74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
// Copyright 2015 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 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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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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buf = new Buffer(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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}
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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 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 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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