@micalevisk/ssh-keygen NPM

ssh-keygen

Generates a SSH key-pair.

Install

Make sure you have ssh-keygen (try $ ssh-keygen if you aren't sure)
Run npm install @micalevisk/ssh-keygen if you're using NPM

Usage

TIP: If you set a non-empty string to the env. var. VERBOSE, you'll enable the verbose mode.

// With CommonJS
const path = require('path');
const fs = require('fs');
const keygen = require('@micalevisk/ssh-keygen');

keygen(
  {
    location: path.join(__dirname, 'foo_rsa'),
    read: true,
    force: true,
    destroy: false,
    comment: 'joe@foobar.com',
    password: 'keypassword',
    size: '2048',
    format: 'PEM',
  },
  // If you omit this callback function, a Promise will be returned instead!
  function onDoneCallback(err, out) {
    // The error could be related to ssh-keygen binary or file system errors.
    if (err) return console.error('Something went wrong:', err);
    console.log('Keys created!');
    console.log('private key:', out.key);
    console.log('public key:', out.pubKey);
  },
);

Read about the expected types here.

Parameters

location: desired location for the key. The public key will be at the location + .pub. Defaults to a file called id_rsa inside a temporary directory
read: should the callback have the key files read into it. Defaults to true
force: destroy pre-existing files with the location name and the public key name. Defaults to true
destroy: destroy the key files once they have been read. Defaults to false
comment: the comment that should be embedded into the key. Defaults to an empty string
password: the password for the key. Falsy values will turn this into an empty string. Defaults to an empty string
size: Specifies the number of bits (as string) in the key to create. Defaults to '2048'
format: Specify a key format for key generation. Defaults to 'RFC4716'

Promise-based API

NOTE: You'll need NodeJS version 8 or later because it's rely on util.promisify utility.

If you don't supply the second parameter to keygen (ie., the callback), then it will return a Promise that resolves to an plain object with key and pubkey properties.

How it works

The following shell command will get executed:

$ ssh-keygen -t rsa -b 2048 -C "joe@foobar.com" -N "keypassword" -m PEM -f ./foo_rsa
Generating public/private rsa key pair.
Your identification has been saved in ./foo_rsa.
Your public key has been saved in ./foo_rsa.pub.
The key fingerprint is:
02:f7:40:b6:c7:b3:a3:68:16:53:dd:86:63:df:b5:33 joe@foobar.com
The key's randomart image is:
+--[ RSA 2048]----+
|      o          |
|     o + o       |
|    . = O o   .  |
|     + = * . . . |
|    o . S . . E  |
|     + o .     o |
|    + .          |
|   o             |
|                 |
+-----------------+