v1.0.0: pack EC and RSA ssh public keys
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README.md
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README.md
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# Bluecrypt JWK to SSH (for Browsers)
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A minimal library to parse an SSH public key (`id_rsa.pub`)
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and convert it into a public JWK using Vanilla JS.
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Works for RSA and ECDSA public keys.
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# Features
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< 100 lines of code | < 1.0kb gzipped | 2.0kb minified | 2.9kb with comments
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* [x] SSH Public Keys
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* [x] RSA Public Keys
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* [x] EC Public Keys
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* P-256 (prime256v1, secp256r1)
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* P-384 (secp384r1)
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* [x] node.js version
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* [jwk-to-ssh.js](https://git.coolaj86.com/coolaj86/jwk-to-ssh.js)
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* [x] on npm as [bluecrypt-jwk-to-ssh](https://www.npmjs.com/package/bluecrypt-jwk-to-ssh)
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### Need SSH Private Keys?
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SSH private keys (`id_rsa`) are just normal PEM files.
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# Web Demo
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<https://coolaj86.com/demos/jwk-to-ssh/>
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<img border="1" src="https://i.imgur.com/LY3JGPY.png" />
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```bash
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git clone https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js
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pushd bluecrypt-jwk-to-ssh.js/
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```
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```bash
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open index.html
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```
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# Install
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You can use it as a plain-old javascript library:
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```html
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<script src="https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js/raw/branch/master/jwk-to-ssh.js"></script>
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```
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It's also on npm:
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```bash
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npm install bluecrypt-jwk-to-ssh
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```
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# Usage
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Very simple:
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```js
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var pub = 'ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBCE9Uli8bGnD4hOWdeo5KKQJ/P/vOazI4MgqJK54w37emP2JwOAOdMmXuwpxbKng3KZz27mz+nKWIlXJ3rzSGMo= root@localhost';
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var ssh = SSH.parse(pub);
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console.info(ssh.jwk);
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```
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# Other Tools in the Bluecrypt Suite
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* [Bluecrypt JWK to SSH](https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js) (RSA, EC, SSH)
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* [Bluecrypt ASN.1 decoder](https://git.coolaj86.com/coolaj86/asn1-parser.js) (x509, RSA, EC, etc)
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* [Bluecrypt ASN.1 builder](https://git.coolaj86.com/coolaj86/asn1-packer.js) (x509, RSA, EC, etc)
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# Legal
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[jwk-to-ssh.js](https://git.coolaj86.com/coolaj86/jwk-to-ssh.js) |
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MPL-2.0 |
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[Terms of Use](https://therootcompany.com/legal/#terms) |
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[Privacy Policy](https://therootcompany.com/legal/#privacy)
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Bluecrypt™ is owned by AJ ONeal
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index.html
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index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>SSH Pub Generator - Bluecrypt</title>
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<style>
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textarea {
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width: 42em;
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height: 10em;
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}
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pre {
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white-space: pre-wrap;
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}
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.code {
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width: 29em;
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word-wrap: break-word;
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}
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</style>
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</head>
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<body>
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<h1>Bluecrypt SSH Public Key Generator</h1>
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<textarea class="js-input" placeholder="Paste a PEM here">{
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"kty": "EC",
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"crv": "P-256",
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"x": "IT1SWLxsacPiE5Z16jkopAn8_-85rMjgyCokrnjDft4",
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"y": "mP2JwOAOdMmXuwpxbKng3KZz27mz-nKWIlXJ3rzSGMo"
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}</textarea>
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<br>
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<input type="text" class="js-comment" placeholder="SSH comment (i.e. root@localhost" value="root@localhost">
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<!-- pre><code class="js-hex"> </code></pre -->
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<div class="code"><pre><code class="js-pub"> </code></pre></div>
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<br>
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<p>Made with <a href="https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js/">jwk-to-ssh.js</a></p>
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<script src="./jwk-to-ssh.js"></script>
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<script>
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'use strict';
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var $input = document.querySelector('.js-input');
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function convert() {
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console.log('keyup');
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try {
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var text = document.querySelector('.js-input').value;
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var comment = document.querySelector('.js-comment').value;
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var jwk = JSON.parse(text);
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var pub = SSH.pack({ jwk: jwk, comment: comment });
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//document.querySelector('.js-hex').innerText = hex
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// .match(/.{2}/g).join(' ').match(/.{1,24}/g).join(' ').match(/.{1,50}/g).join('\n');
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document.querySelector('.js-pub').innerText = pub;
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} catch(e) {
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var msg = { error: { message: e.message } };
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document.querySelector('.js-pub').innerText = JSON.stringify(msg, null, 2);
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}
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}
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$input.addEventListener('keyup', convert);
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convert();
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</script>
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</body>
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</html>
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120
jwk-to-ssh.js
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jwk-to-ssh.js
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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;(function (exports) {
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'use strict';
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if (!exports.Enc) { exports.Enc = {}; }
