (offset + 5 > buf.length || |
| buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN') |
| return (false); |
| return (true); |
| } |
| |
| function write(key, options) { |
| throw (new Error('"auto" format cannot be used for writing')); |
| } |