JWK to SSH (for node.js)

A minimal library to encode a JWK as an SSH public key (id_rsa.pub).

Works for RSA and ECDSA public keys.

Features

< 75 lines of code | < 0.7kb gzipped | 1.5kb minified | 2.1kb with comments

• [x] SSH Public Keys
• [x] OpenSSH Private Keys
• [x] RSA Keys
• [x] EC Keys
  • P-256 (prime256v1, secp256r1)
  • P-384 (secp384r1)
• [x] Browser Version
  • Bluecrypt JWK to SSH

Note: the file size stats are for v1.0 which did not include private key packing. I plan to go back and update the stats, but just know that it grew a little over 2x.

Need JWK to SSH? PEM to SSH?

Try one of these:

• jwk-to-ssh.js (RSA + EC)
• Eckles.js (more EC utils)
• Rasha.js (more RSA utils)

Need Alternate SSH Private Keys?

This library supports OpenSSH private keys.

• [x] OpenSSH
• [ ] Normal PKCS1 / SEC1 / PKCS8
  • [x] Rasha.js
  • [x] Eckles.js
• [ ] Putty

Library Usage

You can also use it from JavaScript:

var fs = require('fs');
var jwktossh = require('jwk-to-ssh');

var jwk = JSON.parse(fs.readFileSync("./privkey.jwk.json"));
var pub = jwktossh.pack({
  jwk: jwk
, comment: 'root@localhost'
, public: true
});

console.info(pub);

CLI Usage

You can install jwk-to-ssh and use it from command line:

npm install -g jwk-to-ssh

jwk-to-ssh [keyfile] [comment] [public]

jwk-to-ssh pubkey.jwk.json

jwk-to-ssh privkey.jwk.json root@localhost

jwk-to-ssh privkey.jwk.json root@localhost public

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