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if (!exports.SSH) { exports.SSH = {}; }
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var Enc = exports.Enc;
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var SSH = exports.SSH;
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SSH.pack = function (opts) {
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var jwk = opts.jwk;
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var els = [];
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var ssh = {
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type: ''
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, _elements: els
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, comment: opts.comment || ''
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};
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var len;
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if ("RSA" === jwk.kty) {
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ssh.type = 'ssh-rsa';
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els.push(Enc.binToHex(ssh.type));
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els.push(SSH._padRsa(Enc.base64ToHex(jwk.e)));
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els.push(SSH._padRsa(Enc.base64ToHex(jwk.n)));
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return SSH._packElements(ssh);
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}
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if ("P-256" === jwk.crv) {
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ssh.type = 'ecdsa-sha2-nistp256';
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els.push(Enc.binToHex(ssh.type));
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els.push(Enc.binToHex('nistp256'));
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len = 32;
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} else if ("P-384" === jwk.crv) {
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ssh.type = 'ecdsa-sha2-nistp384';
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els.push(Enc.binToHex(ssh.type));
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els.push(Enc.binToHex('nistp384'));
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len = 48;
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} else {
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throw new Error("unknown key type " + (jwk.crv || jwk.kty));
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}
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els.push('04'
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+ SSH._padEc(Enc.base64ToHex(jwk.x), len)
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+ SSH._padEc(Enc.base64ToHex(jwk.y), len)
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);
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return SSH._packElements(ssh);
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};
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SSH._packElements = function (ssh) {
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var hex = ssh._elements.map(function (hex) {
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console.log(hex);
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return SSH._numToUint32Hex(hex.length/2) + hex;
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}).join('');
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return [ ssh.type, Enc.hexToBase64(hex), ssh.comment ].join(' ');
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};
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SSH._numToUint32Hex = function (num) {
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var hex = num.toString(16);
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while (hex.length < 8) {
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hex = '0' + hex;
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}
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console.log('length', hex);
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return hex;
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};
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SSH._padRsa = function (hex) {
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// BigInt is negative if the high order bit 0x80 is set,
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// so ASN1, SSH, and many other formats pad with '0x00'
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// to signifiy a positive number.
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var i = parseInt(hex.slice(0, 2), 16);
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if (0x80 & i) {
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return '00' + hex;
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}
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return hex;
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};
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SSH._padEc = function (hex, len) {
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while (hex.length < len * 2) {
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hex = '00' + hex;
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}
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return hex;
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};
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Enc.base64ToHex = function (b64) {
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var bin = atob(Enc.urlBase64ToBase64(b64));
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return Enc.binToHex(bin);
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};
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Enc.binToHex = function (bin) {
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return bin.split('').map(function (ch) {
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var h = ch.charCodeAt(0).toString(16);
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if (h.length % 2) { h = '0' + h; }
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return h;
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}).join('');
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};
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Enc.hexToBase64 = function (hex) {
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return btoa(Enc.hexToBin(hex));
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};
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Enc.hexToBin = function (hex) {
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return hex.match(/.{2}/g).map(function (h) {
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return String.fromCharCode(parseInt(h, 16));
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}).join('');
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};
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Enc.urlBase64ToBase64 = function urlsafeBase64ToBase64(str) {
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var r = str % 4;
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if (2 === r) {
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str += '==';
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} else if (3 === r) {
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str += '=';
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}
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return str.replace(/-/g, '+').replace(/_/g, '/');
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};
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}('undefined' !== typeof window ? window : module.exports));
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28
package.json
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package.json
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{
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"name": "bluecrypt-jwk-to-ssh",
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"version": "1.0.0",
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"description": "JWK to SSH in < 100 lines of VanillaJS.",
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"homepage": "https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js",
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"main": "jwk-to-ssh.js",
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"scripts": {
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"prepare": "uglifyjs jwk-to-ssh.js > jwk-to-ssh.min.js"
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},
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"directories": {
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"lib": "lib"
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},
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"repository": {
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"type": "git",
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"url": "https://git.coolaj86.com/coolaj86/bluecrypt-jwk-to-ssh.js"
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},
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"keywords": [
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"zero-dependency",
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"JWK-to-SSH",
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"RSA",
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"EC",
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"SSH",
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"JWK",
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"ECDSA"
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],
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"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
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"license": "MPL-2.0"
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}
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