SSH Fingerprint in < 150 lines of VanillaJS, part of the Bluecrypt suite for Browser Crypto.

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README.md

Bluecrypt SSH Fingerprint (for Browsers)

A minimal library to read an SSH public key (id_rsa.pub) and generate its fingerprint.

Works for RSA and ECDSA public keys.

Features

< 150 lines of code | 1.1kb gzipped | 2.4kb minified | 4.1kb with comments

SSH Public Key SHA256 Fingerprints
- RSA (2048-bit, 3072-bit, 4096-bit)
- EC / ECDSA
  - P-256 (prime256v1, secp256r1)
  - P-384 (secp384r1)
Node.js version
- Greenlock SSH Fingerprint

Need SSH Private Keys?

SSH private keys (id_rsa) are just normal PEM files, so you can use Eckles or Rasha, as mentioned above.

Web Demo

https://coolaj86.com/demos/ssh-fingerprint/

git clone https://git.coolaj86.com/coolaj86/bluecrypt-ssh-fingerprint.js
pushd bluecrypt-ssh-fingerprint.js/

open index.html

Install

You can use it as a plain-old javascript library:

<script src="https://git.coolaj86.com/coolaj86/bluecrypt-ssh-fingerprint.js/raw/branch/master/ssh-fingerprint.js"></script>

It's also on npm:

npm install bluecrypt-ssh-fingerprint

Usage

Very simple:

var pub = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCba21UHE+VbDTpmYYFZUOV+OQ8AngOCdjROsPC0KiEfMvEaEM3NQl58u6QL7G7QsErKViiNPm9OTFo6HF5JijfWzK7haHFuRMEsgI4VwIYyhvqlJDfw/wt0AiVvSmoMfEQn1p1aiaO4V/RJSE3Vw/uz2bxiT22uSkSqOyShyfYE6dMHnuoBkzr4jvSifT+INmbv6Nyo4+AAMCZtYeHLrsFeSTjLL9jMPjI4ZkVdlw2n3Xn9NbltF3/8Ao8dQfElqw+LIQWqU0oFHYNIP4ttfl5ObMKHaKSvBMyNruZR0El/ZsrcHLkAHRCLj07KRQJ81l5CUTPtQ02P1Eamz/nT4I3 rsa@localhost';

SSH.fingerprint({ pub: pub }).then(function (fing) {
  console.info('The key fingerprint is:');
  console.info(fing.fingerprint);
});

Other Tools in the Bluecrypt Suite

Legal

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Bluecrypt™ is owned by AJ ONeal