// Copyright 2018 Joyent, Inc.
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module.exports = {
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read: read,
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write: write
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};
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var assert = require('assert-plus');
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var Buffer = require('safer-buffer').Buffer;
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var utils = require('../utils');
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var Key = require('../key');
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var PrivateKey = require('../private-key');
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var pem = require('./pem');
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var ssh = require('./ssh');
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var rfc4253 = require('./rfc4253');
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var dnssec = require('./dnssec');
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var putty = require('./putty');
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var DNSSEC_PRIVKEY_HEADER_PREFIX = 'Private-key-format: v1';
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function read(buf, options) {
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if (typeof (buf) === 'string') {
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if (buf.trim().match(/^[-]+[ ]*BEGIN/))
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return (pem.read(buf, options));
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if (buf.match(/^\s*ssh-[a-z]/))
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return (ssh.read(buf, options));
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if (buf.match(/^\s*ecdsa-/))
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return (ssh.read(buf, options));
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if (buf.match(/^putty-user-key-file-2:/i))
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return (putty.read(buf, options));
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if (findDNSSECHeader(buf))
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return (dnssec.read(buf, options));
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buf = Buffer.from(buf, 'binary');
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} else {
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assert.buffer(buf);
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if (findPEMHeader(buf))
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return (pem.read(buf, options));
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if (findSSHHeader(buf))
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return (ssh.read(buf, options));
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if (findPuTTYHeader(buf))
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return (putty.read(buf, options));
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if (findDNSSECHeader(buf))
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return (dnssec.read(buf, options));
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}
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if (buf.readUInt32BE(0) < buf.length)
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return (rfc4253.read(buf, options));
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throw (new Error('Failed to auto-detect format of key'));
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}
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function findPuTTYHeader(buf) {
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var offset = 0;
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while (offset < buf.length &&
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(buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))
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++offset;
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if (offset + 22 <= buf.length &&
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buf.slice(offset, offset + 22).toString('ascii').toLowerCase() ===
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'putty-user-key-file-2:')
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return (true);
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return (false);
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}
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function findSSHHeader(buf) {
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var offset = 0;
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while (offset < buf.length &&
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(buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))
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++offset;
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if (offset + 4 <= buf.length &&
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buf.slice(offset, offset + 4).toString('ascii') === 'ssh-')
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return (true);
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if (offset + 6 <= buf.length &&
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buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-')
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return (true);
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return (false);
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}
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function findPEMHeader(buf) {
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var offset = 0;
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while (offset < buf.length &&
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(buf[offset] === 32 || buf[offset] === 10))
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++offset;
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if (buf[offset] !== 45)
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return (false);
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while (offset < buf.length &&
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(buf[offset] === 45))
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++offset;
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while (offset < buf.length &&
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(buf[offset] === 32))
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++offset;
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if (offset + 5 > buf.length ||
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buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN')
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return (false);
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return (true);
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}
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function findDNSSECHeader(buf) {
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// private case first
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if (buf.length <= DNSSEC_PRIVKEY_HEADER_PREFIX.length)
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return (false);
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var headerCheck = buf.slice(0, DNSSEC_PRIVKEY_HEADER_PREFIX.length);
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if (headerCheck.toString('ascii') === DNSSEC_PRIVKEY_HEADER_PREFIX)
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return (true);
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// public-key RFC3110 ?
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// 'domain.com. IN KEY ...' or 'domain.com. IN DNSKEY ...'
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// skip any comment-lines
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if (typeof (buf) !== 'string') {
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buf = buf.toString('ascii');
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}
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var lines = buf.split('\n');
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var line = 0;
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/* JSSTYLED */
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while (lines[line].match(/^\;/))
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line++;
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if (lines[line].toString('ascii').match(/\. IN KEY /))
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return (true);
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if (lines[line].toString('ascii').match(/\. IN DNSKEY /))
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return (true);
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return (false);
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}
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function write(key, options) {
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throw (new Error('"auto" format cannot be used for writing'));
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}
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