Current File : //lib/node_modules/npm/node_modules/sshpk/lib/formats/ssh.js
// Copyright 2015 Joyent, Inc.
module.exports = {
read: read,
write: write
};
var assert = require('assert-plus');
var Buffer = require('safer-buffer').Buffer;
var rfc4253 = require('./rfc4253');
var utils = require('../utils');
var Key = require('../key');
var PrivateKey = require('../private-key');
var sshpriv = require('./ssh-private');
/*JSSTYLED*/
var SSHKEY_RE = /^([a-z0-9-]+)[ \t]+([a-zA-Z0-9+\/]+[=]*)([ \t]+([^ \t][^\n]*[\n]*)?)?$/;
/*JSSTYLED*/
var SSHKEY_RE2 = /^([a-z0-9-]+)[ \t\n]+([a-zA-Z0-9+\/][a-zA-Z0-9+\/ \t\n=]*)([^a-zA-Z0-9+\/ \t\n=].*)?$/;
function read(buf, options) {
if (typeof (buf) !== 'string') {
assert.buffer(buf, 'buf');
buf = buf.toString('ascii');
}
var trimmed = buf.trim().replace(/[\\\r]/g, '');
var m = trimmed.match(SSHKEY_RE);
if (!m)
m = trimmed.match(SSHKEY_RE2);
assert.ok(m, 'key must match regex');
var type = rfc4253.algToKeyType(m[1]);
var kbuf = Buffer.from(m[2], 'base64');
/*
* This is a bit tricky. If we managed to parse the key and locate the
* key comment with the regex, then do a non-partial read and assert
* that we have consumed all bytes. If we couldn't locate the key
* comment, though, there may be whitespace shenanigans going on that
* have conjoined the comment to the rest of the key. We do a partial
* read in this case to try to make the best out of a sorry situation.
*/
var key;
var ret = {};
if (m[4]) {
try {
key = rfc4253.read(kbuf);
} catch (e) {
m = trimmed.match(SSHKEY_RE2);
assert.ok(m, 'key must match regex');
kbuf = Buffer.from(m[2], 'base64');
key = rfc4253.readInternal(ret, 'public', kbuf);
}
} else {
key = rfc4253.readInternal(ret, 'public', kbuf);
}
assert.strictEqual(type, key.type);
if (m[4] && m[4].length > 0) {
key.comment = m[4];
} else if (ret.consumed) {
/*
* Now the magic: trying to recover the key comment when it's
* gotten conjoined to the key or otherwise shenanigan'd.
*
* Work out how much base64 we used, then drop all non-base64
* chars from the beginning up to this point in the the string.
* Then offset in this and try to make up for missing = chars.
*/
var data = m[2] + (m[3] ? m[3] : '');
var realOffset = Math.ceil(ret.consumed / 3) * 4;
data = data.slice(0, realOffset - 2). /*JSSTYLED*/
replace(/[^a-zA-Z0-9+\/=]/g, '') +
data.slice(realOffset - 2);
var padding = ret.consumed % 3;
if (padding > 0 &&
data.slice(realOffset - 1, realOffset) !== '=')
realOffset--;
while (data.slice(realOffset, realOffset + 1) === '=')
realOffset++;
/* Finally, grab what we think is the comment & clean it up. */
var trailer = data.slice(realOffset);
trailer = trailer.replace(/[\r\n]/g, ' ').
replace(/^\s+/, '');
if (trailer.match(/^[a-zA-Z0-9]/))
key.comment = trailer;
}
return (key);
}
function write(key, options) {
assert.object(key);
if (!Key.isKey(key))
throw (new Error('Must be a public key'));
var parts = [];
var alg = rfc4253.keyTypeToAlg(key);
parts.push(alg);
var buf = rfc4253.write(key);
parts.push(buf.toString('base64'));
if (key.comment)
parts.push(key.comment);
return (Buffer.from(parts.join(' ')));
}
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